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Author Topic: PN3500 Diode by Motorola  (Read 282 times)
W6EM
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Posts: 1642




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« on: November 16, 2017, 02:28:01 PM »

Anybody over here know what these are?  They're not a plastic version of a 1N3500 1/2W zener......

Higher than normal Vf of about 0.77V.  Are they PIN diodes?
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W9IQ
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« Reply #1 on: November 16, 2017, 02:42:08 PM »

If you mean MPN3500, it is a 35 volt, 400 mA PIN diode with 2 pF at 20 volts.

- Glenn W9IQ
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- Glenn W9IQ

I never make a mistake. I thought I did once but I was wrong.
W6EM
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Posts: 1642




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« Reply #2 on: November 16, 2017, 05:43:34 PM »

Thanks much, Glenn.  That's probably what they are.  The case only had "PN3500" printed on it, so I was led astray.

Will be interesting to tinker with them and see what the capacitance would be with VR at 13V.  No idea where they came from.  Probably from a $1 a pound bin from an old surplus store in Santa Clara years ago.

73.

Lee
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AC5UP
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« Reply #3 on: November 16, 2017, 06:13:45 PM »

I have a stash of various parts I've picked up over the years that includes a few dozen transistors marked " PN2222 "...........  PN as in part number.

They're generic 2N2222's that for whatever reason are generically marked and it wouldn't surprise me if your diodes have a similar origin.
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W6EM
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« Reply #4 on: November 16, 2017, 07:46:59 PM »

I have a stash of various parts I've picked up over the years that includes a few dozen transistors marked " PN2222 "...........  PN as in part number.

They're generic 2N2222's that for whatever reason are generically marked and it wouldn't surprise me if your diodes have a similar origin.
Nope.  Already tried that angle.  A 1N3500 is a 1/2W, 6.1V zener. (Maybe why they were in my zener drawer.  Can't remember testing them before)

I spent a few minutes verifying that when reverse biased, no zener knee at 6.1V.

And, the cases aren't plastic.  They will now go into the right subject matter drawer......

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