7500Vpk isolation in a 6-SMD gull-wing package
The onsemi H11A4SR2VM is a single-channel optoisolator with a transistor-with-base output, rated for 7500Vpk isolation — a figure that suits industrial and medical applications where reinforced isolation is required between the low-voltage control side and the high-voltage field side. Packaged in a 6-SMD gull-wing (6-SMD, Gull Wing) and supplied on tape and reel, it is designed for surface-mount assembly on boards that need to separate noisy or hazardous circuits from sensitive logic.
CTR and switching speed — what they mean for the BOM
The minimum current transfer ratio (CTR) is 10% at 10 mA forward current — this sets the minimum output current the phototransistor can sink for a given LED drive, so the downstream logic input must be able to trigger on that level. A 10% CTR at 10 mA If means the output can pull at least 1 mA, which is enough to drive a TTL or CMOS gate with a pull-up resistor. Typical turn-on and turn-off times are both 2 µs, giving a combined switching delay of about 4 µs. For a 100 kHz data rate the period is 10 µs, so the 4 µs delay uses 40% of the bit period — marginal for reliable communication without a faster optocoupler. The forward voltage (Vf) is 1.18 V typical, and the maximum DC forward current is 60 mA — the LED drive resistor should be sized to keep If below 60 mA at the worst-case Vf and supply voltage.
Quantities are lot-specific and confirmed at RFQ; no stock-holding claim is made here.