OR-357B-S-TP-G-(GK)
Orient
Needs validationmedium risk
Package-compatible alternative, but its very wide CTR range requires careful testing for performance consistency.
Best Alternatives to LTV-217-TP1-B-G
LTV-217-TP1-B-G is a SOP-4 phototransistor optocoupler from LITEON with 3750Vrms isolation and a 130-260% CTR. Finding a substitute requires matching the package, VCEO, and CTR bin.
AI replacement insight
Electrical riskmedium
CTR mismatch is common and requires circuit adjustment.
Package riskmedium
Some candidates have different footprints (e.g., LSOP4) requiring board changes.
Firmware risklow
Not applicable for this type of component.
Can it be replaced directly?
No verified direct drop-in replacement has been identified. All candidates require engineering review for package fit or electrical parameter differences, primarily the Current Transfer Ratio (CTR).
Best replacement path
Functional alternates like the LTV-816S series exist but have a higher CTR, requiring circuit review. For electrical match, UMW's LTV-1008 is close but requires a PCB layout change.
Main risk
The main risk is mismatch in Current Transfer Ratio (CTR), which can alter circuit gain and performance. Package footprint differences are also a key concern.
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | LTV-217-TP1-B-G | OR-357B-S-TP-G-(GK) | LTV-1008 | LTV-816S-TP-D-CU | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOP-4 | SOP-4 | LSOP4 | SMD (likely SOP-4) | SOP-4 / LSOP4 / SMD (likely SOP-4) / 4-pin SOP — Package matches target.; LTV-1008: Different package footprint requires PCB redesign.; LTV-816S-TP-D-CU: Likely compatible, but 'SMD' is generic. Datasheet suggests SOP-4.; LTV-816S-TA1-D: Likely compatible with SOP-4, but requires footprint verification. |
| Current | 130-260% | 50-600% | 130-260% | 300-600% | 50-600% / 130-260% / 300-600% — Extremely wide CTR range introduces performance variability.; LTV-1008: CTR range is an exact match.; LTV-816S-TP-D-CU: Significantly higher CTR (gain) will likely require input resistor adjustment.; LTV-816S-TA1-D: Higher CTR (gain) will likely require input resistor adjustment. |
| Voltage | 80 V | 80 V | 5000 Vrms | 80 V | 80 V / 5000 Vrms — VCEO matches target.; LTV-1008: Higher isolation voltage is a safe upgrade.; LTV-816S-TP-D-CU: VCEO matches target requirement.; LTV-816S-TA1-D: VCEO matches target requirement. |
| Temperature | -55°C to +110°C | -55°C to +125°C | - | - | -55°C to +125°C / -50°C to +110°C — Wider operating temperature range is an upgrade.; LTV-816S-TA1-D: Slightly narrower operating range on the low end. |
Application & sourcing insights
Questions & answers
The LTV-816S series from LITEON is a strong functional alternative with upgraded isolation, but features a higher CTR (300-600%) that needs circuit review. UMW's LTV-1008 is electrically similar but in a different package.