The FOD2741CSD: It provides 5000Vrms of galvanic isolation between input and output, which is the primary parameter for safety isolation in power supply feedback or signal isolation applications. The current transfer ratio (CTR) is specified at 100% minimum and 200% maximum, tested at a forward current of 10 mA. This CTR range defines the gain margin for the optocoupler in a given circuit — a tight 100-200% band means the designer can count on consistent drive strength across the production lot without over-designing the sense resistor or pull-up. Output ratings include a maximum collector-emitter voltage of 30V and a continuous output current of 50 mA per channel. The Vce saturation is 400 mV maximum, which sets the voltage drop across the output transistor when fully on — relevant for low-side switching where the residual voltage subtracts from the load supply.
Package and temperature grade
The 8-SMD gull wing package (supplier device package 8-SMD) is a surface-mount footprint suited for automated assembly. The Tape & Reel (TR) packaging option is intended for high-volume pick-and-place lines — not for hand-prototyping without a carrier. This temperature grade is typical for general-purpose optoisolators used in AC-DC converters, PLC input modules, and motor drive feedback paths that do not require extended automotive or military temperature ranges.
The FOD2741CSD is classified as Obsolete by onsemi. This means the manufacturer has discontinued production and there is no scheduled last-time buy window remaining. For existing BOM lines that specify this exact ordering code, procurement must source through independent distribution channels — available surplus or new-old-stock inventory, confirmed at RFQ. The base product number FOD274 may share a common die and pinout with other package variants, but no pin-compatible drop-in replacement is documented on the official record.