This part is an OPTOsupply OP156 OPTOPOLLAR High-Speed Switching Silicon Phototransistor. It is a low-cost and high-speed switching silicon NPN phototransistor, specifically designed for the efficient, high-speed switching of automotive, industrial, and optical and sensing applications. It has outstanding high-speed response characteristics and maximum collector-emitter voltage of 30V. It features a fast-switching diode designed for uninterrupted switching over a wide range of conditions. The OP156 offers a fast-switching time up to 1µs and short circuit currents up to 100mA, making it a suitable choice for various automotive, industrial, and sensing applications.