CN111952252A - Surface-mounted ceramic metal shell's high current-carrying lead structure of low resistance - Google Patents
Surface-mounted ceramic metal shell's high current-carrying lead structure of low resistance Download PDFInfo
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- CN111952252A CN111952252A CN202010677664.7A CN202010677664A CN111952252A CN 111952252 A CN111952252 A CN 111952252A CN 202010677664 A CN202010677664 A CN 202010677664A CN 111952252 A CN111952252 A CN 111952252A
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- lead
- ceramic
- low resistance
- high current
- sealing ring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/02—Containers; Seals
- H01L23/10—Containers; Seals characterised by the material or arrangement of seals between parts, e.g. between cap and base of the container or between leads and walls of the container
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/02—Containers; Seals
- H01L23/06—Containers; Seals characterised by the material of the container or its electrical properties
- H01L23/08—Containers; Seals characterised by the material of the container or its electrical properties the material being an electrical insulator, e.g. glass
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/367—Cooling facilitated by shape of device
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/49—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions wire-like arrangements or pins or rods
Abstract
The invention relates to a low-resistance high-current-carrying lead structure of a surface-mounted ceramic metal shell. Including ceramic package, sealing ring, interior bonding piece, wall lead wire, outer lead wire and heat sink boss, a side of ceramic package sets up the wall lead wire, and heat sink boss sets up in the bottom of ceramic package, and interior bonding piece sets up the wall lead wire at ceramic package internal connection, and the sealing ring sets up around the upper portion of ceramic package, and the sealing ring is connected with ceramic package brazing. The ceramic shell adopts 95 percent of Al2O3. The outer lead is of an integrated structure and is made of kovar copper materials, oxygen-free copper is coated on the 4J29 materials, and the thickness of the oxygen-free copper is 0.15 mm. The welding part of the outer lead is in a 7-shaped structureThe method comprises the steps of removing burrs by a magnetic grinding machine, cleaning for 3 times by deionized water, passing through 10% hydrochloric acid, cleaning for 3 times, and drying for 60 minutes at 110 ℃. The design of the invention realizes the low resistance design of the lead by kovar copper, oxygen-free copper and CMC structure, and the resistance of the lead meets less than or equal to 2m omega.
Description
Technical Field
The invention relates to a low-resistance high-current-carrying lead structure of a surface-mounted ceramic metal shell.
Background
The low lead wire resistive surface mount type ceramic package series is used for surface mounting type power device package, and is generally used in low lead wire linear voltage stabilizer for supplying voltage in electronic system. Because the output voltage or load of the linear voltage stabilizer responds more quickly than the switching voltage stabilizer, the ripple and noise of the output voltage are lower, the circuit structure is simpler, the volume is smaller, and the linear voltage stabilizer is widely used in various portable systems powered by batteries and communication related electronic products. However, the products on the market can not reach the military grade at present, so that a low-resistance high-current-carrying ceramic metal shell meeting the military standard is urgently needed.
Disclosure of Invention
To solve the problems mentioned in the background art, the present invention discloses a low resistance high current carrying lead structure of a surface-mounted ceramic metal case.
In order to achieve the above purpose, the following technical solutions are provided:
the utility model provides a table pastes high current-carrying lead wire structure of low resistance of type ceramic metal casing, includes ceramic package, sealing ring, interior bonding piece, wall lead wire, outer lead wire and heat sink boss, a side of ceramic package sets up the wall lead wire, and heat sink boss sets up in the bottom of ceramic package, and interior bonding piece sets up at ceramic package internal connection wall lead wire, and the sealing ring sets up around the upper portion of ceramic package, and the sealing ring is connected with ceramic package brazing.
Further, the ceramic shell adopts 95% of Al2O3。
Furthermore, the outer lead is of an integrated structure and is made of Kovar copper materials, oxygen-free copper is coated on the 4J29 materials, and the thickness of the oxygen-free copper is 0.15 mm.
Further, the welding position of the outer lead is in a 7-shaped structure, burrs are removed by a magnetic grinding machine, then deionized water is adopted for cleaning for 3 times, 10% hydrochloric acid is used for filtering, after cleaning for 3 times, drying is carried out for 60 minutes at 110 ℃.
