FOD819SD

Overview

The FOD819SD is a high-speed transistor output optocoupler from onsemi, housed in a surface-mount SMD-4 package. It features an NPN phototransistor output with a minimum collector-emitter breakdown voltage (BVCEO) of 80V. The device supports AC/DC input and provides electrical isolation up to 5000 Vrms. Key performance metrics include a current transfer ratio ranging from 100% to 600%, a maximum forward current of 50 mA, and a typical rise/fall time of approximately 20 µs, enabling bandwidths around 30 kHz. It operates within a temperature range of -55°C to +110°C.

Feature Summary

• High-speed switching capability suitable for applications requiring bandwidths near 30 kHz
• Guaranteed minimum collector-emitter breakdown voltage of 80V for robust output handling
• Surface-mount SMD-4 configuration for compact PCB integration

Applications

• Signal isolation in industrial control systems
• Data transmission interfaces requiring high-speed response
• Power supply feedback loops

Procurement Notes

Verify the specific suffix against official datasheets to confirm pinout and electrical characteristics, as variations may exist within the series. Ensure compliance with RoHS directives if required by your application standards. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components. Confirm that the SMD-4 package dimensions match your board layout constraints prior to finalizing procurement.

Selection Notes

Select this component when high-speed signal isolation is required alongside a high-voltage output capability. The 80V BVCEO rating distinguishes it from standard 50V variants, making it suitable for higher voltage side applications. Consider the 30 kHz bandwidth limitation compared to faster logic-output optocouplers. The SMD-4 package offers space efficiency but requires appropriate surface-mount assembly processes.

Part Context

This device belongs to the FOD819 series of high-speed optocouplers manufactured by onsemi. It is designed to provide reliable galvanic isolation between input and output circuits while maintaining fast signal transmission speeds. The series is commonly used in environments where noise immunity and electrical safety are critical, leveraging the inherent properties of light-based signal transfer.

Replacement Considerations

Direct replacements must match the 80V BVCEO specification and high-speed characteristics. Verify pin compatibility for the SMD-4 package. Generic 50V optocouplers are not suitable substitutes due to lower voltage ratings. Consult onsemi documentation for qualified alternative part numbers within the same family.