WO2006008850A1 - 低耐熱性表面実装部品及びこれをバンプ接続した実装基板 - Google Patents
低耐熱性表面実装部品及びこれをバンプ接続した実装基板 Download PDFInfo
- Publication number
- WO2006008850A1 WO2006008850A1 PCT/JP2005/003277 JP2005003277W WO2006008850A1 WO 2006008850 A1 WO2006008850 A1 WO 2006008850A1 JP 2005003277 W JP2005003277 W JP 2005003277W WO 2006008850 A1 WO2006008850 A1 WO 2006008850A1
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- Prior art keywords
- solder
- bump
- low heat
- circuit board
- resistant surface
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/341—Surface mounted components
- H05K3/3431—Leadless components
- H05K3/3436—Leadless components having an array of bottom contacts, e.g. pad grid array or ball grid array components
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09372—Pads and lands
- H05K2201/094—Array of pads or lands differing from one another, e.g. in size, pitch, thickness; Using different connections on the pads
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/17—Post-manufacturing processes
- H05K2203/176—Removing, replacing or disconnecting component; Easily removable component
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/3457—Solder materials or compositions; Methods of application thereof
- H05K3/3463—Solder compositions in relation to features of the printed circuit board or the mounting process
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T428/24826—Spot bonds connect components
Definitions
- the present invention relates to a low heat-resistant surface-mount component that is mounted on a circuit board in a mixed manner using a Pb-free solder alloy with low toxicity, and a mounting board in which this is bump-connected.
- Pb-free solder alloys are applicable to the connection of electronic components to circuit boards such as organic substrates, and are Sn-37Pb (unit: mass%) solder used for soldering at around 220 ° C. It is an alternative.
- soldering method for an electronic product to a circuit board such as an organic substrate, hot air is blown onto the circuit board, and solder bumps printed on the electrodes are melted to solder the surface mounting components. (Reflow soldering process) to perform (bump connection) and flow soldering process to solder some surface mount components such as insertion mounting components and chip components by bringing a molten solder jet into contact with the circuit board It is configured.
- This soldering method is a mixed mounting method!
- Pb-free solder As a conventional technique related to a mounting method using powerful Pb-free solder, Sn-Ag-Bi solder or Sn-Ag-Bi-Cu solder alloy is known as Pb-free solder. (For example, see Patent Document 1).
- an electronic component is connected to the surface of the board by reflow soldering on the A side of the board, and then the lead of the electronic component inserted into the A side of the board on the B side of the board is an electrode.
- the solder used for reflow soldering on the A side is Sn— (1.5—3.5 wt%) Ag- (0.2—0.8 wt% ) Cu- (0— 4 wt%) In— (0— 2 wt%) Pb-free solder composed of Bi, and Sn— (0—3.5 wt%) ) Ag- (0.2-0.8wt%) Cu composition It is known that a Pb-free solder is formed (see, for example, Patent Document 2).
- solder bumps for soldering electronic components to the board are used. At the corners of these electronic components, Sn— (2—5wt%) Ag— (0—lwt) %) Cu- (0— lwt%) Using high melting point solder bumps (melting point temperature 220 ° C) with a component composition of Bi, Sn— (2—5 wt%) Ag— (0—lwt%) Uses low melting point solder bumps (melting point temperature 200 ° C) with a Cu- (5-15wt%) Bi component composition. The substrate is lower than the heat resistance temperature (230 ° C) of electronic components and has a high melting point.
- soldering bump connection
- a set reflow temperature that exceeds the melting temperature of the mold solder (approximately 220 ° C)
- the solder bumps are not delayed even inside electronic components with poor heat transfer
- a method of melting is proposed (see, for example, Patent Document 3).
- Patent Document 1 Japanese Patent Laid-Open No. 10-166178
- Patent Document 2 Japanese Patent Laid-Open No. 2001-168519
- Patent Document 3 Japanese Patent Laid-Open No. 2002-141652
- the surface mounting component is removed from the circuit board on which the low heat resistant surface mounting component is bump-connected, and the circuit board and the surface mounting component are reused.
