ever suggest using obsolete transistors for new builds, and for repairs you are generally better off with more modern devices. If you buy any obsolete device, it's essential to run a SOA (safe operating area) test (see Semiconductor Safe Operating Area). When subjected to even a fraction of the rated power, the die will fail. It's certainly utterly incapable of withstanding 15A or a maximum dissipation of 150W - the die is simply way too small. The tiny die is typical of all counterfeit power transistors. The above photo was sent to me in July 2018, and the transistors were purchased from ebay. Most sellers insist they are 'genuine', but this is presumably a 'new meaning' of the word, of which I was previously unaware. Certainly, I could find no mainstream supplier listing them, but (naturally) they are all over ebay, and they aren't cheap there either. I'm unsure why, but there seem to be people selling (and buying) these transistors, despite the fact that they appear to have been rendered obsolete around 2003 or thereabouts.
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