The Vishay ILD615-4X009T is a dual-channel optocoupler with a transistor output, delivering 5300Vrms of galvanic isolation between input and output. That isolation rating suits it for safety-barrier applications in industrial motor drives, power supplies, and PLC I/O modules where you need to separate high-voltage domains from low-voltage control logic.
The current transfer ratio is specified at 160% minimum and 320% maximum, both measured at 10mA forward current. The 70V output maximum and 50mA per-channel current rating give you room for 24V industrial logic levels or low-power loads.
Rise and fall times are both 2µs typical, and turn-on/turn-off times run 3µs and 2.3µs respectively. That puts this part in the medium-speed optocoupler class — fine for 10–100 kbps data isolation or 50/60 Hz AC zero-cross detection, but not for high-speed serial buses like CAN or SPI. If your application needs faster edge rates, you'd be looking at a logic-output optocoupler instead. The DC input type means it's designed for steady-state or low-frequency switching, not pulse trains.
Package and mounting details
The ILD615-4X009T comes in an 8-SMD package with gull-wing leads, surface-mount only. The leads are standard gull-wing — no exposed pad, no thermal vias needed for this power level (50mA per channel). Standard reflow profiles for MSL 1 or 3 apply; check the reel label for the specific moisture sensitivity level.
No AEC-Q automotive qualification is listed, so it's best treated as an industrial/commercial grade device. For new designs, it's a safe choice with no imminent obsolescence risk.