- the circuit board and the surface mounting component are reused.
- solder bumps for connecting low heat-resistant surface mount components to circuit boards are made of high melting point Sn-3Ag-0.5Cu solder. Therefore, in order to remove such surface mount components from the circuit board, local heating is performed around the surface mount components, and solder bumps near the outer periphery of the surface mount components that are difficult to rise in temperature are melted. The temperature of the mounting part's knocking part may exceed the heat resistance temperature of the package part, causing problems such as deterioration or destruction of the performance of the surface mounting part.
- An object of the present invention is to solve a problem that is hard to solve and to reduce a low heat-resistant surface-mounted component soldered to a circuit board without affecting the performance of the circuit board or the low heat-resistant surface-mounted component. It is an object of the present invention to provide a low heat-resistant surface mounting component that can be removed and a mounting substrate that is bump-connected thereto.
- the present invention provides a low heat-resistant surface-mounted component that is bump-connected to a circuit board, and the melting point of the solder bump for bump connection has a low heat-resistant surface-mounted product.
- the heat resistance is lower than the center of the bump forming surface of the low heat resistant surface mount product and lower at the outer periphery.
- the present invention provides a mounting board in which a low heat resistant surface mounting board is bump-connected to a circuit board, and solder bumps for bump connection are low heat resistant surface mounting. Soldering force with a melting point below the heat resistance temperature of the product, and solder bumps closer to the outer periphery than the solder bumps near the center of the solder bump formation surface of the low heat resistance surface mount product, have a lower melting point.
- the above circuit board is provided with a solder paste, and the low heat-resistant surface mount board is bump-connected to the circuit board by fusion of the solder paste and the solder bump.
- Solder bumps and solder pastes are Sn-Ag-Cu-In, Sn-Ag-Bi, Sn-Ag-Bi-Cu, Sn-Ag-Cu-In-Bi, Sn -Soldering force of either Zn or Sn-Zn-Bi.
- solder bump and the solder paste are Sn-Ag-Cu with an In content of 0-9% by mass. -In-based soldering force is formed.
- solder bump and solder paste near the outer periphery of the solder bump formation surface of the low heat-resistant surface-mount substrate have an In content of 7-9 mass% in Sn-Ag-Cu-In solder. It is a power.
- the solder bump is melted over the entire surface, and the circuit board of the low heat resistant surface mount component is removed. Is removed smoothly.
- FIG. 1 (a) is a plan view showing a main part of an embodiment of a low heat resistant surface mount component according to the present invention, and 1 is a low surface mount component including the low heat resistant component of this embodiment.
- Heat-resistant surface mount parts, la is package, 2 is corner, 3 is solder bump.
- FIG. 1 (a) shows a specific example of a package la as a low heat resistant surface mount component 1 including a low heat resistant component and mounted (bumped) on a circuit board (not shown).
- the ball-shaped solder bumps 3 are provided in the periphery of the surface of the package la (the surface on which the solder bumps 3 are provided is hereinafter referred to as bump formation). Called the surface).
- solder bump 3 provided in the peripheral portion is referred to as a peripheral bump.
- BGA Ball Grid Array
- BGA Ball Grid Array
- bump 3 was provided on the periphery of the bump forming surface.
- BGA is a peripheral bump arrangement type BGA!
- Fig. 1 (b) shows another specific example of the package la as the low heat-resistant surface-mounting component 1.
- the ball-shaped solder bumps 3 form the bumps of the package la. It is provided on the entire surface.
- the solder bumps 3 arranged in this way are referred to as full grid bumps, and the surface mount component on which the solder bumps 3 are arranged in this manner is referred to as a full grip type. Therefore, a BGA provided with such a full grid bump 3 is called a full grid type BGA.
- the bump 3 near the outer periphery on the bump forming surface of the package la as shown in FIGS. 1 (a) and 1 (b) is lower than the solder bump 3 at other locations.
- solder for forming the solder bump 3 will be described.
- solder containing a large amount of Bi means that the solder applied to the component electrodes in advance in order to improve the wettability of the solder to the electrodes (component electrodes) of the mounted components.
