Browse Prior Art Database

Control of Lead Bending Via Flex Buttressing

IP.com Disclosure Number: IPCOM000103379D
Original Publication Date: 1990-Oct-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 28K

Publishing Venue

IBM

Related People

Grebe, KR: AUTHOR [+3]

Abstract

Disclosed is an approach for minimizing the thermally induced lead bending in structures requiring the use of flexible foil edge connectors (flexes) with partially supported metal leads for substrate to substrate interconnection. In this approach, the flexes are "buttressed" or "anchored" more rigidly to the substrate on either side or on both sides with the use of adhesives or buttress leads in areas where lead bending is severe during thermal cycling. With the buttress lead approach, the substrate must have matching pads for the buttress leads to be joined to via soldering, our preferred method. A buttress lead by definition is not powered up during package operation. It can be either one single strip of metal or many strips.

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Control of Lead Bending Via Flex Buttressing

      Disclosed is an approach for minimizing the thermally induced
lead bending in structures requiring the use of flexible foil edge
connectors (flexes) with partially supported metal leads for
substrate to substrate interconnection. In this approach, the flexes
are "buttressed" or "anchored" more rigidly to the substrate on
either side or on both sides with the use of adhesives or buttress
leads in areas where lead bending is severe during thermal cycling.
With the buttress lead approach, the substrate must have matching
pads for the buttress leads to be joined to via soldering, our
preferred method. A buttress lead by definition is not powered up
during package operation. It can be either one single strip of metal
or many strips. Typically, the larger the area of adhesive
application or the wider the buttress lead, the greater is the
ability of electrically functional leads to resist bending during
thermal cycling.

      Disclosed anonymously.