The 6N138M/9M and HCPL2730M/31M optocouplers consist of an AlGaAs LED optically coupled to a high gain split Darlington photodetector. This split Darlington configuration separates the input photodiode and first-stage gain from the output transistor, allowing for lower output saturation voltage and higher operating speed than conventional Darlington phototransistor optocouplers. In the dual-channel devices HCPL2730M/HCPL2731M, an integrated emitter-base resistor provides excellent stability over temperature. The combination of very low input current of 0.5mA and high current transfer ratio of 2000% makes this series ideal for MOS, CMOS, LSTTL and EIA RS232C input interfaces while ensuring output compatibility to CMOS and high fanout TTL requirements. Internal noise shielding provides excellent 10 kV/µs common-mode rejection.
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