EP0069733A1 - Enveloppe de circuit integre - Google Patents

Enveloppe de circuit integre

Info

Publication number
EP0069733A1
EP0069733A1 EP19810901586 EP81901586A EP0069733A1 EP 0069733 A1 EP0069733 A1 EP 0069733A1 EP 19810901586 EP19810901586 EP 19810901586 EP 81901586 A EP81901586 A EP 81901586A EP 0069733 A1 EP0069733 A1 EP 0069733A1
Authority
EP
European Patent Office
Prior art keywords
lead frame
opening
contacts
lead
semiconductor package
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19810901586
Other languages
German (de)
English (en)
Inventor
Joseph Link
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CTU of Delaware Inc
Original Assignee
Mostek Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mostek Corp filed Critical Mostek Corp
Publication of EP0069733A1 publication Critical patent/EP0069733A1/fr
Withdrawn legal-status Critical Current

Links

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
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/02—Arrangements of circuit components or wiring on supporting structure
    • H05K7/10—Plug-in assemblages of components, e.g. IC sockets
    • H05K7/1053—Plug-in assemblages of components, e.g. IC sockets having interior leads
    • 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
    • H01L23/04—Containers; Seals characterised by the shape of the container or parts, e.g. caps, walls
    • H01L23/053—Containers; Seals characterised by the shape of the container or parts, e.g. caps, walls the container being a hollow construction and having an insulating or insulated base as a mounting for the semiconductor body
    • H01L23/057—Containers; Seals characterised by the shape of the container or parts, e.g. caps, walls the container being a hollow construction and having an insulating or insulated base as a mounting for the semiconductor body the leads being parallel to the base
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/32—Holders for supporting the complete device in operation, i.e. detachable fixtures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Definitions

