800 V off-state, 25 A RMS — phase-control SCR for mains-powered loads
The STMicroelectronics TYN825RG is a standard-recovery SCR (silicon-controlled rectifier) in a TO-220-3 through-hole package, rated for 800 V off-state blocking and 25 A RMS on-state current. It is designed for phase-control applications such as motor speed controllers, lighting dimmers, power supplies, and AC switching where a robust, medium-current thyristor is needed.
16 A average, 300 A surge — thermal and inrush headroom
With a 16 A average on-state current and a non-repetitive surge rating of 300 A at 50 Hz / 314 A at 60 Hz, this SCR can handle capacitor inrush or short-circuit pulses that would weld a smaller device. The 1.6 V maximum on-state voltage sets the conduction loss floor: at 16 A average, expect roughly 25 W dissipation before the heatsink — budget a TO-220-rated sink for continuous use above 10 A.
Gate trigger and hold current — drive circuit compatibility
The gate requires a maximum trigger current of 40 mA and 1.3 V to latch — well within the output capability of a standard optocoupler or small-signal transistor. Once latched, the 50 mA maximum hold current means the SCR stays on until the load current drops below that threshold, which is typical for resistive and inductive loads. The 5 µA maximum off-state leakage is negligible in most designs.
Industrial temperature range, active production
The lifecycle status is active, meaning ST still manufactures it — no last-time-buy risk.