FODM2705R1

Overview

The FODM2705R1 is a single-channel transistor output optocoupler from onsemi, designed for AC input applications. It features an NPN phototransistor output with a maximum collector-emitter voltage of 40 V and a peak forward current of 50 mA. The device provides 3750 Vrms isolation voltage and operates within a temperature range of -40°C to +110°C. Key electrical parameters include a typical rise and fall time of 3 µs, a power dissipation of 150 mW, and a reverse voltage rating of 6 V. It is housed in a compact SMD-4 package.

Feature Summary

• Provides high-voltage electrical isolation between input and output circuits
• Supports both AC and DC input signal transmission
• Features fast switching characteristics suitable for digital communication
• Designed for surface-mount assembly in compact layouts

Applications

• AC mains detection and monitoring circuits
• Solid-state relay driver interfaces
• Microcontroller input isolation for industrial control systems
• Power supply feedback loops requiring galvanic isolation

Procurement Notes

Verify the specific suffix R1 against the manufacturer's latest datasheet to confirm active status, as some variants in this series may be obsolete. Ensure the ordering part number matches the required packaging format, such as cut tape or reel, as availability varies by distributor. Cross-reference the component marking with official documentation to prevent counterfeit substitution during procurement.

Selection Notes

Select this component when AC input compatibility is required alongside standard NPN phototransistor output characteristics. Consider the 3750 Vrms isolation rating for safety compliance in mains-connected designs. Evaluate the 3 µs propagation delay against system timing requirements. Confirm that the SMD-4 package dimensions fit the available PCB real estate compared to through-hole alternatives.

Part Context

This component belongs to the FODM2705 family of optocouplers manufactured by onsemi. The family is characterized by its ability to handle AC inputs directly without external rectification, simplifying circuit design. The R1 suffix typically denotes a specific tape-and-reel packaging configuration intended for automated surface-mount assembly processes.

Replacement Considerations

Public records indicate the FODM2705R1 may be obsolete. Verify availability of the base FODM2705 model or equivalent parametric substitutes from other manufacturers. Ensure replacement parts maintain the same 4-pin SMD footprint and isolation voltage ratings.