6N138M,6N139M,HCPL2730M,HCPL2731M are low input current high gain split darlington optocouplers from Fairchild Semiconductor Corporation, with features of low current, high CTR, high CMR, wide temperature range
The document describes the 6N138M/9M and HCPL2730M/31M optocouplers, which consist of an AlGaAs LED optically coupled to a high gain split Darlington photodetector. The split Darlington configuration allows for lower output saturation voltage and higher speed operation compared to conventional Darlington phototransistor optocouplers. Dual channel devices include an integrated emitter-base resistor for superior stability over temperature.
Key features highlighted include a low input current of 0.5mA, a superior current transfer ratio (CTR) up to 2000%, and exceptional common mode rejection of 10kV/us. The devices are designed for applications such as digital logic ground isolation, telephone ring detection, EIA-RS-232C line reception, and UP bus isolation. The datasheet provides absolute maximum ratings, electrical characteristics, switching characteristics, isolation characteristics, and typical performance curves.
| Average Forward Input Current | 20 mA |
|---|---|
| Peak Forward Input Current | 40 mA |
The typical input current is 0.5mA.
The device is guaranteed to operate from -40 to +100 °C.
The maximum common mode transient immunity at logic HIGH is 10,000 V/us.