Sensitive-gate SCR for low-power line switching
The STMicroelectronics X00602MA 1AA2 is a sensitive-gate SCR in a through-hole TO-92-3 package, rated for 600 V off-state blocking and 800 mA RMS on-state current.
200 µA gate trigger — direct logic drive
The 200 µA maximum gate trigger current (Igt) and 800 mV maximum gate trigger voltage (Vgt) mean this SCR fires reliably from a logic output through a simple series resistor.
Holding current and off-state leakage
Maximum holding current (Ih) is 5 mA — the minimum load current needed to keep the SCR latched after the gate pulse ends. Below 5 mA the device will commutate off. Off-state leakage at rated voltage is 1 µA max, which matters for standby-power budgets in always-on equipment.
Supplied in a Bag, the TO-92-3 through-hole package suits point-to-point wiring on perfboard, socketed breadboard prototypes, or wave-solder assembly on single-sided PCBs.
For dual-sourcing resilience, the XL0840 is a functional peer — same sensitive-gate SCR type, through-hole package, and -40°C to 125°C temperature range, but rated at 400 V off-state instead of 600 V. Verify the voltage margin before substituting. The TS420-600T shares the 600 V and 200 µA Igt ratings but ships in a Tube rather than Bag.