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onsemi FOD817D300W — Optoisolators

FOD817D300W Optoisolator 5000Vrms Transistor Output 4-DIP

MPNFOD817D300W
Active

onsemi FOD817D300W, single-channel optoisolator, DC input, transistor output, 5000Vrms isolation, 4-DIP through-hole package, 300%–600% CTR at 5mA, -55°C to 110°C operating range.

$0.5200Ref. price · indicative, final on quote
onsemi FOD817D300W datasheet (PDF)
Packaging4-DIP (0.400", 10.16mm)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

FOD817D300W specifications
ParameterValue
Input typeDC
Output typeTransistor
MountingThrough Hole
Voltage - isolation5000Vrms
Voltage - output70V
Voltage - forward (Vf)1.2V
Current - output (Channel)50mA
Current transfer ratio600% @ 5mA
Current - DC forward (If)50 mA
Operating temperature-55°C ~ 110°C
PackageTube
Case4-DIP (0.400\", 10.16mm)
Channels1
Vce saturation200mV
Rise (Fall time)4µs, 3µs

Product details

5000Vrms isolation for safety-critical isolation

The FOD817D300W is a single-channel optoisolator from onsemi in a 4-DIP through-hole package. It provides 5000Vrms galvanic isolation between a DC input LED and a phototransistor output, rated for continuous operation from -55°C to 110°C. The 300%–600% current transfer ratio at 5mA forward current gives ample margin to drive a microcontroller GPIO or logic gate input across temperature and LED degradation — a common failure point in marginal designs.

CTR range and switching speed for BOM margin

With a minimum CTR of 300% at 5mA, this part can sink the full 50mA output channel current with only 1.2V forward drop — the 200mV Vce saturation keeps the output transistor in hard saturation, minimising power dissipation in the load resistor.

ROHS3 compliance is confirmed.

Package and mounting for through-hole assembly

The 4-DIP package with 0.400-inch (10.16mm) lead spacing is a standard through-hole footprint, compatible with wave-solder or hand-solder assembly. The 70V output rating and 50mA continuous output current suit low-side switching of relays, solenoids, or DC loads up to 3.5W.

Frequently asked questions

Can I replace FOD817A with FOD817D300W?

Yes, FOD817A and FOD817D300W share the same pinout, package (4-DIP), isolation voltage (5000Vrms), and output ratings (70V, 50mA). The difference is the CTR bin: FOD817A is a lower-CTR grade (80–160% at 5mA), while FOD817D300W is a higher-CTR grade (300–600% at 5mA). If your circuit needs the higher CTR margin, the D300W is a drop-in replacement. Confirm the CTR requirement in your design before swapping.