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4th August 2009, 04:45 PM
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#101 | |
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diyAudio Member
Join Date: Oct 2007
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Quote:
The 250W rating comes from the fact that Tj(max) of the TO-3 cased devices is 200C, not 150C as in the flatpacks. R(th) is comparable. The most likely scenario is that 1302/3281 dies were used, in TO-3 cases with larger (or multiple) bond wires to allow a higher current rating. Most dies can be selected for higher Vceo, so a 250V or more rating is not out of line. If you buy enough of them they'll put them in any package you want, and for a price will do any testing and grading within reason. |
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