SFH655A

Overview

The SFH655A is a single-channel optocoupler featuring a Gallium Arsenide infrared LED coupled to a silicon photodarlington detector. It provides an isolation voltage of 5300 Vrms and operates within a temperature range of -40°C to +100°C. The device supports a maximum forward current of 60 mA with a typical forward voltage of 1.6 V. Output specifications include a collector-emitter saturation voltage of 300 mV and a reverse voltage rating of 6 V. Power dissipation is rated at 150 mW, ensuring reliable signal transmission across isolated circuits.

Feature Summary

• Integrates a Gallium Arsenide infrared LED with a high-gain silicon photodarlington output for efficient signal coupling.
• Provides robust electrical isolation with a 5300 Vrms dielectric strength between input and output sections.
• Designed for through-hole DIP-4 packaging to facilitate standard circuit board integration.

Applications

• Industrial control systems requiring galvanic isolation
• Solid-state relay driver circuits
• Microprocessor interface isolation

Procurement Notes

Verify the specific suffix (e.g., X009T) against the required package variant, as suffixes denote physical form factors rather than functional changes. Confirm RoHS compliance status via the official datasheet before procurement. Ensure the supplier provides traceable documentation matching the Vishay Semiconductor Opto Division part number to avoid counterfeit components.

Selection Notes

Select this component when high isolation voltage and darlington gain are required. Compare CTR ranges against other VO615A variants if specific gain levels are needed. Verify thermal management requirements for the 150 mW power dissipation limit in enclosed environments.

Part Context

The SFH655A belongs to Vishay's family of transistor-output optocouplers. It shares architectural similarities with the VO615A series but differs in isolation ratings and output configuration. This model serves as a specialized solution for applications demanding higher voltage isolation compared to standard 5000 Vrms devices.

Replacement Considerations

The VO615A series is listed as a recommended alternative. Note that VO615A variants typically offer 5000 Vrms isolation and different CTR ranges. Verify pinout compatibility and thermal limits before substitution.