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November 1997

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Date:
11/10/97 8:13 PM
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Poh,
If you are putting TSOPs on FR-4 and temperature cycle them you are
going to have problems, no matter how good your joints look.  The
thermal coefficient of expansion mismatch between the part and board is
so great that you will quite often find that the TSOPs will "unzip"
their joints along one entire side!

Bev Christian
Nortel

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