FOD8143S

Overview

The onsemi FOD8143S is a single-channel transistor output optocoupler designed for surface-mount applications. It features an NPN phototransistor output with a collector-emitter voltage of 70V and a maximum collector current of 50mA. The device provides high isolation voltage of 5000Vrms and supports AC/DC input signals. Key electrical parameters include a typical rise time of 4µs and fall time of 3µs, with a minimum current transfer ratio of 20% at 1mA forward current. Operating temperature range spans from -55°C to +105°C.

Feature Summary

• Provides galvanic isolation between input and output circuits using LED and phototransistor technology
• Supports both AC and DC input signal types for versatile interface applications
• Features high insulation voltage capability for safety-critical signal transmission
• Designed for surface-mount assembly to facilitate automated PCB manufacturing

Applications

• General-purpose signal isolation in industrial control systems
• Interface circuits for microcontrollers and logic families
• Power supply feedback loops requiring electrical isolation
• Lighting control systems utilizing opto-isolated switching

Procurement Notes

Verify the specific suffix designation against official datasheets to confirm package type and tape/reel specifications. Ensure compliance with RoHS directives if required by your application standards. Cross-reference manufacturer part numbers with distributor catalogs to confirm availability and lead times. Validate thermal management requirements based on power dissipation limits in your final enclosure design.

Selection Notes

Select this component when high-speed switching is not critical but robust isolation is required. Compare current transfer ratio variations across different operating temperatures. Consider the 4-SMD package dimensions for board space constraints. Evaluate the 5000Vrms isolation rating against system safety requirements. Confirm compatibility with input drive voltages and output load conditions.

Part Context

The FOD8143S belongs to the FOD814 series of optocouplers from onsemi. This series is engineered for general-purpose isolation tasks. The device complements through-hole variants like the FOD814300W by offering a compact surface-mount alternative. It shares functional similarities with other single-channel transistor output isolators while providing specific performance characteristics tailored for modern PCB layouts.

Replacement Considerations

Direct substitutes may include other FOD814 series variants such as FOD814SD or FOD8143SD, provided pinout and electrical parameters match. Verify equivalent isolation voltage and current transfer ratio ranges before substitution. Ensure replacement components meet the same mechanical footprint and mounting requirements.