1858-0044 ?

[brouhaha]

(09-28-2023 12:46 AM)teenix Wrote:  There are lots of mentions of cross references to the Allegro TPQ3904 which I think is wrong as these are rated at 200mA, and not sufficient considering the 500mA heads.

It's possible that a TPQ3904 would be satisfactory due to the duty cycle, but I wouldn't count on it.

Why not just use discrete PN2222A transistors? That's the TO-92 equivalent of the 2N2222A (TO-18 metal can).

Quote:There is a cheaper surface mount part but would need a carrier PCB to convert to through hole mounting.

If you did build a carrier board, four MMBT2222A surface mount transistors would be much cheaper than any quad transistor package.