- Pb is contained in Pb
- the Pb in the solder and Bi in the solder create a low melting eutectic phase, which is the thermal effect of other soldering such as insertion mounting parts after reflow soldering. It is known that segregation of components may cause segregation and breakage of the connection.
- a Bi content or a solder containing Bi is applied.
- the types of circuit boards that can be made are greatly limited.
- solder bump provided on the surface mount component is provided.
- a solder with a high melting point such as Sn-3Ag-0.5Cu (liquidus temperature: 220 ° C)
- melting started in the middle of reflow soldering, and the solder paste contacts the solder bumps
- the solder paste fuses with the solder bumps, and the melting point of the solder paste rises close to the melting point of Sn-3Ag-0.5Cu, which is a solder bump, resulting in poor melting.
- the In content of the solder bump on the surface mount component side should not exceed the In content on the solder paste side in order to prevent a decrease in connection reliability. It is necessary to select an appropriate content.
- solder bumps on the surface-mounted component side are the same as the solder paste Sn-Ag-Cu-I
- the surface mount component is removed from the mount board and the circuit board is re-mounted.
- a peripheral bump arrangement type BGA1 heat resistant temperature: 220 ° C, component size: low heat resistant surface mount component as shown in Fig. 1 (a). 3 Omm X 30 mm, bump pitch: 1. 27 mm, number of bumps: 256) force Solder bump (bump) on a circuit board (not shown) with solder bump 3 and solder paste (supply thickness: 0.15 mm) not shown
- the connected mounting board is the target.
- the solder bump and the solder paste on the mounting substrate are formed from Sn-Ag-Cu-In solder, and the content of In is the solder paste. And the solder bump and 0-9 mass%, and the In content in the solder bump is smaller than the In content in the solder paste. That is, in FIG. 1 (a), the solder bump 31 ⁇ content at the corner 2) is 7-9% by mass, and the melting point is lower than that of the solder bump 3 at other locations.
- the solder bumps on the peripheral bump arrangement type BGA1 side and the solder paste on the circuit board side are completely fused.
- the solder paste is not completely melted but connected to the solder bumps! RU
- the peripheral bump arrangement type BGA1 is connected to the circuit board by a reflow soldering apparatus, and this reflow soldering apparatus has a heating zone (a pair of heaters existing above and below the board transfer conveyor) having infrared rays.
- the number of heating zones is 10 and the soldering atmosphere is nitrogen and the oxygen concentration is lOOppm.
- FIG. 2 shows a specific example of a component removal apparatus for removing a surface mount component from a substrate.
- 4 is a circuit board
- 5 is a component removing device
- 6 is a mounting table
- 7 is a local calorie heat nozzle
- 8 is a heating nozzle.
- FIG. 3 is an exploded perspective view showing the configuration of the mounting table 6 in the component removing device 5 shown in FIG. 2, wherein 6a is an opening, 6b is an infrared lamp, 6c is a fixture, 6d is a support table, 6e is a fixture, and 6f is a support pin.
- 6a is an opening
- 6b is an infrared lamp
- 6c is a fixture
- 6d is a support table
- 6e is a fixture
- 6f is a support pin.
- the mounting table 6 has, for example, a horizontally long rectangular shape, and penetrates from the upper surface to the lower surface of the mounting table 6 at the center, for example, the cross-sectional shape is square or circular.
- An opening 6a is provided.
- the tip of the heating nozzle 8 is fitted into the opening 6a.
- a predetermined number of infrared lamps 6b are provided in the mounting table 6 except for the opening 6a. These infrared lamps 6b may be exposed on the upper side thereof, or may be covered with the upper surface of the mounting table 6 that transmits infrared rays.
- the support base 6d is fixed to the mounting bracket 6c, and the mounting base 6d is attached to the mounting base 6 by the mounting base 6c so that the longitudinal direction thereof is the width direction of the mounting base 6. .
- Two support bases 6d each having a mounting bracket 6c are used, and are attached to the mounting base 6 so as to be symmetrical with respect to the force opening 6a (see FIG. 2).
