2sa970 - 2SC2240 replacement in SOT23 ?

[NMOS]

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]

Hi ,


maybe replacement :2sc3324/2sa1312.

Z.B.

 

[CBS240]

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]

I would prefer that Pq <<50% of Pmax

 

[CBS240]

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]

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

 

[Ian Finch]

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

 

[satoru]

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.