Subject: | |
From: | |
Reply To: | TechNet E-Mail Forum. |
Date: | Wed, 6 Jan 1999 11:19:23 -0800 |
Content-Type: | text/plain |
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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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