- two support pins 6f are fixed to the mounting bracket 6e. With this mounting bracket 6e, the two support pins 6f have their longitudinal directions aligned with the width direction of the mounting table 6, that is, this The two mounting pins 6f fixed to the same mounting bracket 6e are attached to the mounting table 6 so that they are arranged in the width direction of the mounting table 6.
- each mounting table 6e is positioned symmetrically with respect to the opening 6a between the two support bases 6d (see Fig. 2). Attached to.
- the support 6d has an adsorption Means are provided.
- the circuit board 4 shown in FIG. 2 is supported by the two support bases 6d and the four support pins 6f such that the peripheral bump arrangement type BGA1 faces the opening 6a. At this time, the circuit board 4 is fixed and held by the suction means provided on the support base 6d.
- FIG. 4 is a perspective view showing the structure of the tip of the local heating nozzle 7 in FIG. 2, wherein 7a is a blowout port, 7b is a suction nozzle, 7c is a suction plate, and 7e is a suction port.
- the tip of the local heating nozzle 7 is provided with a suction nozzle 7b at the center and a plurality of (in this case, four) hot air outlets 7a around the suction nozzle 7b.
- the suction plate 7c is made of rubber or the like and is fitted into the suction nozzle 7b.
- a suction port 7d is provided at the center of the suction plate 7c.
- the local heating nozzle 7 can be moved in the directions of arrows A and B (width direction of the mounting table 6), and when the circuit board 4 is mounted on the mounting table 6, the arrow It is moving in the A direction and placed at a position off the mounting table 6.
- the suction means of the support base 6d is activated, and the circuit board 4 is attracted and fixed to the support base 6d.
- the local heating nozzle 7 moves in the arrow B direction opposite to the arrow A, and faces the peripheral bump arrangement type BGA1 on the circuit board 4 and is close to the peripheral bump arrangement type BGA1.
- the blowing port 7a of the local heating nozzle 7 (Fig. 4) force hot air is blown from the upper side to the peripheral bump arrangement type BGA1, and hot air is blown from the heating nozzle 8. Sprayed onto the lower surface of the circuit board 4.
- the solder that fixes the peripheral bump arrangement type BGA 1 to the circuit board 4 is heated and melted.
- peripheral bump placement type BGA1 When the peripheral bump placement type BGA1 is ready to be removed from the circuit board 4 after heating for a predetermined time, suction force acts on the peripheral bump placement type BGA1 by the suction nozzle 7b (Fig. 4) of the local heating nozzle 7. Detached from the circuit board 4 and sucked and held by the sucking board 7c attached to the sucking bow I nozzle 7b.
- the circuit board 4 has the most severe connection conditions on the circuit board.
- ⁇ ⁇ ⁇ 56 lead TSOP Thin Small Outline Package
- Sn-3Ag-0.5Cu-71 ⁇ solder is used as the solder paste, and the In content ensures a temperature cycle life of 1000 cycles at TSOP-55-125 ° C.
- the maximum amount possible is 7% by mass.
- solder content of the solder paste is such that the In content in the solder paste does not exceed the In content and the bump formation surface of the peripheral bump arrangement type BGA1 is closer to the outer periphery.
- Increase the In content of Ag-Cu-In solder if the In content exceeds 7-9 mass%, In itself causes the low-melting-point eutectic phase described above. The In content is sufficient to obtain the predetermined melting point.
- the center of the peripheral bump arrangement type BGA1 is the vicinity of the outer periphery using the solder bump having a melting point lower than that of the solder bump used in the central part of the peripheral bump arrangement type BGA1.
- the area is outside the circumference of radius R centered at point 0.
- the radius R for example, when the circuit board 4 is heated by the local heating nozzle 7, the heating nozzle 8 and the infrared lamp 6b in the component removing device 5 shown in FIGS. Decide according to the temperature distribution.
