FOD8523SD

Overview

The FOD8523SD is a single-channel photodarlington output optocoupler manufactured by onsemi. It features a 4-pin SMD-4 surface-mount package designed for digital logic and microprocessor inputs. Key electrical parameters include an isolation voltage of 5000 Vrms, a maximum collector-emitter voltage of 300 V, and a maximum collector current of 150 mA. The device exhibits a high current transfer ratio ranging from 1000% to 15000%. Operating characteristics specify a forward current of 50 mA with a forward voltage of 1.4 V. Switching times are defined by a rise time of 300 µs and a fall time of 100 µs. The component supports a power dissipation of 200 mW and operates within a temperature range of -30°C to +100°C.

Feature Summary

• High current transfer ratio capability for efficient signal transmission
• Robust insulation voltage ensuring safe isolation between circuits
• Surface-mount configuration suitable for automated assembly processes

Applications

• Digital logic input interfacing
• Microprocessor input isolation
• General-purpose signal isolation in electronic systems

Procurement Notes

Verify the specific ordering suffix and package variant against the official datasheet to ensure compatibility with design requirements. Confirm that the selected component meets all necessary regulatory standards and safety certifications required for the target application environment. Cross-reference manufacturer specifications with distributor documentation to validate part authenticity and technical accuracy before procurement.

Selection Notes

Select this component when high gain and robust isolation are required for low-speed signal transmission. The photodarlington output provides significant current amplification, making it suitable for driving loads directly or interfacing with sensitive logic circuits. Consider the relatively slow switching speeds compared to standard transistor outputs when designing timing-critical applications.

Part Context

The FOD8523SD belongs to the FOD852 series of optocouplers from onsemi. This series focuses on providing high reliability and performance for industrial and commercial applications. The device utilizes gallium arsenide infrared LED technology coupled with a photodarlington receiver to achieve high current transfer ratios while maintaining compact physical dimensions through its surface-mount packaging.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.