ACC Board transistors

[batterzazu]

HI I have a Series one and am looking for the part number for the power transistors on the Acc board. It would be great if some one knew the generic "2N" number.

Scott

[HillBilly]

I take it you are refering to the red labeled Delco GM DTS-411 or 503-524's. I have seen them replaced with IR 431 from International Rectifier.

Darek

[lloydsp]

[QUOTE=batterzazu;552614]HI I have a Series one and am looking for the part number for the power transistors on the Acc board. It would be great if some one knew the generic "2N" number.



---------

IR and Motorola, and a few others, make many power devices that do not follow the "2N" traditional transistor numbering. Partly, I think this is due to the fact that most of the IR parts are NOT transistors -- they're "smart" ICs with the function of a transistor. "Smart" is in the sense that they self-protect, have more linear Hfe functions, and tend to be more reliable than discrete semiconductors.

IR makes some of the nicest "smartFETs" in the world. You can't hardly burn them out intentionally.

LLoyd

[batterzazu]

Thank you for your response. I thought they were just transistors, that would be why my local electronic surplus supply store has no idea where to find these.



Scott

[lloydsp]

[QUOTE=batterzazu;553787]Thank you for your response. I thought they were just transistors, that would be why my local electronic surplus supply store has no idea where to find these.

----------------

Actually, the IR-431 suggested by another earlier (IR-4310??) isn't a "smart" power device, although it is a bit more than just a transistor.

That one is a "HexFET", which is basically an IR-proprietary die geometry power-FET, but with an integral flyback diode.

It's a bit "smarter" than a bare FET would be, but not by much.

There are a whole raft of suitable devices in newer technologies that can be used as generic replacements for older power transistors. You just need to track down the device specs for the old ones -- the rest is easy.

LLoyd

[lloydsp]

Originally Posted by lloydsp Actually, the IR-431 suggested by another earlier (IR-4310??) isn't a "smart" power device, although it is a bit more than just a transistor. LLoyd

------------
It's ALSO probably not a suitable replacement for a Delco DTS-411. Here are the DTS-411 specs:

DTS411
Si NPN Power BJT

V(BR)CEO (V)=300
V(BR)CBO (V)=300
I(C) Abs.(A) Collector Current=3.5
Absolute Max. Power Diss. (W)=100
I(CBO) Max. (A)=250u
h(FE) Min. Static Current Gain=30
h(FE) Max. Current gain.=90
@I(C) (A) (Test Condition)=1.0
@V(CE) (V) (Test Condition)=5.0
f(T) Min. (Hz) Transition Freq=2.0M
Package=TO-3
Military=N

As you can see, it's a 'plain vanilla' silicon power transistor. Gots pretty high collector-emitter breakdown voltage, but pretty low I(C) rating.

You'll find plenty of transistors that operate in that regime.

LLoyd

[HillBilly]

Well I have two of these ACC boards that have them installed. Granted one is a spare but the other is out of a working control so I know they will work.

These are also the predrive transistor on the SMD boards.

Darek

[lloydsp]

Originally Posted by HillBilly Well I have two of these ACC boards that have them installed. Granted one is a spare but the other is out of a working control so I know they will work. These are also the predrive transistor on the SMD boards. Darek

THAT's why I said "probably not suitable". I couldn't find any references to the IR-431, only the 4310. The 431 might be an NPN. Even the datasheet archives didn't have it.

LLoyd