  • the present invention relates generally to a package for a semiconductor device, and more particularly to an integrated circuit package having pin and socket connections integrally formed therein.
  • Integrated circuit (IC) chips are typically enclosed in packages to provide environmental and mechanical protection as well as electrical connection with a circuit board or other components.
  • Such packages have generally included a body of nonconductive material with external lead pins by which the chip encased therein can be connected to a circuit board.
  • a substantial portion of the cost and size of a packaged chip is attributable to its package, and two important design criteria in addition to providing a reliable electrical connection are cost effectiveness and space efficiency. Further, it is generally desirable to design such packages for quick and easy disconnection to facilitate testing and replacement.
  • microprocessor chips with the desired program logic -contained therein are often utilized in conjunction with erasable programmable read only memory (EPROM) chips containing stored parameters which can be erased by ultraviolet light and reprogrammed with new parameters as necessary.
  • EPROM erasable programmable read only memory
  • a window must be provided in the package of the EPROM chip for transmission of the ultraviolet light. It is of course possible to combine the functions of a microprocessor and EPROM into a single monolithic integrated circuit and package, however, this has proven to be quite expensive due to the low chip per wafer yield associated with the manufacture of semiconductor devices and the relatively low production rates of such monolithic chips.
  • the present invention comprises an integrated circuit package which overcomes the foregoing and other difficulties associated with the prior art.
  • a semiconductor package comprised of a bottom pin subassembly, an intermediate socket subassembly and an upper socket cover.
  • the pin subassembly includes a nonconductive body formed around a lead frame defining external lead pins and internal bonding fingers.
  • the socket subassembly includes a nonconductive body formed around a lead frame defining external socket contacts and internal bonding fingers.
  • the pin and socket subassemblies define a cavity for the semiconductor chip which in turn is wire bonded to the internal bonding fingers thereof.
  • the external socket contacts of the socket subassembly are adapted to cooperate with openings in the cover to def ine integral socket connections for receiving lead pins from another semiconductor package or other electrical component.
  • the external lead pins of the pin subassembly provide the connection by which the package can be plugged into a circuit board or the like.
  • FIGURE 1 is a perspective exploded view of the integrated circuit package of the invention
  • FIGURE 2 is a top view, partially cutaway, of the assembled package
  • FIGURE 3 is a longitudinal cross section of the assembled package
  • FIGURE 4 is a lateral cross section of the assembled package.
  • Package 10 is comprised of a socket cover 12, a socket subassembly 14 and a pin subassembly 16 particularly adapted to be assembled into a package which provides integral pin and socket connections to facilitate connection of a semiconductor chip 18 with a circuit board as well as other semiconductor packages.
  • the pin subassembly 16 comprises an elongate, generally rectangular body 20 of nonconductive material formed around a lead frame 22 of conductive material.
  • the lead frame 22 defines a plurality of external lead pins 24 extending downwardly in rows along opposite longitudinal sides of body 20.
  • the pin leads 24 are connected with corresponding internal- bonding fingers 26 of the lead frame 22 which terminate- around a rectangular opening or recess formed in body 20 within which the semiconductor chip 18 is located.
  • the pins 24 provide the electrical contacts by which package 10 is plugged into an underlying circuit board or another semiconductor package, while bonding fingers 26 provide the electrical path by which the pins are connected to chip 18 via wire. bonds 28 as is best seen in FIGURES 2. For purposes of clarity, the wire bonds 28 have been omitted from FIGURES 1, 3 and 4.
  • the semiconductor chip 18 is attached by means of conventional die attachment techniques to a rectangular base plate 30 secured within the opening in body 20.
  • the opening in body 20 is substantially centrally positioned within a flat recessed portion 32 located between two raised end portions 34.
  • a notch 36 with substantially perpendicular corners is provided in the inside surface of one end portion 34 while a different notch 38 with inclined corners is provided in the opposite surfaces of the other end portion.
  • notches 36 and 38 can be of similar configurations, the notches are preferably of different shapes to insure proper mating orientation and engagement with the socket subassembly 14.
  • body 20 is formed of plastic or other suitable nonconductive material to facilitate insertion molding around lead frame 22 using a suitable split mold and conventional molding techniques.
  • plastic or other suitable nonconductive material for example, polyphenolene sulfide sold under the brand name RYTON by Phillips Chemical Company of Houston, Texas offers temperature, shrink and moisture permeability properties which makes it suitable for use in forming body 20. Alloy 42, copper alloy or other suitable material can be utilized for the lead frame 22.
  • lead frames are produced in initially flat condition with the lead pins connected to opposite sides of a tie bar frame and with the bonding fingers all connected to a central pad.
  • the body 20 is initially molded around the flat lead frame 22 such that the pad (not shown) interconnecting bonding fingers 26 is located within the central body opening.
  • the partial subassembly 16 is separated from the strip of lead frames by cutting off the lateral cross pieces (not shown) interconnecting the side tie bars (not shown) of the lead frame 22.
  • the central pad interconnecting bonding fingers 26 is then punched out to clear the opening in body 20, and lead pins 24 are bent downwardly at substantially right angles as shown.
  • the tie bars interconnecting each row of lead pins 24 are usually left in place to protect the pins during subsequent handling.
  • plate 30 is secured in place to close the bottom of the central opening in body 20 and to provide a base for chip 18.
  • plate 30 rests on a flange 40 formed around the underside of the opening in body 20 separated from the bonding fingers 26 and in electrical isolation therewith.
  • Plate 30 can Be of nonconductive material, such as plastic, or conductive material such as aluminum, depending upon the requirements of die 18.
  • Plate 30 can be secured to body 20 by any suitable fastening means. As illustrated, the plate 30 is secured in place by integral projections 42 of body 20 bent inwardly.
