Aloha, fun & authoritative answers -- no cost, no registration, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Where the
world gathers for metal finishing
Q&As since 1989

-----

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

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: