Is there a pin-compatible replacement for LTV-356T?

The Vishay VOM618A series appears to be pin-compatible, as it uses the same mini-flat package style. However, it is not a guaranteed drop-in replacement because its Current Transfer Ratio (CTR) is specified in a narrower range and at a different test current, which may affect circuit performance.

What risks should I check before replacing LTV-356T?

Before replacing LTV-356T, you must verify three key things: 1) The package is a 'mini-flat' or 'half-pitch' SOP-4, not a standard SOP-4. 2) The Collector-Emitter Voltage (VCEO) is at least 80V. 3) The candidate's Current Transfer Ratio (CTR) range is suitable for your circuit's gain requirements.

LTV-356T Alternatives, Datasheet & Cross Reference | LITEON

LTV-356T is a compact, 4-pin mini-flat phototransistor optocoupler from LITEON with 80V VCEO and 3750Vrms isolation. Finding a replacement requires matching the half-pitch package and key electrical ratings.

AI replacement insight

Package riskhigh

Many common optocouplers use a standard-pitch package that is not physically compatible.

Electrical riskmedium

Candidates may have lower voltage ratings (VCEO) or different Current Transfer Ratio (CTR) bins.

Can it be replaced directly?

No drop-in replacement is confirmed without engineering review. The Vishay VOM618A series is a strong candidate for form, fit, and function, but the Current Transfer Ratio (CTR) must be verified for the specific application.

Best replacement path

The Vishay VOM618A series is the strongest replacement path, matching the critical mini-flat package and voltage ratings.

Main risk

The primary risk is selecting a part with an incompatible package (e.g., standard SOP instead of mini-flat) or a lower Collector-Emitter Voltage (VCEO).

Recommended alternatives

Form-fit alternative with a lower voltage rating (70V VCEO) that presents a downgrade risk.

View details

Alternative comparison matrix

Feature / factor	LTV-356T	VOM618A-5X001T	VOM618A-7X001T	LTV-217-B-G	Compatibility / risk
Package	4-SOP (Mini-flat)	4-SMD, Gull Wing (Mini-flat)	4-SMD, Gull Wing (Mini-flat)	4-SOP (Half Pitch)	4-SMD, Gull Wing (Mini-flat) / 4-SOP (Half Pitch) — Package is form-fit compatible (1.27mm pitch).; VOM618A-7X001T: Package is form-fit compatible (1.27mm pitch).; LTV-217-B-G: Package is form-fit compatible (half-pitch).
Voltage	80 V	80 V	3750 Vrms	3750 Vrms	80 V / 3750 Vrms — Collector-Emitter Voltage (VCEO) matches.; VOM618A-7X001T: Isolation voltage matches.; LTV-217-B-G: Isolation voltage matches.
Current	50% - 600%	50% - 100% @ 1mA	80% - 160% @ 1mA	130% - 260%	50% - 100% @ 1mA / 80% - 160% @ 1mA / 130% - 260% — CTR bin is narrower and tested at different current.; VOM618A-7X001T: CTR bin is narrower and tested at different current.; LTV-217-B-G: CTR bin is a subset of the target's range.
Temperature	-55°C to +110°C	-	-55°C to +110°C	-55°C to +110°C	-55°C to +110°C — Operating temperature range matches.; LTV-217-B-G: Operating temperature range matches.

Application & sourcing insights

Questions & answers

The best alternatives for the LTV-356T are in the Vishay VOM618A series, such as VOM618A-7X001T. They match the mini-flat package, 80V VCEO, and temperature range, but require verification of the Current Transfer Ratio (CTR).