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
http://www.onsemi.com/pub/Collateral/MJL4281A-D.PDF
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 real output capability, only 100W safe area at 100V.
Speed drops like a rock above 4A or so.
mikek said:These in my view, are currently the best all-round power BJT's on the planet:
agreed
djk said:
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 !
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....🙂
will design full and completely benign general purpose S.O.A protection for these shortly, (double and treble slope)....watch this space....🙂
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.
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.
"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.
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.
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.
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.
Attachments
And you can actual buy them......
Sanken 2SC2922 and 2SA1216 look better to me.
http://www.ampslab.com/components.htm
www.ampslab.com/PDF/2sc2922.pdf
www.ampslab.com/PDF/2sa1216.pdf
Sanken 2SC2922 and 2SA1216 look better to me.
http://www.ampslab.com/components.htm
www.ampslab.com/PDF/2sc2922.pdf
www.ampslab.com/PDF/2sa1216.pdf
"...and i really cannot see how the MJL21194/93 pair can be said to be appreciably faster beyond 4A"
"...further, any differences in SOA are vanishingly negligible......."
Hey, I'm sorry you can't read the data sheets right.
Fig. 9 on the MJL4281 shows the unity gain bandwidth product to clearly be in the 2Mhz~3Mhz region at 5A. If I'm going to use this as a driver at 2A or less it is 40Mhz~50Mhz.
Fig.2 on the MJ21194 shows the gain bandwidth product at 5A to be almost 5Mhz.
Last time I checked, 5Mhz was faster than 3Mhz.
Fig.11 on the MJL4281 shows the safe area as being 100W at 100V
Fig. 13 on the MJ21194 shows the safe area as being 200W at 100V
The last time I checked, 200W was not a 'vanishing negligble' difference compared to 100W.
Pro amps with ±100V rails are not uncommon today. Peak currents at 2R are on the order of 40A. Without a tiered supply a popular amp uses 8 pair of MJ21193/94, about 5A per pair, another model from the same company with the same main rail voltages with a two tier supply only has 3 pair of 3281/1302, about 13A per pair.
"...further, any differences in SOA are vanishingly negligible......."
Hey, I'm sorry you can't read the data sheets right.
Fig. 9 on the MJL4281 shows the unity gain bandwidth product to clearly be in the 2Mhz~3Mhz region at 5A. If I'm going to use this as a driver at 2A or less it is 40Mhz~50Mhz.
Fig.2 on the MJ21194 shows the gain bandwidth product at 5A to be almost 5Mhz.
Last time I checked, 5Mhz was faster than 3Mhz.
Fig.11 on the MJL4281 shows the safe area as being 100W at 100V
Fig. 13 on the MJ21194 shows the safe area as being 200W at 100V
The last time I checked, 200W was not a 'vanishing negligble' difference compared to 100W.
Pro amps with ±100V rails are not uncommon today. Peak currents at 2R are on the order of 40A. Without a tiered supply a popular amp uses 8 pair of MJ21193/94, about 5A per pair, another model from the same company with the same main rail voltages with a two tier supply only has 3 pair of 3281/1302, about 13A per pair.
come on guys , there's nothing to argue about 
the new transistors are better!!! , u should look at all parameters ,those are not driver transistors , well maybe for a 10000W amp 🙂
the new transistors are better!!! , u should look at all parameters ,those are not driver transistors , well maybe for a 10000W amp 🙂
I'll take Fred's suggested Sankens over anything motorola makes and feel no guilt or shame over it either! 😉
Re: And you can actual buy them......
Current gain is vastly inferior to the onsemi's.......therefore sankens significantly less linear than either the new onsemi devices, or even their earlier MJL3281A/1302A BJT's
Fred Dieckmann said:
Current gain is vastly inferior to the onsemi's.......therefore sankens significantly less linear than either the new onsemi devices, or even their earlier MJL3281A/1302A BJT's
Why don't we all just quite this redundant argument and pick our transistors based on past experience, opinion, taste, and by testing in real life to see what transistors sound best??
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