Recent Topics
Be careful what you wish for...
by Shannow. 09/20/18 04:40 AM
Debating repowering my tower.
by Colt45ws. 09/20/18 01:10 AM
Oil filter for GM 8.1l V8?
by KenO. 09/19/18 11:10 PM
Help! No high beam
by wolf_06. 09/19/18 11:02 PM
Heading for divorce
by barkingspider. 09/19/18 11:02 PM
Oil recommendation: 1991 Nissan D21 truck
by RDY4WAR. 09/19/18 10:04 PM
Cold starting and CCS etc.
by CT8. 09/19/18 10:03 PM
Whine->Dead car(electrical)
by madRiver. 09/19/18 09:59 PM
Differential Allen Drain Bolt Buggered
by Gebo. 09/19/18 09:41 PM
Pick my oil. 25k miles a year
by Serge. 09/19/18 09:41 PM
Ok to use in Kubota? Pennsoil 0w-40
by racinjason. 09/19/18 09:35 PM
Road Hugger GTP A/S Tires
by Bud_One. 09/19/18 09:16 PM
Gravity Bleeding Clutch?hel
by Spetz. 09/19/18 09:10 PM
Drunken Watch?
by StevieC. 09/19/18 09:01 PM
New Forum Member New Truck Owner
by FarmerDude. 09/19/18 08:35 PM
Valvoline DOT 3/4?
by DJ. 09/19/18 08:22 PM
Best grease for AWD actuator disconnect?
by Bman90. 09/19/18 08:14 PM
Reconditioning a 2-Stroke Snow Blower
by Finz. 09/19/18 07:55 PM
Liquimoly Anti Friction - $6.83 Shipped/ Can
by ad244. 09/19/18 06:57 PM
ACEA spec for old Toyota??
by alexmarjanovic98. 09/19/18 06:54 PM
Newest Members
FarmerDude, Bman90, Alday714, Joephoto, tlelectric
66021 Registered Users
Who's Online Now
55 registered members (Benzadmiral, Bailes1992, BAJA_05, advocate, alarmguy, Bandito440, 4 invisible), 917 guests, and 43 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics290,699
Posts4,848,505
Members66,021
Most Online3,590
Jan 24th, 2017
Donate to BITOG
Previous Thread
Next Thread
Print Thread
Hop To
Transistor with 8720 on it. #4694021
03/13/18 09:50 PM
03/13/18 09:50 PM
Joined: Apr 2004
Posts: 3,662
los angeles
daves66nova Offline OP
daves66nova  Offline OP
Joined: Apr 2004
Posts: 3,662
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.

Last edited by daves66nova; 03/13/18 09:52 PM. Reason: added on

THIS SPACE FOR RENT, PLEASE PM ME.
Re: Transistor with 8720 on it. [Re: daves66nova] #4694027
03/13/18 09:58 PM
03/13/18 09:58 PM
Joined: Jan 2009
Posts: 282
San Diego, California
Jim_Truett Offline
Jim_Truett  Offline
Joined: Jan 2009
Posts: 282
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?


2008 F250 6.4 PowerStroke 43k
2005 Honda CR-V 193k
2005 Honda Pilot 235k
1963 Nova SS 84k
2015 Civic Si 23k
2013 Mahindra 3016HST 99hrs
Re: Transistor with 8720 on it. [Re: daves66nova] #4694032
03/13/18 10:01 PM
03/13/18 10:01 PM
Joined: Apr 2004
Posts: 3,662
los angeles
daves66nova Offline OP
daves66nova  Offline OP
Joined: Apr 2004
Posts: 3,662
los angeles
Ok. That T0-3 is also important?


THIS SPACE FOR RENT, PLEASE PM ME.
Re: Transistor with 8720 on it. [Re: daves66nova] #4694034
03/13/18 10:04 PM
03/13/18 10:04 PM
Joined: Jan 2009
Posts: 282
San Diego, California
Jim_Truett Offline
Jim_Truett  Offline
Joined: Jan 2009
Posts: 282
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.


