FODM121BR1

Overview

The FODM121BR1 is a single-channel phototransistor output optoisolator manufactured by onsemi. It provides electrical isolation with a rated voltage of 3750Vrms. The device features an NPN phototransistor output capable of handling a maximum collector current of 80mA and a collector-emitter voltage of 80V. Typical switching characteristics include rise and fall times of 3µs. The component operates within a temperature range of -40°C to 110°C and is supplied in a 4-SMD surface-mount package.

Feature Summary

• Provides high-voltage galvanic isolation between input and output circuits
• Utilizes a compact 4-pin surface-mount package for space-constrained designs
• Features a standard NPN phototransistor output configuration

Applications

• General-purpose signal isolation in industrial control systems
• Interface circuits for microcontrollers and logic gates
• Power supply feedback loops requiring electrical separation

Procurement Notes

Verify the obsolete status of this specific part number before procurement planning, as it may no longer be actively manufactured. Confirm availability through authorized distributors or secondary market suppliers if inventory is required. Ensure that any substitute components meet the same isolation voltage and pinout specifications to maintain system integrity without redesigning the PCB layout.

Selection Notes

Select this component when a low-cost, general-purpose optoisolator is sufficient for applications not requiring high-speed data transmission. The 3µs switching speed limits its use to lower frequency signals. Consider the 4-SMD footprint compatibility during the initial schematic capture phase. Evaluate thermal management requirements based on the specified operating temperature range and power dissipation limits under maximum load conditions.

Part Context

This device belongs to the FODM121 series of transistor-output optoisolators from onsemi. These components are designed for basic isolation tasks where cost-effectiveness and reliability are prioritized over high-speed performance. The series typically includes variants with different packaging options such as DIP and SMD formats, catering to diverse manufacturing processes.

Replacement Considerations

Public confirmed substitute part numbers: FODM121A, FODM124, FODM2701, FODM2705.