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Old 13th June 2004, 01:33 PM   #1
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Default Complementary med pwr transistors?

Hi all,

I am looking for complementary med power transistors, min specs 100V min Vce, Icont min 100mA, Pav min 3W, prefarably no SMD, TO220 would be fine, I've got enough heatsink real estate.

Since I grew up with BD139 (which doesn't meet the Vce spec), and the BD239 (which has rather low Hfe), I'm a bit out of touch with the newest devices. They will be used in current mirrors in my new power amp. Any recommnedations?

Jan Didden
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Old 13th June 2004, 01:56 PM   #2
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Default Re: Complementary med pwr transistors?

Quote:
Originally posted by janneman


Since I grew up with BD139 (which doesn't meet the Vce spec), and the BD239 (which has rather low Hfe), I'm a bit out of touch with the newest devices. They will be used in current mirrors in my new power amp. Any recommnedations?
Hi

Hitachi 2SB649 / 2SD669
Case TO-126 - 180 Volts- collector current 1,5A-Power dissipation 20 W- hFE (60-320)- fT 140 Mhz

or Toshiba 2SC3298B / 2SA1306B
200Volts- 1,5A- 20W- hFE (70-240)- fT 100 Mhz

or Toshiba 2SA1837 / 2SC4793
230 V - 1 A- 20W- hFE (100- 320)- fT 70 Mhz

Regards
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Old 13th June 2004, 01:58 PM   #3
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how about the MJE340s??
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Old 13th June 2004, 01:59 PM   #4
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Jorge, muchos gracias!!

Jan Didden
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Old 13th June 2004, 02:01 PM   #5
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Quote:
Originally posted by li_gangyi
how about the MJE340s??

I'll check. Thanks.

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Old 13th June 2004, 02:17 PM   #6
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datasheet at
http://www.onsemi.com/pub/Collateral/MJE340-D.PDF
V(ceo) at 300V min...should fit your bill
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Old 13th June 2004, 02:20 PM   #7
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Yes, looks good. I will probably need to buy a 100 or so and select them, because they are for current mirrors, and they need to swing close to the supply so I don't want to use emitter degeneration to force an Ic match. I have no idea how close they would be in Vbe in a same-batch.

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Old 13th June 2004, 02:25 PM   #8
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Quote:
Originally posted by li_gangyi
datasheet at
http://www.onsemi.com/pub/Collateral/MJE340-D.PDF
V(ceo) at 300V min...should fit your bill
Strange!...not a word about fT in the data sheet...
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Old 13th June 2004, 02:55 PM   #9
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TIP31c 7 TIP32c. I think some other "TIP" series excluding the Darlington's would fit the requirements. A bit old fashioned but they do the job.

One advantage of the TO-220 package vs. TO-126 is for some applications the larger collector plate on the back provides sufficient dheat dissapation without adding a clip on sink.
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Old 13th June 2004, 03:57 PM   #10
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Yes, thanks, I forgot those, I have used these many years ago, I seem to remember that they had relatively low Ft and *very* low Hfe above a 100 mA Ic. I'll check it.

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