The HMHAA280R2 is a single-channel optocoupler from onsemi, providing 3750Vrms of galvanic isolation between an AC or DC input LED and a phototransistor output. Its current transfer ratio spans 50% to 600% at a forward current of 5mA, covering a wide range of logic-level or low-current signal isolation needs. The device operates across -55°C to 100°C, suiting it for industrial and telecom environments where temperature extremes are routine.
Switching and output characteristics
Rise and fall times are both 3µs typical, enabling signal isolation up to roughly 160 kHz data rates before the output waveform degrades. The phototransistor can sink up to 50mA continuous output current with a maximum Vce saturation of 400mV at the rated forward current — adequate for driving downstream logic inputs or low-power relays. Maximum output voltage across the transistor is 80V, and the LED forward voltage is 1.4V maximum at 50mA forward current.
Package, mounting, and compliance
Housed in a 4-SOIC (0.173", 4.40mm width) surface-mount package, the HMHAA280R2 is also designated as supplier device package 4-Mini-Flat.