FOD617A3SD

Overview

The onsemi FOD617A3SD is a single-channel photovoltaic output optocoupler designed for surface-mount applications. It features a 4-pin SMD package with gull-wing leads, providing electrical isolation rated at 5000 Vrms between input and output circuits. The device utilizes a photovoltaic mechanism to generate output voltage without requiring an external power supply on the collector side, making it suitable for zero-crossing detection and high-impedance sensing. It operates within a temperature range of -55°C to +110°C and supports a maximum forward current of 50 mA.

Feature Summary

• Photovoltaic output architecture eliminates the need for external bias voltage on the output side
• High-voltage isolation capability ensures safe signal transmission across potential differences
• Surface-mount construction facilitates automated assembly and compact PCB layout

Applications

• Zero-crossing detection in AC mains monitoring systems
• Gate drive isolation for power switching devices
• Microcontroller interface isolation in industrial control panels

Procurement Notes

Verify the specific suffix 'A3SD' against the manufacturer's latest datasheet to confirm pinout orientation and tape-and-reel specifications. Ensure compliance with RoHS directives if required by the target market. Cross-reference ordering codes with authorized distributors to avoid obsolete or non-compliant variants.

Selection Notes

Select this component when galvanic isolation is required without active output circuitry. The photovoltaic output provides high impedance, necessitating careful consideration of load capacitance and response time compared to transistor-output alternatives. Evaluate thermal management requirements given the operating temperature limits and power dissipation constraints.

Part Context

This part belongs to the FOD617 series from onsemi, which focuses on high-isolation optocouplers for safety-critical applications. The series distinguishes itself through photovoltaic technology, offering unique advantages in noise immunity and simplicity for specific isolation tasks compared to standard transistor or logic-output isolators.

Replacement Considerations

Direct substitutes include other photovoltaic optocouplers such as the HCPL-2630 or ILD2xx series, provided they match the 5000 Vrms isolation rating and SMD package dimensions. Verify functional equivalence regarding open-circuit voltage and response characteristics before substitution.