The STSID140-12 from STMicroelectronics is an Isolated Thyristor Driver IC that has been designed for AC switch SCRs and Triacs. It requires an input voltage of 3.14-3.47 V and provides an output current of 40 mA. This gate driver consists of a UVLO protection, H-bridge driver, oscillator and other components. Its insulated voltage up to 1.25 kVRMS gives functional insulation to drive any thyristor in an industrial application. This AC switch-insulated driver ensures high load current switching, making the plug-and-play interface between the MCU and SCR/Triac. It operates from a single 3.3 V supply for direct MCU drive, supporting a maximum junction temperature of 125 °C, and features a low quiescent standby current of just 5 µA. It is available in a surface-mount package that measures 5.35 x 3.45 mm and is suitable for general-purpose AC line load switching, inrush current limiting circuits for industrial SMPS and UPS, heating resistor control, solid-state relays, and motor control circuits and starters.