Power NPN transistor N344AB

[slampen]

Hi,
My Peugeot 406 heater blower control module ceased to work the other
day, and its power transistor is open. Must be an NPN since it is
supposed to PWM the blower motor to earth (-12V).

When searching N344* I find a lot of references to 2N344n.. (2N3440,
2N3442... etc) but not this the exact version.

I've uploaded an image of the 'fat' case here:

http://kuntigi.net/download/N344AB-1.jpg

Any suggestions to an equivalent for this..?

Thanks and Happy New Year to all

Geir

 

[slampen]

Den 01.01.2011 12:45, skrev Greegor:

I couldn't find the A or AB version of it.

Some indication comes from an earlier version of it.
Instead of an NPN power transistor it looks
like a PNP low power VHF switching transistor.
Did they change it a LOT when they went to the AB designation?

Hi

This ought to be a high power NPN transistor. The heater blower motor
is a powerful fan fused with a dedicated 40A fuse, so I suspect the
current flowing through the transistor is at least 30A at full speed.

The collector is connected to the fan and the emitter is connected to
ground. When I short-circuit collector and emitter the blower runs at
full speed.

Can it be some kind of OEM type number?

regards Geir

 

[TTman]

Den 01.01.2011 12:45, skrev Greegor:

Hi

This ought to be a high power NPN transistor. The heater blower motor is
a powerful fan fused with a dedicated 40A fuse, so I suspect the current
flowing through the transistor is at least 30A at full speed.

The collector is connected to the fan and the emitter is connected to
ground. When I short-circuit collector and emitter the blower runs at
full speed.

Can it be some kind of OEM type number?

regards Geir

Try BUW48.....

 

[slampen]

Den 01.01.2011 13:17, skrev TTman:

Try BUW48.....

Ok...

Fact or (wild) guess?

I don't want to put in something which will be fried or might fry the
CAN bus circuitry....

Geir

 

[TTman]

Den 01.01.2011 13:17, skrev TTman:
Ok...

Fact or (wild) guess?

I don't want to put in something which will be fried or might fry the CAN
bus circuitry....

Geir

can't see that you need anything special.... this one is rated at 40
amps.... there must be plenty more out there.

 

[Jamie]

I couldn't find the A or AB version of it.

Some indication comes from an earlier version of it.
Instead of an NPN power transistor it looks
like a PNP low power VHF switching transistor.
Did they change it a LOT when they went to the AB designation?

http://engisys.info/transistor.php?transistor=3213

Name: 2N344

Material of 2N344 transistor: Ge
Structure of 2N344 transistor: pnp
Maximum collector power dissipation of 2N344 transistor (Pc): 20mW
Maximum collector-base voltage of 2N344 transistor (Ucb): 5V
Maximum collector-emitter voltage of 2N344 transistor (Uce): 5V
Maximum emitter-base voltage of 2N344 transistor (Ueb): -
Maximum collector current of 2N344 transistor (Ic max): 5mA
Maximum junction temperature of 2N344 transistor (Tj): 85�C
Transition frequency of 2N344 transistor (ft): 20MHz
Collector capacitance of 2N344 transistor (Cc), Pf: 12
Forward current transfer ratio of 2N344 transistor (hFE), min/max:
22T
Manufacturer of 2N344 transistor: CSR
Case of 2N344 transistor: TO23
Application of 2N344 transistor: VHF, Low Power

http://www.datasheetdir.com/75344G+Power-MOSFETs

Jamie

 

[Jamie]

Hi,
My Peugeot 406 heater blower control module ceased to work the other
day, and its power transistor is open. Must be an NPN since it is
supposed to PWM the blower motor to earth (-12V).

When searching N344* I find a lot of references to 2N344n.. (2N3440,
2N3442... etc) but not this the exact version.

I've uploaded an image of the 'fat' case here:

http://kuntigi.net/download/N344AB-1.jpg

Any suggestions to an equivalent for this..?

Thanks and Happy New Year to all

Geir

http://www.datasheetdir.com/75344G+Power-MOSFETs

Maybe


Jamie

 

[Jon Kirwan]

http://www.datasheetdir.com/75344G+Power-MOSFETs

Maybe


Jamie

Nice catch! Shorting C and E by the OP to run the fan would
actually be shorting D and S. I think the OP needs to look
more at the base/gate drive part of the circuit, now.

Jon

 

[Jon Kirwan]

Nice catch! Shorting C and E by the OP to run the fan would
actually be shorting D and S. I think the OP needs to look
more at the base/gate drive part of the circuit, now.

Jon

.... assuming it was a TO-220/TO-247 style package.

Did the OP say?

Jon

 

[Jon Kirwan]

<snip>
... assuming it was a TO-220/TO-247 style package.

Did the OP say?

