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Old 7th April 2011, 03:43 PM   #1
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Default original transistor data bank-useful data

the following info is extracted from TRANSISTORES ORIGINAIS - BANCO DE DADOS [Arquivo] - HT Forum
(brazilian, portuguese content)

orientative capacitance
base emitter base collector

Motorola
MJL21193 7 nF 2,1 nF
MJL21194 6,8 nF 2,5 nF
Toshiba
2sa1943 6,1 nF 3,1 nF
2sc5200 13.5 nF 13 nF
Sanken
2sc2922 10.5 nF 6.2 nF
2sa1216 9 nF 3.5 nF
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Old 7th April 2011, 04:13 PM   #2
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Default ...intel inside...

I bought this ******* yesterday... suspecting a dead rat inside, I did a search that led me to the brazilian forum...
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Old 7th April 2011, 04:26 PM   #3
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Default some more data

a pair of originals that I have measure close to the data of the brazilian forum

the fakes not even close...


orientative capacitance, base collector/base emitter


2sa1943 6,1 nF 3,1 nF
2sc5200 13.5 nF 13 nF
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Old 7th April 2011, 05:03 PM   #4
WuYit is offline WuYit  Sweden
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Yet some people say fakes are just as good...
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Old 7th April 2011, 11:57 PM   #5
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The values posted are informative. Easy accesible by using a tester with capacitance measurement fixture.

This are not the last word in accuracy, -the component is measured in a rough manner, out of the circuit-.

But useful enough for ¨in the field¨ usage, ie, when shopping parts, or when dealing with suspecting ones...

Thanks to this data, I have avoided harm to drivers and circuitry of a nice vintage amp, plus some profane wording...

Now, time to get a refund...
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Old 8th April 2011, 03:15 PM   #6
WuYit is offline WuYit  Sweden
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This one is better...
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Old 8th April 2011, 03:59 PM   #7
ilimzn is offline ilimzn  Croatia
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One of the clues is that the beta ranking mark is not right. Subtle changes in marking are often used to avoid lawsuits ('see, this marking is not the same, therefore we did not attempt to make a fake, just an equivalent').
The one shown by WuYit is what some manufacturers will sell as 'second source', however the specs are only similar, not the same (in particular, current and voltage tend to be the same but capacitances, gain and SOA are not, usually it's recycling older parts such as MJ15003/4).
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Old 8th April 2011, 04:56 PM   #8
HighTec is offline HighTec  Croatia
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Quote:
Originally Posted by WuYit View Post
This one is better...
What do you mean? That transistor looks genuine to me. You know something we don't?
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Old 8th April 2011, 05:12 PM   #9
jaycee is offline jaycee  United Kingdom
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WuYit was making a point - "this one is better", because it's what an original Sanken transistor looks like
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Old 8th April 2011, 05:34 PM   #10
HighTec is offline HighTec  Croatia
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He confused me. Well, I bought bunch of these SanKen's 2SA1295/2SC3264 from Lily Electronics Salon and haven't found any problems. I even smashed one and he looks exactly as that transistor shown on WuYit's picture. But goddamn paranoia, I thought WuYit knows something we don't. He probably had a bad experience with Electronics Salon? Like I said, goddamn paranoia.
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