Darlington output for high-gain isolation
The Renesas NEPOC PS2833-1-F3-A is a single-channel Darlington-output optocoupler in a 4-SOIC surface-mount package. It provides 2500Vrms galvanic isolation between a DC input LED and a Darlington phototransistor output, delivering a current transfer ratio (CTR) of 400% to 4500% at a forward current of 1mA. This high gain means a low LED drive current can switch a much larger output current — up to 60mA per channel — making it suitable for interfacing low-voltage logic to higher-voltage loads or for driving relays, solenoids, and PLC inputs in industrial control, motor drives, and power-supply feedback loops.
350V output — what it buys you
The collector-emitter voltage rating of 350V on the Darlington output lets this part switch loads on a high-voltage rail directly, without an external transistor stage. Common applications include driving a 24V or 48V industrial load from a 3.3V or 5V microcontroller pin, or providing isolated feedback in a 250V DC-link power supply. The 1V Vce saturation at 60mA means the output transistor drops about a volt when on — budget that drop in your load voltage calculation.
Speed and timing for the signal path
Rise and fall times are 20µs and 5µs typical, respectively. That puts this part in the low-speed optocoupler class — fine for DC-level sensing, relay coil drive, or 50/60 Hz mains zero-cross detection, but not for high-speed data or PWM above a few kilohertz. If your application needs faster switching, a phototransistor-output optocoupler (like the PS2801C-4-V-A) with 5µs rise/7µs fall times may be a better fit.
Housed in a 4-SOIC package (4.40mm width, supplier device package 4-SSOP), this part is a surface-mount component suited for automated assembly. Storage temperature exceeds the operating range, so the part can survive handling in a wider thermal envelope.