What is a 1X012 device?
c p wrote 03/17/2024 at 12:30 • 0 pointsHi, I'm trying to revive an old board that contains several 1X012 devices, of which I cannot find any information. The devices have a TO-92 housing and the multimeter showed a double diode configuration with common kathode, which implied to me that it is either that or a pnp-type transistor. I managed to redraw the schematics, which gave me somewhat the suggestion that it indeed is a double diode component, but I'm somewhat reluctant to believe that as a) the board is from the late 60's/early 70's and I don't think integration had already reached that level and b) on other boards from that family circuits having OR-gates built around diodes used separate diodes for that and not this integrated part.
Does anyone have a clue on what this component might be? Any help would be very much appreciated!
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One thing you could try. Remove one from the circuit and test it with one of those cheap ($10 or so) component checkers.
They are surprisingly good at figuring out roughly what you are dealing with.
Just paste this word salad in to the ebay search box if you are not sure what I'm referring to.
"All-in-1 LCD Component Tester Transistor Diode Capacitance ESR Meter Inductance"
Are you sure? yes | no
A capacitor on the suspected cathode/base pin would make it more likely a transistor, probably serving as a coupling capacitor. Capcitance would be unwanted there, if it is a logic element. Germanium diodes and transistors started to appear in consumer products in the mid 1950's. Even today a double diode is still the lowest cost single gate solution. Also be aware that you may be looking at a circuit that has a positive ground, they used to do that back then.
Two more possibilities came up when I was attempting to dissect your part number, JFET and varactor. The JFET would read like a double diode when forward biased. A varactor would very likely have a series capactior on one of the anode terminals.
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