Is there a pin-compatible replacement for PC817X1CSP9F?

While several parts like the PC817X2CSP9F share the same 4-pin DIP package and pinout, no exact replacement with the same 4-8% CTR is listed. All pin-compatible options require review due to different CTR values.

What risks should I check before replacing PC817X1CSP9F?

The main risk is the Current Transfer Ratio (CTR). The target has a low CTR (4-8%). Using a replacement with a higher CTR can alter circuit behavior, potentially causing signal saturation or timing issues. Always verify the replacement's CTR against your application's requirements.

PC817X1CSP9F Alternatives, Datasheet & Cross Reference | SHARP

PC817X1CSP9F is a general-purpose 4-pin DIP optocoupler from SHARP with a 4-8% Current Transfer Ratio (CTR). When seeking alternatives, verifying the CTR is critical for circuit compatibility.

AI replacement insight

Electrical riskhigh

CTR mismatch can cause signal saturation or failure to switch, requiring redesign.

Package risklow

Many alternatives share the same 4-pin DIP package and pinout.

Can it be replaced directly?

No direct, drop-in replacement is identified. All candidates require engineering review, primarily due to differences in the Current Transfer Ratio (CTR).

Best replacement path

The best path is to select another SHARP PC817-series part with the closest possible CTR, such as PC817X2CSP9F, and verify its impact on the circuit.

Main risk

The primary risk is functional failure due to a mismatch in the Current Transfer Ratio (CTR), which defines the optocoupler's gain and affects circuit behavior.

Recommended alternatives

Strongest alternative from the same SHARP PC817 series with identical package and ratings, but a slightly higher CTR.

View details

Alternative comparison matrix

Feature / factor	PC817X1CSP9F	PC817X2CSP9F	PC817X2YIPW	Compatibility / risk
Package	4-Pin DIP	4-pin DIP	4-Pin DIP	4-pin DIP / 4-Pin DIP — Package matches.; PC817X2YIPW: Package matches.
Voltage	80 V	80 V	80 V	80 V — Collector-Emitter Voltage (VCEO) matches.; PC817X2YIPW: VCEO matches.
Ctr	4.0% to 8.0%	6.5% to 13%	130% to 260%	6.5% to 13% / 130% to 260% — Candidate has a slightly higher CTR (Rank X2).; PC817X2YIPW: Candidate has a significantly higher CTR (Rank Y).
Temperature	-30°C to +100°C	-30 to +100 °C	-30 to +100 °C	-30 to +100 °C — Operating temperature range matches.; PC817X2YIPW: Operating range matches.

Application & sourcing insights

Questions & answers

PC817X2CSP9F is a strong alternative from the same SHARP series. It has a slightly higher Current Transfer Ratio (CTR), so circuit review is recommended. Other PC817 variants have significantly different CTRs and require redesign.