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Date: | Mon, 24 Jun 96 07:59:55 CST |
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DJR,
IN A PREVIOUS INCARNATION I DID DESIGNS FOR A SIMILAR ENVIROMENT.
YOU DIDN'T SPECIFY WHAT KIND OF WIRE; INSULATED, STRANDED,
UNINSULATED, ETC. IF IT'S AN INSULATED STYLE WIRE I WOULD RECCOMEND
USING TERMINALS OR CONNECTORS TO MOUNT IT. IT SOUNDS AS IF THE HEAT
APPLIED TO MELT THE SILVER SOLDER IS CAUSING A THERMAL SHOCK TO THE
HOLE. MAKE SURE YOU HAVE PADS ON ALL LAYERS TO SUPPORT THE HOLE AND
MAKE SURE THE ASSEMBLER DOESN'T TOUCH THE BOARD WITH THE SOLDERING
IRON. IF IT'S A WIRE FOR WIRE BONDING I'M ALL OUT OF SUGGESTIONS.
ROBERT BUTTERWORTH
SR PWB DESIGNER
ADC VIDEO SYSTEMS
11 FARFIELD BLVD
WALLINGFORD, CT
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Subject: High Temp PCB
Author: [log in to unmask] at internet-mail
Date: 6/21/96 8:55 PM
I currently have a customer with an application requiring a 6 layer PCB
that must exist in a 120 degrees C environment. They are currently using
silver solder to attach wires to the PCB, and the holes are failing. Did I
mention there is also a lot of vibration?
Does anyone know of a successful fab stategy, i.e. PCB laminate, plating
and soldercoat combination that can successfully survive these conditions?
We have been considering using rivets in the holes as a parallel solution.
All comments are welcome.
djr
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