5300Vrms isolation in a through-hole DIP
The onsemi H11A617BW is a single-channel optoisolator in a 4-DIP through-hole package, providing 5300Vrms of galvanic isolation between a DC input LED and a phototransistor output. This isolation rating suits it for breaking ground loops and protecting low-voltage logic from high-side transients in industrial control and power supply feedback paths.
Current transfer ratio and switching speed
The CTR is specified at 63% minimum and 125% maximum at a forward current of 10mA — a relatively tight bin that guarantees consistent drive capability for a given LED current. The 2.4µs typical rise and fall times (2.4µs each) mean the part switches at moderate speeds, adequate for 50/60 Hz line synchronisation or low-frequency digital isolation but not for high-speed data links.
Temperature range and output ratings
Operating from -55°C to 100°C, the H11A617BW covers industrial and some military temperature environments. The output transistor is rated for 70V maximum and 50mA continuous current, with a Vce(saturation) of 400mV max — the saturation voltage matters when driving a logic input or relay coil at low supply rails, as the voltage drop subtracts from the available load voltage.