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#4694021 - 03/13/18 09:50 PM Transistor with 8720 on it.
daves66nova Offline


Registered: 04/11/04
Posts: 3652
Loc: los angeles
I need 2 transistors, like this, Transistor the number on top is 2N5884, under that it says MEX then under that 8720. Does the 8720 matter? I dont know anything really about electronics, so I dont know exactly what I need, I'm just going by the part no. It also has the Motorola symbol above everything.


Edited by daves66nova (03/13/18 09:52 PM)
Edit Reason: added on
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#4694027 - 03/13/18 09:58 PM Re: Transistor with 8720 on it. [Re: daves66nova]
Jim_Truett Offline


Registered: 01/07/09
Posts: 277
Loc: San Diego, California
2N5884 is what is important. The 8720 is most likely the 20th week of 1987 for manufacture date. Buy from a reputable house like Mouser or Digikey . A picture of the original would help just to be sure of the case type, but it looks like T03. Also, what is the circuit? Do they need to be a matched pair?
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#4694032 - 03/13/18 10:01 PM Re: Transistor with 8720 on it. [Re: daves66nova]
daves66nova Offline


Registered: 04/11/04
Posts: 3652
Loc: los angeles
Ok. That T0-3 is also important?
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#4694034 - 03/13/18 10:04 PM Re: Transistor with 8720 on it. [Re: daves66nova]
Jim_Truett Offline


Registered: 01/07/09
Posts: 277
Loc: San Diego, California
Originally Posted By: daves66nova
Ok. That T0-3 is also important?


Certainly, if it mounts to a heatsink. Fortunately it seems to be available in only T0-3 and T0-204 which are similar.
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#4694051 - 03/13/18 10:12 PM Re: Transistor with 8720 on it. [Re: daves66nova]
daves66nova Offline


Registered: 04/11/04
Posts: 3652
Loc: los angeles

The circuit board is detached from where it goes onto.I burned a few resistors as shown on top left. If these trans. were bad, then it would allow the resistors to burn?


Edited by daves66nova (03/13/18 10:15 PM)
Edit Reason: Added on
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#4694098 - 03/13/18 10:58 PM Re: Transistor with 8720 on it. [Re: daves66nova]
mk378 Offline


Registered: 09/27/15
Posts: 1414
Loc: USA
If you buy a 2N5884 it will be the same shape. The package is part of the 2N number specification.

Transistors usually fail shorted and this is prone to damage other parts.

What does the board do? And yes it was made in 1987, 30 years ago.

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#4694201 - 03/14/18 03:59 AM Re: Transistor with 8720 on it. [Re: daves66nova]
Lubener Offline


Registered: 01/22/11
Posts: 2574
Loc: N.Ohio
Originally Posted By: daves66nova
Ok. That T0-3 is also important?

TO3 refers to the case style.Mounting is important if it is going on a heatsink. Out of circuit, you can easily check for shorts between base, emitter and collector(case)with an ohm meter. Those almost always short and very rarely open between junctions.


Edited by Lubener (03/14/18 04:03 AM)
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#4694292 - 03/14/18 08:07 AM Re: Transistor with 8720 on it. [Re: daves66nova]
46Harry Offline


Registered: 01/08/12
Posts: 406
Loc: hawthorne, Ca.
If you can't find a 2N5884, the NTE cross reference is either an NTE #30 or NTE #180 for audio use.

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#4694319 - 03/14/18 08:37 AM Re: Transistor with 8720 on it. [Re: daves66nova]
Jim_Truett Offline


Registered: 01/07/09
Posts: 277
Loc: San Diego, California
Originally Posted By: daves66nova
[img:gal:37685aa892ea495d9]
If these trans. were bad, then it would allow the resistors to burn?


It is definitely possible that if the transistor failed shorted, it would cause the supporting resistors to fail. Do you have access to a multimeter with a diode check function?
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#4694325 - 03/14/18 08:41 AM Re: Transistor with 8720 on it. [Re: daves66nova]
Virtus_Probi Online   content


Registered: 06/25/15
Posts: 3965
Loc: New England
If possible, it would be good to get ON Semi versions of these transistors as that is a lineal descendant of the old Motorola Components group.
I had a friend who worked in procurement of obsolete components for a military supplier and he told me that many parts were sold under the same number as "functionally equivalent", but they would find that one would have an ft of, say, 4MHz while an "equivalent" would be maybe 40MHz and cause the old circuit design to oscillate like crazy.
It's certainly not a given, but it's possible that ON Semi parts would have been made in the same fab as your old parts, or at least in one with a very similar process flow.

Impossible to say for sure if those resistor got burned due to the failure of those PNPs, but I'd guess that it's quite likely. Far more common for xtors to fail than resistors, active components are generally more liable to damage to passives (maybe excepting inductors and transformers).
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#4694494 - 03/14/18 11:30 AM Re: Transistor with 8720 on it. [Re: daves66nova]
Johnny2Bad Offline


Registered: 05/20/13
Posts: 1810
Loc: Saskatchewan, Canada
Just be sure to buy from a known good supplier with traceable procurement paperwork. As someone pointed out Digikey or Mouser (USA), Farnell (UK), etc.

DO NOT buy from eBay, counterfeiting of semiconductors is unfortunately part of our modern life and I strongly suggest you don't buy from other online vendors even if they are based domestically, unless you know exactly what you are doing. Sad but true.
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#4694519 - 03/14/18 11:58 AM Re: Transistor with 8720 on it. [Re: daves66nova]
daves66nova Offline


Registered: 04/11/04
Posts: 3652
Loc: los angeles
Ok, just ordered some from digikey
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