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Old 4th March 2014, 11:01 AM   #1
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Default 2SA798

Hi,

There is another transistor(IC) , I am having problem finding replacement. I understand that this 2SA798 is an IC made up of 2 transistors. Can this component be modified.

Please assist

Thanks

Carlosraj
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Old 4th March 2014, 12:33 PM   #2
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Yes, you can use 2 matched small signal PNP transistor to replace it...
& glued together also it is a common emitter...
try 2SA1015 or BC560 or many other

Regards
John
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Old 5th March 2014, 08:17 PM   #3
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Here's a whole thread on the matter. Looks like a matched + thermally connected pair of ZTX795s is the way to go, though the trusty BC560 usually works as well. Oddly enough, these EBC pinout parts appear to be a better fit mechanically than your more typical ECB Japanese transistors (2SA970, 2/KSA992 etc.).
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Old 6th March 2014, 04:26 PM   #4
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Fairchild KSA992 will work beautifully. I've done it by installing two like this:

(|
|)

That's seen from the top. Solder the middle legs (emitters) together in the same hole. You get:

B
C
E
C
B

As on the original 2SA798 devices. Specs will be the same or better but compatible, too.

Thermally connected shouldn't be necessary. It's normal for these input pairs to be installed relatively far away from each other. I've certainly never seen something heat shrinked together (with thermal paste [on TO-92 devices!] no less) in a commercial design.
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Last edited by Welcome; 6th March 2014 at 04:30 PM.
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