FOD852

Overview

The FOD852 is a single-channel transistor output optocoupler featuring a gallium arsenide infrared emitting diode coupled to a silicon photodarlington output with an integrated base-emitter resistor. It provides high current transfer ratios ranging from 1000% to 15000%. The device supports a maximum collector-emitter voltage of 300 V and a peak forward current of 50 mA. Key electrical parameters include a 5000 Vrms isolation voltage, a typical forward voltage of 1.4 V, and a maximum collector current of 150 mA. The package offers robust insulation for industrial applications.

Feature Summary

• Integrates a silicon photodarlington output with an internal base-emitter resistor for enhanced stability
• Provides high isolation capability with 5000 Vrms dielectric strength between input and output circuits
• Delivers high current transfer efficiency suitable for driving loads directly without additional amplification

Applications

• Industrial automation control systems
• Power supply feedback loops
• Solid-state relay drivers

Procurement Notes

Verify the specific package variant required, as the FOD852 series includes both DIP and SMD configurations. Confirm that the selected part matches the intended mounting style and thermal requirements. Ensure compliance with RoHS directives if applicable to the final assembly. Cross-reference the datasheet specifications against system voltage and current limits before procurement.

Selection Notes

Select this component when high voltage isolation and high current gain are required in a compact form factor. The integrated base-emitter resistor simplifies circuit design by reducing external component count. Consider the slow switching speed inherent to photodarlington outputs; it is suitable for low-frequency applications but not for high-speed data transmission.

Part Context

The FOD852 belongs to the FOD852 family of photodarlington output optocouplers manufactured by onsemi. This family is designed for general-purpose isolation tasks where high current transfer ratio is critical. The device utilizes proprietary process technology to ensure reliability and consistent performance across varying temperature ranges.

Replacement Considerations

Compatible substitutes within the same family include the FOD8523SD for surface-mount applications. Verify pinout compatibility and electrical parameter equivalence when replacing existing components in established designs.