The onsemi HMHAA280R2V is a single-channel optoisolator with a phototransistor output, housed in a 4-Mini-Flat surface-mount package (4-SOIC, 0.173" width, 4.40mm body). It accepts both AC and DC input drive, making it suitable for coupling signals from either polarity or line-voltage sensing circuits. Rated for 3750Vrms isolation, this part provides a basic safety barrier between input and output sides — typical for applications where galvanic separation is needed between a low-voltage controller and a higher-voltage load or sensor interface. With a typical rise and fall time of 3µs each, it handles moderate-speed switching up to roughly 100 kHz before propagation delay becomes a limiting factor.
Temperature grade and operating envelope
Operating from -55°C to 100°C, the HMHAA280R2V covers the full industrial temperature range. The output transistor can sink up to 50mA continuous and withstand up to 80V across the collector-emitter path, with a saturation voltage of 400mV max at rated current. Maximum forward current is 50mA, with a typical forward voltage of 1.4V. The 4-Mini-Flat package keeps the board footprint small — about 4.4mm × 5.0mm — and the surface-mount profile suits high-volume pick-and-place assembly.