Vishay VOS618A-8T High-CTR Miniature Optocoupler for Low-Power Signal Isolation

• Very High CTR (130–260 %): Enables ultra-low drive currents from the LED side, reducing power consumption.
• Strong Isolation Capability: 3750 VRMS isolation ensures robust separation of circuits in harsh electrical environments.
• Compact SSOP-4 Mini-Flat Package: Designed for PCB area savings and surface-mount reliability.

The Vishay VOS618A-8T is a member of the VOS618A series specifying the “-8” CTR bin (130 %–260 %) (IF = 1 mA, VCE = 5 V) in the standard SSOP-4 half-pitch package. 
It features the same optocoupler architecture: a GaAs infrared-emitter diode and silicon phototransistor detector, in a 4-pin mini-flat package. This high-CTR version provides designers with elevated coupling efficiency, enabling minimal input LED drive and maximizing the signal integrity while maintaining isolation.

Features

• High current transfer ratio: 130 %–260 %.

• Low-profile SSOP-4 package with 50 mil lead pitch.

• High collector-emitter voltage rating (80 V).

• High isolation test voltage of 3750 VRMS.

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

• RoHS/REACH compliant materials and categorisation.

Specifications

• CTR (IF = 1 mA, VCE = 5 V): min 130 %, max 260 %.

• Other series-wide specs: VCEO 80 V, CC ~0.3 pF, VISO 3750 VRMS etc.

Applications

• Low-power portable and wearable equipment where minimal input current is critical.

• Compact telecom interface modules requiring high isolation and efficient coupling.

• Industrial sensor interface circuits where signal fidelity and low drive are important.

• Office and automation equipment with constrained PCB space and stringent isolation demands.