Dual-channel optocoupler for isolated signal transfer
The Vishay ILD621-X007T is a dual-channel phototransistor-output optocoupler in an 8-SMD gull-wing package. It provides 5300Vrms of galvanic isolation between input and output, making it suitable for breaking ground loops and protecting low-voltage logic from high-side transients in industrial controls, motor drives, and isolated power supplies. The two independent channels share a common LED-side input and separate phototransistor outputs, so one package handles two isolated signal paths.
The current transfer ratio spans 50% minimum to 600% maximum, both specified at 5 mA forward current. A 50% floor means the output transistor can sink at least 2.5 mA with 5 mA LED drive, which is enough to pull a logic input low through a typical 10 kΩ pull-up to 5 V. The 600% ceiling gives headroom if the LED current is reduced for low-power designs or if the CTR degrades over temperature and lifetime. At the 60 mA absolute-max forward current the LED is driven hard, but the CTR is not guaranteed there — stay near the 5 mA test point for predictable performance.
Switching speed and output ratings
Rise and fall times are both 2 µs typical; turn-on time is 3 µs, turn-off 2.3 µs. That puts the usable switching frequency around 100 kHz or so for digital signals — fine for 50/60 Hz mains zero-cross detection, relay drivers, or status feedback at a few tens of kHz, but not for high-speed data links. The output transistor is rated for 70 V collector-emitter and 50 mA continuous per channel, with a saturation voltage of 400 mV max at that current. That 70 V ceiling lets it interface directly with 24 V or 48 V industrial logic rails without a level shifter.
Temperature range and rework considerations
No lead-time or allocation flags are attached to this part at the moment; it is a standard catalog optocoupler that moves through distribution without special handling.