High voltage (120-180V) output drivers

[K-amps]

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

 

[cunningham]

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.

 

[jcx]

...and so far the MJE243 sound the most musical in that stage.

would that be "classic" or "new"

http://www.onsemi.com/pub/docs/pcn/13135.pdf

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?

 

[Easyamp]

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.

Cheers

 

[AndrewT]

Vce0 testing

Hi,
can someone tell us what circuit Easyamp used to test his transistors without destroying them?
And how to use/interpret the results?

 

[quasi]

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.

Cheers
Q

 

[john_ellis]

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).

cheers
John

 

[Eva]

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)

 

[ChocoHolic]

...recently started a personal love story with the 2SA1930 & 2SC5171 from Toshiba.

180V/2A/20W
Ft=200MHz
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!

 

[sajti]

2SC2911/2SA1209 from Sanyo, with TO-126 packages, and very very low capacitances. Nice, for VAS, and predrivers too

sajti

 

[destroyer X]

Eva's suggested transistors are very good.

Related the BD139, a very good unit, was used for many years as drivers to Radio Frequency transmitters operating up to 30 Megahertz.

I know about people that have used it to 100 Megahertz FM transmitters too...of course it will loose power in that frequency.

Till 100 Volts it is very good.

regards,

Carlos