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From: peterb@pbear.UUCP
Newsgroups: net.micro
Subject: Re: MOV transient protectors
Message-ID: <59@pbear.UUCP>
Date: Sat, 23-Feb-85 04:21:30 EST
Article-I.D.: pbear.59
Posted: Sat Feb 23 04:21:30 1985
Date-Received: Wed, 27-Feb-85 05:15:35 EST
Lines: 55
Nf-ID: #R:brl-tgr:-843500:pbear:27000002:000:1586
Nf-From: pbear!peterb    Feb 22 14:05:00 1985


	Most MOVs are designated both by peak current and NOMINAL voltage
	These devices work for both AC and DC. (AC devices will last
	longer though).

	If you hooked up MOVs at the feed box for the house, it would
	protect from the outside disturbances, but not inside transients.

	If you want to protect logic, I recommend tranzorb devices
	by GS (general semiconductor), specifically the

		1N5908

	This devices charecteristics are:

		1.5Kw Peak Pulse Power dissipation @ 25 deg c
		Tclamp (0 V to BVmin) < 1 pecoseconds! (theoretical)
			(can not measure it if < 3 picoseconds)
		Forward Surge rating (1/2 cycle):
			200amps, 1/120 second @ 25 deg c
		Steady State power dissipation:
			5W @ 75 deg c, lead length 3/8 inch
		Repitition rate (duty cycle):
			.05%

	It comes in a molded case, (9.4mm X 5.08mm)

		Clamping voltage is 7.2 volts, and rises only slightly
		to ~ 8 volts @ 100v and rises slightly beyond. This is
		unlike MOVs that may rise to quite higher than the
		nominal voltage indicated.


	10Kpf capacitance, reducable to 200pf by schottky diode in series,
	1KA @ 7.2 V

	This is only one of the diveces GS makes, and this is intended
	for logic protection. Originally designed for MIL work to protect
	from nuke EMP, these devices work quite well.

	for mor info, write GS for a catalog:

		General Semiconductor Industries, Inc.
		2001 West Tenth Place
		Tempe, Arizona 85281
		(602) 968-3101


	This is not an endorsment of mine, however, a friend does endorse
	them.

					Peter Barada
					ima!pbear!peterb

PS      cost of that little gem is about 75 cents!