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November 2006

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Subject:
From:
Ahne Oosterhof <[log in to unmask]>
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Date:
Mon, 20 Nov 2006 14:44:32 -0800
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From experience -- wayyyyy back ----:
Don't use solder coated pins for an interconnect, unless the number of
insertions is very, very, very low and the contact pressure is very high.
Seems unlikely in your case.

Regards,
Ahne

PS: not in my airplane!




-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kevin Glidden
Sent: Monday, 20 November, 2006 07:34
To: [log in to unmask]
Subject: [TN] Tin - Lead Solder / Gold connector interface

All,
We are using a simple header connector (pin) and receptacle (socket) to make
a board to board interconnect.  The pins and socket are gold plated over 50
u-in Nickel, base material is phospor bronze.  We normally pre-tin the tails
for soldering to the PCB, and leave the interconnect areas gold.  Operator
mistakenly tinned both ends of the pi (using water sol flux and 63/37
alloy).  This would result in a solder coated pin inside the gold plated
receptacle.  I couldn't locate anything in IPC-610 about this condition.
Will it be acceptable?  Operating voltage @ 28VDC.  Avionics application.
TIA,
Kevin Glidden
Manufacturing Engineer
Astronics Luminescent Systems Inc.


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