Electronics > Beginners
What is a SILISTOR ?
BravoV:
--- Quote from: ArthurDent on October 30, 2018, 02:51:02 am ---It looks like an old high power silicon carbide varistor (MOV)
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Looks really similar, but this Silistor has 3 terminals, while that MOV even has the similar 2 red discs sandwiched, still its a 2 terminals device as the outer clamping metals are connected.
BravoV:
--- Quote from: T3sl4co1l on October 30, 2018, 09:56:02 am ---Strange that it would have voltage and current ratings, like maybe it's a current limiting device.
I don't know how old the usage is, of the silicon PTC term. This is, I guess, 60s or 70s Japanese, so it's probably hard finding references over here to begin with, let alone online...
Would be strange to have a PTC, that's three terminal, and suitable for some power I would guess. It's not a polyfuse style device -- if it is a PTC, it's not that kind, but a softer slope (R roughly PTAT).
Some electrical tests should tell what it is, or at least hint at it.
Tim
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Tim, any hint what or how to test ?
Most thermal sensor (non active component/semiconductor) devices have only 2 terminals right ?
MK14:
--- Quote from: T3sl4co1l on October 30, 2018, 09:56:02 am ---Would be strange to have a PTC, that's three terminal
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If you look carefully at the picture, it has two terminals each. But there are apparently two of the PTC (or whatever it is) devices, sharing one terminal, common to both of them.
Maybe they have different temperature settings (coefficients etc), between the two PTCs, so that it can be used to regulate the temperature of something, between two set points, or something.
I.e. one temp for turn on, another temp (i.e. hysteresis between them) to turn back off again.
But there are thousands of other speculative options at this point.
glarsson:
Very large for a temperature sensor. Why make it this large and have to wait hours for a reading?
ArthurDent:
SILIcon carbide variSTOR or what we call today an MOV. These large bulk ones were first made by GE for industrial use and the smaller ones that look like an orange disc capacitor followed for use in equipment for home use. The disks could be wired in parallel for higher surge capacity like the one I showed above or could be used on a house split 240 VAC to have one from each 120 line to neutral like the 3 wire one shown in the first photo. There are large ones still used on power poles near transformers and look like tall finned insulators. Here's another photo of one with 2 leads and one with multiple connections.
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