In practice the junction temperature would be much higher than this so a practical maximum current at 40VCE would be around 1.5A. See figure 2 of the 2N3055/MJ2955 data sheet: From this you can see that at 40VCE the 15A, 2N3055 can only handle 3A at temp case = 25 degC. In addition to the maximum junction temperature of a transistor, you need to keep an eye on the safe operating area (SOA).
I should be running around 60 C (or not ?) The thermal resistance junction to case is 1.5 C/W. Extrapolating his results I should be able to draw 39W per 2N3055 at about 40C case temperature or less. Metal to metal with compound was by far the best. Quite a down to earth approach but unfortunately nothing with metal to metal with heat compound - AND fan. I may fit a 150mm 0.4A fan if the 125mm doesn't cover the heat sinks. 1 heat sink per 2N3055 in an x pattern under a 125mm 0.5A fan blowing from outside the case down the heat sink fins with a 30mm gap at the bottom. I thought 3A from the transformer a safe limit. I was considering using 4 x 2N3055's each at about 0.75A at 52V (39W each). Do you have questions related to any of the parts listed on our website? If so, our experienced sales reps are here and eager to help you in any way they can.On her page is a link to the circuit that states she removed the 0.1 Ohm 10W resistors as it limited her current output. National stock numbers can have multiple part numbers under it depending on whether it has multiple manufacturers for the same part. The national stock number, applied to part number 2N3055, is a label that informs consumers that the part is being used, stocked, and distributed within the federal supply system. This results in little to no downtime in the ordering process. ASAP Semiconductor is known for providing outstanding quality control and fast shipping to our customers.
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