- the area inside the circumference of the radius R is equal to or higher than the melting point of the solder pump, and the heat resistance temperature of the peripheral bump arrangement type BGA1 (in the above example, 2
- the heat resistance temperature of the peripheral bump arrangement type BGA1 in the above example, 2
- the area outside the circumference of the radius R on the bump formation surface of the peripheral bump arrangement type BGA1 that is, near the outer periphery
- the solder bump 3 that has a melting point of Sn-Ag-Cu-In that has a melting point below this low heating temperature is also provided near the outer periphery.
- the region near the outer periphery is represented as a corner portion 2.
- FIG. 1 When the region near the outer periphery is set, and the solder valve 3 is formed of solder having a melting point lower than that of the solder bump 3 closer to the center in the region near the outer periphery, FIG.
- the center point 0 of the bump formation surface of this peripheral bump placement type BGA1 is the center of the local heating nose 7 (ie, suction)
- a mounting board in which the peripheral bump arrangement type BGA 1 is bump-connected to the circuit board 4 is placed on the mounting table 6 so as to face the nozzle 7b).
- FIG. 5 (b) three regions are arranged around the center point 0 of the peripheral bump arrangement type BGA1 with different radii Rl and R2 (where R1> R2). It is also possible to divide and form solder bumps 3 of these areas closer to the outer periphery with solder having a lower melting point. That is, the melting point of the solder bump inside the circumference of the radius R2 is Ta, the melting point of the solder bump in the area between the circumferences of the radii Rl and R2 is Tb, and the solder bump of the area outside the circumference of the radius Rl is When the melting point is Tc, Ta> Tb> Tc.
- this area may be set to 3 or more, and the melting point of the solder valve may gradually decrease as it approaches the outer periphery, and the central point force of the peripheral bump arrangement type BGA1 that is not divided as an area is also separated. Accordingly, the melting point of the solder valve 3 may be gradually lowered.
- thermocouple was installed to measure the temperature at the center and corner of the bump formation surface of this peripheral bump placement type BGA1.
- the peripheral bulb-arranged BGA 1 is heated by the local heating nozzle 7 and the heating nozzle 8, and the circuit board 4 is heated by the infrared lamp 6b.
- the peak temperature at the center of the bump formation surface of the peripheral valve placement type BGA 1 was 205 ° C.
- peripheral valve arrangement type BGA1 As described above, with respect to the mounting board in which the peripheral valve arrangement type BGA1 is bump-connected to the circuit board 4, the solder bumps at the center and the outer periphery of the bump formation surface of the peripheral valve arrangement type BGA1
- the peripheral valve arrangement type BGA1 as a whole is formed by soldering with a melting point (ie, the above In content) corresponding to the heating temperature near the outer periphery when the solder bump is heated to a temperature that can melt the solder bumps near the center.
- a melting point ie, the above In content
- the circuit board 4 force peripheral valve arrangement type BGA1 can be easily removed, but the circuit without affecting the performance of the circuit board 4 or peripheral valve arrangement type BGA1.
- Peripheral valve arrangement type BGA1 can be removed from board 4.
- a full grip type BGA with solder bumps provided on the entire surface of the BGA (for example, metathermal temperature: 220 ° C, component size: 23mmX23mm, bump pitch: 1. Omm, number of bumps: 484, supply thickness: 0.15mm bumped to circuit board with solder paste This is the same for the case of the thing).
- solder bumps for low heat-resistant surface mount components This Sn-3Ag-0.5Cu solder is used.
- the entire circuit board is heated by blowing hot air to connect the low heat resistant surface mount component to the circuit board.
- the temperature near the center of the low heat-resistant surface mount component between the low heat resistant surface mount component and the circuit board is difficult to reach when hot air is difficult to reach. For this reason, if the solder bump near the center is melted, the temperature of the low-heat-resistant surface-mount component's knocker part will exceed the heat-resistant temperature, which will adversely affect the performance of the knocker part.
- the solder bump closer to the center is formed with the solder having a low melting point than the solder bump closer to the outer periphery on the surface where the solder bump is provided.
- the solder bump near the center of the low-heat-resistant surface mount component, where the temperature does not rise easily when the entire circuit board is heated also melts. Make it easy to do.
- the conventional Sn-3Ag-0 is used as a solder for reflow in the reflow soldering process in which solder paste is used to solder low thermal surface mount components including low heat resistant components that perform bump connection.
