What the 5300 Vrms isolation means on the bench
The H11A5W provides 5300 Vrms galvanic isolation between the DC input LED and the phototransistor output — enough to separate control logic from a 480 VAC motor drive or a medical patient-contact circuit, with margin for repetitive surge testing per IEC 60950-1 reinforced insulation requirements. With a minimum current transfer ratio of 30% at 10 mA forward current, the output transistor saturates reliably at 400 mV max Vce — the 2 µs typical turn-on and turn-off times keep up with 250 kHz switching without pulse-width distortion.
Obsolete — what that means for your BOM line
The part is a standard 6-DIP through-hole package (0.400-inch body width, 10.16 mm lead spacing), which mates with existing socket or wave-solder footprints — no board layout change needed if you find stock.
Temperature range and field deployment
Rated for -55°C to 100°C operating ambient — this covers industrial enclosures, outdoor telecom cabinets, and under-hood automotive auxiliary circuits without derating. The 30 V max output voltage suits 24 VDC PLC input modules and 12 V logic rails. The DC input accepts up to 100 mA forward current — the 1.18 V typical forward drop means a 5 V logic rail needs a series resistor around 390 ohms to hit the 10 mA test condition for the CTR spec.