The H11A43S: Sourcing this part now runs through independent distribution — quantities are lot-specific and confirmed at RFQ.
Isolation barrier and signal transfer
Rated for 5300 Vrms isolation between input and output — this is the test voltage for basic isolation per IEC 60747-5-5, sufficient for mains-referenced control circuits in industrial power supplies and motor drives where galvanic separation protects the low-voltage side. Minimum current transfer ratio of 10 % at 10 mA forward current means the output transistor saturates with 1 mA base drive — typical turn-on and turn-off times are 2 µs each, so this part handles signalling up to about 250 kHz before propagation delay starts to limit pulse width integrity.
Output ratings and temperature range
Operating temperature spans -55 °C to 100 °C, covering the full industrial and automotive ambient range — the CTR degrades at both extremes, so a design at 85 °C should budget a 20–30 % reduction in minimum CTR from the 25 °C datasheet value.
Supplied in a 6-SMD gull wing package (6-SMD), surface-mount only. The gull wing leads provide a visible solder fillet for AOI inspection and moderate standoff for cleaning under the body. The base pin is brought out on pin 6 — this allows the designer to bias the base for faster switching or to connect a base-emitter resistor for noise immunity, a feature not available on the three-pin phototransistor variants in the same family.