Never mind. I just looked at the posted image.

Jon

 

[TheGlimmerMan]

OP slampen: Have you tested the blower motor itself?

Do you even READ a thread EVER... at all? You stupid ****?

He showed us the failed part diagnostic, which proved the proper
function of the "blower motor itself".

Your lack of logic matches your incapacity to make "assessments" in any
other realm as well. A root cause, in fact.

Peugeot 406 chit chat says that it's common for the
blower motor itself to go out, and a bad one commonly
revives temporarily when the motor is tapped or whacked.

You still need to receive yours, obviously. *THWACK!*
Direct Hit firing solution resolved!

Oh, darn! Usenet has no "Fire for effect" mode, or you would be
vaporized by the laser from the "Real Genius" film! Or at least whopped
upside da haed with a baseball bat or ancient shillelagh.

The darndest thing though... if device number two is used, the urge to
continue beyond the first whoppin' is irresistible!

Bwuahahahahahaha!

Have you tested the blower motor itself?

You're a brainless wonder. It would be fun to open up that skull
cavity and prove it to be true.

Ever see the first episode of "Lexx"?

Bwuahahahahahahahahahahahahahahahahahahahahahaa!!!

 

[Jon Kirwan]

OP slampen: Have you tested the blower motor itself?
Peugeot 406 chit chat says that it's common for the
blower motor itself to go out, and a bad one commonly
revives temporarily when the motor is tapped or whacked.

Have you tested the blower motor itself?

The OP did write, "When I short-circuit collector and emitter
the blower runs at full speed." Which, given Jamie's earlier
comments and your additional post, looks like an N-FET and
not an NPN, where the OP was shoring D to S, not C to E.

Jon

 

[Jon Kirwan]

Hi,
My Peugeot 406 heater blower control module ceased to work the other
day, and its power transistor is open. Must be an NPN since it is
supposed to PWM the blower motor to earth (-12V).

When searching N344* I find a lot of references to 2N344n.. (2N3440,
2N3442... etc) but not this the exact version.

I've uploaded an image of the 'fat' case here:

http://kuntigi.net/download/N344AB-1.jpg

Any suggestions to an equivalent for this..?

Thanks and Happy New Year to all

Geir

I hadn't even looked at your image, but Jamie had the wisdom
to do that. I think Jamie has nailed it. If so, they are
cheap and broadly in stock. This being the cheapest I could
find quickly:

http://www.futureelectronics.com/en/Technologies/Product.aspx?ProductID=HUF75344G3FAIRCHILD9051079

To be absolutely sure before trying anything else, if you are
still worried, you may need to take a measurement at pin 1
and see what you observe regarding the driver when the system
attempts to turn the fan on and off and post the information.
Or else observe and comment what you see connected to pin 1.

But it looks as though what you have is more likely an
N-MOSFET. Particularly considering the discussion that
Greegor uncovered.

Jon

 

[TTman]

That leading '2', or lack thereof, makes a lot of difference. It's
probably a house number for whoever made the controller in the first
place.

You could try putting in a regular power NPN and hope that it works.
What makes you think it's not an N-channel FET?

If it's just a simple pwm, then NPN or N fet should work..... so long as
there's a base resistor for NPN mode.

 

[slampen]

Den 02.01.2011 14:49, skrev Greegor:

How do these things provide a low or medium speed?

I thought that the whole thing is PWM regulated. Must be above 20kHz
though becaus I have never heard an audible tone like with trains and
other heavy electric motors...

Geir

 

[Jamie]

That leading '2', or lack thereof, makes a lot of difference. It's
probably a house number for whoever made the controller in the first
place.

You could try putting in a regular power NPN and hope that it works.
What makes you think it's not an N-channel FET?

It's the second number on the package.. which is a power fet and
fits the app just fine..

I've seen inverted numbers like this many times on packages.
'

Jamie

 

[TheGlimmerMan]

How do these things provide a low or medium speed?

You asking that question makes it obvious that you should not even be
anywhere near the electronics industry.

 

[slampen]

Den 02.01.2011 22:15, skrev Greegor:

http://kuntigi.net/download/N344AB-1.jpg


Yeah, that's it! Thanks Jamie!

Tim Shoppa

Sounds right, thanks Mr. Shoppa!



http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=HUF75344G3-ND

HUF75344G3-ND in stock for $2.96 each! Thanks Mr. Wescott!

You can't get much better than that, slampen.

Yeah, thanks a lot to everyone!!

Geir

 

[Jon Kirwan]

<snip>
In stock for $2.96 each! Thanks Mr. Wescott!

You can't get much better than that, slampen.

I earlier posted a link to Future, where it is a dollar less
I think.

No accounting for shipping differences, though. And Digikey
used to have a $25 minimum to skip another extra charge.
Might still be policy.

Jon