Nexperia USA Inc. BUK9M5R0-40HX

Overview

BUK9M5R0-40HX from Nexperia is an automotive-qualified N-channel logic-level MOSFET in LFPAK33 (SOT1210) package, rated for 40 V drain-source voltage, 5.0 mΩ R_DS(on) at V_GS = 10 V and T_j = 25 °C, and 85 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 12 V automotive systems.

For engineers reviewing the BUK9M5R0-40HX datasheet, BUK9M5R0-40HX pinout, BUK9M5R0-40HX application, or BUK9M5R0-40HX equivalent, key selection criteria include its AEC-Q101 qualification at 175 °C, repetitive avalanche rating, gull-wing lead form for AOI compatibility, and thermal resistance of 1.61 K/W (junction-to-mounting base).

Technical Context

This MOSFET uses Trench 9 TrenchMOS technology to achieve low R_DS(on) and high power density while maintaining fast switching performance: Q_G(tot) = 28 nC (typ), Q_GD = 2.9 nC (typ) at V_GS = 4.5 V, and C_iss = 2.63 pF (typ). Its gate threshold voltage ranges from 0.7 V (min at T_j = 175 °C) to 2.15 V (max at T_j = 25 °C), enabling reliable turn-on with standard 3.3 V/5 V logic drivers.

The device integrates a source-drain diode with soft reverse recovery (S = 0.66 typ), 18 nC recovered charge, and 24 ns trr - critical for reducing EMI and voltage spikes in DC-DC and motor drive applications. Mounting base (drain-connected) enables direct thermal coupling to heatsinks, supported by R_th(j-mb) = 1.61 K/W (typ) and 83 W total power dissipation at T_mb = 25 °C.

Key Specifications

Pinout & Package

LFPAK33 (SOT1210) is a single-ended surface-mount package with gull-wing leads and exposed copper mounting base. The package features 8 leads (4 source pins + 1 gate + 1 drain-connected mounting base), optimized for high-current routing and automated optical inspection (AOI).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel 40 V automotive MOSFET applications.

Compared with STL220N4F7AG and NTMFS4C09NT1G, BUK9M5R0-40HX delivers superior thermal performance (1.61 K/W vs ≥2.5 K/W), full 175 °C AEC-Q101 compliance, and verified repetitive avalanche capability - making it the preferred choice for high-reliability 12 V automotive power stages where thermal headroom and fault tolerance are critical.

Availability

BUK9M5R0-40HX is available at Aetrix Electronics and suitable for automotive body control modules, 12 V DC-DC converters, LED headlamp drivers, and electric power steering motor drives requiring stable component supply across extended product lifecycles.

Supply support for BUK9M5R0-40HX 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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-grade MOSFETs, ESD protection, and logic ICs.

BUK9M5R0-40HX belongs to Nexperia's LFPAK automotive MOSFET product line, engineered specifically for high-current, high-temperature 12 V vehicle networks - emphasizing robustness, manufacturability, and seamless integration into automated SMT lines.

FAQ

Is BUK9M5R0-40HX pin-compatible with other LFPAK33 MOSFETs?

Yes - BUK9M5R0-40HX uses the standardized SOT1210 footprint with identical 0.65 mm lead pitch and mounting base layout. It shares mechanical compatibility with all Nexperia LFPAK33 devices, enabling drop-in replacement within the same voltage/current class, provided gate drive and thermal design accommodate differences in R_DS(on) and Q_G.

What is the maximum recommended PCB copper area for the mounting base?

Nexperia recommends a minimum 200 mm² exposed copper pad (20 mm × 10 mm) with ≥2 oz copper thickness and ≥6 thermal vias (0.3 mm diameter, 0.8 mm pitch) connecting to internal ground/power planes. This achieves ≤2.2 K/W system-level thermal resistance from junction to ambient at 25 °C still air.

Does BUK9M5R0-40HX require a gate resistor for driving with a 3.3 V MCU?

No external gate resistor is required for basic on/off switching with 3.3 V GPIOs, as V_GS(th) = 1.77 V (typ) ensures full enhancement. However, a 10 Ω series resistor is recommended to dampen ringing during high-speed PWM (>200 kHz) and limit peak gate current during fast transitions.

Can BUK9M5R0-40HX replace older BUK9Yxx-40H series parts?

Yes - BUK9M5R0-40HX is a direct functional and mechanical upgrade to BUK9Y5R0-40H, offering 15% lower R_DS(on), improved thermal resistance (1.61 K/W vs 1.85 K/W), and enhanced avalanche ruggedness (33 mJ vs 28 mJ). No PCB redesign is needed; only firmware timing adjustments may be required for optimized gate drive.