FOD8143SD

Overview

The onsemi FOD8143SD is a single-channel transistor output optocoupler housed in a compact 4-SMD surface-mount package. It provides electrical isolation with a rated insulation voltage of 5000 Vrms, ensuring robust signal transmission across isolated circuits. The device features an NPN phototransistor output capable of handling a maximum collector current of 50 mA and a collector-emitter voltage of 70 V. Key electrical parameters include a forward voltage of 1.2 V typical, a saturation voltage of 200 mV maximum, and a current transfer ratio ranging from 20% to 300%. The unit supports AC/DC input signals and operates within a temperature range of -55°C to 105°C.

Feature Summary

• Provides high-voltage isolation between input and output circuits for noise immunity
• Features fast switching characteristics suitable for digital signal transmission
• Designed for surface-mount assembly to facilitate automated PCB placement

Applications

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

Procurement Notes

Verify the specific suffix '3' against official datasheets to confirm the exact Current Transfer Ratio (CTR) binning, as variations exist within the FOD814 series. Ensure the selected component matches the required isolation voltage standards for your application safety regulations. Confirm RoHS compliance status through the manufacturer's latest documentation before finalizing procurement specifications.

Selection Notes

Select this component when a small form factor is critical for space-constrained designs. Compare the 20-300% CTR range against circuit requirements to ensure adequate gain margins. Consider the 5000 Vrms isolation rating for applications demanding strict separation between high-voltage and low-voltage domains. Evaluate thermal performance within the specified operating temperature range during design integration.

Part Context

The FOD8143SD belongs to the broader FOD814 family of transistor output optocouplers manufactured by onsemi. This series is engineered for general-purpose isolation tasks, offering a balance of performance and reliability. The specific part number denotes a particular variant within the lineup, distinguished by its packaging style and electrical characteristics tailored for surface-mount technology implementations.

Replacement Considerations

Compatible substitutes within the same family include FOD814SD and FOD814A3SD. Verify pinout compatibility and electrical parameter alignment, particularly the Current Transfer Ratio and isolation voltage, before substituting. Cross-reference datasheets to ensure the alternative part meets all mechanical and environmental specifications of the original design.