Nexperia USA Inc. BUK9M7R2-40EX

Overview

BUK9M7R2-40EX from Nexperia is an AEC-Q101-qualified N-channel logic-level MOSFET in LFPAK33 (SOT1210) package, rated for 40 V V_DS, 7.2 mΩ R_DS(on) at V_GS = 5 V and T_j = 25 °C, and 175 °C junction operation. It delivers 70 A continuous drain current at T_mb = 25 °C and supports ultra-high-performance power switching in 12 V automotive systems.

For engineers reviewing the BUK9M7R2-40EX datasheet, BUK9M7R2-40EX pinout, BUK9M7R2-40EX application, or BUK9M7R2-40EX equivalent, key selection criteria include its true logic-level gate (V_GS(th) > 0.5 V at 175 °C), repetitive avalanche rating, 1.58 K/W junction-to-mounting-base thermal resistance, and LFPAK33 package suitability for thermally demanding automotive PCB layouts.

Technical Context

This MOSFET employs TrenchMOS technology to achieve low on-resistance and fast switching with Q_GD = 7.4 nC and t_f = 22 ns under standard test conditions (V_DS = 30 V, R_G(ext) = 5 Ω). Its gate threshold voltage remains functional up to 175 °C, enabling stable control in engine bay environments.

The device integrates a robust source-drain diode with V_SD = 0.83 V at I_S = 20 A and T_j = 25 °C, and supports unclamped inductive switching with E_AS = 58.8 mJ at I_D = 70 A. Mounting base (drain-connected) thermal path enables direct heatsinking without isolation.

Key Specifications

Pinout & Package

LFPAK33 (SOT1210) is a surface-mount, single-ended power package with exposed drain mounting base for enhanced thermal performance. The package features 8 leads but only four electrically active terminals: three paralleled source pins, one gate pin, and the mounting base connected to drain.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel automotive MOSFET applications.

Compared with STL220N4F7AG and NTMFS5C428NT1G, BUK9M7R2-40EX uniquely combines true 5 V logic-level operation, AEC-Q101 certification, and robust avalanche ruggedness-making it the preferred choice for safety-critical 12 V automotive load switching where gate drive simplicity and reliability are mandatory.

Availability

BUK9M7R2-40EX is available at Aetrix Electronics and suitable for engine control modules, automatic transmission valve bodies, and electric power steering systems requiring stable component supply and long-term automotive lifecycle support.

Supply support for BUK9M7R2-40EX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified MOSFETs and ESD protection.

BUK9M7R2-40EX belongs to Nexperia's LFPAK automotive MOSFET product line, engineered specifically for thermally demanding 12 V vehicle subsystems where logic-level drive, avalanche ruggedness, and AEC-Q101 compliance are essential.

FAQ

Is BUK9M7R2-40EX pin-compatible with other LFPAK33 MOSFETs?

Yes-BUK9M7R2-40EX uses the standardized SOT1210 footprint and shares identical pin assignment (pins 1–3 = source, pin 4 = gate, mounting base = drain) with all Nexperia LFPAK33 N-channel MOSFETs. This enables drop-in replacement within the same voltage and R_DS(on) class, provided thermal and layout constraints are verified.

What is the maximum safe continuous drain current at 100 °C mounting base temperature?

Per Figure 2 of the datasheet, the continuous drain current is derated to 52 A at T_mb = 100 °C with V_GS ≥ 5 V. This value accounts for thermal limitations of the LFPAK33 package and must be used in thermal design calculations-not the 70 A rating at 25 °C.

Does BUK9M7R2-40EX require a gate resistor for automotive PWM applications?

A gate resistor is recommended to control dV/dt and prevent oscillation, especially in high-noise engine environments. Typical values range from 5 Ω to 22 Ω depending on switching frequency and EMI requirements; 10 Ω is commonly used for 1–20 kHz PWM in solenoid drivers.

Can the mounting base be electrically isolated from the PCB ground plane?

No-the mounting base is internally connected to the drain terminal and must be soldered to a copper pour tied to the drain net. Isolating it would break the primary thermal path and violate the device's thermal specification; electrical isolation requires a separate heatsink with insulating thermal pad.