2SC3857/2SA1493

[Carlosraj]

Hi

I am unable to get these transistors belonging to an Onkyo A807 amp locally. The 2SC2921/2SA1215 pair are available. The 2SC3857/2SA1493 have a Vceo and Vcbo of 200V, Ib of 5A. The 2SC2921/2SA1215 pair have Vceo and Vcbo of 160V, Ib of 4A. The Ic of 15A is same for both. Can I use the later pair as a replacement. I took the actually reading on the amp between the collector and emitter and it reads around 55V DC, since the Vceo of this transistors are rated 160V DC, is it safe to use this pair as a replacement. Please advise.

Thanks

Carlos

 

[Project16]

You can buy them at Ampslab, they are original transistors...

http://ampslab.com/trans_2sc3857.htm

 

[JonSnell Electronic]

If you have 55 - 0 - 55v rails then 110v is expected without any peaks. With peaks add 50% making 165v possible peak spikes at full power.
They will work but might fail under high load conditions.

 

[Carlosraj]

If you have 55 - 0 - 55v rails then 110v is expected without any peaks. With peaks add 50% making 165v possible peak spikes at full power.
They will work but might fail under high load conditions.

Thanks JonSnell, I have no choice but give it a try. Getting them from AmpsLab for 40USD inclusive of shipping comes to about USD60, which amounts to about 300 Malaysian Ringgit is too expensive to get it repaired.

Carlos

 

[SVI2004A]

Also 2SA1494 and 2SC3858

 

[SVI2004A]

A1491-1494 and C3855-3858 are single chip power devices
1215 and 1216 / 2921 2922 are LAPT

That is the main difference in topology


Here is a quick look at the big SanKen offerings