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onsemi FOD817A3SD — Optoisolators

FOD817A3SD onsemi Optoisolator 5000Vrms Transistor Output

MPNFOD817A3SD
Active

onsemi FOD817A3SD, single-channel DC-input transistor-output optoisolator, 5000Vrms isolation, 80%–160% CTR at 5mA, 4-SMD Gull Wing surface-mount package, -55°C to 110°C operating range.

$0.6000Ref. price · indicative, final on quote
Packaging4-SMD, Gull Wing
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

FOD817A3SD specifications
ParameterValue
Input typeDC
Output typeTransistor
MountingSurface Mount
Voltage - isolation5000Vrms
Voltage - output70V
Voltage - forward (Vf)1.2V
Current - output (Channel)50mA
Current transfer ratio160% @ 5mA
Current - DC forward (If)50 mA
Operating temperature-55°C ~ 110°C
PackageTape & Reel (TR) Cut Tape (CT)
Case4-SMD, Gull Wing
Channels1
Vce saturation200mV
Rise (Fall time)4µs, 3µs

Product details

5000Vrms isolation — the safety barrier your BOM needs

CTR bin A: 80%–160% at 5 mA — no guesswork on drive margin

Current transfer ratio is binned: minimum 80%, maximum 160%, both specified at If = 5 mA. That spread gives the designer a predictable output current range without over-specifying the LED drive — the 200 mV Vce(sat) ceiling keeps the transistor in hard saturation across the CTR window. Rise and fall times are 4 µs and 3 µs typical, adequate for 10–20 kHz switching or digital signal isolation at moderate data rates.

Lifecycle status is Active per onsemi. Operating temperature from -55°C to 110°C covers industrial and outdoor applications where commercial-grade optos would drift or latch.

Frequently asked questions

Is FOD817A3SD compatible with PC817?

Functionally yes — both are single-channel DC-input transistor-output optoisolators in a 4-pin DIP/SMD footprint. The FOD817A3SD offers a wider temperature range (-55°C to 110°C vs PC817's typical 0°C to 70°C) and a tighter CTR bin. Pinout is the standard 4-pin DIP layout; confirm your PCB footprint matches the Gull Wing package before drop-in.