New ON-semi BJT. anyone used it? - diyAudio
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Old 13th January 2004, 01:09 PM   #1
rchua77 is offline rchua77  Singapore
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Default New ON-semi BJT. anyone used it?

MJL4281A, MJL4302A released by ON semiconductors.

Has anyone any experienced with these new discrete products? rated 350V

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Old 13th January 2004, 05:28 PM   #2
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Hi!

So far I have used in my P3A:
MJ15003 / 15004 with BD139/140 as drivers
Sanken 2SC2922 / 2SA1216 with D1763A / B1186A as drivers,
and those new ON-Semi devices MJL4281A / MJL4302A with MJE15034 / MJE15035 as drivers

I have to admit that I did not experience a lot of differences between those three device combinations. The latest one, which I still use in the amp, handles my rail voltage (42 V) better, especially the drivers do not get as hot as the BD139/140 combination. And "hissing" (only hearable if you put your ear directly to the tweeter of my speakers) is best with those devices. I have yet to measure how much those samples ON sent me match, could be that they are better matched than my randomly used MJ15003/15004 combo.

Very sturdy devices, though I bet that they will be pricey if they ever get available through "normal" suppliers (so far I did not spot them in Germany).

Bye,

Arndt
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Old 13th January 2004, 05:40 PM   #3
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I have used the 4281 in a jlh1969, and compared it vs. tip41c. Not much of a difference.
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Old 13th January 2004, 06:32 PM   #4
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I haven't used it, but it looks like a nice part with a
lot of potential - fast, and with good linearity up to
an amp, making it a good candidate for small or
parallel operation.
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Old 13th January 2004, 09:30 PM   #5
osey is offline osey  England
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Ill be completing my first amp channel with them very soon. Ill let you know.
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Old 14th January 2004, 04:02 AM   #6
Jean is offline Jean  United States
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I just finished putting them in my p3a amp but haven't had a chance to compare them yet. I used mjl 193/194 pair prior to the new BJTs.
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Old 14th January 2004, 04:10 AM   #7
rchua77 is offline rchua77  Singapore
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Thanks for the great response everyone. I'm honoured that Mr Pass posted a reply even

Wonder how these new BJTs would compare with the legendary Toshiba 2SC3281 BJTs ? By any chance, has anyone used the ON semi's version of the 2SC3281 ... the MJL3281A, a review would be great ??

Regards
Roger
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Old 14th January 2004, 01:27 PM   #8
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I have compared 3281 vs. 4281 (actually both against tip41c) in a jlh1969. Not much difference between 3281 vs. 4281 for that application.
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Old 14th January 2004, 01:56 PM   #9
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Quote:
Originally posted by rchua77
Thanks for the great response everyone. I'm honoured that Mr Pass posted a reply even

Wonder how these new BJTs would compare with the legendary Toshiba 2SC3281 BJTs ? By any chance, has anyone used the ON semi's version of the 2SC3281 ... the MJL3281A, a review would be great ??

Regards
Roger
The ON version is claimed to be even better than the Toshiba, it has been discussed on this forum also, maybe the search function will help...

Also on the ESP site you can find some useful info.

Cheers

Andrea
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Old 14th January 2004, 02:00 PM   #10
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Default ossssssscillations

"especially the drivers do not get as hot as the BD139/140 combination. And "hissing" (only hearable if you put your ear directly to the tweeter of my speakers) is best with those devices."

This could be a sign of parasitic HF or RF oscillations. BTDT. In four different manufacture's data sheets, I can't even find Ft for the BD139/140. They are really not suited for drivers for amps with high speed output transistors.
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