  • pin subassembly 16 is shown with a separate base plate 30 secured in an opening formed in body 20, it will be understood that the subassembly can be formed with a central recess in portion 32 such that the base plate is integral with the body.
  • the internal bonding fingers 26 of lead frame 22 would therefore terminate around a recess or cavity closed at the bottom.
  • the pin subassembly 16 is shown with a lead frame 22 having forty lead pins 24 and corresponding bonding fingers 26, however, this number is not critical to the invention and it will be understood that any suitable number of lead pins and bonding fingers can be utilized in accordance with the particular application. If desired, a plurality of standoff feet 44 can be integrally formed into the bottom surface of body 20 for spacing purposes.
  • the socket subassembly 14 is comprised of a plate 46 formed around another lead frame 48 defining a plurality of external socket contacts 50 and corresponding bonding fingers 52.
  • Plate 46 is of flat, generally rectangular shape and is adapted to fit into the recessed portion 32 of pin subassembly 16.
  • Complementary projections 54 and 56 are preferably provided on opposite ends of plate 46 for receipt in notches 36 and 38, respectively, of subassembly 16.
  • projections 54 and 56 is not critical to practice of the invention; however, but the use of such projections, and particularly projections of different configurations, is desired to facilitate proper mating of subassemblies 14 and 16.
  • projection 54 is generally rectangular with perpendicular corners while projection 56 has inclined corners.
  • Bonding fingers 52 of lead frame 48 terminate around an opening in plate 46 which is positioned to register with the opening formed in subassembly 16.
  • the external contacts 50 of lead frame 48 are formed to cooperate with cover 12 and define integral socket connections by which other semiconductor packages, connectors or other electronic components can be plugged into package 10 as will be explained more fully hereinafter.
  • the socket subassembly 14 is formed of similar materials and in similar fashion to subassembly 16.
  • plastic is molded around the lead frame 48, which is flat initially, within a split mold by means of conventional insertion molding techniques.
  • Suitable nonconductive material such as polyphenolene sulfide like that mentioned above for body 20 in subassembly 16, can be used for plate 46.
  • the lateral cross pieces between the partial subassemblies 14 in the strip of lead frames are cut to separate the subassembly from others in the strip.
  • the central pad interconnecting bonding fingers 52 is then punched or cut out to clear the opening in plate 46.
  • the contacts 50 are then bent upwardly and the side tie bars interconnecting the contacts are usually left in place for protection during subsequent handling.
  • the socket subassembly 14 is shown with twenty eight external socket contacts 50 and corresponding fingers 52, however, it will be appreciated that this number is not critical to the invention and that any suitable number of contacts and fingers can be utilized dependent upon the particular application.
  • bonding fingers 52 are shown only en opposite ends of the opening in plate 46, the bending fingers can be arranged to extend into the opening in any arrangement desired. If desired, ribs (not shown) can be provided on adjacent mating surfaces of plate 46 and body 20 for ultrasonic tack welding purposes.
  • the socket subassembly 14 and pin subassembly 16 are interconnected followed by attachment of the semiconductor chip 18 and connection thereof to the bonding fingers of the two subassemblies.
  • Plate 46 of subassembly 14 can be secured to body 20 of subassembly 16 by any suitable means including ultrasonic welding, staking, adhesives, etc.
  • the openings in subassemblies 14 and 16 define a cavity for receiving chip 18.
  • Chip 18 is then secured to plate 30 by means of conventional die attachment techniques.
  • the contact pads of semiconductor chip 18 are then connected to bonding fingers 26 and 52 by means of wires 28 and 58, respectively, in accordance with well known wire bonding techniques to electrically interconnect the chip with pins 24 and contacts 50.
  • the cavity defined by plate 46 and body 20 can then be filled with suitable petting material to protect chip 18 and wire bonds 28 and 58.
  • the tie bars interconnecting contacts 50 of socket subassembly 14 are then cut away so that the contacts can be formed into general S-shapes before cover 12 is secured thereto.
  • package 10 is shown electrically connected directly to bonding fingers 26 and 52 by wires 28 and 58 respectively. This has been found to be the most practical, however, other approaches can be taken.
  • bonding fingers 26 and 52 can be wired together or formed to make mechanical contact upon engagement of subassemblies 14 and 20.
  • the manner in which chip 18 is electrically connected to lead frames 22 and 48 is not critical to practice of the invention.
  • Cover 12 of package 10 comprises a generally rectangular body of nonconductive material having socket openings integrally formed therein for cooperation with contacts 50 to define socket connections.
  • cover 12 is also formed of plastic material such as polyphenolene sulfide.
  • Extensions 60 are provided on the upper surface of cover 12 along opposite longitudinal sides thereof.
  • a plurality of socket openings 62 are formed in each extension 60 with one opening being provided for each contact 50 on socket subassembly 14.
  • each socket opening 62 is comprised of an upper portion 62a for receiving the lead pins (not shown) of another package, connector, or other electric components, and a lower portion 62b for receiving an S-shaped contact 50 on subassembly 14.
  • a flange or skirt 64 is provided along each longitudinal side of the bottom of cover 12 to provide an overlap with the socket subassembly 14 when the recessed portion 66 of the cover is placed over plate 46 to close the chip cavity.
  • the skirts 64 can be continuous along their lengths; however, as illustrated, the skirts are cut away and dividers 68 and provided between each socket opening 62 to facilitate side access to contacts 50 for testing purposes, etc.
  • Cover 12 can be secured to plate 46 and thus to body 20 by any suitable connection means including ultrasonic welding, staking or adhesives.
  • the present invention comprises a new and improved semiconductor package having several advantages over the prior art.
  • Significant advantages include the fact that molded plastic and prefabricated lead frames are utilized to form a package having integral socket connections thereon which eliminate the need for separate interconnects.
  • the invention provides a less expensive alternative to the semiconductor packages of the prior art.
  • Other advantages will be evident to those skilled in the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Structures Or Materials For Encapsulating Or Coating Semiconductor Devices Or Solid State Devices (AREA)

