The reason I consider beta dc is because of test set up that gives graphic representation of beta lines. And I spose a wantingness that hF = high frequency. I have no empirical evidence on hand though.
I'll guess because the cascaded pair of transistors configuration was designed before the term Integrated Circuit was coined.
Righto, but I could get 100 - 3055s for $40. Hurts less when they go to smoke.
I see only 3 elements on the die. Bottom little square is base, upper larger fingers are emitter and collector is connected to can. Doesn't meet the definition of 2 transistors. ICBM (I could be mistaken)
Used almost exclusively in prototyping around my shed merely to prove theory of operation of untested circuits. If it works using a 3055, it will work with a rock with some wire wrapped around it. It did take more than the destruction of one unit to clue me in that trying to operate at nearly absolute maximum values is a not good practice.
I going to suggest that a darlington transistor will more resemble this device. This piece they said is counterfeit but its physical layout more matches my mental concept of a darlington. The way this device appears to be wired, it looks like two transistors in parallel.
But a darlington will have two individual die contained in a single package.
Maybe the wire bonders could not locate the wiring diagram so they just took their best shot. Wonder where they are working today.
I wondered about that but couldn't draw it out into a mental image that seemed workable. Also the few I have observed had two individual dies of equal (nearly) size. I'm still a little hazy on the interconnects. The base lead (let's say Q1) attaches to small pad which is surrounded by emitter of Q1, so that's one junction, then it looks like a single trace connects somewhere to the base of Q2 which I will guess is colored red and contacts the fingers of the emitter of Q2 forming another PN junction. Both collector regions are attached to the can and Bob's your uncle. It only makes sense that the mechanical structure has gone thru many design changes searching for better performance and maybe a savings in silicon. I'll give you that one. I just couldn't trace out the individual connection points. It's been a while since Barney, Fred, or myself have chopped open an enclosure to get to the bedrock. Might as well glue the top back on that one. :~)
According to Wikipedia, Sydney Darlington devised the Darlington pair transistor configuration in 1953.
