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Best Alternatives to FOD817ASD

Package: 4-SMD, Gull WingonsemiPhotovoltaic OutputPackage: Tape & Reel (TR); Cut Tape (CT); Digi-Reel®Number of Channels: 1Voltage - Isolation: 5000VrmsCurrent Transfer Ratio (Min): 80% @ 5mAVoltage - Output (Max): 70V

FOD817ASD is a popular single-channel phototransistor optocoupler from onsemi in a 4-SMD package, used for signal isolation in power supplies and digital systems. Several alternatives exist with similar performance.

AI replacement insight

Electrical riskmedium

CTR binning and operating temperature must be checked.

Package risklow

Many candidates share the same 4-SMD footprint.

Sourcing risklow

This is a common optocoupler type with many sources.

Can it be replaced directly?

Direct replacement for FOD817ASD should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

For a direct match, use another part from the FOD817 series like FOD817AS, but verify the temperature range. For a robust cross-vendor option, consider LTV-816S-TA1-D.

Main risk

The primary risk is substituting a part with a narrower operating temperature range or a different Current Transfer Ratio (CTR) bin.

Recommended alternatives

3
FOD817AS package
FOD817AS

onsemi

Needs validationmedium risk

Pin-compatible family member, but with a more restricted operating temperature range.

View details

Alternative comparison matrix

Feature / factorFOD817ASDFOD817ASFOD817A3SDLTV-816S-TA1-DCompatibility / risk
Package4-SMD, Gull Wing4-SMD, Gull Wing4-SMD, Gull Wing4-pin SOP4-SMD, Gull Wing / 4-pin SOP — Package matches, likely pin-compatible.; FOD817A3SD: Package matches, likely pin-compatible.; LTV-816S-TA1-D: Package is likely compatible, but footprint should be verified.
Voltage70 V70 V70 V80 V70 V / 80 V — Collector-Emitter Voltage (VCEO) matches.; FOD817A3SD: Collector-Emitter Voltage (VCEO) matches.; LTV-816S-TA1-D: Collector-Emitter Voltage (VCEO) is higher, an upgrade.
Temperature-55°C to +110°C-30 to +100 °CUnknown-50°C to +110°C-30 to +100 °C / Unknown / -50°C to +110°C — Operating temperature range is narrower.; FOD817A3SD: Operating temperature not found, must be verified from datasheet.; LTV-816S-TA1-D: Operating temperature range is very similar.
Ctr50-600%50-600%80-160%300-600%50-600% / 80-160% / 300-600% — Current Transfer Ratio (CTR) range matches.; FOD817A3SD: Tighter CTR bin is within target's range.; LTV-816S-TA1-D: Higher gain CTR bin, may require circuit adjustment.

Application & sourcing insights

Questions & answers

Verified drop-in options for FOD817ASD are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.