Browse Prior Art Database

Organic Card Device Carrier

IP.com Disclosure Number: IPCOM000103003D
Original Publication Date: 1990-May-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 47K

Publishing Venue

IBM

Related People

Hinrichsmeyer, K: AUTHOR [+4]

Abstract

An organic circuit baord, having copper on both sides, is used to make a machined chip carrier having thermal expansion characteristics of a next level of circuit board. Chip carriers of this type may be stacked and reflow solder mounted together. Chips mounted in this type of carrier are testable from either side of the carrier.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Organic Card Device Carrier

      An organic circuit baord, having copper on both sides, is used
to make a machined chip carrier having thermal expansion
characteristics of a next level of circuit board. Chip carriers of
this type may be stacked and reflow solder mounted together.  Chips
mounted in this type of carrier are testable from either side of the
carrier.

      The figure is a cross section of three completed, stacked
carriers with chips mounted and wire bonded in them. Parts of the top
carrier are numbered to aid in explanation of construction.  Top side
of circuit board 2 is photoetched to form wire bond pads 4 and
conductors 6 to solder pads 8. The other side of circuit board 2 is
photoetched to form solder pads 10 and machined to create a recess in
which chip 12 is mounted via tape 14.  Holes are drilled or punched
through board 2 in the center of solder pads 8 and 10. Solder
connection 16 is made from top to bottom of the circuit board at
solder pads by wave soldering.  A machined slot through the board
provides access to the top of chip 12 for forming wire bonds 18 from
chip 12 to wire bond pads 4 on the carrier.  Any number of carriers
may be stacked and reflow soldered together and soldered to a next
level of circuit board (not shown).

      Disclosed anonymously.