Car amp. transistors.

  • Thread starter Matt Flax the original fl
  • Start date
M

Matt Flax the original fl

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HI I am in the process of fixing a car amp.
These transistors are clean blown off ! I don't know how it happened
'cause it arrive to me in this shape.

Anyways I have these transistor packages to replace :
http://www.pgb.unsw.edu.au/~flatmax/burntTransistors.jpg

The packages say (on the casing) :
SEC
629
IRFZ34

Could anyone tell me how to find an equivalent (or the same) package ?

thanks
Matt
 
Matt Flax the original flatmax(flatmax@noSPASMS.ieee.org) showed us the
following results:


Could anyone tell me how to find an equivalent (or the same) package ?
Click to expand...
It is an IRFZ34 from International Rectifier.

http://www.google.com/search?q=IRFZ34 gives a good amount of results.

NTE2389 replaces it. http://www.nteinc.com/specs/2300to2399/NTE2389.html

[]s
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"Matt Flax the original flatmax"


The packages say (on the casing) :
SEC
629
IRFZ34

Could anyone tell me how to find an equivalent (or the same) package ?
Click to expand...
** Farnell sell the IRFZ34E ( 60 volt rated) for about $2 a piece.

Cat 168-180.




.............. Phil
 
Here's the datasheet:
http://www.irf.com/product-info/datasheets/data/irfz34.pdf
Parts should be available from any International Rectifier distributor.
--Chuck

"Matt Flax the original flatmax" <flatmax@noSPASMS.ieee.org> wrote in
message news:WHUtc.15880$L.361@news-server.bigpond.net.au...
HI I am in the process of fixing a car amp.
These transistors are clean blown off ! I don't know how it happened
'cause it arrive to me in this shape.

Anyways I have these transistor packages to replace :
http://www.pgb.unsw.edu.au/~flatmax/burntTransistors.jpg

The packages say (on the casing) :
SEC
629
IRFZ34

Could anyone tell me how to find an equivalent (or the same) package ?

thanks
Matt
Click to expand...
 
You can use the ECG289 or NTE289 from Philips. Many of the parts dealers can
have these. If these are blown, you better check all the drivers down the
line from them. There are most likely other support components that are
damaged as well.

These usually blow from the radio being over driven, or the speaker wires
were shorted. This repair will be very expensive just for the parts alone!

The transistor you want is standard, and is available most anywhere.

--

Jerry G.
=====


"Matt Flax the original flatmax" <flatmax@noSPASMS.ieee.org> wrote in
message news:WHUtc.15880$L.361@news-server.bigpond.net.au...
HI I am in the process of fixing a car amp.
These transistors are clean blown off ! I don't know how it happened
'cause it arrive to me in this shape.

Anyways I have these transistor packages to replace :
http://www.pgb.unsw.edu.au/~flatmax/burntTransistors.jpg

The packages say (on the casing) :
SEC
629
IRFZ34

Could anyone tell me how to find an equivalent (or the same) package ?

thanks
Matt
 
i must say that it looks like they took a good hit!
more like some one plugged it direclty into the wall or connected
backwards.
i think you those are HexFet transistors use to supply a
high amout of current with low engery drive..
normally what i do in a case like you have there
is replace all of them with the same lot component..
meaning, just buy all of the same part number.
because i have found that even though another
near by in the same circuit may appear to test
ok it maybe possible they are not./.
heavy current surging on non formed contacts generate
a flyback effect which in turn is high voltage and can
damage other units since we are talking about power fets.



Matt Flax the original flatmax wrote:

HI I am in the process of fixing a car amp.
These transistors are clean blown off ! I don't know how it happened
'cause it arrive to me in this shape.

Anyways I have these transistor packages to replace :
http://www.pgb.unsw.edu.au/~flatmax/burntTransistors.jpg

The packages say (on the casing) :
SEC
629
IRFZ34

Could anyone tell me how to find an equivalent (or the same) package ?

thanks
Matt
Click to expand...
 
IRFZ34 available from Digi-key http://www.digikey.com , East Coast
Transistor www.kenwoodparts.com . Can be replaced with IRFZ44 for an
upgrade. Usual causes for failure like this in a car audio amp DC-DC
converter is shorted finals, too low impedance load, low voltage, or some
dummy hooked it up backwards. Make sure to check the gate bias resistors,
and if this one uses a TL494C PWM controller, check the transistors that
drive the FET's. A quick-n-dirty way to check most of these car amp power
supplies is to remove the bad FET's and power up the amp, and use a
oscilloscope to check for a clean square wave with little or no DC at the
connection the FET gate goes to. This eliminates putting in new FET's only
to cook them in the event the PWM/drivers were damaged. Also check the
reverse-bias diode connected across the battery terminals. If the unit was
connected backwards, it may be shorted.


--
Jammy Harbin
J & J Electronics, Inc.
227 S. 4th St.
Selmer, TN 38375
731-645-3311
"Matt Flax the original flatmax" <flatmax@noSPASMS.ieee.org> wrote in
message news:WHUtc.15880$L.361@news-server.bigpond.net.au...
HI I am in the process of fixing a car amp.
These transistors are clean blown off ! I don't know how it happened
'cause it arrive to me in this shape.

Anyways I have these transistor packages to replace :
http://www.pgb.unsw.edu.au/~flatmax/burntTransistors.jpg

The packages say (on the casing) :
SEC
629
IRFZ34

Could anyone tell me how to find an equivalent (or the same) package ?

thanks
Matt
Click to expand...
 
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