OR-357B-S-TP-G
Orient
Needs validationlow risk
A strong alternative from the same manufacturer and series, with a lower CTR grade (Rank B vs C).
Best Alternatives to OR-3H7C-TP-G
Find and compare substitutes for the OR-3H7C-TP-G, a SOP-4 transistor output optocoupler. Review alternatives and equivalents, with analysis of key parameters like CTR and VCEO.
AI replacement insight
Electrical riskmedium
CTR differences are common and require analysis.
Package risklow
SOP-4 is a standard package.
Sourcing risklow
Multiple vendors produce similar optocouplers.
Can it be replaced directly?
No drop-in replacement is confirmed without engineering review. The OR-357B-S-TP-G is the closest option but has a different Current Transfer Ratio (CTR) bin.
Best replacement path
Use a different CTR grade from the same family, like OR-357B-S-TP-G, after verifying circuit tolerance for the lower gain.
Main risk
Mismatched Current Transfer Ratio (CTR) is the primary risk, potentially requiring circuit adjustments.
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | OR-3H7C-TP-G | OR-357B-S-TP-G | TLP185GB-S(UMW) | TLP181GB-S(UMW) | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOP-4 | SOP-4 | - | - | SOP-4 — Package matches. |
| Voltage | 80 V | 3750 Vrms | - | - | 80 V — Collector-Emitter Voltage (VCEO) matches. |
| Current | 200% - 400% | 130% - 260% | - | - | 50% - 600% — CTR minimum is much lower (50% vs 200%). |
| Temperature | -30°C to 110°C | -55°C to 125°C | - | - | -55°C to 110°C — Operating temperature range is wider. |
| Power | 200 mW | - | - | 150 mW | — |
Application & sourcing insights
Questions & answers
The OR-357B-S-TP-G from the same manufacturer is a strong candidate, offering identical package and voltage ratings but with a slightly lower Current Transfer Ratio (CTR) range (130-260%). Always verify if this CTR is suitable for your application.