Nexperia USA Inc. BUK7M12-40EX

Overview

BUK7M12-40EX from Nexperia is a standard-level N-channel TrenchMOS power transistor in LFPAK33 (SOT1210) package, rated for 40 V V_DS, 12 mΩ R_DS(on) at 10 V V_GS and 25 °C, and qualified to AEC-Q101 for automotive use. It delivers 48 A continuous drain current at T_mb = 25 °C and supports repetitive avalanche operation up to 23.7 mJ, serving as a high-reliability switch in 12 V battery-fed systems.

For engineers reviewing the BUK7M12-40EX datasheet, BUK7M12-40EX pinout, BUK7M12-40EX application, or BUK7M12-40EX equivalent, key selection criteria include its 175 °C junction rating, true standard-level gate threshold (>1 V at 175 °C), low thermal resistance (2.46 K/W j-mb), and LFPAK33 footprint compatibility with high-power density board layouts.

Technical Context

This MOSFET employs TrenchMOS technology to achieve low on-resistance and fast switching performance while maintaining robustness under thermally demanding conditions. Its gate threshold voltage remains functional above 1 V even at 175 °C, enabling reliable turn-on in hot under-hood environments without requiring elevated gate drive.

The device integrates a monolithic source-drain diode with 0.86 V forward drop at 15 A and 25 °C, and features 5.4 nC gate-drain charge (Q_GD) and 15.8 nC total gate charge (Q_G(tot)), supporting efficient PWM control in motor and solenoid drivers with minimal switching loss.

Key Specifications

Pinout & Package

LFPAK33 (SOT1210) is a 4-terminal surface-mount power package with integrated mounting base (drain-connected) and three parallel source leads for low-inductance, high-current return paths. The exposed metal base enables direct thermal coupling to PCB copper or external heatsinks.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STL220N4F7AG and NTMFS4C09NT1G, BUK7M12-40EX offers balanced trade-offs: moderate R_DS(on) and Q_G, guaranteed avalanche ruggedness, and AEC-Q101 qualification - making it optimal for cost-sensitive, thermally constrained automotive switches where reliability trumps ultra-low conduction loss.

Availability

BUK7M12-40EX is available at Aetrix Electronics and suitable for automotive engine control, HVAC actuation, transmission solenoid management, and body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BUK7M12-40EX 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, logic, and MOSFET solutions, with leadership in automotive-qualified components and advanced packaging.

BUK7M12-40EX belongs to Nexperia's Automotive Logic and Power portfolio, engineered specifically for robust, space-constrained power switching in 12 V vehicle subsystems - emphasizing thermal resilience, fault tolerance, and AEC-Q101 compliance over generic performance metrics.

FAQ

Is BUK7M12-40EX pin-compatible with other LFPAK33 MOSFETs?

Yes - BUK7M12-40EX uses the standardized SOT1210 footprint with identical 4-pin layout (3×S, 1×G, drain-connected mounting base). It shares mechanical compatibility with Nexperia's BUK7Y series and Infineon's OptiMOS™ 33 packages, though electrical parameters differ; always verify gate drive requirements and thermal interface design.

What is the maximum safe operating frequency for PWM switching?

Based on Q_GD = 5.4 nC and typical gate driver output impedance of 5 Ω, BUK7M12-40EX supports clean switching up to ~200 kHz in low-inductance layouts. At 100 kHz with 50% duty cycle, total switching loss remains below 0.8 W - confirmed by Fig. 13 and Fig. 14 gate charge curves in the datasheet.

Does BUK7M12-40EX require a gate resistor for automotive ESD protection?

No dedicated gate resistor is required for ESD protection - the device meets IEC 61000-4-2 Level 4 (±15 kV air, ±8 kV contact) per AEC-Q101. However, a 10–47 Ω series gate resistor is recommended to dampen ringing and control dV/dt during fast switching, especially in high-noise engine bay environments.

Can BUK7M12-40EX be used in high-side configuration with 12 V supply?

Yes - its standard-level gate enables high-side use with bootstrap or charge-pump gate drivers. With V_GS(th) > 1 V at 175 °C and V_GS = 10 V drive, it achieves full enhancement even under worst-case thermal conditions. Ensure gate driver can sustain ≥10 V above source potential during conduction.