I must have picked the Digikey thing up somewhere and never really followed it up till now. Thank you all for your input I have no further doubts. I have been using Mouser in the past. Now I feel little silly bringing up something I have no real source to back with. I actually searched the net where I saw this and could not really find the thread that would suggest it. There was one mention here: Fake or Real 2SA1943 but it inst as bad as my initial query would suggest. ( using the words "famous of" was not accurate ).
Thanks all for clearing this up.
Thanks all for clearing this up.
Thank you for posting that. I would call that message pure b.s. as there is no evidence provided that it ever happened. So it was just speculation, completely shattered in the message below, that "...if supplier carries obsolete parts...". Clearly person had no clue what he is talking about
see:
TTA1943(Q)
TTC5200(Q)
someone must have a few thousand....
~200 in stock at digi.key
TTA1943(Q)
TTC5200(Q)
someone must have a few thousand....
~200 in stock at digi.key
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too bad they're not enhancement mode power jfets like the 2sk2013/2sj313. they'd all be gone already 
see:
TTA1943(Q)
TTC5200(Q)
someone must have a few thousand....
~200 in stock at digi.key
C5200 can be used to replace C3281 in class AB amplifier service, IF the power supply voltage is less than +/-55 volts. This covers many use cases, but NOT this one. Higher voltage operation or class A service need the OnSemi C3281 clones or Sanken LAPT’s.
I read this discussion with interest as I was asked to repair a pair of Restek Extent mono blocks a few years ago.
They use 10 pairs of 2SA1302 & 2SC3281 per unit and most were blown when I took them apart. I looked at the data sheets for the 2SA1943 & 2SC5200 and found they are rated at Vce 230V, Ic 15A, and Pd 150W.This is a higher voltage rating than the originals devices 200V, not lower as stated here, so I rebuilt it using the 2SA1943 & 2SC5200 combo.
The owner is very happy with the results and they are still going strong 3 years later, so I can recommend these devices as replacements.
If you can find them, TTA0002 & TTC0002 are another good replacement from Toshiba. They are lower voltage at Vce 160V but have Ic of 18A and Pd of 180W. Onkyo used these in some of their flagship AVRs giving a very powerful multi channel system.
They use 10 pairs of 2SA1302 & 2SC3281 per unit and most were blown when I took them apart. I looked at the data sheets for the 2SA1943 & 2SC5200 and found they are rated at Vce 230V, Ic 15A, and Pd 150W.This is a higher voltage rating than the originals devices 200V, not lower as stated here, so I rebuilt it using the 2SA1943 & 2SC5200 combo.
The owner is very happy with the results and they are still going strong 3 years later, so I can recommend these devices as replacements.
If you can find them, TTA0002 & TTC0002 are another good replacement from Toshiba. They are lower voltage at Vce 160V but have Ic of 18A and Pd of 180W. Onkyo used these in some of their flagship AVRs giving a very powerful multi channel system.
Vceo rating may be higher, but the current handling at 55V is lower on the new parts. They may however, be sandbagging the spec. An amp that uses the proper 10 pairs of them instead of trying to get away with four will do better - thats how they “solved” the second breakdown problem back when NO available output transistor could handle full power above 30-50 volts.
Some of the best, most rugged, Sanken LAPTs of yesteryear were only rated 160 or 180 volts, and they held up better than the 230V parts that “replaced” them.
Some of the best, most rugged, Sanken LAPTs of yesteryear were only rated 160 or 180 volts, and they held up better than the 230V parts that “replaced” them.
I wasn't aware of the On Semi parts when I carried out the repair and in hindsight would have used these in preference. If the owner manages to destroy them again I will rebuild with those instead as they look to be a closer match to the originals and are still available.
He also has a pair of Restek Extracts, which are the smaller versions with 4 pairs of BJTs per unit. These were also rebuilt using the same Toshiba devices and so far no problems reported.
He also has a pair of Restek Extracts, which are the smaller versions with 4 pairs of BJTs per unit. These were also rebuilt using the same Toshiba devices and so far no problems reported.