MC33981ADHFKR2

Overview

The MC33981ADHFKR2 is a high-frequency, self-protected single high-side switch manufactured by NXP Semiconductors. It features a maximum on-resistance of 4.0 mΩ and supports PWM clock frequencies up to 60 kHz with duty cycles ranging from 5% to 100%. The device integrates comprehensive protection mechanisms including overcurrent, overtemperature, undervoltage shutdown, reverse battery protection, and fault reporting. It also provides output current monitoring, temperature feedback, and a gate drive signal for an external low-side N-channel MOSFET.

Feature Summary

• Integrates a single high-side switch with very low standby current consumption
• Provides built-in overcurrent, overtemperature, and undervoltage protection with fault reporting
• Includes reverse battery protection and output current monitoring capabilities
• Offers slew rate control via an external capacitor and a dedicated gate drive signal

Applications

• Power management applications requiring relay replacement
• Automotive lighting systems
• Solenoid and valve control circuits
• High-current load switching in industrial equipment

Procurement Notes

Verify the specific suffix 'R2' against official NXP documentation to confirm tape-and-reel packaging specifications. Ensure the ordering part number matches the exact voltage and temperature grade requirements for your design. Cross-reference the datasheet revision date to confirm compatibility with your system's electrical constraints.

Selection Notes

Select this component when a robust, single-channel high-side switch with integrated protection is required. It is suitable for designs needing PWM dimming or control at frequencies up to 60 kHz. Consider its thermal performance and package type relative to the expected load current and ambient operating conditions.

Part Context

This part belongs to the MC33981 family of high-side switches designed to replace electromechanical relays and fuses. The ADHFK variant indicates a specific package configuration, while the R2 suffix typically denotes reel packaging. These devices are engineered for automotive and industrial environments demanding high reliability and compact power solutions.

Replacement Considerations

Direct substitutes include other variants within the MC33981 family such as the MC33981ABHFK or MC33981ADHFK. Verify pinout compatibility and electrical parameters before substitution. Generic high-side switches may lack the integrated self-protection features.