FOD852SD

Overview

The FOD852SD is a single-channel photodarlington output optocoupler from onsemi, designed for digital logic and microprocessor inputs. It features a 4-pin SMT package with 5000 Vrms isolation voltage. Key electrical parameters include a minimum current transfer ratio of 1000% and a maximum of 15000%. The device supports a forward current of 50 mA with a forward voltage of 1.4 V. Maximum collector-emitter voltage is 300 V, and maximum collector current is 150 mA. Saturation voltage is 1.2 V max. Rise time is 300 us, and fall time is 100 us. Reverse voltage is 6 V, and power dissipation is 200 mW. Operating temperature range is -30 C to +100 C.

Feature Summary

• High current transfer ratio suitable for direct interface with digital logic
• Robust insulation capability for safe electrical isolation
• Compact surface-mount design for space-constrained applications

Applications

• Digital logic input interfacing
• Microprocessor input circuits
• Opto lighting systems

Procurement Notes

Verify the specific suffix SD against official datasheets to confirm the SMT-4 package type and reel/cut tape packaging options. Ensure compliance with RoHS directives as indicated in manufacturer specifications. Cross-reference safety ratings such as UL and VDE if used in isolated power supplies. Confirm operating temperature limits align with system requirements before procurement.

Selection Notes

Select this component when high current transfer ratio is required for efficient signal transmission. Consider the 5000 Vrms isolation rating for safety-critical designs. Evaluate the slow switching speeds (300 us rise/100 us fall) to ensure compatibility with low-frequency control signals rather than high-speed data lines.

Part Context

Part of the FOD852 series, which includes variants like FOD852S and FOD8523SD. These devices share similar photodarlington output characteristics but may differ in package style or specific electrical tolerances. The series targets general-purpose isolation needs in industrial and consumer electronics.

Replacement Considerations

Direct substitutes within the same family include FOD852S and FOD8523SD. Verify pinout and package dimensions match the existing PCB footprint. Check that replacement parts meet the same isolation voltage and current transfer ratio requirements.

FAQ

What is the typical output type of the FOD852SD?

The FOD852SD utilizes a photodarlington output configuration.

Is the FOD852SD suitable for high-speed applications?

No, its rise time of 300 us and fall time of 100 us make it suitable for low-speed or DC applications.