Snubberless™ Alternistor for inductive AC loads
The STMicroelectronics BTA16-400BWRG is a 16 A RMS, 400 V Snubberless™ Alternistor triac in a TO-220 through-hole package. It belongs to the Snubberless™ series, which means the device is designed to commutate inductive loads (motors, solenoids, transformers) without requiring an external RC snubber network — the die itself handles the dV/dt stress during turn-off. The 50 mA maximum gate trigger current (Igt) and 1.3 V maximum gate trigger voltage (Vgt) are standard for this current class and compatible with common optocoupler or logic-level drive circuits. The 160 A / 168 A non-repetitive surge current rating (Itsm at 50/60 Hz) gives headroom for inrush from lamp filaments or motor start.
The 400 V off-state voltage provides adequate margin for 120 VAC and 240 VAC mains lines, including the typical 10% overvoltage transients seen in industrial zones.
The BTA16-400BWRG is marked obsolete by STMicroelectronics. Date-code spreads vary by lot — we quote each lot individually against an RFQ, confirming original packaging and condition.