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Old 27th October 2006, 01:14 PM   #1
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Default Looking for Transistors

Hi all, recently my surround sound receiver went kaput on me. I checked it out and 2 of the power transistors have fried. I'm just looking to replace those transistors but am not sure where to look for them. Any suggestions on the best place to find them? It's a Sony V333ES model. It's the left front pair that blew. Thanks alot!
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Old 27th October 2006, 01:18 PM   #2
Netlist is offline Netlist  Belgium
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What is written on them?

/Hugo
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Old 27th October 2006, 01:33 PM   #3
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ok on the left one

S K
SAP15
NO (or 0 not sure)
0D11

right one

S K
SAP15
PO (or 0 again, not sure)
0022
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Old 27th October 2006, 01:37 PM   #4
clem_o is offline clem_o  Philippines
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you'll have to replace them with the exact parts - the SAP15s are 5-legged devices that combine the transistor and biasing diodes in one case.

They are manufactured by Sanken.

N is the Nchannel, P is.. obvious... :-)

cheers


link: Sanken SAP15 transistors


You can get them from Farnell, according to that link...
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Old 27th October 2006, 01:58 PM   #5
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Great!! Thanks clem-o. Just out of curiosity, what's the advantage of these transistors loaded with the built in biasing diode?
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Old 27th October 2006, 02:22 PM   #6
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Oh, also. When finding these chips, do i just need to match the SAP15 number or do all have to match?
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Old 27th October 2006, 10:56 PM   #7
clem_o is offline clem_o  Philippines
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Hi,

Just specify that you need a pair, i.e. SAP15-N and SAP15-P versions and you shoudl be ok.

The built-in diodes serve to give the amplifier circuitry information regarding the temperature of the transistor. As a semiconductor changes temp, some of its characteristics change, and to keep the amplifier in "optimal" operation, circuitry must compensate.

Normally this thermal sensing is done using an external transistor or external diodes mounted as close as possible to the output transistors, but of course this gives a delayed 'sense' due to thermal lag. With the SAPxx, the thermal lag is minimized and possibly the accuracy of the temp measurement enhanced.

Cheers!
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Old 28th October 2006, 01:16 AM   #8
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you can also get them from Profusion in the U.K. -- Allegro Micro carries Sanken in the U.S. but I haven't been able to deal with them.
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