Nexperia USA Inc. BUK9M15-40HX

Overview

BUK9M15-40HX from Nexperia is an AEC-Q101 qualified N-channel logic-level MOSFET in LFPAK33 (SOT1210) package, rated for 40 V V_DS, 15.0 mΩ R_DS(on) at V_GS = 10 V and T_j = 25 °C, and 30 A continuous drain current at T_mb = 25 °C. It employs Trench 9 superjunction technology and copper-clip LFPAK construction for high power density and robustness in automotive power switching.

For engineers reviewing the BUK9M15-40HX datasheet, BUK9M15-40HX pinout, BUK9M15-40HX application, or BUK9M15-40HX equivalent, key selection criteria include its 175 °C junction rating, repetitive avalanche capability, gull-wing lead form for AOI compatibility, and low R_DS(on) at 4.5 V gate drive-critical for 12 V automotive body control and DC-DC converter designs.

Technical Context

This MOSFET uses Trench 9 TrenchMOS architecture to achieve low conduction loss and high switching efficiency. Its LFPAK33 package integrates a copper clip for low thermal resistance (R_th(j-mb) = 3.22 K/W typ) and enhanced power cycling reliability.

The device features a gate threshold voltage (V_GS(th)) of 1.5–2.2 V at 25 °C and remains functional down to 0.7 V at 175 °C, enabling stable turn-on with standard 3.3 V or 5 V logic controllers. Its source-drain diode exhibits soft reverse recovery (S = 0.57) and 11 nC recovered charge, reducing EMI in inductive switching.

Key Specifications

Pinout & Package

LFPAK33 (SOT1210) is a surface-mount, single-ended package with gull-wing leads and an exposed mounting base connected to the drain. Its 0.65 mm pitch and 3.2 × 2.0 mm footprint support high-density automotive PCB layouts and automated optical inspection (AOI).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STL220N4F7AG and NTMFS4C09NT1G, BUK9M15-40HX uniquely balances AEC-Q101 qualification, repetitive avalanche capability, and LFPAK33's superior thermal performance-making it optimal for thermally demanding, safety-critical 12 V automotive power stages.

Availability

BUK9M15-40HX is available at Aetrix Electronics and suitable for automotive body control modules, engine cooling fan drivers, and DC-DC converter designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for BUK9M15-40HX 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 essential semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer markets.

BUK9M15-40HX belongs to Nexperia's Automotive Logic-Level MOSFET product line, engineered specifically for robust, high-efficiency 12 V power switching in harsh automotive environments-including powertrain, chassis, and infotainment subsystems.

FAQ

What is the maximum continuous drain current for BUK9M15-40HX under real-world PCB conditions?

The datasheet specifies 30 A continuous drain current at T_mb = 25 °C with ideal heatsinking. In practice, sustained current is limited by PCB copper area, ambient temperature, and airflow. With 2 oz copper on 2-layer boards and moderate forced convection, 15–22 A is achievable while maintaining T_j ≤ 150 °C. Thermal simulation using the 3.22 K/W R_th(j-mb) value is recommended for final design validation.

Does BUK9M15-40HX support 3.3 V microcontroller gate drive?

Yes-BUK9M15-40HX has a typical V_GS(th) of 1.85 V and delivers 15.3 mΩ R_DS(on) at V_GS = 4.5 V and T_j = 25 °C. At 3.3 V gate drive, R_DS(on) rises to ~22 mΩ (typ), supporting ≤12 A continuous current with acceptable thermal margin. For full 30 A capability, 4.5 V or higher gate drive is required.

How does the LFPAK33 package improve reliability over traditional SO-8 or DPAK?

LFPAK33 replaces bond wires with a copper clip connecting die to leads and mounting base, reducing parasitic inductance by >50% and thermal resistance by ~40% versus SO-8. Its gull-wing leads provide stronger mechanical attachment and better solder joint reliability under thermal cycling-validated per AEC-Q200. The exposed drain base also enables direct thermal interface to heatsinks without thermal pads.

Is the source-drain diode suitable for freewheeling in inductive loads?

Yes-the integrated body diode is optimized for soft recovery (S = 0.57) and rated for 30 A continuous source current. Its 11 nC recovered charge and 19 ns reverse recovery time minimize voltage overshoot and EMI during flyback transitions in motor and solenoid drivers. Repetitive avalanche capability further enhances system-level robustness during transient overloads.