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Subject: Re: Relay contact replacement

Date: 04/25/00 at 7:58 AM
Posted by: John Dunn - Consultant
E-mail: ambertec@ieee.org
Message Posted:

In Reply to: Relay contact replacement posted by Francis L'Heureux on 04/17/00 at 2:59 PM:

Hello, Francis.

I think we need more specific information. A set of relay contacts, or a MOSFET, would only
be capable of switching up to some maximum amperage and neither of them is inherently
short circuit protected. Also, is the load resistive, inductive, a bit of both or is it incandescent
lamps and if it is lamps, what kind of input current surges will tney draw?

My first impulse is to suggest you look at the MOC series of optocouplers which originated
at Motorola and are now available, I believe, from ON Semiconductor at:

http://www.onsemi.com/home/

Since those folks also make TMOS power mosfets. they should be able to give you some good
advice for your particular application.

Good luck.

John Dunn - President
Ambertec, Inc.
ambertec@ieee.org


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