Browse Prior Art Database

Surface Mounted Technology Card Rework with Flexible Applique

IP.com Disclosure Number: IPCOM000107884D
Original Publication Date: 1992-Mar-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 1 page(s) / 44K

Publishing Venue

IBM

Related People

Robertson, SE: AUTHOR [+2]

Abstract

Jumper wires ("Yellow-wire") have been used for decades to add electrical connections to printed circuit boards. With the finer geometries of Surface Mounted Technology (SMT) components, new methods of adding wire modifications are evolving.

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Surface Mounted Technology Card Rework with Flexible Applique

      Jumper wires ("Yellow-wire") have been used for decades to add
electrical connections to printed circuit boards.  With the finer
geometries of Surface Mounted Technology (SMT) components, new
methods of adding wire modifications are evolving.

      In order to make connection to a Plastic Leaded Chip Carrier
(PLCC), a connection method using a half plated hole is used.  Figure
1 shows the detail of a thin printed circuit board, 1/10 that of the
primary carrier, which is used to make the PLCC connection. It is
created by making a normal plated hole with an anular ring (1) on the
bottom a plated barrel (2) in the hole and a connection pad on the
top.

      The holes are placed one per pin to align with the PLCC pins.
Figure 2 shows the outline with the center section (1) routed out.
The route is through the diameter of each hole in the shape of the
PLCC.

      The holes may be plated for connection or non-plated. A thin
coating of solder can be applied to the copper to add strength during
the routing process.

      The thin printed circuit board is placed over the PLCC and
soldered into place where pads exist.  The connections are self
aligning and provide a reliable way to repeatedly make modification
to assembled electronic assemblies using PLCCs.

      Disclosed anonymously.