MJE340 MJE350 detalied data, more than the datasheet - diyAudio
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Old 15th November 2002, 09:03 AM   #1
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Default MJE340 MJE350 detalied data, more than the datasheet

MJE340/350, does anybody have more data about these? I have looked at Thomson and ON. They say nothing about fT, caps or other frequency properties.

The current gain is >30, typ 240. Does anybody know what the real life value is (in average)?

I'm thinking of testing these transistors in my QRV-02 headphone amp. Now I use BD139, 140, good old work horses.
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Old 15th November 2002, 09:58 AM   #2
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You haven't considered the newer Toshiba drivers 2SA1837 and 2SC4793? They have a typ. fT of 100MHz and are available from Elfa, although a bit more expensive than the MJEs. See http://www.elfa.se/elfa/produkter/se/20/2022252.htm

I have considered using these instead of 2SB649/2SD669 which
are now discontinued from Elfa (not from the manufacturer, though).
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Old 15th November 2002, 10:19 AM   #3
halojoy is offline halojoy  Sweden
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Default SOT186

Is SOT186 an insulated case?
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Old 15th November 2002, 10:27 AM   #4
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Default Re: SOT186

Quote:
Originally posted by halojoy
Is SOT186 an insulated case?
The datasheets don't say anythinhg about that. However, I
found this on the net http://www-us9.semiconductors.com/cg...package/SOT186 so assuming that Toshiba and Philips
agree on what SOT186 is, then it is insulated.
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Old 15th November 2002, 10:44 AM   #5
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Quote:
Originally posted by Christer
You haven't considered the newer Toshiba drivers 2SA1837 and 2SC4793? They have a typ. fT of 100MHz and are available from Elfa, although a bit more expensive than the MJEs. See http://www.elfa.se/elfa/produkter/se/20/2022252.htm

I have considered using these instead of 2SB649/2SD669 which
are now discontinued from Elfa (not from the manufacturer, though).
My interest was only "do they work". I have those and they are like replacements for BF471/472, high power amp drivers.

The last question: No, my goal is to use easy-to-get-parts, in Sweden Elfa. But since the output stage aren't very special, there are lots of room for experiment.
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Old 15th November 2002, 10:46 AM   #6
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Lightbulb Re: MJE340 MJE350 detalied data, more than the datasheet

Quote:
Originally posted by peranders
MJE340/350, does anybody have more data about these? I have looked at Thomson and ON. They say nothing about fT, caps or other frequency properties.

The current gain is >30, typ 240. Does anybody know what the real life value is (in average)?

I'm thinking of testing these transistors in my QRV-02 headphone amp. Now I use BD139, 140, good old work horses.
peranders,
As they don't give Ft it is probably < 3MHz i.e. slow or general purpose transistor.
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Old 15th November 2002, 11:06 AM   #7
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Default Re: Re: MJE340 MJE350 detalied data, more than the datasheet

Quote:
Originally posted by Elso Kwak

peranders,
As they don't give Ft it is probably < 3MHz i.e. slow or general purpose transistor.
Yes (but I'm not sure, haven't tested), but it's rather unusual not to give the fT at least.
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Old 16th November 2002, 12:19 PM   #8
PH104 is offline PH104  United States
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Peranders

I replied to you in more detail in AudioAsylum. Yes, they will work.
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Old 16th November 2002, 04:00 PM   #9
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Peranders,

I have measured Ft for this transistors some years ago.

Results were 20 to 30 Mhz for MJE340, but 8 to 12 for MJE350.
They work very well as drivers for Mosfets, but only as "up" transistor in cascode configuration. Or as constant-current source or sink.


Regards, Pierre Lacombe.
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Old 16th November 2002, 05:47 PM   #10
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Thank you for the measurements.
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