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Old 25th October 2009, 11:58 AM   #1
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Default j352 - k2221 MOSFET PAIRS

i have about 40 pairs of these transistors .... come in as a replacement parts for ALTAIR pro amplifiers

any ideas of a schematic that can be used in ??

i am not looking for something especially powerfull ...2transistors per board and 50watts will be just perfect

thanks sakis
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Old 25th October 2009, 12:22 PM   #2
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Default found this one

i have found this one ...let me know what do you think ...and also since rail voltage is not stated ....i think that is got to be something be tween 40-60 volts or so

opinions please
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File Type: pdf amp lateral.pdf (30.1 KB, 227 views)
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Old 25th October 2009, 02:38 PM   #3
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Perhaps this types are the electrical (not mechanical) successors for the good known TO-3 types
2SK133-2SK134-2SK135
and 2SJ48-2SJ49-2SJ50
for compare and more information I have found this:
Renesas Technology America - Renesas VP
http://documentation.renesas.com/eng..._2sk2220ds.pdf
2SK134 pdf, 2SK134 description, 2SK134 datasheets, 2SK134 view ::: ALLDATASHEET :::
http://documentation.renesas.com/eng...0_2sj351ds.pdf
2SJ49 pdf, 2SJ49 description, 2SJ49 datasheets, 2SJ49 view ::: ALLDATASHEET :::
http://documentation.renesas.com/eng...5g0001_pmf.pdf
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Old 25th October 2009, 02:54 PM   #4
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Quote:
Originally Posted by sakis View Post
i have about 40 pairs of these transistors
J352/K2221 = 2SJ56/2SK176 in plastic dress code. (also Plastic J351/K2220 = 2SJ55/2SK175 TO3s )

Whenever i read J55/J56/K175/K176 i can't help but think Tandberg.
The 1S number of Lateral MOSFETs doesn't exactly advertise the use of single pair output stages.
Not in the mood for Speedy Otala inspired stuff ? => http://sportsbil.com/tandberg/tia-3012-sm.pdf
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Old 25th October 2009, 03:08 PM   #5
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a very fine schematic Jacco .... i will study it farther but for starts its too complicated ... still i like it very much

thanks ...i will look in to it
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Old 26th October 2009, 12:45 AM   #6
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jacco,
Quote:
J352/K2221 = 2SJ56/2SK176 in plastic dress code. (also Plastic J351/K2220 = 2SJ55/2SK175 TO3s )
Not at all, the J352/K2221 is in fact better and more closely matched.

sakis,
where did you get them?
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Old 26th October 2009, 08:18 AM   #7
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i got them as replacement sets ( matched ) and they where supposed to be replacement parts for Altair pro amps but these amps except a few electrolytics in the protection circuit and secondary psu normaly never fail ...

so now that i dont have to keep the transitors (the time limmit expired )i may as well use them for something else
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Old 27th October 2009, 10:51 AM   #8
Xoc1 is offline Xoc1  United Kingdom
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The 2SK2221 – 2SJ352 lateral mosfet pairs are 200V 8 amp devices.
They could be used in almost any circuit for the lower voltage lateral mosfet output pairs such as the 2SK1058 / 2SJ 162.
Typically they would have been used in multiple sets to take advantage of the higher voltage rating.
For instance
2 pairs could provide 150W / 8R, & 250W / 4R at +60V / 0 / -60V
4 pairs could provide 300w / 8R, & 500w /4R at +80V / 0 / -80V.
8 pairs could produce 500W / 8R, & 800W / 4R at +100V / 0 / -100V.
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Old 3rd May 2010, 12:47 AM   #9
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Default saludos desde paraguay

necesito de esos transistores como puedo comprar
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Old 3rd May 2010, 01:01 AM   #10
tinitus is offline tinitus  Europe
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francisco, please post in english
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