Is there a pin-compatible replacement for PC817X2CSP9F?

Yes, other optocouplers in the SHARP PC817 series, like PC817X1 and PC817X3, share the same 4-pin DIP package and pinout. However, their electrical characteristics, specifically the Current Transfer Ratio (CTR), are different.

What risks should I check before replacing PC817X2CSP9F?

The main risk is the difference in Current Transfer Ratio (CTR). A lower CTR may result in a weak or lost signal, while a higher CTR could cause output saturation. Always verify the replacement in your specific application.

PC817X2CSP9F Alternatives, Datasheet & Cross Reference | SHARP

PC817X2CSP9F is a popular general-purpose optocoupler. While no exact drop-in is confirmed, several pin-compatible alternatives from the same PC817 family exist with different gain (CTR) characteristics.

AI replacement insight

Electrical riskmedium

Different CTR requires circuit validation.

Package risklow

Pin-compatible alternatives are available.

Can it be replaced directly?

No exact drop-in replacement is confirmed. However, other parts in the SHARP PC817 family are pin-compatible but have different Current Transfer Ratios (CTR) that must be verified for your application.

Best replacement path

Use other SHARP PC817 series parts with different CTR ranks, like PC817X1 or PC817X3, after verifying circuit tolerance.

Main risk

The primary risk is a mismatch in Current Transfer Ratio (CTR), which can affect signal integrity, timing, or power consumption.

Recommended alternatives

Pin-compatible alternative from the same family but with a lower CTR (gain). Requires engineering review.

View details

Alternative comparison matrix

Feature / factor	PC817X2CSP9F	PC817X1CSP9F	PC817X3NIPW	PC817X3NSZ2B	Compatibility / risk
Package	4-pin DIP	4-Pin DIP	-	-	4-pin DIP — Package is physically compatible.
Voltage	80 V	80 V	-	-	80 V — Collector-Emitter Voltage (VCEO) matches.
Current	6.5% to 13%	4.0% to 8.0%	-	-	Rank C (13-27% est.) — CTR is higher. Circuit must tolerate higher gain to avoid saturation.
Temperature	-30 to +100 °C	-30°C to +100°C	-	-	-30 to +100 °C — Operating temperature range matches.

Application & sourcing insights

Questions & answers

The best alternatives are typically other members of the SHARP PC817 family, such as PC817X1CSP9F (lower CTR) or PC817X3NIPW (higher CTR). The choice depends on whether your circuit can tolerate a different gain.