FOD817CSD

Overview

The FOD817CSD is a single-channel transistor output optocoupler from onsemi, designed for surface-mount applications in an SMD-4 package. It features an NPN phototransistor output with a maximum collector-emitter voltage of 70 V and a peak forward current rating of 50 mA. The device provides high isolation capability with an insulation voltage of 5000 Vrms. Electrical performance includes a minimum current transfer ratio (CTR) of 200% and a maximum CTR of 400%, ensuring reliable signal transmission. Switching characteristics are defined by rise and fall times of 18 µs each. The component operates within a temperature range of -55°C to +110°C and supports a maximum power dissipation of 200 mW.

Feature Summary

• Provides galvanic isolation between input and output circuits using infrared LED and phototransistor technology
• Offers high common-mode transient immunity suitable for noisy industrial environments
• Features compact surface-mount packaging for automated assembly processes
• Delivers consistent current transfer ratio across specified operating temperatures

Applications

• Industrial control systems requiring signal isolation
• Power supply feedback loops for voltage regulation
• Communication interface isolation for data transmission
• Solid-state relay driver circuits

Procurement Notes

Verify the specific suffix 'CSD' against the official onsemi datasheet to confirm the exact current transfer ratio binning and packaging configuration. Ensure that the procurement source provides valid RoHS compliance documentation as required by regulatory standards. Cross-reference the manufacturer part number with authorized distributor catalogs to avoid counterfeit components. Confirm that the received units match the specified SMD-4 package dimensions and pinout arrangement before integration into the design.

Selection Notes

Select this component when a surface-mount solution is required for general-purpose isolation with moderate speed requirements. The 200% to 400% CTR range makes it suitable for applications needing robust signal coupling without excessive drive current. Consider thermal management capabilities given the 200 mW power dissipation limit. Evaluate the 18 µs switching speed against system timing constraints to ensure adequate response time for the intended application frequency.

Part Context

This device belongs to the FOD817 series of 4-pin DIP phototransistor optocouplers manufactured by onsemi. The series is widely recognized for its reliability in isolation applications. The FOD817CSD variant specifically denotes the surface-mount version with defined electrical characteristics. It serves as a modern alternative to through-hole equivalents in compact PCB designs.

Replacement Considerations

Direct substitutes include other FOD817 series variants such as FOD817CS or FOD817D3SD, provided their current transfer ratio specifications align with circuit requirements. Verify pin compatibility and package dimensions when replacing with generic 4-pin SMD optocouplers. Ensure replacement parts meet the same isolation voltage and temperature rating standards.