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Subject:	AW: Strain or strain rate spec for PCBAs
From:	Torsten Hagge <[log in to unmask]>
Reply To:	TechNet E-Mail Forum <[log in to unmask]>, Torsten Hagge <[log in to unmask]>
Date:	Wed, 25 Aug 2021 21:04:12 +0000
Content-Type:	text/plain
Parts/Attachments:	text/plain (25 lines)

Hello Raye,

automotive standard is maximum 1000µm/m, VW recommends 500µm/m max stress on PCBA line, depanelization is the worst, but some (AOI) PCB fixing systems are critical, too. 

take care,
Torsten

-----Ursprüngliche Nachricht-----
Von: TechNet <[log in to unmask]> Im Auftrag von Rivera, Raye
Gesendet: Mittwoch, 25. August 2021 21:22
An: [log in to unmask]
Betreff: [TN] Strain or strain rate spec for PCBAs

Hello Technetizens,

Does anyone know of a spec or criteria for acceptable strain or strain rate for a PCBA?

We are using strain gauges to understand how much strain is placed on a PCBA inside one of our products during typical shipping processes.

I know that IPC-TM-650, 2.4.41.2A tells how to measure coefficient of thermal expansion by this method, but I can't find anything about mechanical force, or how much is too much.

Best regards,
Raye Rivera
Quality Manager

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