FODM121R1

Overview

The FODM121R1 is a transistor output optoisolator manufactured by onsemi. It features a GaAs infrared LED coupled to an NPN phototransistor in a compact 4-SMD gull-wing package. Key electrical parameters include a 3750Vrms isolation voltage, 80V collector-emitter voltage, and 80mA maximum collector current. The device operates within a temperature range of -40°C to 110°C and has a typical rise/fall time of 3µs.

Feature Summary

• Integrates a GaAs infrared emitting diode with an NPN silicon phototransistor for signal transmission.
• Provides high-voltage electrical isolation between input and output circuits.
• Utilizes a compact surface-mount package suitable for space-constrained designs.

Applications

• General-purpose digital signal isolation
• Microcontroller interface circuits
• Low-speed data communication links

Procurement Notes

Verify component status as the FODM121R1 is listed as obsolete or discontinued by the manufacturer. Confirm availability through authorized distributors or secondary markets. Ensure any substitute components meet the required isolation voltage and package dimensions for your specific application design.

Selection Notes

Select this component when a low-cost, general-purpose transistor output isolator is required. Consider the 3750Vrms isolation rating and 4-SMD footprint. Evaluate alternative active parts if long-term supply stability is critical, as the R1 suffix indicates a specific tape-and-reel packaging variant that may be phased out.

Part Context

This part belongs to the FODM121 family of transistor output optocouplers from onsemi. These devices are designed for general-purpose isolation applications. The FODM121R1 specifically denotes the reel-packaged version of the standard FODM121A component, sharing identical electrical characteristics but differing in shipping configuration.

Replacement Considerations

FODM121A is a verified equivalent part number offering identical specifications in tube packaging.