The OptoHiT FODM8801 is a new phototransistor utilizing ON Semiconductor's advanced proprietary process technology to achieve high operating temperature characteristics up to 125°C. This optocoupler consists of a gallium aluminum arsenide (AlGaAs) infrared light emitting diode (LED) optically coupled to a phototransistor in a compact half-pitch, miniature low-profile, 4-lead encapsulation. It provides high current transfer rate with very low input current. The input-output isolation voltage VISO is rated at 3750 VACRMS.