BUK7Y21-40EX

Overview

The Nexperia BUK7Y21-40EX is an N-channel standard level MOSFET utilizing TrenchMOS technology, housed in an LFPAK56 (Power-SO8) surface-mount package. It features a drain-source voltage of 40 V and a continuous drain current of 33 A at 25 °C mounting base temperature. The device exhibits a maximum on-state resistance of 21 mΩ at VGS = 10 V and ID = 10 A. Total power dissipation reaches 45 W under specified conditions. The component supports junction temperatures up to 175 °C and includes repetitive avalanche rating capabilities.

Feature Summary

• Qualified for high-performance automotive applications in accordance with the AEC-Q101 standard.
• Capable of operating reliably in thermally demanding environments due to a 175 °C junction temperature rating.
• Features true standard level gate drive characteristics with a threshold voltage exceeding 1 V at elevated temperatures.
• Rated for repetitive avalanche energy to withstand inductive load switching stresses.

Applications

• 12 V automotive systems
• Motor, lamp, and solenoid control circuits
• Transmission control modules
• Ultra-high performance power switching

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm exact packaging and reel specifications. Confirm that the delivered components match the required AEC-Q101 qualification status for your target application. Ensure thermal management designs account for the specified junction-to-mounting base thermal resistance values provided in the datasheet.

Selection Notes

Select this component for designs requiring robust N-channel switching with standard gate drive compatibility. The LFPAK56 package offers a balance of thermal performance and footprint efficiency suitable for automotive PCB layouts. Consider the 40 V voltage rating and 21 mΩ on-resistance when calculating conduction losses and ensuring adequate headroom for system voltage spikes.

Part Context

This device belongs to Nexperia's portfolio of automotive-grade power MOSFETs designed for reliability in harsh environments. The BUK7Y21-40E variant utilizes TrenchMOS technology to achieve low conduction losses while maintaining high ruggedness. It is specifically engineered to meet the stringent quality and longevity requirements of modern vehicle electrical architectures.

Replacement Considerations

Consult official Nexperia substitution guides for verified alternatives. Cross-reference pinouts, thermal resistance, and electrical limits before integrating any substitute part number into existing designs.

FAQ

What is the gate-source threshold voltage specification at high temperatures?

The gate-source threshold voltage is rated to be greater than 1 V at a junction temperature of 175 °C, ensuring reliable turn-on under extreme thermal conditions.

Is the device suitable for automotive use?

Yes, the BUK7Y21-40EX is designed and qualified to the AEC-Q101 standard for use in high-performance automotive applications.