Author Topic: matte tin pin contact with ENIG PCB  (Read 2164 times)

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Online Alex EisenhutTopic starter

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matte tin pin contact with ENIG PCB
« on: November 01, 2019, 03:45:17 am »
Good day!
Samtec OPP connector
http://suddendocs.samtec.com/catalog_english/opp.pdf
As you can see these are spring-formed matte-tin-plated pins that mate to a pad on another PCB.
They say it should mate to a tin-plated pad.
Page 3:
http://suddendocs.samtec.com/prints/opp-xx-01-x-s-x-xx-footprint.pdf

So what happens if the pad is ENIG instead? Will the Sun go red giant? Will Jupiter turn into a quasar?

Will there be some kind of tin-gold intermetallic shenanigans ??

Samtec says this is "not recommended" and won't tell me more than that. Unfortunately the mating board is already done, it's ENIG.
Hoarder of 8-bit Commodore relics and 1960s Tektronix 500-series stuff. Unconventional interior decorator.
 

Online wraper

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Re: matte tin pin contact with ENIG PCB
« Reply #1 on: November 01, 2019, 04:54:45 am »
Likely you will start having contact failures after few months to years.
Quote
Unfortunately the mating board is already done, it's ENIG.
Then tin the pads and thoroughly clean from flux. Although I don't advise using connectors of such style (springy) in non gold plated variants. If you want to go with tin, use connectors which strongly bite into solder on the pad. Such as commonly used in HDDs.
 
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Online Alex EisenhutTopic starter

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Re: matte tin pin contact with ENIG PCB
« Reply #2 on: November 01, 2019, 11:36:01 am »
Yeah this connector wasn't my choice, I did leave paste on the mating pads and when the boards got assembled I got an earful when my boss saw the solder.
I guess it's a wait and see thing now...  :-//
Hoarder of 8-bit Commodore relics and 1960s Tektronix 500-series stuff. Unconventional interior decorator.
 


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