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Subject: Re: Relay Spike Protection

Date: 02/25/00 at 8:38 AM
Posted by: John Dunn - Consultant
E-mail: ambertec@ieee.org
Message Posted:

In Reply to: Relay Spike Protection posted by J.F. Woodland on 02/24/00 at 11:25 AM:

: I recently received a reply to a post I made to a newsgroup regarding a new industrial control system design I am developing. It was recommended that I use General Instrument transorbers or movistors instead of diodes or zeners across the relay coil to prevent spiking. I'm interested in investigating this option, but I'm not familiar with either component, and can't seem to find any information about them anywhere. Any advice would be helpful.

The use of ordinary diodes for relay spike protection is a common practice. TO-5 can sized relays and 1N4148 diodes are commonplace and work together very nicely. Also, some of Teledyne's devices have diodes for transient suppresion built right in side the relay case.

Still, if for some reason you wanted to use transient aborbing diodes (Tranzrobs from General Semiconductor or TVS from Microsemi), you could undoubtedly make that work too.

The URL for Microsemi, in case you haven't seen their stuff, is http://www.microsemi.com/corporate/products/tvs/overview.asp

Good luck.

John Dunn - President
Ambertec, Inc.

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