2008 F250 6.4 PowerStroke 43k
2005 Honda CR-V 193k
2005 Honda Pilot 235k
1963 Nova SS 84k
2015 Civic Si 23k
2013 Mahindra 3016HST 99hrs
Re: Transistor with 8720 on it. [Re: daves66nova] #4694051
03/13/18 10:12 PM
03/13/18 10:12 PM
Joined: Apr 2004
Posts: 3,662
los angeles
daves66nova Offline OP
daves66nova  Offline OP
Joined: Apr 2004
Posts: 3,662
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?

Last edited by daves66nova; 03/13/18 10:15 PM. Reason: Added on

THIS SPACE FOR RENT, PLEASE PM ME.
Re: Transistor with 8720 on it. [Re: daves66nova] #4694098
03/13/18 10:58 PM
03/13/18 10:58 PM
Joined: Sep 2015
Posts: 1,523
USA
mk378 Offline
mk378  Offline
Joined: Sep 2015
Posts: 1,523
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.

Re: Transistor with 8720 on it. [Re: daves66nova] #4694201
03/14/18 03:59 AM
03/14/18 03:59 AM
Joined: Jan 2011
Posts: 2,718
N.Ohio
Lubener Offline
Lubener  Offline
Joined: Jan 2011
Posts: 2,718
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.

Last edited by Lubener; 03/14/18 04:03 AM.

The "thinking" man's friend.
Re: Transistor with 8720 on it. [Re: daves66nova] #4694292
03/14/18 08:07 AM
03/14/18 08:07 AM
Joined: Jan 2012
Posts: 414
hawthorne, Ca.
46Harry Offline
46Harry  Offline
Joined: Jan 2012
Posts: 414
hawthorne, Ca.
If you can't find a 2N5884, the NTE cross reference is either an NTE #30 or NTE #180 for audio use.

Re: Transistor with 8720 on it. [Re: daves66nova] #4694319
03/14/18 08:37 AM
03/14/18 08:37 AM
Joined: Jan 2009
Posts: 282
San Diego, California
Jim_Truett Offline
Jim_Truett  Offline
Joined: Jan 2009
Posts: 282
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?


2008 F250 6.4 PowerStroke 43k
2005 Honda CR-V 193k
2005 Honda Pilot 235k
1963 Nova SS 84k
2015 Civic Si 23k
2013 Mahindra 3016HST 99hrs
Re: Transistor with 8720 on it. [Re: daves66nova] #4694325
03/14/18 08:41 AM
03/14/18 08:41 AM
Joined: Jun 2015
Posts: 4,225
New England
Virtus_Probi Offline
Virtus_Probi  Offline
Joined: Jun 2015
Posts: 4,225
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).


2014 Forester XT, 86000 miles
Last Change;
M1 5W30 d1G2
Tokyo Roki 15208AA170 filter
Re: Transistor with 8720 on it. [Re: daves66nova] #4694494
03/14/18 11:30 AM
03/14/18 11:30 AM
Joined: May 2013
Posts: 2,093
Saskatchewan, Canada
Johnny2Bad Offline
Johnny2Bad  Offline
Joined: May 2013
Posts: 2,093
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.


'57 FL Straight 50 wt
'90 Miata 1.8L w/Rotrex Supercharger [Mobil1 0W-40]
'96 Ram 1500 [3.7L Mobil1 0W-20 / 1L 15W-50]
'01 PT Cruiser [Mobil1 0W-40]
Re: Transistor with 8720 on it. [Re: daves66nova] #4694519
03/14/18 11:58 AM
03/14/18 11:58 AM
Joined: Apr 2004
Posts: 3,662
los angeles
daves66nova Offline OP
daves66nova  Offline OP
Joined: Apr 2004
Posts: 3,662
los angeles
Ok, just ordered some from digikey


THIS SPACE FOR RENT, PLEASE PM ME.

BOB IS THE OIL GUY® Powered by UBB.threads™