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Author Topic: Identify ITT diode  (Read 1548 times)

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Offline rdaggerTopic starter

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Identify ITT diode
« on: September 14, 2018, 03:13:15 pm »
I'm trying to identify a diode.  The only markings are ITT.  It looks like a 1N4004, but it has a very low voltage drop of around .23V.  It was in a full wave rectifier circuit.  The date codes on the board are between 1977 and 1978.
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Offline Benta

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Re: Identify ITT diode
« Reply #1 on: September 14, 2018, 04:03:19 pm »
Could be a Schottky, something like a 1N5819. But if you measure forward voltage, you need to put something like 100 mA through the diode to get a meaningful result.

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Offline rdaggerTopic starter

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Re: Identify ITT diode
« Reply #2 on: September 14, 2018, 05:35:25 pm »
I retested by placing the diode in series with a 0.5A lamp.  The voltage drop climbed to 0.35V.
The same circuit with a 1N4005 showed a voltage drop of 0.82V
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Offline Benta

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Re: Identify ITT diode
« Reply #3 on: September 14, 2018, 08:58:59 pm »
Well, Schottky then.
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