Furthermore, the welding area of the outer lead and the ceramic shell is not less than 0.8mm2The outer lead and the ceramic shell are metalized at the welding position, the solder extends outwards at the position during sintering, the sealing strength of the outer lead and the ceramic shell is increased, the ceramic shell is placed in a sintering mold during the sintering process of the lead and the ceramic, and a gravity pressing block is placed on the lead to prevent the lead from warping during the brazing process.
Furthermore, the wall lead is made of an oxygen-free copper material.
Furthermore, the inner bonding sheet is made of a flat composite material with a CMC sandwich structure, pure molybdenum is adopted in the middle, and oxygen-free copper is coated on two sides.
Furthermore, the peripheral outer edge of the sealing ring is 0.20mm smaller than the outer edge of the ceramic shell, meanwhile, the sealing surface of the ceramic shell is chamfered, and the sealing ring and the ceramic shell are brazed and connected in a parallel seam welding mode.
Furthermore, the heat sink boss is back-gouged, and the peripheral gap between the heat sink boss and the ceramic shell is set to be 0.1 mm.
The invention has the beneficial effects that:
1. the low-resistance high-current-carrying lead structure of the surface-mounted ceramic metal shell realizes the low-resistance design of the lead through kovar copper, oxygen-free copper and CMC structures, and the lead resistance meets less than or equal to 2m omega.
2. According to the low-resistance high-current-carrying lead structure of the surface-mounted ceramic metal shell, the sealing strength is improved due to the chamfer design of the ceramic shell and the sealing ring, and meanwhile, the phenomenon that the edge of a ceramic part is broken off and the air tightness is influenced when the cover is sealed in a parallel seam welding mode is solved.
3. According to the low-resistance high-current-carrying lead structure of the surface-mounted ceramic metal shell, the heat sink part adopts the step structure, so that the welding stress of the sealing part is reduced, and the mechanical strength of the heat sink is ensured.
Drawings
FIG. 1 is a schematic diagram of a front cross-sectional view of a low resistance, high current carrying lead configuration of a surface mount ceramic metal housing;
FIG. 2 is a side cross-sectional view of a low resistance, high current carrying lead configuration of a surface mount ceramic metal housing;
FIG. 3 is a bottom view of a low resistance, high current carrying lead configuration of a surface mount ceramic metal housing;
FIG. 4 is a top view of a low resistance, high current carrying lead configuration of a surface mount ceramic metal housing;
FIG. 5 is a die set-up view during soldering of a low resistance, high current carrying lead configuration of a surface mount ceramic metal housing;
FIG. 6 is a CMC sandwich construction of a low resistance high current carrying lead configuration of a surface mount ceramic metal can;
FIG. 7 is a front and top view of a heat sink boss of a low resistance high current carrying lead configuration of a surface mount ceramic metal housing;
FIG. 8 is a top view of 5 outer leads of a low resistance, high current carrying lead configuration of a surface mount ceramic metal housing;
FIG. 9 is a side cross-sectional view of a low resistance, high current carrying lead configuration of 5 outer leads soldered to a ceramic package of a surface mount ceramic-to-metal package;
fig. 10 is a comparison of lead resistance data in m Ω for a low resistance package lead and a conventional package for a low resistance, high current carrying lead configuration of a surface mounted ceramic metal package in table 1.
Fig. 11 is a comparison of lead resistance data in m Ω for a low resistance case lead and a conventional case for a low resistance high current carrying lead configuration of a surface mount ceramic metal case of table 2.
Wherein: 1. a ceramic housing; 11. chamfering the sealing surface of the ceramic shell by 0.20 multiplied by 45 degrees; 12. side metallization; 13. back metallization; 2. a heat sink boss; 3. a sealing ring; 31. a solder tensile angle; 4. an outer lead; 41. 4J29 material; 42. oxygen-free copper; 43. the welding position of the outer lead and the ceramic shell; 44. extending solder at the outer lead; 5. a through-wall lead; 6. an inner bonding tab; 7. sintering the mold; 8. and (5) gravity briquetting.
Detailed Description
In order to make the technical solution of the present invention more clear and definite for those skilled in the art, the technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the embodiments of the present invention are not limited thereto.
