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destroyer X 12th February 2009 11:06 AM

Is it an advantage to use this one instead of 2SC5200 or 2SA1943?
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What do you think about those Fairchild units,this one for instance, is this one better or worse?


I have units enougth to produce a 6 Kilowatt amplifier.



jacco vermeulen 12th February 2009 11:22 AM

Worse, if you look at the FJL4215 datasheet.
Better, if you already have so many.

For an equivalent extended beta and peak SOA, just put more in parallel.

sajti 12th February 2009 11:34 AM

This FJLs are quite good devices. I use many of them. What is the best, that they are available in selected B group.


destroyer X 12th February 2009 01:09 PM

Thank you guys.

FJL is the prefix number to search the datasheet... i will take a look on that.



sajti 12th February 2009 01:44 PM

I use 8 pairs of the FJL4215/4315 in bridged amplifier. It gives 250W/8ohms, and close to 900W in 2 ohms


Bigun 11th December 2009 02:46 AM

Carlos, did you listen to these Fairchild devices ? - I have a few at my side and wondering whether to use any.

destroyer X 11th December 2009 04:20 AM

Looks the same 2SC5200/2SA1943 transistors, i could not perceive
important differences between them, as i have both and use to assemble amplifier using both of them into the output.

I have a lot, all them gift from our forum friend a days they are my main transistors because the number of units i have.... well, they are finishing because i have 6 amplifier assembled and some of them using many output pairs.... i think i may have 4 pairs of these Fairchild and about 5 pairs of 2SC5200/2SA1943

The advantage i had, is that mine units have the NPN and the PNP with almost the same gain, not 10 or 20 percent, but the absolutelly same gain... when the 2SC5200/1943 i have show 30 percent differences in gain, as usual, with bigger gain to PNP devices.

The fairchild 2SC5200 and 2SA1943 looks better in heat transference than the Toshiba ones.

This is the second time i can see that happening, first time was down the seventies when they used to sell some AD161/162 pairs matched inside a plastic bag and sometimes PVC case..but those Germanium were matched under 20 percent.

The upper case seems to be more hot than the 2SC5200, but transistor power, the transistor to case/heatsink heat transference looks to be the same.

For sure they may have small differences, but this represents something alike a big pot of soup and then you let three grains of sugar fell down into your salted food... no one can perceive sweet taste into such situation.



Bigun 11th December 2009 05:46 PM

This is encouraging - it means I can use them. My 5200/1943 devices are TO-220 whereas the Fairchild devices are TO-3 and since I'm going to be biassing to Class A it seems that the bigger package will be a better choice.

destroyer X 11th December 2009 05:57 PM

I have used them as drivers too, and the result (sonic) was fine!
The units are fine fellows, they work without complain and seems reliable and good under my eyes.



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