Dual Darlington optocoupler in 8-SOIC
The FOD073LR2 is a dual-channel Darlington-output optocoupler from onsemi in a standard 8-SOIC package (0.154", 3.90 mm width). It accepts DC input and delivers up to 60 mA per channel at a maximum output voltage of 7 V. The current transfer ratio spans 400% minimum to 7000% maximum, both measured at 500 µA forward current — the Darlington gain stage gives you a wide operating margin for driving logic inputs or low-current relays. Isolation is rated at 2500 Vrms, suitable for basic functional isolation in industrial control, motor drives, and isolated power-supply feedback loops.
Switching speed and drive current
Typical turn-on time is 5 µs and turn-off time is 25 µs — the slower turn-off is characteristic of the Darlington output stage and limits the part to switching applications below about 20 kHz. Maximum DC forward current is 20 mA, with a typical forward voltage of 1.35 V. The output side can sink 60 mA per channel, enough to drive a small relay coil or a PLC input module directly.
Active lifecycle and ordering
Operating temperature range is -40°C to 85°C, covering most industrial and commercial environments. The surface-mount 8-SOIC footprint is widely used and easy to place with standard pick-and-place equipment.