PC817 Optocouplers PC817C in DIP-4 Format
The PC817C (DIP-4) is a high-performance, single-channel optical isolator engineered to provide electrical isolation and signal coupling between high-voltage power circuits and sensitive low-voltage microcontrollers. Featuring a high-efficiency infrared light-emitting diode optically coupled to a high-voltage NPN phototransistor in a compact 4-pin Dual In-Line Package (DIP-4), the module allows logic signals to cross power domains while blocking high-voltage transients, electrical noise, and ground loops up to an isolation voltage of 5000V RMS. The "C" grade designation denotes a tightly controlled Current Transfer Ratio (CTR) range of 200% to 400%, ensuring high sensitivity and reliable switching performance at low input drive currents (I F=5mA). With a maximum collector-emitter voltage ( rating of 80V and fast switching response times, the PC817C is an industry-standard component for noise isolation, switching power supply feedback circuits (SMPS), programmable logic controller (PLC) I/O interfaces, solid-state relays, and protecting GPIO lines on Arduino, ESP32, and STM32 platforms from high-voltage inductive loads.
