4N45#300

Overview

The Broadcom Limited 4N45#300 is a high-speed phototransistor optocoupler featuring a single channel in an 8-pin DIP package. It provides 3750 Vrms isolation and supports data rates up to 1 MBd. Key electrical parameters include a collector-emitter saturation voltage of 0.4V at 16mA, a forward current of 16mA, and a CTR range of 25% to 100%. The device operates within a temperature range of -55°C to +100°C and consumes 100mW of power.

Feature Summary

• High-speed signal transmission capability for digital isolation applications
• Robust insulation barrier ensuring safety compliance
• Phototransistor output configuration for reliable switching

Applications

• Industrial communication interfaces
• Power supply feedback loops
• Microcontroller input isolation

Procurement Notes

Verify the specific suffix #300 against official datasheets to confirm packaging and RoHS status. Confirm availability as distribution channels may vary. Ensure compatibility with existing PCB footprints and thermal management requirements before finalizing procurement decisions.

Selection Notes

Select this component when high-speed digital isolation is required alongside standard phototransistor output characteristics. Consider the 3750 Vrms isolation rating for safety-critical circuits. Evaluate the 1 MBd data rate against system timing constraints and ensure the operating temperature range meets environmental specifications.

Part Context

This part belongs to the 4N series of optocouplers manufactured by Broadcom Limited. It represents a legacy high-speed variant designed for robust industrial and commercial applications requiring galvanic isolation between low-voltage control circuits and higher-voltage loads or noisy environments.

Replacement Considerations

Direct replacements include the HCPL-4503#300 for similar performance in an 8-pin DIP package. Verify pinout compatibility and electrical parameter overlaps such as CTR and isolation voltage before substitution.