The H11A1FM is marked obsolete by onsemi, meaning the manufacturer has ended production.
7500Vpk isolation for industrial signal separation
Rated for 7500Vpk isolation voltage, this optoisolator provides galvanic separation between a DC input and a transistor output — suitable for breaking ground loops in industrial control, PLC I/O, and motor drive feedback circuits. The 1-channel device comes in a 6-SMD gull wing package, surface-mount for automated assembly on a standard PCB footprint.
50% CTR at 10 mA and 2 µs switching
Minimum current transfer ratio of 50% at 10 mA forward current ensures the output transistor can saturate a logic input or relay coil with modest LED drive — a typical 5 mA to 20 mA forward current range covers most interface designs. Turn-on and turn-off times are 2 µs typical each, giving a combined switching speed adequate for 100 kHz data rates or PWM isolation up to about 250 kHz before duty-cycle distortion becomes significant. The output transistor is rated for 30 V maximum collector-emitter voltage with a saturation voltage of 400 mV at rated current — enough to drive 5 V or 24 V logic families with a pull-up resistor.