Sanken LEXAM SAPM01 audio transistors - diyAudio
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Old 16th October 2003, 12:07 PM   #1
Electrons are yellow and more is better!
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Default Sanken LEXAM SAPM01 audio transistors

Hi!

Anyone who knows more about SAPM01, temperature compensated MOSFET's for audio?

150 V, 20 A, 150 W
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Old 16th October 2003, 12:30 PM   #2
OliverD is offline OliverD  Germany
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Too early for datasheets. There are only press releases to be found on the net. Distributor in Europe is Allegro Microsystems
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Old 16th October 2003, 12:34 PM   #3
Electrons are yellow and more is better!
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Why can't they release datasheets like everybody else? Some firms release them very early in order to get attention. Cirrus for example.
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Old 16th October 2003, 06:28 PM   #4
OliverD is offline OliverD  Germany
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I guess you can contact the distributor in your area and ask them for a preliminary datasheet.

But then, why are you so eager to get them? My guess is thay are much more expensive than any other "audio" MOSFET and still won't sound better.
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Old 16th October 2003, 07:32 PM   #5
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They cost 3.11 Euro in single quantity. Hardly very expensive.
Funny that they seem available but the datasheets not.

http://www.profusionplc.com/scripts/...ken&itypes=all
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Old 16th October 2003, 07:47 PM   #6
OliverD is offline OliverD  Germany
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IRFP240 (20A, 200V, 150W) is 1.35 € in single quantities.
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Old 16th October 2003, 07:57 PM   #7
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Quote:
Originally posted by AMT-freak
IRFP240 (20A, 200V, 150W) is 1.35 € in single quantities.

Sure, but they are not equivalent products, and the price is still
reasonable I think.
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Old 16th October 2003, 08:04 PM   #8
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It's very easy to temperature compensate a complementary set of Power MOSFET's like IRFP240 / IRFP9240.

You can either use:

1..A small MOSFET like IRFP614I with 2 resistors and a trimmer on the gates, much like a normal BIAS transistor in a bipolar output stage, or :

2..exploit the fact that the derating factor of an IRFP is roughly the same as a normal Vbe (2,2 mV / K). Use a constant voltage source, and a Vbe doubler with a bipolar transistor (2N2222 or BC548) and you'll be all set!

These devices are great fun to build with, but their Rs varies a great deal with load, so you must find a way to compensate for that in your amplifier circuit. (if you want good sound - preferably without feedback loops).
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