BT139B-600,118 is a discrete thyristor manufactured by NXP. It is a unidirectional triggering device designed for use in switching, phase control and protective applications. The thyristor has an OFF-state voltage of 600V, a trigger current of 1A and a nominal junction temperature of 125°C. It features high surge capability, cell-to-cell conduction temperature tracking, temperature and time dependent blocking and low EMI susceptibility, making it suitable for all kinds of DC-to-AC, AC-to-AC, and DC-to-DC switching applications including motor control and power conditioning.