Vishay VOS618A-4T Mini-Flat Optocoupler for Reliable Low-Current Signal Transfer

• Compact High-Performance Isolation Device: Delivers full isolation performance in a minimal footprint.
• Low Input Drive Requirement: Compatible with designs where LED drive current is constrained.
• Robust Voltage Ratings: With 80 V VCEO and 3750 VRMS isolation, it withstands demanding electrical environments.

The Vishay VOS618A-4T is listed in the same datasheet family of the VOS618A series (SSOP-4, half-pitch, GaAs IR emitter + silicon phototransistor detector). While the datasheet does not explicitly list a “-4” bin in the primary bin table, it may correspond to a specific CTR sub-bin or custom ordering option. 
For consistency with the series, it offers the same core product architecture: high isolation, low input current operation, and compact form factor.

Features

• High CTR at low input current (consistent with series performance).

• Low profile SSOP-4 half-pitch package.

• 80 V collector-emitter voltage rating.

• 3750 VRMS isolation test voltage.

• Low coupling capacitance and high common-mode transient immunity.

• Material categorisation in compliance with environmental standards.

Specifications

• While exact CTR bounds for the “-4” bin are not explicitly cited in the public table, the series CTR spans from 50 %–600 %.

• Other specs as per series: input forward voltage ~1.1–1.5 V (IF = 50 mA); coupling capacitance 0.3 pF; VCEO 80 V; VISO 3750 VRMS; breakdowns etc.

Applications

• Compact telecom modules and interface cards where board space is limited.

• Industrial sensor interfaces with isolation but minimal LED drive.

• Battery powered or handheld devices requiring high isolation and low power.

• Office automation equipment and embedded controller interfaces requiring galvanic separation.