- the connection reliability with a lower melting point than the composition of 5Cu is not significantly lower than when Sn-3Ag-0.5Cu is used.
- V Sn-Ag- Cu-In solder (liquidus temperature: about 210 ° C) is often used.
- the melting point is low, and Sn-Ag-Bi, Sn-Ag-Bi-Cu, Sn-Ag-Cu-In-Bi, The use of Sn-Zn and Sn-Zn-Bi can also be considered.
- solder containing a large amount of Zn is used, the wettability of the surface-mounted component to the electrode is generally poor. Therefore, the effect of lowering the soldering temperature while ensuring sufficient wettability is achieved. Similarly, when producing fruits, the types of circuit boards to which Zn content and Zn-containing solder can be applied are severely restricted.
- solder bumps of the surface mount parts are made of solder with a high melting point, such as Sn-3Ag-0.5Cu (liquidus temperature: 220 ° C), the solder that started melting during reflow soldering This is probably because the paste was in contact with the solder bumps and fused with the solder paste at the part, and the melting point became close to Sn-3Ag-0.5Cu.
- solder bumps on the surface-mounted component side be Sn-Ag-Cu-In based on the same system as the solder paste on the circuit board side.
- the In content in a solder paste made of Sn-Ag-Cu-In solder exceeds 7-9 mass%, In itself may cause the low melting point eutectic phase.
- the In content is preferably 7-9% by mass.
- the In content of the solder bump on the low heat-resistant ice-mounted component side should not exceed the In content of the solder paste in order to prevent the connection reliability from falling. It is necessary to select and use the appropriate content.
- FIG. 7 is a plan view showing a specific example of a package of a low heat-resistant surface-mounting component that is powerful.
- FIG. 7 (a) shows a peripheral bump arrangement type BGA
- FIG. 7 (b) shows a full grid type BGA.
- Each showing and illustration Parts corresponding to 1 are given the same reference numerals. However, 2a is near the outer periphery, 2b is near the center, and 8 is the boundary between the outer periphery 2a and the center 2b.
- a position at a certain distance from the outer side of BGA1 is defined as boundary 8, and the outside of this boundary is defined as 2a on the outer periphery and 2b on the inside as the center.
- the solder bump 3 near the center 2b is made of solder having a lower melting point than the solder bump 3 near the outer periphery 2a.
- solder bump 3 in the embodiment shown in FIG. 1 is explained and there is an overlapping part, but the solder bump 3 will be explained.
- solder containing a large amount of Bi means that the soldering applied to the component electrode in advance in order to improve the wettability of the solder to the electrode (component electrode) of the mounted component.
- Pb is contained in Pb
- the Pb in the solder and Bi in the solder create a low melting eutectic phase, which is the thermal effect of other soldering such as insertion mounting parts after reflow soldering. It is known that segregation of components may cause segregation and breakage of the connection.
- a Bi content or a solder containing Bi is applied.
- the types of circuit boards that can be made are greatly limited.
- Sn-Ag-Cu-In solder is often used for paste-in soldering when low-temperature soldering is required to protect low-heat-resistant surface-mount components. It is desirable to use with hesitation.
- solder bump provided on the surface mount component
- a high melting point solder such as Sn-3Ag-0.5Cu (liquidus temperature: 220 ° C)
- the solder paste starts to melt during reflow soldering, and the solder paste comes into contact with the solder bumps.
- the solder paste fuses with the solder bumps, and the melting point of the solder paste approaches the melting point of Sn-3Ag-0.5Cu, which is a solder bump, resulting in poor melting.
- solder bumps on the surface-mounted component side close to the same Sn-Ag-Cu-In solder thread as the solder paste, the solder paste and the solder bumps are fused.
- An increase in melting point that is, poor melting of the solder paste can be suppressed.
- it is desirable that the In content of the solder bumps on the surface mount component side should not exceed the In content on the solder paste side in order to prevent a decrease in connection reliability. It is necessary to select the content.
