2sa970 - 2SC2240 replacement in SOT23 ?

NMOS · 21st November 2011, 03:10 AM

Hello

have seen 2sa970 - 2SC2240 will going obsolete, but there is a TOSHIBA SOT23 Model with same technical specs. Does somebody know device number ?

ZeneBona · 21st November 2011, 09:05 AM

Hi ,

maybe replacement :2sc3324/2sa1312.

Z.B.

CBS240 · 21st November 2011, 10:37 AM

SOT 23 has smaller Pd. If your replacing a part in an existing circuit be sure to check bias and power of the TO-92. I would not go above 60% Pd max for reliability purposes, IMO.

AndrewT · 21st November 2011, 10:59 AM

I would prefer that Pq <<50% of Pmax

CBS240 · 03:26 PM

Yes, perhaps <50%. When I design with SMD and expect to reach the that limit, I like to draw a larger copper area for the collector pin so you don't have to de-rate quite as much. This extra heat sinking of the collector pin bumps up reliable Pd a bit by lowering die temperature and so less de-rating. The datasheet for SMDs usually specifies a certain copper area with specific copper thickness and standard FR-4 PCB material. If it is not mounted as designed for SMD PCB pads, I wouldn't go more than 30% especially for the higher voltage ones. A small current spike can destroy it quickly.

Ian Finch · 21st November 2011, 11:09 PM

Not many SMD types generally, are rated to 120V Vce. Do you need a high voltage type? .

Ian Finch · 22nd November 2011, 12:27 AM

However, these look good
http://www.fairchildsemi.com/ds/FJ/FJV992.pdf
http://www.fairchildsemi.com/ds/FJ/FJV1845.pdf

satoru · 23rd November 2011, 12:02 AM

2SA1163/2SC2713. As far as I can tell, the plots on the spec sheet are the exactly the same as 2SA970/2SC2240. Of course, the power dissipation is smaller, though.

Have fun!

PS. I have some of these in hand. Drop me a PM if you want to try them out.

21st November 2011, 03:10 AM	#1
NMOS diyAudio Member Join Date: Dec 2010 Location: Frankfurt	2sa970 - 2SC2240 replacement in SOT23 ? Hello have seen 2sa970 - 2SC2240 will going obsolete, but there is a TOSHIBA SOT23 Model with same technical specs. Does somebody know device number ?

21st November 2011, 10:37 AM	#3
CBS240 diyAudio Member Join Date: Aug 2005 Location: K-town	SOT 23 has smaller Pd. If your replacing a part in an existing circuit be sure to check bias and power of the TO-92. I would not go above 60% Pd max for reliability purposes, IMO. __________________ All the trouble I've ever been in started out as fun......

21st November 2011, 10:59 AM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	I would prefer that Pq <<50% of Pmax __________________ regards Andrew T.

21st November 2011, 03:21 PM	#5
CBS240 diyAudio Member Join Date: Aug 2005 Location: K-town	Yes, perhaps <50%. When I design with SMD and expect to reach the that limit, I like to draw a larger copper area for the collector pin so you don't have to de-rate quite as much. This extra heat sinking of the collector pin bumps up reliable Pd a bit by lowering die temperature and so less de-rating. The datasheet for SMDs usually specifies a certain copper area with specific copper thickness and standard FR-4 PCB material. If it is not mounted as designed for SMD PCB pads, I wouldn't go more than 30% especially for the higher voltage ones. A small current spike can destroy it quickly. __________________ All the trouble I've ever been in started out as fun...... Last edited by CBS240; 21st November 2011 at 03:26 PM.

21st November 2011, 11:09 PM	#6
Ian Finch diyAudio Member Join Date: Apr 2010 Location: Coffs Harbour, on the east coast	Not many SMD types generally, are rated to 120V Vce. Do you need a high voltage type? . __________________ regards


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21st November 2011, 09:05 AM	#2
ZeneBona diyAudio Member Join Date: Apr 2007	Hi , maybe replacement :2sc3324/2sa1312. Z.B.

22nd November 2011, 12:27 AM	#7
Ian Finch diyAudio Member Join Date: Apr 2010 Location: Coffs Harbour, on the east coast	However, these look good http://www.fairchildsemi.com/ds/FJ/FJV992.pdf http://www.fairchildsemi.com/ds/FJ/FJV1845.pdf __________________ regards

23rd November 2011, 12:02 AM	#8
satoru diyAudio Member Join Date: Jan 2007 Location: Berkeley, California	2SA1163/2SC2713. As far as I can tell, the plots on the spec sheet are the exactly the same as 2SA970/2SC2240. Of course, the power dissipation is smaller, though. Have fun! PS. I have some of these in hand. Drop me a PM if you want to try them out.

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