transistor compatibility question

Clipped · 3rd March 2007, 12:47 PM

im fixing my friends old audison amp, and am having problems finding the original part for the transistors in the output section.

the originals are STmicro BDW93/94c and i cant find them, the only thing i can find is the STmicro BD911/912 pair.

the volt/amp ratings are ok, but the:
---------------------------------------------------
hfe @ Ic Vce min/max are totally different.

BD= min-15.....max-150.......(A)5...(V)4
BDW=min-750...max-20000...(A)5...(V)3
---------------------------------------------------
Vce(sat)@Ic Ib are also different

BD= (V)1 ....(A) 5....(ma)500
BDW=(V)2......(A)5....(ma)20
--------------------------------------------------
will the BD work? what exactly is hfe and Vce?

thanx

djQUAN · 3rd March 2007, 01:58 PM

Hfe is transistor gain and Vce is voltage across emitter and collector. (sat) means saturated or completely on.

Perry Babin · 3rd March 2007, 02:10 PM

The originals are darlingtons. The BD911 pair won't work.

If you can't find the originals, the TIP102/107 or the TIP142T/147T pairs should work. The 102/107 has a lower current rating but should work if he's not abusive.

Clipped · 3rd March 2007, 02:29 PM

darlingtons, it should be fun finding those here...

3rd March 2007, 12:47 PM	#1
Clipped diyAudio Member Join Date: Mar 2005 Location: home	transistor compatibility question im fixing my friends old audison amp, and am having problems finding the original part for the transistors in the output section. the originals are STmicro BDW93/94c and i cant find them, the only thing i can find is the STmicro BD911/912 pair. the volt/amp ratings are ok, but the: --------------------------------------------------- hfe @ Ic Vce min/max are totally different. BD= min-15.....max-150.......(A)5...(V)4 BDW=min-750...max-20000...(A)5...(V)3 --------------------------------------------------- Vce(sat)@Ic Ib are also different BD= (V)1 ....(A) 5....(ma)500 BDW=(V)2......(A)5....(ma)20 -------------------------------------------------- will the BD work? what exactly is hfe and Vce? thanx

3rd March 2007, 02:10 PM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The originals are darlingtons. The BD911 pair won't work. If you can't find the originals, the TIP102/107 or the TIP142T/147T pairs should work. The 102/107 has a lower current rating but should work if he's not abusive. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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3rd March 2007, 01:58 PM	#2
djQUAN diyAudio Member Join Date: May 2004 Location: manila	Hfe is transistor gain and Vce is voltage across emitter and collector. (sat) means saturated or completely on.

3rd March 2007, 02:29 PM	#4
Clipped diyAudio Member Join Date: Mar 2005 Location: home	darlingtons, it should be fun finding those here...

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