- the solder bump near the center of the surface-mounted component surface has a larger In content than the solder bump near the outer periphery (ie, the In content is brought closer to 7-9 mass%).
- Surface mount components are soldered to the circuit board by forming with low melting point solder (bump connection) Therefore, when the circuit board is heated, the solder bumps near the center of the surface-mount components that do not easily rise in temperature tend to melt, and the solder bumps and solder paste fuse together to obtain a good bump connection. It will be.
- a full grid type BGA as shown in Fig. 7 (b) is used as a low heat-resistant surface mount component 1.
- the equipment used for reflow soldering has five heating zones (a pair of heaters above and below the substrate transport conveyor) that uses infrared rays and hot air together, and nitrogen is used in the soldering atmosphere to increase the oxygen concentration. This is the method of lOOppm.
- the 48-lead TSOP is connected to the long side of the package with the most severe connection conditions on the circuit board.
- the content is 7 mass%, which is the maximum amount that the TSOP can secure a temperature cycle life of 1000 cycles at 55-125 ° C, and a solder with a composition of Sn-3Ag-0.5Cu-7In was used. .
- the place where the temperature becomes lowest during reflow soldering is the solder joint located near the center 2b (Fig. 7) of this full grid type BGA1, and the temperature is the highest in the full grid type BGA1.
- the location is near the outer periphery 2a (particularly the corner: Fig. 7), and the temperature of this part should not exceed 220 ° C, which is the heat resistance temperature of the full grip type BGA1.
- thermocouples are installed at the solder connection part 2b near the center of the full grid type BGA1 and the corner part of the package la of the full grid type BGA1.
- the peak temperature at the corner of the package la of the full-drip type BGA1 was adjusted to 220 ° C
- the peak temperature of the solder joint at the center 2b of this full-grip type BGA1 Is at 204 ° C
- the solder bump 3 is formed of Sn-3Ag-0.
- solder bump 3 is formed with Sn-3Ag-0.5Cu- (4-7) In solder as described above In such a case, no poor melting of the solder paste was generated.
- a circuit board that is soldered to a circuit board and does not affect the performance of the circuit board or the low heat resistant surface mount part. Since it can be removed, it is possible to recycle low-heat-resistant surface-mount components with excellent reliability and mounting substrates bump-bonded to these components, making it possible to use resources effectively and to be economical.
- FIG. 1 is a front view showing a specific example of a low heat resistant surface mount component according to the present invention.
- FIG. 2 is a view showing a main part of a specific example of an apparatus for removing the low heat-resistant surface mount component shown in FIG. 1 from the circuit board.
- FIG. 3 is an exploded perspective view showing a configuration of a mounting table in the apparatus shown in FIG.
- FIG. 4 is a diagram showing the configuration of the tip of the local heating nozzle in the apparatus shown in FIG.
- FIG. 5 is a diagram for explaining the vicinity of the outer periphery and the center of the low heat-resistant surface mount component in FIG.
- Fig. 6 is a diagram showing the results of a temperature cycle test at -55-125 ° C of the mounting board when the circuit board strength low heat-resistant surface mounting components can be removed with the apparatus shown in Fig. 2.
- FIG. 7 is a front view showing a specific example of a low heat-resistant surface mount component to be soldered in a reflow soldering process.
