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Old 15th December 2004, 10:09 AM   #1
djdamix is offline djdamix  France
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Default MJE15035 equivalent

I am looking for an MJE15035 equivalent. I use it for a VAS as I was told it is better than using a MJE350 (faster). I need 200V rating at least.

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David
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Old 15th December 2004, 12:33 PM   #2
MikeB is offline MikeB  Germany
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What's wrong about mje15035 ?
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Old 15th December 2004, 12:47 PM   #3
djdamix is offline djdamix  France
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It's very hard for me to get some in fact ... the only way seems to be to order directly to on semi ... 15$ just for transport ...

David
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Old 15th December 2004, 01:50 PM   #4
Eva is offline Eva  Spain
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MJE15032 and MJE15033 are rated at 250V Vce and are much more industry-standard than the newer MJE15034 and MJE15035 rated at 350V Vce

Check also MJE15030 and MJE15031, altough these are rated at 150V Vce. Remember that the lower voltage devices usually show better specs, so there is no point in using over-rated devices

Anyway, I wouldn't use these devices for a Vas. These are not smal signal transistors, these are medium/high power devices rated at Ic up to 8A, with big die sizes and big capacitances [ie: they are fast only when placed in low impedance high current circuits like an output stage]

MJE340 and MJE350 are probably a better choice for Vas [but far from perfect]. There are lots of suitable devices [most of them Japanese 2SA/2SC]. I think this subject has been already discussed on the forum
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Old 15th December 2004, 02:47 PM   #5
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Hi David, ideal transistor for VAS is " video " type 2SC3955( compl. 2SA1540 ) : Uceo = 200 V, Ic = 100 mA, ft = 300 MHz, TO 126 ML. Interesting is also price - cca 0.6 - 0.8 Euro.
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Old 15th December 2004, 03:01 PM   #6
MikeB is offline MikeB  Germany
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Here's a link to datasheet:

http://service.semic.sanyo.co.jp/sem..._e/2SC3955.pdf

Mike
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Old 15th December 2004, 03:25 PM   #7
djdamix is offline djdamix  France
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ok, thanks all for your inputs, I'll get that part & try

David
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Old 16th December 2004, 12:55 PM   #8
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Quote:
Originally posted by MikeB
What's wrong about mje15035 ?
That's what I was wondering.

I've tested my samples from OnSemi, and I was very impressed. The gains on my Mje15034 and 35 complementary transistors were very close to each other in gain. (~185-195 hfe in my meter that uses a low current to test)

So they only have a rated current of 4A, but they are being used as just drivers, so I doubt they will see much more than maybe 1A of current anyway, so I don't think getting 8A MJE15032 is necessary. If a bunch of current was needed, you should parallel the drivers anyway IMO to reduce gain droop.

Either way, those Onsemi transistors are very good, they are fast, and they handle up to 50W in a little TO-220 package.
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Old 16th December 2004, 01:21 PM   #9
djdamix is offline djdamix  France
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ok, sounds good ! I'll try to get some too. How much did you pay for the samples (only shipping ???) and long is it to receive some ?

Thanks.
Regards
David
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Old 16th December 2004, 01:56 PM   #10
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Quote:
Originally posted by djdamix
ok, sounds good ! I'll try to get some too. How much did you pay for the samples (only shipping ???) and long is it to receive some ?

Thanks.
Regards
David
You have to register a free account.

When you order samples, you pay for just the shipping.

I don't know how many you can order, but I ordered 25 each of 4 different kinds of transistor.
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