PC817B
GOODWORK
Needs validationmedium risk
PC817B is a same-function SMD-4 optocoupler, but its CTR grade is lower than PC817C.
Best Alternatives to PC817C
PC817C replacements must preserve SMD-4 fit, optocoupler pinout, isolation rating, and CTR grade. The provided evidence supports only cautious review, not a verified drop-in.
AI replacement insight
Electrical riskmedium
PC817B CTR is lower than PC817C.
Package riskmedium
SMD-4 is listed, but drawing not checked.
Firmware risklow
No digital interface involved.
Sourcing risklow
PC817B is active and indexed.
Can it be replaced directly?
Direct replacement for PC817C should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.
Best replacement path
Review PC817B only if lower CTR is acceptable and pinout is confirmed.
Main risk
CTR downgrade and unverified pinout.
Recommended alternatives
1Alternative comparison matrix
| Feature / factor | PC817C | PC817B | Alt 2 | Alt 3 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SMD-4 | SMD-4 | SMD-4 — ES package match | ||
| Pinout | 4-pin opto | 4-pin opto | 4-pin opto — pin functions not shown | ||
| Voltage | 5000Vrms,70V VCEO | 5000Vrms,80V VCEO | 5000Vrms,80V VCEO — VCEO higher; iso equal | ||
| Current | IF/IC 50mA | IF/IC 50mA | IF/IC 50mA — ES values match | ||
| Temperature | -55 to +110C | -55 to +110C | -55 to +110C — ES values match |
Application & sourcing insights
Questions & answers
Verified drop-in options for PC817C 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.