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Printed Wiring Card and Board Package for Semiconductors

IP.com Disclosure Number: IPCOM000048915D
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 3 page(s) / 54K

Publishing Venue

IBM

Related People

Ecker, ME: AUTHOR [+2]

Abstract

Currently, circuit cards are populated with modules containing semiconductor chips ana plugged into a printed wiring board via an edge mounted connector. Presently, eighteen of these cards may be plugged into a standard circuit board.

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Printed Wiring Card and Board Package for Semiconductors

Currently, circuit cards are populated with modules containing semiconductor chips ana plugged into a printed wiring board via an edge mounted connector. Presently, eighteen of these cards may be plugged into a standard circuit board.

With the advent of VLSI (very large-scale integration) semiconductor capability, module pin I/O has had to be increased to handle the increased circuit density on the module. This results in diminished wireability for the new modules and hence a mandatory depopulation of the number of modules allowed per card. Presently it requires a card of twice the height (4W x 6H) to wire four 36 mm modules each having a single chip with approximately 5000 circuits and a module with 212 pins.

The apparatus of this article provides for increasing the number of modules wireable on a card as well as increasing the number of cards possible on a board from 18 to 24.

The figure illustrates, in elevation view, a portion of the improved card on board system. Two circuit cards 1 and 2 are shown mounted in back to back relationship on a split connector housing 3. Each card is processed independently for the mounting of modules 4 and for the reception of one part of the split housing 3. The card 2 is mounted to the right half of split housing 3. Contact blades 5, 6 and 7 are solder attached to the cards and anchored in the housing 3.

A plurality of connection pins 8 are pressed into a predetermined set of plated through holes in card 2 until edge stops 8a are seated.

Circuit card 1 is similarly configured and mounted to the left half of the split connector 3. Circuit card 1 is placed over the pins 8 and pressed on until the stops 8a on the pins are seated. A molded key 9 seats in grooves at the interface of the left and right half portions of the split connector 3. A coupling plate 10 i...