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Transistor? Answered

I am constructing the flyback driver found on the power labs website and cant get a 2N3055 transistor quite yet. I do, however, have a bag of transistors i pulled out of CRT monitors. I was wondering if one would be a good substitute for the 2N3055 for driving a new flyback, the number is C4916, the base-collector voltage is 1500 V and the Collector current is 7 Amp

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icengBest Answer (author)2012-01-26

The 2N3055 is a 60V  15A with a Min hfe = 20 at 4A.
It stands to reason 
the C4916 a 1500V  7A  with Min hfe = 8 at 1A or 4 @ 5A
is the wrong current and Gain

A.

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steveastrouk (author)iceng2012-01-26

And illustrated the trade off between Vce max and Hfe....

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kellyclark34 (author)2013-10-02
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steveastrouk (author)2012-01-26

:Look at the Hfe figure, at the expected operating current. If its the same (or preferably higher), you can use it.

The 2N3055 is a venerable device, there are better Darlington devices now.

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lemonie (author)2012-01-26

What you do is Google for "2N3055 datasheet", then do the same for the transistors you have and see if you can find a reasonable match.

L

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