As shown in fig. 1 to 11, a low-resistance high-current-carrying lead structure of a surface-mounted ceramic metal housing includes a ceramic housing 1, a sealing ring 3, an inner bonding sheet 6, a wall-through lead 5, an outer lead 4 and a heat sink boss 2, wherein the wall-through lead 5 is disposed on one side surface of the ceramic housing 1, and the wall-through lead is made of TU1 material, i.e., oxygen-free copper material.The heat sink boss 2 is arranged at the bottom of the ceramic shell 1, the inner bonding sheet 6 is arranged at the inner part of the ceramic shell 1 and connected with the wall lead 5, the sealing ring 3 is arranged around the upper part of the ceramic shell 1, and the sealing ring 3 is connected with the ceramic shell 1 in a brazing mode. The ceramic shell 1 adopts 95 percent of Al2O3。
Design of the 2m Ω on-resistance outer lead 4:
when the material of the outer lead 4 is selected, the suitable material is finally determined for lead design through calculation and comparison of the possibly suitable material. The calculation formula is as follows:
wherein R isMaterialRepresents the material resistance, Ω; ρ represents the resistivity of the material, Ω · m; l represents the lead length, m; s represents a cross-sectional area of the lead wire, m2。
Wherein, DeltaL represents the length variation of the lead in the process from T1 to T2, and is mm; α represents the linear expansion coefficient of the material,/° c; l represents lead length, mm; t1 and T2 represent the initial and final temperatures in degrees centigrade, respectively.
The outer lead 4 is of an integrated structure and is made of Kovar copper-clad material, oxygen-free copper 42 is covered on the 4J29 material 41, the thickness of the oxygen-free copper is 0.15mm, the Kovar copper-clad material is pressed at high temperature, the Kovar copper-clad material is formed by atomic combination of the two materials, and the reliability is high. The welding position of the outer lead 4 is in a 7-shaped structure, namely the welding position 43 of the outer lead 4 and the ceramic shell 1 is in a 7-shaped structure. The outer lead 4 is deburred by a magnetic grinder, then washed by deionized water for 3 times, filtered by 10% hydrochloric acid, washed for 3 times and dried for 60 minutes at 110 ℃.
The welding area of the outer lead 4 and the ceramic shell 1 is not less than 0.8mm2The outer lead 4 is side-metallized 12 at the weld 43 with the ceramic package 1, and back-metallized 13 at the back of the ceramic package 1 where the solder is sinteredAnd the extension, namely the solder extension 44 at the outer lead 4, increases the sealing strength between the outer lead 4 and the ceramic shell 1, the ceramic shell 1 is placed in a sintering mold 7 in the process of sintering the lead and the ceramic, and a gravity pressing block 8 is placed on the lead to prevent the lead from warping in the brazing process.
The inner bonding sheet 6 is made of a flat composite material with a CMC sandwich structure, pure molybdenum is adopted in the middle, and oxygen-free copper is coated on two sides. The peripheral outer edge of the sealing ring 3 is smaller than the outer edge of the ceramic shell 1 by 0.20mm, meanwhile, the sealing surface of the ceramic shell 1 is chamfered by 0.20 multiplied by 45 degrees 11, the sealing ring 3 and the ceramic shell 1 are connected in a parallel seam welding mode in a brazing mode, the sealing ring 3 is formed at the sealing position, the solder extension, the ceramic R0.30 and the sealing ring 3 are formed at the fillet R0.80, the solder tensile angle 31 is formed, and the welding strength of the sealing ring 3 and the ceramic shell is enhanced.
The heat sink boss 2 is back-gouged, and the gap between the heat sink boss 2 and the periphery of the ceramic shell 1 is set to be 0.1 mm. And enough expansion allowance of the tungsten-copper heat sink is reserved, so that the sealing stress is reduced, and the air tightness of the shell is ensured. By adopting a large fillet structure, the 4 inner fillets are 0.50mm, the outer fillet is 1.00mm, and the stress concentration at the fillet in the brazing process is effectively prevented. The heat sink adopts the condition that the linear expansion coefficient of W85Cu15 is not completely matched with that of the ceramic piece, or sealing stress exists, the W85Cu15 heat sink is in plane sealing with the ceramic piece, and the sealing stress is in direct proportion to the thickness of the W85Cu15 heat sink, namely P is in direct proportion to the thickness of the W85Cu15 heat sink. The W85Cu15 heat sink is too thick and can affect the package reliability due to excessive sealing stress. The W85Cu15 heatsink is too thin and can cause cracking of the user chip due to deformation when tested in the Y1, Y2 directions at constant acceleration. The invention can reduce the welding stress of the sealing part and ensure the mechanical strength of the heat sink by adopting the step structure. The size of the sealing part is controlled to be 0.30-0.40 mm, and the total thickness is controlled to be 0.70-0.80 mm.
