If PCB design allows, it should design with wire looping (NPTH) requirements and stake the wire to ensure the reliability.

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From: [log in to unmask] <[log in to unmask]>
Date: 4 March 2022 at 10:18:17 PM SGT
To: [log in to unmask] <[log in to unmask]>
Subject: [TN] stranded wire assembly to PCB

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
t +1 215 698 6390
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