Assembly aid for mounting packaged integrated circuit devices to printed circuit boards
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United States of America Patent
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-
Jul 4, 2000
Grant Date -
N/A
app pub date -
Jun 4, 1998
filing date -
Nov 5, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An apparatus and method for surface-mounting ball grid array integrated circuit (IC) devices to printed circuit boards. A thin single- or multi-layer sheet of nonconductive material having a plurality of apertures corresponding to the leads of the IC device to be mounted is interposed between the ball grid array and the circuit board prior to solder processing to facilitate solder application, device alignment, and solder retention. An assembly guide is located on the top surface of the aid to assist in the orientation and placement of the IC device during assembly. In a further aspect, the disclosed assembly aid helps compensate for non-planarity in the IC device array or circuit board, and maintains a minimum standoff distance between the IC package and the circuit board to preclude undue solder joint deformation. The assembly aid also allows for reworking of the surface mount by facilitating localized placement of the solder prior to reflow processing without masking or other additional processing steps.
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