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Selective Tin-Lead Plate over ENIG

2003

BACKGROUND: Install press-fit connectors in backplanes (a circuit board .100-.200+ thick) finished with Immersion Gold/Electroless Nickel (ENIG). One particular connector comes only in gold finish (instead of the normal Sn-Pb) which creates more friction when ENIG is used. Tin-Lead Plate is ideal, except copper migration through the tin-lead creates problems with the surface mount parts on the back plane.

My question is, "Does anyone have experience with a selective tin-lead plate over ENIG?" It would meet our needs, but may not be possible.

Thanks,

Douglas Corbett
CM - PCBs - Salt Lake City, Utah, USA

October 11, 2008

I have built boards with similar a similar process.

Copper plate.
Electrolytic Nickel plate.
Tin Lead Plate.

Jesus Gasca
- San Jose, California, USA

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