I'm having trouble finding what I want due to the way mouser.com limits searching on BJTs. I'm trying to find out if anyone manufacturers a medium to high power BJT with a gain of at least 30. The higher the better. The classic 2n3055 has a minimum gain of 20. I want something higher if possible. Does anyone know if there's anything out there with such high gain and also moderately high current capability?
The Motorola MRF454 is an RF power transistor. The datasheet says it is intended for operation up to 30 MHz, calls out minimum hFE of 40, and says the device is rated for 80 watts power out.
This is probably not what you want if you are looking for a high-gain 2N3055, as the 2N3055 is intended for DC operation. It is a linear power supply pass transistor.
This question was a poor question... formed from misinformation I read on another electronics site. Recommendation was to always use minimum Hfe in doing calculations. When I look at transistor curves on datasheets, it appears that the recommendation is misleading.
Maximum Hfe occurs in a range of low base current. At a certain 'grey area', as base current further increases, collector current doesn't increase as much. That means the minimum Hfe is only a factor when trying to drive a transistor full on. It's also somewhat of a conundrum since a BJT is never technically 'full on' (as you'd get with a FET). The Hfe simply gives diminishing returns that approach zero once you are pushing enough base current. Since you get diminishing returns, it's not quite realistic to just pick a certain value to turn the transistor full on and then aim for it.
I'm less concerned with minimum Hfe now -- as it's only a rough guide in power transistors.
This comes out of me having had a lot more experience with FETs than BJTs, so I didn't quite have a proper view of things.