While the invention has been described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The utility model provides a low resistance high current-carrying lead structure of surface mounted type ceramic metal casing which characterized in that: including ceramic package, sealing ring, interior bonding piece, wall lead wire, outer lead wire and heat sink boss, a side of ceramic package sets up the wall lead wire, and heat sink boss sets up in the bottom of ceramic package, and interior bonding piece sets up the wall lead wire at ceramic package internal connection, and the sealing ring sets up around the upper portion of ceramic package, and the sealing ring is connected with ceramic package brazing.
2. The low resistance, high current carrying lead structure of a surface mount ceramic metal housing of claim 1, wherein: the ceramic shell adopts 95 percent of Al2O3。
3. The low resistance, high current carrying lead structure of a surface mount ceramic metal housing of claim 1, wherein: the outer lead is of an integrated structure and is made of kovar copper materials, oxygen-free copper is coated on the 4J29 materials, and the thickness of the oxygen-free copper is 0.15 mm.
4. The low resistance, high current carrying lead structure of a surface mount ceramic metal housing of claim 3, wherein: the welding position of the outer lead is in a 7-shaped structure, burrs of the outer lead are removed by a magnetic grinding machine, then the outer lead is cleaned for 3 times by deionized water, and then cleaned for 3 times by 10% hydrochloric acid and dried for 60 minutes at 110 ℃.
5. The low resistance, high current carrying lead structure of a surface mount ceramic metal housing of claim 4, wherein: the welding area of the outer lead and the ceramic shell is not less than 0.8mm2The outer lead and the ceramic shell are metalized at the welding position, the solder extends outwards at the position during sintering, the sealing strength of the outer lead and the ceramic shell is increased, the ceramic shell is placed in a sintering mold during the sintering process of the lead and the ceramic, and a gravity pressing block is placed on the lead to prevent the lead from warping during the brazing process.
6. The low resistance, high current carrying lead structure of a surface mount ceramic metal housing of claim 1, wherein: the wall lead is made of an oxygen-free copper material.
7. The low resistance, high current carrying lead structure of a surface mount ceramic metal housing of claim 1, wherein: the inner bonding sheet is made of a flat composite material with a CMC sandwich structure, pure molybdenum is adopted in the middle, and oxygen-free copper is coated on two sides.
8. The low resistance, high current carrying lead structure of a surface mount ceramic metal housing of claim 1, wherein: the peripheral outer edge of the sealing ring is 0.20mm smaller than the outer edge of the ceramic shell, meanwhile, the sealing surface of the ceramic shell is chamfered, and the sealing ring and the ceramic shell are brazed and connected in a parallel seam welding mode.
9. The low resistance, high current carrying lead structure of a surface mount ceramic metal housing of claim 1, wherein: the heat sink boss is back-gouged, and the gap between the heat sink boss and the periphery of the ceramic shell is set to be 0.1 mm.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010677664.7A CN111952252B (en) | 2020-07-15 | 2020-07-15 | Surface-mounted type ceramic metal shell's low resistance high current-carrying lead structure |
| PCT/CN2021/077169 WO2022012045A1 (en) | 2020-07-15 | 2021-02-22 | Low-resistance high-current-carrying lead structure of surface-mounted ceramic metal housing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010677664.7A CN111952252B (en) | 2020-07-15 | 2020-07-15 | Surface-mounted type ceramic metal shell's low resistance high current-carrying lead structure |
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| CN111952252A true CN111952252A (en) | 2020-11-17 |
| CN111952252B CN111952252B (en) | 2023-03-10 |
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| WO (1) | WO2022012045A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022012045A1 (en) * | 2020-07-15 | 2022-01-20 | 青岛凯瑞电子有限公司 | Low-resistance high-current-carrying lead structure of surface-mounted ceramic metal housing |
| CN115602637A (en) * | 2022-11-02 | 2023-01-13 | 浙江东瓷科技有限公司（Cn） | Metal ceramic shell for replacing SOP-08 pure ceramic package and preparation method thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN111952252B (en) | 2023-03-10 |
| WO2022012045A1 (en) | 2022-01-20 |
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