- FIG. 8 is a diagram showing the results of a temperature cycle test at 55 ° C. to 125 ° C. of the mounting board obtained by reflow soldering the low heat resistant surface mounting component shown in FIG. 7 to the circuit board. Description
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
- Structures For Mounting Electric Components On Printed Circuit Boards (AREA)
- Wire Bonding (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2005800237923A CN1985551B (zh) | 2004-07-15 | 2005-02-28 | 低耐热性表面安装部件以及与其进行凸点连接的安装基板 |
US11/572,030 US20080261001A1 (en) | 2004-07-15 | 2005-02-28 | Mounting Substrate Suitable for Use to Install Surface Mount Components |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-208711 | 2004-07-15 | ||
JP2004208711A JP2006032619A (ja) | 2004-07-15 | 2004-07-15 | 低耐熱性表面実装部品及びこれをバンプ接続した実装基板 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006008850A1 true WO2006008850A1 (ja) | 2006-01-26 |
Family
ID=35784983
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/003277 WO2006008850A1 (ja) | 2004-07-15 | 2005-02-28 | 低耐熱性表面実装部品及びこれをバンプ接続した実装基板 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20080261001A1 (ja) |
JP (1) | JP2006032619A (ja) |
CN (1) | CN1985551B (ja) |
WO (1) | WO2006008850A1 (ja) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8004075B2 (en) * | 2006-04-25 | 2011-08-23 | Hitachi, Ltd. | Semiconductor power module including epoxy resin coating |
JP5024380B2 (ja) * | 2007-07-13 | 2012-09-12 | 千住金属工業株式会社 | 車載実装用鉛フリーはんだと車載電子回路 |
JP5339968B2 (ja) * | 2009-03-04 | 2013-11-13 | パナソニック株式会社 | 実装構造体及びモータ |
JP6251235B2 (ja) * | 2012-03-20 | 2017-12-20 | アルファ・アセンブリー・ソリューションズ・インコーポレイテッドAlpha Assembly Solutions Inc. | はんだ予成形品およびはんだ合金組付方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62137193A (ja) * | 1985-11-27 | 1987-06-20 | アライド・コ−ポレ−シヨン | 保存寿命を改良したはんだ付け用合金及びその製造方法及びはんだ付け法 |
JP2002141652A (ja) * | 2000-11-02 | 2002-05-17 | Matsushita Electric Ind Co Ltd | 電子部品および電子部品の実装方法ならびに実装構造 |
JP2003094193A (ja) * | 2002-06-18 | 2003-04-02 | Matsushita Electric Ind Co Ltd | 鉛フリー半田ペースト |
JP2003318530A (ja) * | 2002-04-25 | 2003-11-07 | Fuji Electric Co Ltd | リフロー半田付け装置 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0235546B1 (de) * | 1986-02-19 | 1991-07-24 | Degussa Aktiengesellschaft | Verwendung einer Weichlotlegierung zum Verbinden von Keramikteilen |
US6046499A (en) * | 1996-03-27 | 2000-04-04 | Kabushiki Kaisha Toshiba | Heat transfer configuration for a semiconductor device |
JP4311774B2 (ja) * | 1998-03-11 | 2009-08-12 | 富士通株式会社 | 電子部品パッケージおよびプリント配線板 |
US6858941B2 (en) * | 2000-12-07 | 2005-02-22 | International Business Machines Corporation | Multi-chip stack and method of fabrication utilizing self-aligning electrical contact array |
JP3615206B2 (ja) * | 2001-11-15 | 2005-02-02 | 富士通株式会社 | 半導体装置の製造方法 |
-
2004
- 2004-07-15 JP JP2004208711A patent/JP2006032619A/ja active Pending
-
2005
- 2005-02-28 CN CN2005800237923A patent/CN1985551B/zh not_active Expired - Fee Related
- 2005-02-28 WO PCT/JP2005/003277 patent/WO2006008850A1/ja active Application Filing
- 2005-02-28 US US11/572,030 patent/US20080261001A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62137193A (ja) * | 1985-11-27 | 1987-06-20 | アライド・コ−ポレ−シヨン | 保存寿命を改良したはんだ付け用合金及びその製造方法及びはんだ付け法 |
JP2002141652A (ja) * | 2000-11-02 | 2002-05-17 | Matsushita Electric Ind Co Ltd | 電子部品および電子部品の実装方法ならびに実装構造 |
JP2003318530A (ja) * | 2002-04-25 | 2003-11-07 | Fuji Electric Co Ltd | リフロー半田付け装置 |
JP2003094193A (ja) * | 2002-06-18 | 2003-04-02 | Matsushita Electric Ind Co Ltd | 鉛フリー半田ペースト |
Also Published As
Publication number | Publication date |
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CN1985551A (zh) | 2007-06-20 |
JP2006032619A (ja) | 2006-02-02 |
CN1985551B (zh) | 2010-12-15 |
US20080261001A1 (en) | 2008-10-23 |
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