The NTE5408 through NTE5410 sensitive gate SCRs are designed to be driven directly with IC and MOS devices. These SCRs feature proprietary, void−free glass−passivated chips and are hermetically sealed in TO5 type packages. These 4A devices are available in voltages up to 600V and with a gate current of 200μA.
These NTE SCRs are reverse−blocking triode thyristors and may be switched from off−state to conduction by a current pulse applied to the gate terminal. The NTE5408 through NTE5410 are designed for control applications in lighting, heating, cooling, and static switching relays.
 
Full spec sheet:
https://www.nteinc.com/specs/5400to5499/pdf/nte5408_10.pdf