The T405-800B-TR is a triac from STMicroelectronics. It is a four quadrant silicon bidirectional switch designed for AC switching applications. This triac has a current rating of 400V, 25A and a voltage rating of 800V. It contains a Hermetic seal for moisture resistance. The T405-800B-TR has a Gate trigger current of 5mA Max, holding current of 0.1mA Max, and a Switching Voltage of 1.67V Max. This product is RoHS compliant and lead-free.