Nexperia USA Inc. BUK9M6R0-40HX

Overview

BUK9M6R0-40HX from Nexperia is an AEC-Q101 qualified N-channel logic-level MOSFET in LFPAK33 (SOT1210) package, rated for 40 V V_DS, 6.0 mΩ R_DS(on) at V_GS = 10 V and T_j = 25 °C, and 50 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 body electronics and DC-DC converters.

For engineers reviewing the BUK9M6R0-40HX datasheet, BUK9M6R0-40HX pinout, BUK9M6R0-40HX application, or BUK9M6R0-40HX equivalent, key selection criteria include its 4.5 V logic-level gate drive compatibility, repetitive avalanche rating, 175 °C junction temperature capability, and gull-wing lead configuration optimized for AOI inspection and thermal performance in 12 V automotive systems.

Technical Context

This MOSFET uses Trench 9 TrenchMOS technology to achieve low R_DS(on) and high power density while maintaining fast switching with Q_GD = 2.9–5.8 nC and C_iss = 1764–2470 pF. Its LFPAK33 package integrates a thermally enhanced mounting base directly connected to the drain, delivering R_th(j-mb) = 1.91–2.14 K/W for efficient heat transfer to the PCB.

The device features a gate-source threshold voltage of 1.45–2.15 V at 25 °C and remains functional down to 0.7 V at 175 °C, enabling reliable turn-on with standard 3.3 V or 5 V microcontroller outputs. Its source-drain diode exhibits soft recovery (S = 0.65) and 17 nC recovered charge, supporting inductive load commutation in motor drives without excessive voltage overshoot.

Key Specifications

Pinout & Package

LFPAK33 (SOT1210) is a plastic surface-mount package with 8 gull-wing leads and a large exposed copper mounting base. The package provides low-inductance, high-current paths and superior thermal performance versus SO-8 or DPAK, with footprint dimensions of 3.20 mm × 2.45 mm and 0.65 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BUK9M6R0-40HX, the Infineon part trades automotive qualification and thermal superiority for higher voltage headroom, while the ON Semiconductor part offers marginally lower R_DS(on) but lacks repetitive avalanche capability-making BUK9M6R0-40HX optimal for thermally dense, safety-critical 12 V automotive switches where ruggedness and manufacturability are paramount.

Availability

BUK9M6R0-40HX is available at Aetrix Electronics and suitable for automotive body control, 12 V DC-DC conversion, and LED lighting applications requiring stable component supply, long-term lifecycle support, and AEC-Q101 compliance.

Supply support for BUK9M6R0-40HX 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 and ESD protection.

BUK9M6R0-40HX belongs to Nexperia's LFPAK automotive MOSFET product line, engineered specifically for space-constrained, thermally demanding 12 V automotive subsystems where logic-level drive, avalanche ruggedness, and AOI-compatible packaging are essential.

FAQ

Is BUK9M6R0-40HX pin-compatible with standard SO-8 or DPAK MOSFETs?

No. BUK9M6R0-40HX uses the LFPAK33 (SOT1210) package with 8 gull-wing leads and an exposed drain-connected mounting base. Its footprint differs significantly from SO-8 or DPAK-requiring dedicated PCB layout per Figure 18 in the datasheet. The three-source-pin configuration also mandates updated routing for low-inductance source connections.

What is the maximum continuous drain current under real-world PCB conditions?

The datasheet specifies 50 A at T_mb = 25 °C with ideal heatsinking. In typical 2-layer automotive PCBs with 1 oz copper and 200 mm² thermal pad, sustained current is limited to ~25–30 A due to mounting base temperature rise. Derating curves in Figure 2 show 35 A at T_mb = 70 °C and 20 A at T_mb = 100 °C.

Does BUK9M6R0-40HX require a gate resistor for driving with a 3.3 V microcontroller?

No external gate resistor is required for basic turn-on, as V_GS(th) is as low as 0.7 V at 175 °C and typical turn-on occurs at ~1.5 V. However, a 5–10 Ω series resistor is recommended to damp ringing and limit peak gate current during fast switching, especially in half-bridge configurations where shoot-through risk exists.

How does the repetitive avalanche rating impact system design?

The repetitive avalanche capability eliminates the need for external clamping components (e.g., TVS diodes or RCD snubbers) in inductive load circuits like solenoids or relay drivers. It allows safe operation during frequent unclamped inductive turn-off events-reducing BOM count, PCB area, and validation effort while maintaining functional safety compliance in ASIL-B systems.