FODM121E

Overview

The FODM121E is a transistor output optocoupler manufactured by onsemi. It features a single channel with an NPN phototransistor output and DC input. The device provides 3750 Vrms isolation voltage. Key electrical parameters include a maximum collector-emitter voltage of 80 V, a maximum collector current of 80 mA, and a forward current of 50 mA. The typical rise and fall times are 3 µs. The unit operates within a temperature range of -40°C to +110°C.

Feature Summary

• Provides high-voltage electrical isolation between input and output circuits
• Utilizes a phototransistor output for signal transmission
• Designed for surface mount installation in compact applications

Applications

• General purpose digital signal isolation
• Microprocessor system interface circuits
• Solid-state relay driver circuits

Procurement Notes

Verify the specific suffix designation when sourcing this component, as variations such as FODM121AR2V indicate different packaging formats like tape and reel versus tube. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor declarations prior to integration into production designs.

Selection Notes

Select this component for applications requiring robust galvanic isolation with moderate switching speeds. Ensure the design accommodates the specified collector-emitter voltage and current limits. Verify that the operating temperature range meets the environmental requirements of the target system.

Part Context

This part belongs to the FODM121 series of transistor output optocouplers from onsemi. The series is characterized by its small form factor and reliable performance in isolating low-power control signals from higher voltage loads or noisy environments.

Replacement Considerations

Publicly documented substitutes include the FODM121A. Verify pin compatibility and electrical specifications before substitution.