2SA1024/2SC3206 substitution sugestion

RiLoWa · 25th September 2011, 04:37 PM

I am trying to repair an Audiosource AMPSUB210 and I can not find either of those transistors in stock anywhere.

Would the Toshiba 2SA1145 and 2SC2705 reliably subsitute in?

Or is there something else?

ingenieus · 26th September 2011, 11:07 AM

As far as I can tell from the datasheets for the 2SA1024 and 2SA1145, they are a close match. The absolute maximum ratings are almost identical and hfe is close enough. Most importantly, the legs match as well, i.e. 1=E, 2=C, 3=B.

The 2SA1145 has less output capacitance and a higher fT. That should not be a problem, but to be sure you will have to:
(a) run a SPICE simulation [optional]
(b) solder in place and test

RiLoWa · 26th September 2011, 03:02 PM

Thanks for looking into it. One other difference was a slight drop in power disipation, the 1024 was 1W and the 1145 drops to 800mW, also probably not an issue.
While I have the SPICE program, I am not experienced using it to model circuits.

Unless someone knows a good U.S. source for the 1024 & 3206 and is willing to share it or a better sub, I will try the 1145 & 2705 in their place.

25th September 2011, 04:37 PM	#1
RiLoWa diyAudio Member Join Date: Aug 2010 Location: Illinois	2SA1024/2SC3206 substitution sugestion I am trying to repair an Audiosource AMPSUB210 and I can not find either of those transistors in stock anywhere. Would the Toshiba 2SA1145 and 2SC2705 reliably subsitute in? Or is there something else? __________________ Tools - 1. TPI Scope Plus 440 2. B&K 2125 20MHz Dual Trace 3. Sorensen DCR20-50B 4. B&K 4011 5MHz Function Generator 5. Weller WESD51

26th September 2011, 03:02 PM	#3
RiLoWa diyAudio Member Join Date: Aug 2010 Location: Illinois	Thanks for looking into it. One other difference was a slight drop in power disipation, the 1024 was 1W and the 1145 drops to 800mW, also probably not an issue. While I have the SPICE program, I am not experienced using it to model circuits. Unless someone knows a good U.S. source for the 1024 & 3206 and is willing to share it or a better sub, I will try the 1145 & 2705 in their place. __________________ Tools - 1. TPI Scope Plus 440 2. B&K 2125 20MHz Dual Trace 3. Sorensen DCR20-50B 4. B&K 4011 5MHz Function Generator 5. Weller WESD51

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26th September 2011, 11:07 AM	#2
ingenieus diyAudio Member Join Date: Apr 2011	As far as I can tell from the datasheets for the 2SA1024 and 2SA1145, they are a close match. The absolute maximum ratings are almost identical and hfe is close enough. Most importantly, the legs match as well, i.e. 1=E, 2=C, 3=B. The 2SA1145 has less output capacitance and a higher fT. That should not be a problem, but to be sure you will have to: (a) run a SPICE simulation [optional] (b) solder in place and test

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