
LITEON
Same family from LITEON with a wider CTR range (50-600%) that fully includes the target's 200-400% range.
LTV-356T-C is a popular 4-SOP optocoupler with an 80V VCEO and a 200-400% CTR. Alternatives exist but require careful review of the Current Transfer Ratio (CTR) and Collector-Emitter Voltage (VCEO).
Current Transfer Ratio (CTR) variation is the main concern and requires validation.
Several alternatives exist in the same 4-SOP package family.
No guaranteed drop-in replacement was found. The closest is LTV-356T, which has a wider CTR range and requires testing.
Use LTV-356T, the base part from the same manufacturer, and verify circuit gain.
Electrical mismatch, primarily the Current Transfer Ratio (CTR), which can affect signal integrity and loop stability.

LITEON
Same family from LITEON with a wider CTR range (50-600%) that fully includes the target's 200-400% range.
| Feature / factor | LTV-356T-C | LTV-356T | VOMA617A-8X001T | Alt 3 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | 4-SOP (Mini-flat) | 4-SOP (Mini-flat) | 4-SOP | 4-SOP (Mini-flat) — Package matches target.; VOMA617A-8X001T: Package appears compatible. | |
| Voltage | 80 V | 80 V | 3750 VRMS | 80 V / 3750 VRMS — VCEO matches.; VOMA617A-8X001T: Isolation voltage matches. | |
| Ctr | 200% - 400% | 50% - 600% | 130% - 260% | 50% - 600% / 130% - 260% — Wider CTR range fully contains target's range.; VOMA617A-8X001T: CTR range is lower and only partially overlaps. | |
| Temperature | -55°C to +110°C | -55°C to +110°C | -40°C to +110°C | -55°C to +110°C / -40°C to +110°C — Operating temperature range matches.; VOMA617A-8X001T: Lower operating temperature limit is higher. |
The base part, LTV-356T from LITEON, is a strong functional alternative as it has the same key ratings but a wider CTR range that includes the target's specification.