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January 1999

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Subject:
From:
"Fawn Industries, Elm City Plant" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 6 Jan 1999 13:42:31 -0500
Content-Type:
text/plain
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text/plain (34 lines)
Techies,

I have a PCB that uses 30-40 T0-92 transistors.  My problem is that when I
wave solder these PCB's, the majority of them have solder bridges.  I
believe the pad-pad spacing ( 0.5mm) is the problem.  Lead protrusion is
1mm, pad size 1.4mm.

Direction thru wave ------------------->

                O   O
                   O

Soldering   200-210F until 490F at wave -Tried temp increase
Conveyor speed 4.2ft/min - Tried faster and Slower
Cannot rotate PCB
Have to use NOclean flux - Kester 951

I would like to know what is usually recommended or what some of you use at
your companies.  Any help would be greatly appreciated.

Tom B.

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