On Tue, 9 May 2023, Peter Coghlan wrote:
Also, this device is a not just a straighforward transistor.  It's data sheet
says it is a package containing two transistors and some other components,

That's a Darlington power transistor with freewheeling diode and biasing resistors for the second base. I really wonder why that fact has been unmentioned, yet.

Christian

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