Is there a pin-compatible replacement for PC817X2NIP1B?

While several optocouplers like the UMW TLP785GB share the same DIP-4 package and pinout, no direct drop-in replacement has been confirmed. Key electrical parameters like the Current Transfer Ratio (CTR) must be carefully reviewed before substitution.

What risks should I check before replacing PC817X2NIP1B?

When replacing the PC817X2NIP1B, the main risks are electrical mismatches. Critically verify the substitute's Collector-Emitter Voltage (VCEO) is at least 80V and that its Current Transfer Ratio (CTR) performance matches your circuit's requirements, as the original part has a unique specification.

PC817X2NIP1B Alternatives, Datasheet & Cross Reference | SHARP

The SHARP PC817X2NIP1B is a 4-pin DIP general-purpose phototransistor optocoupler with 5000Vrms isolation and an 80V collector-emitter voltage. Finding a substitute requires careful matching of its unique current transfer ratio specification.

AI replacement insight

Electrical riskhigh

CTR specification is ambiguous and differs from common alternatives, requiring circuit-level validation.

Package risklow

The DIP-4 package is a common industry standard, ensuring mechanical compatibility.

Can it be replaced directly?

No direct, drop-in replacement for the PC817X2NIP1B has been identified. All candidates require engineering review, primarily due to differences in how the Current Transfer Ratio (CTR) is specified.

Best replacement path

The UMW TLP785GB series is the most promising path, but requires datasheet review of the Current Transfer Ratio (CTR) to ensure functional equivalence.

Main risk

The primary risk is a functional failure due to a mismatch in the Current Transfer Ratio (CTR), as the target part's specification is atypical.

Recommended alternatives

A potential functional alternative with matching package and voltage ratings, but its CTR requires engineering review.

View details

Alternative comparison matrix

Feature / factor	PC817X2NIP1B	TLP785GB(UMW)	TLP785GB-S(UMW)	Compatibility / risk
Package	DIP-4	DIP-4	DIP-4	DIP-4 — Same package and pin count.; TLP785GB-S(UMW): Same package and pin count.
Voltage	80 V	80 V	5000 Vrms	80 V / 5000 Vrms — Collector-Emitter Voltage (VCEO) matches.; TLP785GB-S(UMW): Isolation voltage matches.
Current	6.5 to 13.0 mA	100% - 600%	100% - 600%	100% - 600% — CTR is specified differently (percentage vs. mA range). Requires circuit analysis.; TLP785GB-S(UMW): CTR is specified differently (percentage vs. mA range). Requires circuit analysis.
Temperature	-30 to +100 °C	-55°C to 110°C	-55°C to 110°C	-55°C to 110°C — Candidate has a wider operating temperature range.; TLP785GB-S(UMW): Candidate has a wider operating temperature range.

Application & sourcing insights

Questions & answers

UMW's TLP785GB series is a potential functional alternative, offering the same package, isolation, and collector voltage. However, its Current Transfer Ratio (CTR) is specified differently and requires engineering verification for your application.