MJE 340 / MJE 350 (MJE340/MJE350) and BD159 - GBP (Transit frequency fT) unknown? - diyAudio
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Old 27th August 2009, 11:11 AM   #1
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Default MJE 340 / MJE 350 (MJE340/MJE350) and BD159 - GBP (Transit frequency fT) unknown?

there are various datasheets, but I don't find informations about the transit frequency
http://www.onsemi.com/pub_link/Collateral/MJE340-D.PDF
http://www.onsemi.com/pub_link/Collateral/MJE350-D.PDF
http://www.onsemi.com/pub_link/Collateral/BD159-D.PDF
http://www.datasheetcatalog.com/data.../5/BD159.shtml
What could be the reason for this? Thank you very much for your advices
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Old 27th August 2009, 12:47 PM   #2
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Strange, I checked and the Fairchild and ST versions also have very brief (4 pages) datasheets, almost like they copied each other's documentation..

I think something like fT=10MHz for the MJE340/350? Rugged but slow...

regards,

Len.
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Old 27th August 2009, 01:01 PM   #3
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tiefbassuebert,
who knows, missing information about transition frequency, Cob and some other characteristics of importance, cannot be very linear anyway, better avoided.
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Old 27th August 2009, 01:01 PM   #4
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Goole result:
http://www.datasheetarchive.com/down...2FDSA-9230.pdf

Mike
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Old 27th August 2009, 01:04 PM   #5
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The 10MHz is the number for the 350, fT of the 340 is twice as high on average.
fT numbers for the 340/350 have been tested/posted quite of few times. At diyA, search for posts of either JCX, Andy_C or Pierre Lacombe.

Sort of an attitude like : more than sufficient for the intended purposes. The ones who use them for designs/projects do seem to hold that view. (=> as well. Gawd, how i love to make fun of folks )

Last edited by jacco vermeulen; 27th August 2009 at 01:09 PM.
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Old 27th August 2009, 01:10 PM   #6
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This was rather interesting. ON has fT for most parts except for MJE340!
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Old 27th August 2009, 01:29 PM   #7
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Quote:
Originally Posted by Lumba Ogir View Post
tiefbassuebert,
who knows, missing information about transition frequency, Cob and some other characteristics of importance, cannot be very linear anyway, better avoided.
Nevertheless I find this types in a wide range of high end audio amplifiers in the second voltage gain stages (pre-driver). The question is mainly for me, that is the best value of idle current for this types
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Old 27th August 2009, 01:52 PM   #8
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Jacco,
it depends on the intended purposes and expectations. The 2SC3600/2SA1406 is better, 300MHz@10mA, Cob 1.4/1.7pF, hardly beatable linearity, due to some adoption and diffusion processes. How many do you have in stock?
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Old 27th August 2009, 02:22 PM   #9
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tiefbassuebertr,
Quote:
Nevertheless I find this types in a wide range of high end audio amplifiers in the second voltage gain stages (pre-driver).
It does not prove anything.
Quote:
The question is mainly for me, that is the best value of idle current for this types
Hard to say in absence of info, I consider them as switch transistors. (No good for audio).
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Old 27th August 2009, 02:42 PM   #10
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Quote:
Originally Posted by Lumba Ogir View Post
How many do you have in stock?
Master Dolphin,

of the 340/350 absolutely none, i hope.
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