A vendor of mine attempted to wire bond using aluminum wire to a
component with silver leads.  This seems to have resulted in an
unstable circuit due to poor bond connections.  The circuit is a
precision oscillator that is very sensative to phase noise and 
frequency shifts.  We have seen that bonds have been failing bond
pull at very low levels (.6g to 1.6g) and that multiple attempts
have to be made to get any bonds to stick at all (11 attempts to get
2 bonds, both of which failed at under 2.6g).

Q: What are the risks and problems associated with using aluminum
wire bonds to a silver contact?

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