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-   -   My Transistors, original or copy? (http://www.diyaudio.com/forums/parts/82638-my-transistors-original-copy.html)

anatech 5th July 2006 11:53 AM

My Transistors, original or copy?
 
This thread intended to be an information resource for all. Please post measured data and photos for complimentary pairs in one post. The data will be condensed so we have a single post for each type to make things easy to look up. It will be a sticky.

I would like to thank MikeB for encouraging the creation of this resource, and all the members who have collected and posted information previously. Also the members who post new data. We will condense new information into a pre-existing post for the type number. All O.T. posts will be removed to keep this thread clean and useful.

My hope is that this thread will assist members in their semiconductor purchases. Another thread on this can be found here.

-Chris

anatech 5th July 2006 02:00 PM

Mjl4281 / Mjl4302
 
Data from here:
Quote:

MJL4281
11.45
11.03
11.81
11.07
12.08

MJL4302
10.94
10.95
10.94
10.99
10.92
I would average these out to 11.5 nF for MJL4281 and 10.9 nF for MJL4302. Anything close (within the tolerance of your own tester) should indicate a real part. The current gain figures would be nice to have. We will add them if they become available.



-Chris

EDIT: Capacitance values are taken from base to emitter with no DC bias, excitation voltage is around 100 mV rms. I normally use 1KHz or 10 KHz.
Thanks to Netlist for pointing this omission out.

anatech 5th July 2006 02:00 PM

Mjl4281 / Mjl4302
 
Reserved for pictures

MikeB 5th July 2006 07:10 PM

Pictures for MJLs
 
2 Attachment(s)
I will show pictures of MJL0281A/0302A as all MJLs from OnSemi look the same. I found no significant difference to other MJLs.
They should be good as reference to all TO-264 from OnSemi.

These have been aquired through the OnSemi sample program. (Not ROHS conform yet)

Mike

MikeB 5th July 2006 07:28 PM

Mje 15030/15031
 
2 Attachment(s)
Data:

- hfe should be 100 - 150 (20v/50ma)
- capacity (to follow, i have no capacitance meter)

Pictures:

It's likely that all TO220AB cases from OnSemi look the same.


These have been aquired through the OnSemi sample program. (Not ROHS conform yet)

Mike

MikeB 5th July 2006 07:58 PM

Toshiba SC5200/SA1943
 
2 Attachment(s)
Data:

not measured yet (to come later)

Pictures:

It's likely that all newer TO247 cases from Toshiba look the same.
(Older cases are green/black)

These have been aquired from DigiKey. (Not ROHS conform yet)

Mike

EchoWars 17th July 2006 11:47 AM

Some oldies...
 
Capacitance measurements for a few classics...these are likely the most counterfeited Japanese transistors around. These are known original Toshiba and NEC devices.

Anyway...

2SB600
1.62nf
1.69nf
1.67nf
1.56nf
1.67nf
1.62nf

2SD555
3.69nf
2.40nf
2.45nf
2.35nf
2.53nf
2.43nf

2SB554
2.27nf
2.20nf
1.95nf
2.55nf
2.26nf
1.95nf

2SD424
2.55nf
2.48nf
2.61nf
2.32nf
2.52nf
2.49nf

Measured with a BK Precision 815 component tester, base-emitter diode reverse-biased

Just for fun, I have some counterfeit 2SD555's and 2SB600's that have not been opened or destroyed.

Counterfeit 2SB600's
1.78nf
1.79nf
1.79nf
1.78nf

Counterfeit 2SD555's
1.26nf
1.28nf
1.29nf
1.25nf

I know for a fact that the ones I tested as good are indeed good, as they are pulls from vintage gear. I also know that the ones I tested as counterfeit are indeed fakes, but I admit that it is annoying that the fake 2SB600's test as close to the original ones as they do...

Excellent thread, BTW...

anatech 2nd August 2006 05:54 PM

MJW0302A / MJW0281A
 
2 Attachment(s)
Just got some more from a new batch. These are great!
hFE measures just under 100 for all, NPN's maybe one or two counts higher on average.

B-E capacitance is going to average 7.6 nF with the PNP slightly lower by a couple counts (so far).

Here is another picture of both types ......

anatech 2nd August 2006 05:59 PM

Mje340 / Mje350
 
2 Attachment(s)
Here are some oldies (new stock).

MJE340 B-E capacitance averages 278 pF, hFE around 100

MJE350 B-E capacitance looking like 370 pF, hFE around 120 (fewer samples).


A shot of real, fresh On Semi parts .........

anatech 2nd August 2006 06:03 PM

MJ15003 / MJ15004
 
2 Attachment(s)
Some more older numbers (brand new stock).

MJ15003G hFE averages 45 ~50, B-E capacitance around 3.65 nF

MJ15004G hFE averages 180 ~190, B-E capacitance around 3.55 nF

I wish the hFE figures were closer between NPN and PNP.


Another mug shot for you .........


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