The BT148-400R.127 is a Thyristor Discrete Semiconductor Module manufactured by NXP. It is an 800V, 14A logic level gate, three phase, 400A, TO-247AC package with reverse conducting, four-quadrant, light-activated and thermally self-protected thyristors. This device is ideal for voltage and current control in industrial, commercial and consumer applications such as AC motor drives, power converters and lighting systems.