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Old 26th April 2009, 05:25 PM   #271
sajti is offline sajti  Hungary
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Quote:
Originally posted by MJL21193
Hi sajti,
The NJW's don't have a high enough SOA for my voltage. The MJW's are 3A at 70V. I chose these over the MJL's because they are (1) cheaper and (2) physically smaller - TO-247 as opposed to TO-264.
Yes, but You can use 6 pairs of 0302/0281, due the lower internal capacitances. The only advantage of the 21193/4 is the SOA. But the speed, and the B linearity is worse than X302/x281

Sajti
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Old 26th April 2009, 08:13 PM   #272
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The speed yes but why do you say the 0281/0302 is more linear than the MJW's?
When it comes down to it, the 2SA1943/C5200 are equal to the 0281/0302 and more accessible - available at Digikey.
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Old 26th April 2009, 08:19 PM   #273
sajti is offline sajti  Hungary
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If you check the Hfe vs Ic diagramm, you will find why the 0281/0302 more linear. Even the 3281/1302 more linear (up to 5A).
I get them from Farnell.

Sajti
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Old 26th April 2009, 09:06 PM   #274
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How about 5 pairs of these: 2STC5242 and 2STA1962

Half the price of the MJW's.
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Old 26th April 2009, 09:10 PM   #275
sajti is offline sajti  Hungary
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Looks nice. Low internal capacitance, and the hfe looks linear up to 3A

Sajti
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Old 26th April 2009, 09:35 PM   #276
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I'll order 20 of each and change my schematic for 5 pairs or possibly 6 pairs.
No spice model available for these. I'll use the 2SA1943/C5200 for an indication.
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Old 27th April 2009, 05:55 AM   #277
roender is offline roender  Romania
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Quote:
Originally posted by sajti
Looks nice. Low internal capacitance, and the hfe looks linear up to 3A

Sajti

Quote:
Originally posted by MJL21193
I'll order 20 of each and change my schematic for 5 pairs or possibly 6 pairs.
No spice model available for these. I'll use the 2SA1943/C5200 for an indication.
I'm sorry to say that, but IMHO you have no idea how to read and interpret a datasheet.
How did you come to the conclusion that ST transistors are more linear than 5200/1943 or 3281/1302?
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Old 27th April 2009, 10:00 AM   #278
sajti is offline sajti  Hungary
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Not more linear, but cheaper....

What I told, is that NJW1302/3281 is more linear.

Sajti
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Old 28th April 2009, 02:40 AM   #279
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Quote:
Originally posted by roender

How did you come to the conclusion that ST transistors are more linear than 5200/1943 or 3281/1302?
What's your opinion of the ST devices? I think they look pretty good for the price - these are actually a little more expensive than the Fairchild 2SA1943/C5200.
I have had good results with the 2SA1943/C5200 in my Patchwork amps, but I want a smaller package for this one with more devices.
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Old 28th April 2009, 10:32 AM   #280
sajti is offline sajti  Hungary
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You can get 2SC5242 from Fairchild as well. The direct order from the manufacturer means no problem with the fake transistors.

Sajti
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