The H11A817AW: It comes in a 4-DIP through-hole package (0.400-inch lead spacing) supplied in a tube. Rated for 5300Vrms isolation, it provides galvanic separation between input and output circuits — enough for mains-referenced signal isolation in industrial controls, power supplies, and PLC I/O modules. Current transfer ratio (CTR) is specified at 80% minimum and 160% maximum when the LED is driven at 5 mA forward current — this band ensures consistent logic-level switching across temperature and aging without overdriving the output transistor.
For existing BOM lines, this part is sourced through independent distribution channels. No pin-compatible direct replacement is documented by onsemi, so a board-level qualification may be needed for a substitute.
Electrical and environmental ratings
Typical rise and fall times are 2.4 µs each, placing the usable switching frequency in the low-kHz range — adequate for status feedback, relay drivers, and isolated serial communication at 9600 baud or similar. Operating temperature spans -55°C to 100°C, covering industrial and outdoor telecom environments. The forward LED voltage is 1.2 V typical, and maximum forward current is 50 mA.