The NTE5452 through NTE5458 are sensitive gate 4 Amp SCR’s in a TO202 type package designed to be driven directly with IC and MOS devices. These reverse−blocking triode thyristors may be switched from off−state to conduction by a current pulse applied to the gate terminal. They are designed for control applications in lighting, heating, cooling, and static switching relays.
 
Full spec sheet:
https://www.nteinc.com/specs/5400to5499/pdf/nte5452_58.pdf