FODM2701

Overview

The FODM2701 is a single-channel phototransistor output optocoupler featuring a gallium arsenide infrared emitting diode. It provides an isolation voltage of 3750Vrms and operates within a temperature range of -40°C to 110°C. The device supports a maximum DC forward current of 50mA with a typical forward voltage of 1.4V. Output specifications include a collector-emitter voltage of 40V, a maximum collector current of 80mA, and a saturation voltage of 300mV. The current transfer ratio ranges from 50% to 300% at 5mA input. Switching characteristics are defined by typical rise and fall times of 3µs each.

Feature Summary

• Integrates a gallium arsenide infrared LED with a phototransistor for signal transmission
• Provides high electrical isolation capability suitable for sensitive circuit protection
• Designed for surface-mount installation in compact electronic assemblies

Applications

• General-purpose digital signal isolation in industrial control systems
• Interface circuits between microcontrollers and peripheral devices
• Power supply feedback loop isolation

Procurement Notes

Verify the specific suffix designation when ordering, as packaging variants such as R4 indicate tape-and-reel configuration while other suffixes may denote cut tape or different handling methods. Confirm that the selected package matches the footprint requirements of the target PCB design. Ensure compliance with RoHS3 standards if environmental regulations apply to the final assembly. Cross-reference the manufacturer part number against distributor catalogs to confirm availability and lead times prior to procurement planning.

Selection Notes

Select this component when a low-cost, general-purpose optoisolator with moderate speed is required. The 3µs switching time suits applications where high-frequency data transmission is not critical. Verify that the 40V collector-emitter voltage rating exceeds the maximum load voltage in the output circuit. Consider the 50-300% CTR variation when designing bias networks to ensure reliable transistor saturation across all operating temperatures and unit-to-unit variations.

Part Context

The FODM2701 belongs to a series of phototransistor output optocouplers manufactured by onsemi. It shares architectural similarities with related models like the FODM121 and FODM2705, utilizing a standard Mini-Flat 4-pin package. This family of devices is designed to replace older through-hole optocouplers in modern surface-mount designs, offering comparable electrical performance in a smaller form factor.

Replacement Considerations

Direct pin-compatible substitutes within the same series include the FODM121 and FODM2705. When replacing, verify that the alternative part maintains the same 3750Vrms isolation rating and compatible current transfer ratio. Ensure the replacement package matches the Mini-Flat 4-pin footprint to avoid PCB layout modifications.