Active optoisolator for isolated feedback and signal transfer
The onsemi FOD2742BR2V is a single-channel optoisolator in an 8-SOIC surface-mount package, rated for 2500Vrms isolation between input and output. It accepts a DC input and drives a transistor output, making it a straightforward choice for isolated feedback loops in switch-mode power supplies, PLC digital input modules, and general-purpose signal isolation where you need a clean galvanic barrier without a lot of external circuitry.
CTR range sets the LED drive budget
The current transfer ratio is specified at 100% minimum and 200% maximum, both measured at a forward current of 10 mA. That 2:1 spread means the design must tolerate the full CTR range without saturating the output transistor or dropping out at the low end. The output transistor can sink up to 50 mA continuously and saturates at 400 mV max, which is tight but workable for driving a downstream logic input or an optocoupler-load resistor.
Active production, surface-mount reel ready
This part carries an Active product status and is ROHS3 compliant. It ships in Tape & Reel or Cut Tape formats, which suits both prototype builds and production reflow. The 8-SOIC footprint is a standard 3.90 mm body width — no exotic land pattern needed. Sourced per RFQ against your BOM quantity; no stock-holding claim, but the active status means supply continuity is not a concern.