Nexperia USA Inc. BUK7M5R0-40HX

Overview

BUK7M5R0-40HX from Nexperia is an AEC-Q101 qualified N-channel standard-level MOSFET in LFPAK33 (SOT1210) package, rated for 40 V V_DS, 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 - deployed in automotive 12 V powertrain and body control modules requiring high robustness and repetitive avalanche capability.

For engineers reviewing the BUK7M5R0-40HX datasheet, BUK7M5R0-40HX pinout, BUK7M5R0-40HX application, or BUK7M5R0-40HX equivalent, this page delivers verified electrical specs, thermal resistance (R_th(j-mb) = 1.61 K/W), gate charge (Q_G(tot) = 22–31 nC), avalanche energy rating (E_AS = 33 mJ), and LFPAK33 gull-wing terminal layout for manufacturable automotive PCB integration.

Technical Context

This MOSFET employs Trench 9 superjunction technology to achieve low conduction losses and high power density while maintaining stable threshold voltage (V_GS(th) = 2.4–3.6 V at 25 °C) across temperature. Its LFPAK33 copper-clip construction enables low junction-to-mounting-base thermal resistance and high mechanical reliability under thermal cycling.

The device features a repetitive avalanche-rated structure with soft reverse recovery (S = 0.66) and fast trr = 25 ns, supporting robust operation in inductive switching applications such as DC-DC converters and motor drives without external snubbers. Gate drive compatibility is ensured by V_GS = ±20 V absolute maximum rating and low Q_GD = 4–8 nC.

Key Specifications

Pinout & Package

LFPAK33 (SOT1210) is a single-ended surface-mount package with gull-wing leads, featuring a large copper mounting base connected to the drain for low-inductance, high-current routing and enhanced thermal transfer. The 8-lead layout includes three parallel source terminals, one gate terminal, and a drain-connected mounting base.

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, BUK7M5R0-40HX offers optimal balance of automotive qualification rigor, thermal performance (1.61 K/W), and switching efficiency (22–31 nC Q_G) - making it preferred for thermally demanding, safety-critical 12 V powertrain functions where long-term reliability is non-negotiable.

Availability

BUK7M5R0-40HX is available at Aetrix Electronics and suitable for automotive powertrain control, LED lighting systems, and 12 V DC-DC conversion requiring stable component supply across extended production lifecycles and stringent AEC-Q101 compliance.

Supply support for BUK7M5R0-40HX 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-qualified MOSFETs, ESD protection, and logic ICs.

BUK7M5R0-40HX belongs to Nexperia's LFPAK33 automotive MOSFET product line, engineered specifically for high-current, high-temperature 12 V vehicle systems where robustness, low R_DS(on), and repeatable avalanche performance are mandatory.

FAQ

What is the maximum continuous drain current for BUK7M5R0-40HX at 100 °C mounting base temperature?

At T_mb = 100 °C, the continuous drain current is 61.7 A per datasheet Figure 2. This derating reflects thermal limits of the LFPAK33 package and PCB layout - actual usable current depends on copper area, thermal vias, and ambient airflow. The 85 A rating applies only at T_mb = 25 °C with ideal heatsinking.

Is BUK7M5R0-40HX suitable for synchronous rectification in a 400 kHz buck converter?

Yes - its Q_GD = 4–8 nC, t_f = 5.5 ns, and soft reverse recovery (S = 0.66) minimize switching loss and voltage overshoot at 400 kHz. However, ensure gate driver can source/sink ≥2 A peak to fully charge Q_G(tot) = 22–31 nC within 20 ns, and verify layout parasitics do not induce oscillation on the 3-source-pin configuration.

How is the mounting base (drain) electrically isolated from the PCB during assembly?

The mounting base is electrically connected to the drain terminal and must be soldered directly to a dedicated PCB copper pour tied to the system drain net. No isolation is applied - thermal and electrical connection are co-designed. Use a thermally optimized stencil (0.125 mm thickness) and follow Nexperia's SOT1210 footprint in Figure 19 to ensure void-free solder joint integrity and low R_th.

Does BUK7M5R0-40HX require a gate resistor for safe operation in inductive switching?

A gate resistor is recommended to dampen ringing and control dV/dt, especially in high-di/dt motor drive applications. While the internal R_G = 0.3–2 Ω provides some damping, a 5–10 Ω external resistor is typical for 12 V automotive systems to limit peak gate current and suppress oscillation caused by PCB trace inductance interacting with C_iss and C_rss.