NXP BUK964R4-40B: A Comprehensive Technical Overview of the 40V, 83A Logic Level Power MOSFET
In the realm of power electronics, the selection of the right MOSFET is critical for achieving optimal efficiency, thermal performance, and reliability in demanding applications. The NXP BUK964R4-40B stands out as a robust 40V, 83A logic level Power MOSFET engineered to meet these challenges in a compact, surface-mount package. This article provides a detailed technical examination of its key attributes and typical use cases.
Core Electrical Characteristics and Advantages
The BUK964R4-40B is built upon NXP's advanced TrenchMOS technology, a hallmark for low on-state resistance and high switching performance. Its most defining feature is its exceptionally low maximum drain-source on-state resistance (RDS(on)) of just 1.8 mΩ at a gate-source voltage (VGS) of 10 V. This ultra-low RDS(on) is the primary determinant of the MOSFET's efficiency, as it minimizes conduction losses, leading to less heat generation and higher overall system efficiency.
A significant advantage of this MOSFET is its logic level compatibility. It is fully enhanced at a VGS of 5 V, making it directly controllable by modern microcontrollers (MCUs), DSPs, and other low-voltage logic circuits without the need for additional level-shifting circuitry. This simplifies design, reduces component count, and saves board space.
Furthermore, the device is capable of handling a continuous drain current (ID) of up to 83 A at a case temperature (TC) of 25°C, with a pulsed drain current (IDM) rating of 320 A. This high current capability, combined with its 40V drain-source voltage (VDS) rating, makes it suitable for a wide array of high-current switching tasks in common low-voltage environments.
Thermal and Package Considerations
The BUK964R4-40B is offered in the LFPAK 56 (SON 8x8) package. This package is renowned for its superior thermal performance and power density compared to larger packages like the D2PAK. Its compact footprint saves valuable PCB real estate, while its exposed copper leadframe provides a very low thermal resistance from junction to case (RthJC) of just 0.5 °C/W. This efficient heat dissipation path is crucial for managing the thermal load in high-power applications, allowing designers to create smaller, more powerful, and more reliable end products.
Target Applications
The combination of high current handling, low RDS(on), logic-level gate drive, and excellent thermal performance makes the BUK964R4-40B an ideal choice for a diverse range of applications, including:
DC-DC Converters: Especially in high-current synchronous buck and boost converters for server, telecom, and computing infrastructure.
Motor Control: Driving brushed DC motors in industrial automation, robotics, and automotive systems (e.g., electric power steering, pump control).
Power Management Systems: Serving as a main switch in battery management systems (BMS), load switches, and OR-ing controllers.
High-Current Switching: In power distribution systems and solid-state relays.
ICGOODFIND Summary
The NXP BUK964R4-40B is a high-performance logic-level Power MOSFET that excels in minimizing power losses and maximizing power density. Its standout features—ultra-low 1.8 mΩ RDS(on), 5V logic level drive, and thermally efficient LFPAK package—make it a superior component for designers seeking to enhance efficiency and reliability in space-constrained, high-current applications up to 40V.
Keywords:
1. Logic Level MOSFET
2. Low RDS(on)
3. LFPAK Package
4. High Current Switching
5. TrenchMOS Technology
