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Old 6th September 2003, 04:53 AM   #1
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Thumbs up the best just got better...

These in my view, are currently the best all-round power BJT's on the planet:

http://www.onsemi.com/pub/Collateral/MJL4281A-D.PDF

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Old 6th September 2003, 11:58 AM   #2
djk is offline djk
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Might be OK as a driver transistor.

No real output capability, only 100W safe area at 100V.

Speed drops like a rock above 4A or so.
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Old 6th September 2003, 12:03 PM   #3
audioPT is offline audioPT  Portugal
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... and they don't have samples in their site (yet!)...
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Old 6th September 2003, 01:02 PM   #4
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Default Re: the best just got better...

Quote:
Originally posted by mikek
These in my view, are currently the best all-round power BJT's on the planet:
agreed

Quote:
Originally posted by djk
Might be OK as a driver transistor.
No real output capability, only 100W safe area at 100V.
Speed drops like a rock above 4A or so.
hey those are power transistors not drivers !!!
if the safe operating area is 100V -1A or like u calculated 100W
it doesnt mean that if u use those as output transistors then your amp will be 100W !
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Old 6th September 2003, 11:29 PM   #5
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Default Re: Re: the best just got better...

Quote:
Originally posted by djk
Might be OK as a driver transistor.

No real output capability, only 100W safe area at 100V.

Speed drops like a rock above 4A or so.

No...

Quote:
Originally posted by sss


hey those are power transistors not drivers !!!
if the safe operating area is 100V -1A or like u calculated 100W
it doesnt mean that if u use those as output transistors then your amp will be 100W !

correct..
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Old 7th September 2003, 12:22 AM   #6
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Default s.o.a

will design full and completely benign general purpose S.O.A protection for these shortly, (double and treble slope)....watch this space....
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Old 7th September 2003, 02:27 AM   #7
Duo is offline Duo  Canada
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In my opinion, those are nice transistors.

I have used transistors with lower ft in some amps for high current and they do just fine. For example, the mj21193/21194 pair have a very respectable sound.

I'm with Mikek and sss on this one.
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Old 7th September 2003, 08:49 PM   #8
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"I have used transistors with lower ft in some amps for high current and they do just fine. For example, the mj21193/21194 pair have a very respectable sound."

I would consider this new transistor a good driver for MJ21193/94 outputs. Above 4A the MJ21193/94 are faster, and have twice the safe area at 100V.

Introduction is pending, no samples or cost basis available.
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Old 8th September 2003, 01:18 AM   #9
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Default comparison

actually the new devices are demostrably superior to MJL21193/21194 in terms of gain-linearity...Ft..etc.

the newer devices can of course be used as drivers, but it would be more elegant to use Toshiba's 2SC4793/1837 pair, which are optimised for the purpose, and have Ft~100MHz.
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Old 8th September 2003, 01:28 AM   #10
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Default comparison contd

...and i really cannot see how the MJL21194/93 pair can be said to be appreciably faster beyond 4A.
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