What the isolation and data rate mean for your bus
The FOD8012A is a dual-channel logic-output optoisolator from onsemi, rated for 3750Vrms galvanic isolation and a 15Mbps data rate. That isolation level suits industrial equipment where the controller side must be protected from high-voltage transients on the field side — think motor drives, PLC digital I/O modules, or isolated sensor interfaces. The 15Mbps ceiling is fast enough for most CAN and RS-485 isolation needs; if you need 25Mbps, the single-channel FOD8001R2 is the next step up.
Push-pull output and transient immunity
The push-pull totem-pole output eliminates the need for an external pull-up resistor, saving two BOM positions per channel compared to open-collector optocouplers. Rise and fall times are both 6.5ns typical, and propagation delay is 60ns max — tight enough for timing-critical loops. The 20kV/µs common-mode transient immunity means the output won't glitch when the ground between the two sides jumps, a common failure in motor-drive and VFD applications where the field wiring is often wrong.