FODM352R2

Overview

The FODM352R2 is a photodarlington optocoupler manufactured by onsemi, featuring a base-emitter resistor integrated into the output stage. It is housed in a 4-pin full pitch Mini-Flat package designed for surface-mount applications. The device provides electrical isolation between input and output circuits while transmitting signals via an internal infrared LED and phototransistor array. Key performance specifications include a collector-emitter saturation voltage of 1.0 V at 10 mA, a collector cutoff current of 10 nA, and a propagation delay of 10 µs. The unit offers high common-mode rejection and supports a continuous forward current of 60 mA with a peak pulse current capability of 1.5 A.

Feature Summary

• Integrated base-emitter resistor simplifies circuit design by eliminating external components
• High-speed switching capability with low propagation delay for efficient signal transmission
• Robust insulation performance ensuring reliable operation in noisy environments

Applications

• Industrial automation control systems requiring isolated signal interfaces
• Power supply feedback loops for voltage regulation and monitoring
• Solid-state relay driver circuits for AC/DC load switching

Procurement Notes

Verify the specific suffix R2 to confirm tape-and-reel packaging configuration when placing orders. Ensure compatibility with standard surface-mount reflow soldering profiles during assembly planning. Cross-reference the manufacturer datasheet for precise handling sensitivity and moisture level classifications prior to storage and manufacturing processes.

Selection Notes

Select this component when a built-in base-emitter resistor is required to stabilize the phototransistor output without adding discrete parts. Consider the Mini-Flat package dimensions for space-constrained PCB layouts. Evaluate the propagation delay and saturation voltage parameters against system timing requirements to ensure adequate signal integrity and switching speed.

Part Context

This part belongs to onsemi's family of photodarlington optocouplers designed for general-purpose isolation tasks. The inclusion of the base-emitter resistor distinguishes it from standard variants, offering improved noise immunity and faster turn-off times. It serves as a compact solution for isolating microcontroller outputs from higher voltage or noisy power stages in modern electronic designs.

Replacement Considerations

Direct substitutes may include other photodarlington optocouplers with similar pinouts and electrical characteristics. Verify that alternative parts support the same 4-pin Mini-Flat package and include the integrated base-emitter resistor feature to maintain circuit functionality without redesign.