BT134W with SOT-223-4 is a TRIACs RoHS manufactured by Kang Yang. It is a quad bidirectional thyristor device. It is designed for AC switching applications and can be used for power control and phase control. It is RoHS compliant and designed for use with Logic Level Drive and has an MT2-Pin source and Gate pin. It has a maximum repetitive peak off-state voltage of 600V and a maximum on-state load current of 8A. It also has a turn-on time of 200µA and a guaranteed holding current of 5mA. Its maximum gate trigger voltage of 1.2V and a maximum of 1.8mA and can work up to a temperature range of -40? to +125?. It also has UL and CE certifications.