Author Topic: Unknown ID of TO-18 transistor  (Read 796 times)

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Offline Cliff MatthewsTopic starter

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Unknown ID of TO-18 transistor
« on: May 20, 2019, 12:01:23 am »
Scored a bag of 100 NOS gold lead TO-18 PNP transistors for 50-cents, but can't find the specs anywhere. Sorted them on the transistor tester all are fine (they're SI and HFE's score from 100 to 250).  Any hunches on a Motorola 3-093 026  ??
 

Offline bob91343

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Re: Unknown ID of TO-18 transistor
« Reply #1 on: May 20, 2019, 02:00:34 am »
I have no definitive information but I would guess they are silicon high frequency units, perhaps 25 to 40 Volt rating.  You can use them for casual, uncritical purposes.  With that many of them you can have some fun building circuits.  In fact if you build a high frequency oscillator you can discover if it's a high frequency transistor.  Failing that, you can simply drive it with a fast pulse and see how much it degrades the rise time.

I have many drawers full of unmarked transistors and others with strange markings.  I use them here and there as general purpose units.  Some are extremely high gain Darlington types.  Lots of PNP and NPN.  Most are the little plastic half round, I think TO-92 or something.

I scavenge parts from defunct equipment such as monitors and computers and so on.  It's amazing how useful those parts can be.  Great rectifiers as well, capacitors, flame proof resistors, relays, LEDs, the list is long and my storehouse overflowing.  Most of them are numbered and I can look them up on the web but not all.
 
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Offline Neomys Sapiens

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Re: Unknown ID of TO-18 transistor
« Reply #2 on: May 21, 2019, 02:09:02 am »
That number is not necessarely a Motorola designation. Even if the number does not produce any hits, compare the number structure with known number systems, such as ECG, Tektronix, HP, IBM..
That might give you an idea whose part that really is.
 
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