Single-channel transistor optocoupler with 3750Vrms isolation
The Renesas NEPOC PS2703-1-F3-A is a single-channel DC-input transistor-output optocoupler in a 4-SMD gull wing package (4-SOP supplier package). It provides 3750Vrms isolation between input and output, making it suitable for signal isolation in industrial controls, PLC I/O modules, motor drive feedback, and isolated power-supply monitoring where galvanic isolation is required between low-voltage control logic and higher-voltage power stages.
The current transfer ratio spans 50% minimum to 400% maximum, both specified at 5mA forward current. That 8:1 spread means the design must accommodate the weakest unit at end-of-life and temperature extremes. For a logic-level output, size the input resistor so the minimum CTR still saturates the output transistor with the chosen collector load. The 300mV Vce saturation maximum keeps the output swing within a logic low threshold for 3.3V and 5V rails.
Output voltage and current ratings
The output transistor is rated for 120V maximum collector-emitter voltage and 30mA continuous output current per channel. This covers 24V industrial logic rails, 48V telecom supplies, and low-side switching up to 120V DC. The 30mA limit is per-channel — if driving an LED or relay coil directly, confirm the load current stays under that ceiling including inrush.
The 10µs typical rise and fall times suit slow digital signals, status feedback, and DC-level isolation — not high-speed data or PWM above a few kHz. For faster switching, consider a logic-output optocoupler or digital isolator.