MJE 340 / MJE 350 (MJE340/MJE350) and BD159 - GBP (Transit frequency fT) unknown?

tiefbassuebertr · 27th August 2009, 10:11 AM

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

len_scanlan · 27th August 2009, 11:47 AM

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.

Lumba Ogir · 27th August 2009, 12:01 PM

tiefbassuebert,
who knows, missing information about transition frequency, Cob and some other characteristics of importance, cannot be very linear anyway, better avoided.

ZeneBona · 27th August 2009, 12:01 PM

Goole result:
http://www.datasheetarchive.com/down...2FDSA-9230.pdf

Mike

jacco vermeulen · 12:09 PM

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

)

peranders · 27th August 2009, 12:10 PM

This was rather interesting. ON has fT for most parts except for MJE340!

tiefbassuebertr · 27th August 2009, 12:29 PM

Quote:

Originally Posted by Lumba Ogir

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

Lumba Ogir · 27th August 2009, 12:52 PM

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?

Lumba Ogir · 27th August 2009, 01:22 PM

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).

jacco vermeulen · 27th August 2009, 01:42 PM

Quote:

Originally Posted by Lumba Ogir

How many do you have in stock?

Master Dolphin,

of the 340/350 absolutely none, i hope.

27th August 2009, 10:11 AM	#1
tiefbassuebertr diyAudio Member Join Date: Jul 2005 Location: D-55629 Schwarzerden	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

27th August 2009, 12:01 PM	#4
ZeneBona diyAudio Member Join Date: Apr 2007	Goole result: http://www.datasheetarchive.com/down...2FDSA-9230.pdf Mike __________________ ZeneBona

27th August 2009, 12:04 PM	#5
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	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 12:09 PM.

27th August 2009, 12:10 PM	#6
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	This was rather interesting. ON has fT for most parts except for MJE340! __________________ /Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work \|Thread

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27th August 2009, 11:47 AM	#2
len_scanlan diyAudio Member Join Date: Dec 2004 Location: Melbourne, OZ	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.

27th August 2009, 12:01 PM	#3
Lumba Ogir Banned Join Date: Apr 2005 Location: Stockholm	tiefbassuebert, who knows, missing information about transition frequency, Cob and some other characteristics of importance, cannot be very linear anyway, better avoided.

27th August 2009, 12:52 PM	#8
Lumba Ogir Banned Join Date: Apr 2005 Location: Stockholm	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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