5000Vrms isolation and CTR window for BOM fit
The FOD817AS provides 5000Vrms galvanic isolation between a DC input and a transistor output — sufficient for reinforced insulation in mains-referenced control circuits per IEC 60950-1 reinforced grade. Current transfer ratio is specified as a min/max window of 80% to 160% at If=5mA, not a single typical value — the 2:1 spread means the designer must budget for the low end in the load resistor calculation and the high end for saturation margin. Output transistor handles up to 70V collector-emitter and 50mA continuous, with a 200mV Vce(sat) max at rated current — this drives standard 5V or 24V logic inputs directly without a buffer stage.
Switching speed and temperature range for industrial duty
Typical rise and fall times of 4µs and 3µs respectively limit the useful data rate to roughly 100 kbps — adequate for 50/60 Hz zero-cross detection, PLC input isolation, or status feedback, but not for high-speed serial links. Operating temperature spans -55°C to 110°C, covering the full industrial range and reaching into automotive under-hood ambient where the junction temperature stays below the 150°C abs-max typical for this class. The 1.2V typical forward voltage at 5mA input current aligns with standard 3.3V or 5V logic outputs — the series resistor calculation uses Vf=1.2V as the drop across the LED, leaving the remainder across the current-limiting resistor.
Active lifecycle and compliance status
Sourced through independent distribution channels; availability and current pricing confirmed against an RFQ for the specific BOM quantity.