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January 1999

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Subject:
TO-92 spacing -Reply
From:
Matthew Park <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 6 Jan 1999 11:19:23 -0800
Content-Type:
text/plain
Parts/Attachments:
text/plain (85 lines) 
Tom,

This issue was diss in the forum.  Since board can not be
rotated, rotate TO-92 pkg as shown.

1. Direction thru wave ------------------->

                O                          O
                      O      or    O
                O                          O

OR you could add a robbing pad as shown
2. Direction thru wave ------------------->

          O   O   O
                   O

I am using Kester 951 as you do, I have no problem with the first
option layout.   My pad layout is smaller than the one
you mentioned with a small section cut-out on the side of two
pads facing each other as shown.

          CI     D
               O

regards
Matthew Park
Norsat International Inc.

>>> "Fawn Industries, Elm City Plant"
<[log in to unmask]> January 6, 1999  10:42 am
>>>
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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