Nexperia USA Inc. BUK964R4-40B,118

Overview

BUK964R4-40B,118 from Nexperia is an AEC-Q101 qualified logic-level N-channel TrenchMOS FET in D2PAK (SOT404) package, designed for automotive-critical 12 V power switching. It delivers 75 A continuous drain current at 5 V gate drive, features 3.9 mΩ R_DS(on) at V_GS = 5 V and T_j = 25 °C, supports 175 °C junction operation, and withstands 961 mJ unclamped avalanche energy - enabling robust control of motors, lamps, and solenoids in engine bays and body electronics.

For engineers reviewing the BUK964R4-40B,118 datasheet, BUK964R4-40B,118 pinout, BUK964R4-40B,118 application, or BUK964R4-40B,118 equivalent, key selection criteria include logic-level gate compatibility with 5 V microcontrollers, thermal performance under mounting-base-limited conduction (R_th(j-mb) = 0.59 K/W), SOA compliance up to 75 A/40 V, and automotive qualification for safety-critical load switching.

Technical Context

This device implements a trench-gate MOSFET structure optimized for low R_DS(on) and high avalanche ruggedness. Its gate threshold voltage (V_GS(th)) ranges from 0.5 V at 175 °C to 2.3 V at −55 °C, ensuring reliable turn-on across automotive temperature extremes while maintaining sub-1 µA IDSS leakage at 25 °C and 40 V V_DS.

Dynamic behavior is characterized by 64 nC total gate charge (Q_G(tot)) and 24 nC gate-drain charge (Q_GD) at V_GS = 5 V, supporting fast switching with 44 ns turn-on delay and 132 ns fall time. The integrated source-drain diode exhibits 0.85 V forward drop at 25 A and 70 ns reverse recovery time, suitable for freewheeling in inductive loads.

Key Specifications

Pinout & Package

Package: D2PAK (SOT404), plastic single-ended surface-mounted package with exposed mounting base connected to drain. Dimensions per IEC JEDEC outline: 15.8 × 10.3 × 4.5 mm (L × W × H), 3 leads (lead 2 cropped).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STL220N4F7AG and IRF1404ZLPBF, BUK964R4-40B,118 uniquely combines AEC-Q101 qualification, true 5 V logic-level operation, D2PAK thermal efficiency, and 175 °C capability - making it the only viable choice for safety-critical, thermally constrained automotive power switching.

Availability

BUK964R4-40B,118 is available at Aetrix Electronics and suitable for automotive engine control, body electronics, and start-stop system designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for Tier-1 production programs.

Supply support for BUK964R4-40B,118 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 specializing in high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging technologies.

This part belongs to Nexperia's TrenchMOS automotive logic-level power MOSFET product line, engineered specifically for replacing mechanical relays and discrete transistors in 12 V automotive power distribution systems with enhanced efficiency, reliability, and integration.

FAQ

Is BUK964R4-40B,118 suitable for high-frequency PWM motor control?

Yes - with 44 ns turn-on delay, 132 ns fall time, and 64 nC total gate charge, it supports PWM frequencies up to 100 kHz in motor drive half-bridges. Its 24 nC gate-drain charge minimizes Miller-induced shoot-through risk, and the 0.59 K/W junction-to-mounting-base thermal resistance ensures stable operation at 20–50 kHz switching with proper PCB copper area.

What is the maximum continuous drain current at 100 °C mounting base temperature?

Per Figure 1 in the datasheet, the continuous drain current is derated to 75 A at T_mb = 100 °C with V_GS = 5 V. This limit is package-constrained, not silicon-limited - the die itself supports higher current, but thermal saturation in the D2PAK leadframe caps conduction at 75 A regardless of junction temperature.

Does the mounting base require electrical isolation from the PCB?

No - the mounting base is internally connected to the drain terminal (pin 2). It must be soldered directly to a large copper pour or heatsink that is electrically tied to the drain net. Isolation would impede both thermal dissipation and circuit functionality, as the base serves as the primary current and heat path.

Can BUK964R4-40B,118 replace a mechanical relay in automotive lighting circuits?

Yes - its 75 A continuous rating, 961 mJ avalanche energy, and 175 °C operation make it ideal for headlamp, fog lamp, and daytime running light control. Unlike relays, it offers silent operation, infinite cycle life, and precise PWM dimming without contact wear or bounce, while meeting ISO 7637-2 pulse immunity requirements when properly protected.