This bistable switch scr X0403DF 1AA2 thyristor manufactured from STMicroelectronics will turn on when a current is applied to it. This device has a surge current rating of 33 A. This product comes packaged in bulk, so the parts will be stored loosely. Its repetitive peak forward blocking voltage is 400 V, while its repetitive peak reverse voltage is 400 V. This SCR thyristor has an operating temperature range of -40 °C to 125 °C.