Thanks for the response. Does “common” mean there is a specification or is it just common good practice? I am trying to create inspection criteria for assemblies that we designed many years ago and still procure. Quality is inconsistent because notes are not clear as to how to strap and tack wires.
From: Wayne Thayer <[log in to unmask]>
Sent: Saturday, March 5, 2022 4:55 PM
To: TechNet E-Mail Forum <[log in to unmask]>; Thierolf, Chris (US) - MAR <[log in to unmask]>
Subject: [EXTERNAL] Re: [TN] stranded wire assembly to PCB
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Hi Chris-
One common way of doing this is to add some unplated holes to create a wire clamp and strain relief loop. The wire goes through the unplated hole and then loops over to the SMT contact or plated hole. Usually a dot of glue or RTV is added to lock the wire into the unplated hole.
Wayne THayer
On Fri, Mar 4, 2022 at 6:17 AM <[log in to unmask]<mailto:[log in to unmask]>> wrote:
Does anyone have recommendations for best assembly practices when soldering 28-30awg stranded wire directly to PCB PTHs? There seems to be high risk for fatigue and wire break above the solder joint that would make this assembly process unreliable. I have seen solderable crimp pins used but those tend to add vertical height off the PCB that can be an issue in low profile applications. Stress relief and wire staking can help to stabilize the wire to prevent breakage, but this can also be difficult in densely populated areas on the board.
Chris Thierolf
Senior Specialist, Electrical Engineer
Integrated mission systems / L3HARRIS TECHNOLOGIES
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