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High voltage (120-180V) output drivers
High voltage (120-180V) output drivers
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Old 30th September 2004, 12:53 AM   #21
K-amps is offline K-amps  United States
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If I remember correctly fT of both is 30Mhz and the hfe of both is 50 minimum.

The 15030/31 has inferior values than the 2/3/4/5
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Old 30th September 2004, 01:12 AM   #22
cunningham is offline cunningham  United States
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Default Hi Current???

I know that this thread is labled high voltage.

But, I would like to get some feedback on 2N5684/2N5685. Didn't want to make a whole new thread for this. These are something like 80V max, but are quite hefty when it comes to current. This device as I under stand can conduct 50A I was wondering what the maximum LINEAR operating current is. I am estimating at or around 9-10A. Does anyone have any data sheets for these devices? (cross referenced to ECG 29 and ECG 30). Beta is around 15-20

Thinking of making a hi power sub amp, Hee Hee.....Thinking class G.
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Old 30th September 2004, 04:40 AM   #23
jcx is offline jcx  United States
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Originally posted by ppl
...and so far the MJE243 sound the most musical in that stage.

would that be "classic" or "new"


i find it interesting the product change notice assures no parameter changes, how do capacitance and transient/ max thermal parameters not change with die shrink?
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Old 7th October 2004, 03:22 PM   #24
Easyamp is offline Easyamp
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I use mje243/253 as vas and drivers and they seem to work well and for only $.38. The 100v vce rating is very padded. In my vce tester, which is a 340v (originaly 170v) 25ua supply I recently built to find an unknown transistor's vce, I found that transistors are rated for the worst possible vce. I have a 130v 2n3906 while most were 50 or so.

I have 30 something pairs of mje243/253 and the ones tested were all much above there 100v rating more like 160v.

I don't know exactly what this means but I did use a few controll transistors and found most would go 5 - 10% higher then there rated vce so whatever results I get I just subtract 10%.

The tester is an up down 120v 240v transformer rectified, with a 25ua 2n6517 ccs load.

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Old 2nd March 2007, 08:35 AM   #25
AndrewT is online now AndrewT  Scotland
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Question Vce0 testing

can someone tell us what circuit Easyamp used to test his transistors without destroying them?
And how to use/interpret the results?
regards Andrew T.
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Old 2nd March 2007, 02:22 PM   #26
quasi is offline quasi  Australia
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I might be simple, but I use MJE340 /350's almost all the time. Cheap and available almost everywhere.

And they're tough little buggers.

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Old 2nd March 2007, 09:11 PM   #27
john_ellis is offline john_ellis  United Kingdom
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Hi all

The BD139/140's are good for up to 100V but not higher.

The best I've used so far for higher rails are the 160V 2SA968/2SC2268. These were Toshiba's originally, but are now supplied by Magnatec, available from RS. Last time I saw RS description still had Toshiba listed as the manufacturer. Must let them know this is wrong!

Magnatec appear to make "close equivalents". From my knowledge of the fab company I would be surprised if they have not done a good job at providing a good match to the Toshiba's. Have not got a Magnatec data sheet, but frequency response is similar to BD139/140 as measured at 1 MHz (this doesn't say much though).

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Old 3rd March 2007, 05:58 AM   #28
Eva is offline Eva  Spain
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A pair of complementary high voltage drivers that deserve mention are 2SA1837 and 2SC4793.

max. Vce=230V
max. Ic=1A (very linear up to 0.3A)
Ft=70/100Mhz (PNP/NPN)
TO-220 plastic case
Output capacitance=30/20pf (PNP/NPN Vcb=10V F=1Mhz)
I use to feel like the small child in The Emperor's New Clothes tale
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Old 3rd March 2007, 12:51 PM   #29
ChocoHolic is offline ChocoHolic  Germany
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...recently started a personal love story with the 2SA1930 & 2SC5171 from Toshiba.

Cob: 16pF(NPN), 26pF(PNP)
Typical gain around 200
Fully isolated TO220

I am not sure if you still find a source...
If yes, then try these devices!
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Old 3rd March 2007, 03:19 PM   #30
sajti is offline sajti  Hungary
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2SC2911/2SA1209 from Sanyo, with TO-126 packages, and very very low capacitances. Nice, for VAS, and predrivers too

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