3750Vrms isolation and 100%–1200% CTR at 1 mA forward
The FODM124R2V: Rated for 3750Vrms isolation in a 4-SMD gull-wing package — this is the safety barrier spec for mains-referenced circuits like relay drivers, PLC digital inputs, and motor-drive feedback. The 100% minimum CTR at 1 mA forward current means the output transistor can saturate with as little as 1 mA LED drive, suiting low-power logic interfaces. The maximum CTR of 1200% warns of wide gain spread; the design must tolerate the full range without saturating the output stage.
80 V / 80 mA output – drives relays and logic gates directly
Output transistor rated for 80 V maximum and 80 mA continuous current — enough to switch a relay coil or a logic input without a buffer transistor. The 400 mV max Vce saturation at rated current keeps conduction loss low, important for thermal budget in dense PCB layouts.
3 µs rise/fall – fits 100 kHz switching applications
The 1.3 V max forward voltage and 50 mA max forward current define the LED drive budget — a series resistor from a rail can set the 1 mA operating point.