5000 Vrms isolation with 10 kV/µs transient immunity
The FOD4216SV is a single-channel triac-output optoisolator from onsemi, rated for 5000 Vrms isolation — sufficient for reinforced insulation in mains-voltage equipment. Its 10 kV/µs minimum static dV/dt ensures the output triac does not false-fire on fast line transients from motor starters or inductive load switching. The 600 V off-state voltage block allows direct switching of 240 VAC or 277 VAC loads without an external snubber in many designs, though the 500 µA hold current sets the minimum load current to keep the triac latched.
Certified barrier for mains-referenced designs
The isolation barrier carries cUL, FIMKO, UL, and VDE approvals — a four-agency certification set that covers North American and European safety standards. This eliminates the need for separate safety-agency review of the optoisolator in the final product. The 1.28 V typical forward voltage and 1.3 mA maximum LED trigger current mean the LED can be driven directly from a 3.3 V or 5 V logic output through a series resistor, keeping the BOM count low.