Abstract

Enveloppe amelioree pour circuit integre (10) comprenant un couvercle (12), un sous-ensemble intermediaire (14) et un sous-ensemble formant fond (16). Les sous-ensembles intermediaires et formant fond (14, 16) comprennent des cadres d'alimentation (48, 22) qui sont noyes respectivement dans ces sous-ensembles, ainsi que des ouvertures qui definissent une cavite pour une micro-plaquette semi-conductrice. Les broches d'alimentation externes (24) du sous-ensemble formant fond (16) permettent de connecter l'enveloppe avec une plaquette ou similaire alors que les contacts externes (50) du sous-ensemble intermediaire (14) cooperent avec des ouvertures (62) dans le couvercle pour former des prises permettant la connexion avec d'autres enveloppes de semi-conducteurs ou de composants electriques.
EP19810901586 1981-01-15 1981-01-15 Enveloppe de circuit integre Withdrawn EP0069733A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1981/000059 WO1982002458A1 (fr) 1981-01-15 1981-01-15 Enveloppe de circuit integre

Publications (1)

Publication Number Publication Date
EP0069733A1 true EP0069733A1 (fr) 1983-01-19

Family

ID=22161042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810901586 Withdrawn EP0069733A1 (fr) 1981-01-15 1981-01-15 Enveloppe de circuit integre

Country Status (2)

Country Link
EP (1) EP0069733A1 (fr)
WO (1) WO1982002458A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4815595A (en) * 1986-12-03 1989-03-28 Sgs-Thomson Microelectronics, Inc. Uniform leadframe carrier
US5111935A (en) * 1986-12-03 1992-05-12 Sgs-Thomson Microelectronics, Inc. Universal leadframe carrier
CN113451238B (zh) * 2021-07-16 2022-06-21 贵州中芯微电子科技有限公司 一种中空式集成电路封装

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3748543A (en) * 1971-04-01 1973-07-24 Motorola Inc Hermetically sealed semiconductor package and method of manufacture
US4079511A (en) * 1976-07-30 1978-03-21 Amp Incorporated Method for packaging hermetically sealed integrated circuit chips on lead frames
US4080026A (en) * 1976-10-28 1978-03-21 Richard Gianni Multi-level socket for an integrated circuit
US4142287A (en) * 1976-12-27 1979-03-06 Amp Incorporated Electrical devices such as watches and method of construction thereof
US4139726A (en) * 1978-01-16 1979-02-13 Allen-Bradley Company Packaged microcircuit and method for assembly thereof
US4224637A (en) * 1978-08-10 1980-09-23 Minnesota Mining And Manufacturing Company Leaded mounting and connector unit for an electronic device
US4271426A (en) * 1978-08-10 1981-06-02 Minnesota Mining And Manufacturing Company Leaded mounting and connector unit for an electronic device
US4195193A (en) * 1979-02-23 1980-03-25 Amp Incorporated Lead frame and chip carrier housing

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8202458A1 *

Also Published As

Publication number Publication date
WO1982002458A1 (fr) 1982-07-22

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Effective date: 19830311

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Inventor name: LINK, JOSEPH