Toshiba 2SC3281/2SA1302 - Are these fakes? - Page 6 - diyAudio
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Old 8th August 2009, 03:58 PM   #51
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Hello everyone! I need a couple of 2sa1301/2sc3280 transistors. I have found a pair on e-bay. Can you please tell me if they are originals?
Here is the link:
http://cgi.ebay.com/ws/eBayISAPI.dll...m=320404666221

Thanks in advance,
Andy.
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Old 8th August 2009, 04:44 PM   #52
taj is offline taj
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If they came from Europe or N. America, I'd be a bit suspicious. But since they are coming from Hong Kong, you can be assured they are fake. HK is the Asian central distribution point for all things fake.

I'd like to take everyone on a Chinese 'fakes tour' over there. Including the markets and factories. It's a breathtaking and sad experience.

Buy some 2SC5200/A1943 devices (or the Fairchild eqv., can't remember their #) from Digikey. Guaranteed real.

..Todd
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Old 8th August 2009, 05:27 PM   #53
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Quote:
Originally posted by EWorkshop1708
I notice the older Toshiba are rated 150W
The newer On-Semi are 230W

Is the Toshiba underrated, or the OnSemi overrated
If you compare the applicable part of the Safe Area curve (for higher power applications at least), and adjust for a realistic Tc, you'll find the usable power dissipation isn't that different. The max dissipation rating is completely useless in the real world unless you immerse your output stage in liquid nitrogen and run low voltage rails

In general, I second giving up on trying to find genuine but long obsolete higher Ft devices and use the 5200/1943 or the On Semi devices. For any sane audio use their Ft is plenty high. A faster part is often *not* better better for audio. And if you're using it for RF purposes, use an RF transistor. This is diyAudio not diyRF...
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Old 8th August 2009, 05:40 PM   #54
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Quote:
Originally posted by andy_barosanu
Hello everyone! I need a couple of 2sa1301/2sc3280 transistors. I have found a pair on e-bay. Can you please tell me if they are originals?
Here is the link:
http://cgi.ebay.com/ws/eBayISAPI.dll...m=320404666221

Thanks in advance,
Andy.
Yep! These ones on eBay seems as real FAKE as they can be. The cheaper lighter green color on PNP package and only partially visible words are a giveaway they are FAKEs. And then, "Japan" underneath is just to assure you they are not made there.

Coming from HK? I wouldn't used them in the circuit even if it's FREE.

Obsolete parts? Just use newer devices with lower fT when possible. I learned my lessons with 2SA1095. 6 out of 6 2SA1095 has C-E shorted during 2 hours and my third time to pull things apart to fix the darn output stages.
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Old 9th August 2009, 12:10 AM   #55
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If I ever have to replace the genuine Toshiba pairs I am using in one of my amplifiers.... I cirtianly would not purchase replacements from ebay, too much fake junk is sold there in general as it is.


So just go with the good advice and purchase newer high power transistors, and for strange packages like the 2SD845/2SB755, there are NTE92/93, and they are higher rated and I have never heard of NTE devices being faked!

Of course, that is if you can afford them....
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Old 9th August 2009, 12:11 PM   #56
wg_ski is offline wg_ski  United States
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Quote:
Originally posted by CrazzyAbtTubes
there are NTE92/93, and they are higher rated and I have never heard of NTE devices being faked!

Of course, that is if you can afford them....
Yeah - why would anyone fake a fake? NTEs are fake to begin with. Well, maybe the NTE123 and 130 are real.... but anything high performance or out of print? Forgetaboutit.
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Old 9th August 2009, 02:23 PM   #57
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by EWorkshop1708
I notice the older Toshiba are rated 150W
The newer On-Semi are 230W

Is the Toshiba underrated, or the OnSemi overrated
Quote:
Originally posted by RocketScientist
If you compare the applicable part of the Safe Area curve (for higher power applications at least), and adjust for a realistic Tc, you'll find the usable power dissipation isn't that different.
you will find the opposite.
The higher voltage SOA of the 1943/5200 is far inferior to the 4281/4301 at any operating Tc.
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regards Andrew T.
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Old 20th September 2009, 08:09 PM   #58
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Back at the end of August, I bought some 2SA1302 & 2SC3281 transistors from ebay seller lpcsunny2008. I didn't know about this counterfeit thing at the time. Now that they have arrived, I cracked 2 of them open. They look like fakes to me.
Attached Images
File Type: jpg 1302Front1.jpg (67.0 KB, 355 views)
File Type: jpg 1302Front2.jpg (72.5 KB, 344 views)
File Type: jpg 3281Front1.jpg (77.4 KB, 338 views)
File Type: jpg 3281Front2.jpg (80.0 KB, 331 views)
File Type: jpg 1302Back1.jpg (78.4 KB, 335 views)
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Old 20th September 2009, 08:10 PM   #59
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More pics.
Attached Images
File Type: jpg 1302Back2.jpg (83.0 KB, 197 views)
File Type: jpg 3281Back1.jpg (87.7 KB, 142 views)
File Type: jpg 3281Back2.jpg (92.9 KB, 140 views)
File Type: jpg 1302Before1.jpg (95.3 KB, 153 views)
File Type: jpg 1302Before2.jpg (106.4 KB, 168 views)
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Old 20th September 2009, 08:13 PM   #60
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Last pic.
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File Type: jpg 3281After1.jpg (111.8 KB, 194 views)
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