FOD815S

Overview

The onsemi FOD815S is a surface-mount phototransistor output optocoupler featuring a single channel in a compact 4-SMD package. It provides high isolation voltage of 5000Vrms between input and output circuits. The device utilizes an infrared LED coupled to a Darlington phototransistor, offering high current transfer ratios for efficient signal transmission. Key electrical parameters include a maximum forward voltage of 1.4V, a collector-emitter saturation voltage of 200mV, and a power dissipation rating of 200mW. Operating temperatures range from -55°C to +110°C, ensuring reliability in demanding environments.

Feature Summary

• High isolation voltage capability for safe circuit separation
• Darlington output configuration for enhanced gain
• Compact surface-mount design for space-constrained applications

Applications

• Industrial control systems requiring galvanic isolation
• Signal isolation in communication interfaces
• Power supply feedback loops

Procurement Notes

Verify the specific suffix and packaging type against official datasheets to ensure compatibility with automated assembly processes. Confirm RoHS compliance status and certification marks such as UL or VDE are present on documentation. Cross-reference part numbers with authorized distributors to avoid counterfeit components. Ensure storage conditions meet manufacturer specifications to maintain device integrity prior to use.

Selection Notes

Select this component when high current transfer ratio is required in a small footprint. Compare performance metrics against standard phototransistor outputs if lower gain suffices. Consider thermal management requirements given the power dissipation limits. Verify that the operating temperature range aligns with the intended application environment. Evaluate isolation voltage ratings against system safety standards.

Part Context

This component belongs to the FOD series of optocouplers from onsemi, designed for general-purpose isolation applications. The series offers various output configurations including phototransistor and Darlington types. These devices are widely used in industrial and consumer electronics for signal transmission across isolated boundaries. The FOD815S specifically targets applications needing robust isolation in a surface-mount format.

Replacement Considerations

Check for direct pin-compatible substitutes within the same family. Verify equivalent isolation voltage and current transfer ratio ranges. Ensure package dimensions match existing PCB layouts. Confirm regulatory certifications are identical or superior to original requirements.