Do the leads HAVE to be clinched? If they are being inserted
        just prior to the wave operation, leaving them straight through
        might eliminate some of the potential for bridging.

        If they must be clinched, are they being clinched by hand?  If
        so, have the operator trim the leads to no more than the pad
        perimeter.

        Jan Pelchat


______________________________ Reply Separator _________________________________
Subject: [TN] Solder Shorts on Radial Transistors
Author:  Aric parr <[log in to unmask]> at 0UTG0ING
Date:    8/25/98 3:44 PM


I have a problem with TO 92 transistor leads shorting during wave solder.
They are radial inserted with a 45 degree clinch. The short is between the
two leads clinched in the same direction. Rotating the board 180 degrees
reduces the problem, but other layout issues make this impossible (shorts
appear somewhere else). We cannot change the clinch direction. Wave
parameters were adjusted within available limits (between reflowing top
side smd during wave soldering and thermal shocking the chip caps on the
bottom). Wave height was adjusted between flooding and unsoldered SMD. Very
little effect.

Does anyone have any suggestions as to pad design, hole design, wave solder
adjustments, clinch geometry... that I can try?

ARIC PARR
Sr. Manufacturing Engineer
Eaton Corp
1400 S. Livernois
P. O. Box 5020
Rochester Hills, Mi 48308-5020
[log in to unmask]
248 608 7780
Fax: 248 656 2242

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