De:   Coderre - JCCODERR BRMVM1
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CLASSIFICATION    NON-CLASSIFIE ( )       CONFIDENTIEL ( )
Objet:   BGA finish

Typically we talk of 5-10 microinches of gold. This is a self-limiting
process with the upper limit being in this range. The 3-5 is indeed
too tight and may represent a given immersion gold process. As for
wire bonding, the boards would typically go through an additionnal
"true electroless" gold process, depositing a minimum of 20 microinches.
Two different gold thicknesses means one needs a compatible masking
process which we are presently introducing for some of our customers.

Merci/Regards
Directeur Ingenierie MLC / MLC ENG. MGR
Dept 881/23 BRMT (tel. 514-534-6591, US tieline 552)
INTERNET ADDRESS [log in to unmask]
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