Jack
We are just now running cryogenic tests on a space application. PCB is standard FR4 (those guys seem to be short on money), components are space approved, SnPb solder. Cycle runs from -130°C to +70°C, gradient 3-4°C/min, dwell 1h, 300 cycles. Only problem we saw where cracks in the molding of the sub 9 connectors. I think an important  problem occurring at low temperature is the combination with vibrations due to embrittlement.

Best regards

Günter 


> -----Ursprüngliche Nachricht-----
> Von: TechNet [mailto:[log in to unmask]] Im Auftrag von Jack Olson
> Gesendet: Mittwoch, 1. Juni 2016 19:36
> An: [log in to unmask]
> Betreff: [TN] FR4 in COLD environments
> 
> Has anyone ever heard anything about the reliability of circuit boards in cold
> environments?
> (continuous -40C)
> I couldn't find anything on TechNet or in the Printed Circuits Handbook...
> 
> thanks,
> Jack
> 
> 
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