7500Vpk isolation in a 6-SMD Gull Wing
The onsemi H11A3FR2VM is a single-channel optoisolator pairing a DC-input LED with a phototransistor output, delivering 7500Vpk isolation between primary and secondary sides. That isolation rating covers reinforced insulation requirements in industrial control, motor drives, and medical equipment where galvanic separation is mandatory for operator safety. Housed in a 6-SMD Gull Wing package, the part is designed for surface-mount assembly on standard PCB footprints — the Gull Wing leads provide visual solder-joint inspection clearance and mechanical compliance across thermal cycling.
CTR, switching speed, and what they mean for the BOM
Minimum current transfer ratio of 20% at 10 mA forward current means the phototransistor collector current will be at least 2 mA when the LED is driven at 10 mA — enough to saturate a typical logic gate input or a downstream transistor stage. The 2 µs turn-on and 2 µs turn-off times suit applications switching at tens of kilohertz, such as PLC digital inputs or isolated feedback paths in power supplies. Maximum forward current of 60 mA and typical forward voltage of 1.18 V define the LED drive budget — a series resistor sized for 10-20 mA forward current keeps the LED within its safe operating area while hitting the CTR knee. Operating temperature range from -40°C to 100°C covers the industrial temperature band — suitable for outdoor telecom cabinets, factory-floor enclosures, and HVAC equipment where ambient thermal swings are the norm.
The H11A3FR2VM is marked obsolete by onsemi. Because the part is discontinued, a board respin or a functional replacement evaluation may be required for new designs. The 6-SMD Gull Wing footprint is shared by many standard optoisolators, but the CTR bin and isolation rating should be matched against alternative parts from onsemi's existing H11A family or other manufacturers.