Nexperia USA Inc. BUK9Y3R0-40E/DMANX

Overview

BUK9Y3R0-40E from Nexperia is an AEC-Q101-qualified N-channel logic-level MOSFET in LFPAK56 (SOT669) package, rated for 40 V V_DS, 3.0 mΩ R_DS(on) at V_GS = 5 V and T_j = 25 °C, and 175 °C junction operation. It delivers 100 A continuous drain current at T_mb = 25 °C and supports ultra-high-performance power switching in automotive 12 V systems.

For engineers reviewing the BUK9Y3R0-40E datasheet, BUK9Y3R0-40E pinout, BUK9Y3R0-40E application, or BUK9Y3R0-40E equivalent, key selection criteria include its true logic-level gate (V_GS(th) > 0.5 V at 175 °C), repetitive avalanche rating, 0.77 K/W R_th(j-mb), and LFPAK56 thermal performance in thermally demanding environments.

Technical Context

This MOSFET employs TrenchMOS technology to achieve low on-resistance and fast switching with Q_GD = 10.7 nC and t_f = 34 ns under standard test conditions (V_DS = 30 V, R_L = 1.2 Ω, R_G(ext) = 5 Ω). Its gate threshold remains functional up to 175 °C, enabling robust operation in engine bay and transmission control locations.

The device integrates a source-drain diode with V_SD = 0.81 V at I_S = 25 A and T_j = 25 °C, and supports unclamped single-pulse avalanche energy of 193.8 mJ at I_D = 100 A. Mounting base thermal path enables direct PCB copper thermal coupling for high-power density designs.

Key Specifications

Pinout & Package

LFPAK56 (SOT669) is a 4-lead plastic surface-mount package with exposed mounting base connected to drain, optimized for high-current, low-inductance, and high-thermal-conductivity PCB layouts. The package features three parallel source terminals and one gate terminal, enabling low parasitic inductance and efficient heat transfer via the drain-connected metal base.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STL220N4F7AG and IRL1404ZPBF, the BUK9Y3R0-40E uniquely combines AEC-Q101 qualification, LFPAK56's low-inductance/low-R_th package, and guaranteed 0.5 V V_GS(th) at 175 °C-making it the only option qualified for safety-critical, thermally constrained automotive power switching.

Availability

BUK9Y3R0-40E is available at Aetrix Electronics and suitable for automotive transmission control, start-stop micro-hybrid systems, and LED headlamp power switching requiring stable component supply across extended production lifecycles.

Supply support for BUK9Y3R0-40E 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 MOSFETs and ESD protection solutions.

The BUK9Y series is part of Nexperia's automotive logic-level MOSFET product line, engineered specifically for high-current, high-temperature switching in 12 V automotive subsystems including engine management, ADAS actuators, and electrified chassis controls.

FAQ

Is BUK9Y3R0-40E suitable for 48 V mild-hybrid systems?

No. Its 40 V V_DS rating is insufficient for 48 V nominal systems, which experience transients exceeding 60 V per ISO 21848. This device is strictly intended for 12 V automotive architectures with load-dump immunity up to 40 V, as verified in its AEC-Q101 test plan and limiting values table.

What is the maximum recommended gate resistor for driving BUK9Y3R0-40E at 20 kHz PWM?

A 5 Ω external gate resistor is validated in the datasheet for switching characterization (t_f = 34 ns, t_r = 44 ns). For 20 kHz operation with minimal switching loss, 3.3–6.8 Ω is optimal; values below 2.2 Ω increase EMI risk without meaningful speed gain, while above 10 Ω causes excessive t_on/t_off and conduction loss penalties.

Does the mounting base require electrical isolation from the PCB ground plane?

Yes. The mounting base is internally connected to the drain terminal. If used in high-side configurations or floating applications, it must be electrically isolated using dielectric thermal pads or solder mask-defined keep-outs. In low-side configurations, it may be directly soldered to a drain-copper pour, but never to system ground unless drain is grounded.

Can BUK9Y3R0-40E replace BUK9Y8R2-40E in existing designs?

No. Although both share the LFPAK56 package and 40 V rating, BUK9Y8R2-40E has 8.2 mΩ R_DS(on) and lower gate charge. Substituting the 3.0 mΩ BUK9Y3R0-40E increases peak gate current demand and may cause overshoot/oscillation if the gate driver lacks sufficient current capability (≥2 A peak) and proper layout damping.