We have a sole source for  TSOP components, in which, they are only
available with alloy 42 leads. The vendor refuses to build the parts with
Copper leads because the  CTE of alloy 42 better matches the die CTE and as
result they have fewer component failures and defects.

Does any one know of a PWB material that would better match the CTE of alloy
42 leaded TSOPs?

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