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April 1997

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Subject:
Lead-bending
From:
[log in to unmask]
Date:
Thu, 3 Apr 97 12:27:37 +0200
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Lead-bending (27 lines) 
Dear technetters.

We have looked at using transistors of the TO 257 type.
The three leads to the component will be bent down in an 90 degree 
angle and be hole mounted on a pcb.
The leads are round and are tinned.
After a bend in our equipment cracks are visible in the tin layer at the
bend. 
At the soldering the tin will not be reflow at the bend.
Is this cracks OK if the equipment is intended for outdoor use?
Or do we have to reflow the leads, redesign the tool or use conformal
coating on the leads. 

Best Regards 

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