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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FETs, MOSFETs

Nexperia USA Inc. BUK9J0R9-40HX

Name: BUK9J0R9-40HX
Brand: Nexperia USA Inc.
SKU: BUK9J0R9-40HX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK9J0R9-40HX

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: -

Datasheet:: BUK9J0R9-40HX.pdf

Description:: BUK9J0R9-40H/SOT1023/4 LEADS

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BUK9J0R9-40HX from Nexperia is an automotive-qualified N-channel logic-level MOSFET using Trench 9 superjunction technology, rated for 40 V V_DS, 0.9 mΩ R_DS(on) at V_GS = 10 V and T_j = 25 °C, and housed in the enhanced LFPAK56E (SOT1023) package. It delivers 220 A continuous drain current at T_mb = 25 °C and supports ultra-high-performance power switching in thermally demanding 12 V automotive systems.

For engineers reviewing the BUK9J0R9-40HX datasheet, BUK9J0R9-40HX pinout, BUK9J0R9-40HX application, or BUK9J0R9-40HX equivalent, key selection criteria include its AEC-Q101 qualification, 175 °C junction rating, low R_DS(on) with tight V_GS(th) distribution, high avalanche energy (290 mJ), and LFPAK56E's copper-clip thermal performance.

Technical Context

This MOSFET employs Trench 9 superjunction architecture to achieve reduced cell pitch, enabling higher power density and lower R_DS(on) within the same LFPAK56E footprint versus prior-generation TrenchMOS. Its optimized gate charge profile (Q_G(tot) = 76 nC typ, Q_GD = 25.3 nC max) supports fast, efficient switching in high-current DC-DC and motor control stages.

The LFPAK56E package integrates a copper clip connecting the die drain directly to the exposed mounting base (mb), yielding R_th(j-mb) = 0.21 K/W typical and enabling high-current capability without solder joint reliability concerns. Gull-wing leads support AOI inspection and robust thermal cycling endurance per AEC-Q101.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V - Maximum drain-source blocking voltage compatible with 12 V automotive battery systems including load dump transients.
R_DS(on)	0.94 mΩ max at V_GS = 10 V, I_D = 25 A, T_j = 25 °C - Enables <1 W conduction loss at 100 A, critical for high-efficiency solenoid/motor drivers.
I_D (cont)	220 A at T_mb = 25 °C - Validated continuous current capacity, limited in practice by PCB copper area and thermal interface design.
E_AS	290 mJ - Non-repetitive avalanche energy at I_D = 160 A, defining ruggedness margin during inductive turn-off events in transmission control.
R_th(j-mb)	0.21 K/W typical - Junction-to-mounting-base thermal resistance enables direct heatsinking and >500 W power dissipation capability.
V_GS(th)	1.35–2.05 V - Tight threshold range ensures predictable turn-on behavior and stable paralleling of multiple devices.
Q_GD	25.3 nC max - Gate-drain charge directly impacts switching loss and dV/dt immunity in high-side configurations.

Pinout & Package

LFPAK56E (SOT1023) is a 4-lead, single-ended surface-mount package featuring an exposed copper mounting base connected to the drain, gull-wing source/gate leads, and copper-clip die attachment for low-inductance, high-current routing.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3	Source (S)	Three parallel gull-wing leads provide low-inductance, high-current return path and mechanical stability under thermal cycling.
4	Gate (G)	Single gull-wing lead for low-impedance gate drive; layout must minimize loop inductance to suppress oscillation during fast switching.
Mounting Base (mb)	Drain (D)	Exposed copper pad electrically and thermally connected to drain; requires full-solder coverage for optimal R_DS(on) and thermal performance.

Key Features

Feature	Design Value
AEC-Q101 qualified	Full qualification to automotive stress test standard, including 175 °C operating temperature and extended lifetime testing.
Trench 9 superjunction	Enables 0.9 mΩ R_DS(on) in LFPAK56E footprint-25% lower than comparable TrenchMOS-improving efficiency in start-stop micro-hybrid systems.
LFPAK copper clip	Reduces R_th(j-mb) by ~30% vs. wire-bonded QFN, increasing maximum current capability and improving current spreading uniformity.
Tight V_GS(th) limits	1.35–2.05 V range allows reliable paralleling of up to four devices without current imbalance or thermal runaway.
Gull-wing leads	Enable automated optical inspection (AOI) without x-ray, reduce solder voiding risk, and absorb mechanical stress during thermal cycling.

Applications

12 V Automotive Power Distribution

Motors & Solenoids Control

Use Scenario: High-side switching in body control modules (BCM) for headlamp, HVAC blower, and seat actuator loads.

IC Role / Device Role / Timing Role: Primary power switch handling 50–150 A peak currents with fast turn-on (<50 ns td(on)) and low conduction loss.

Use Value: 0.9 mΩ R_DS(on) reduces heat generation by >40% vs. legacy 1.5 mΩ MOSFETs, eliminating need for additional heatsinking in space-constrained BCMs.

Use Scenario: PWM-driven fuel injector or transmission solenoid driver in engine control units (ECU).

IC Role / Device Role / Timing Role: Low-loss, high-speed switching element with controlled dI/dt to prevent EMI and ensure precise pulse-width modulation.

Use Value: Soft reverse recovery (S = 0.77) and low Q_r (52.6 nC) minimize voltage overshoot and diode switching losses during inductive flyback.

Start-Stop Micro-Hybrid Systems

Transmission Control Units

Use Scenario: Starter motor engagement/disengagement and regenerative braking energy routing in 12 V stop-start architectures.

IC Role / Device Role / Timing Role: Bidirectional power switch managing high-current pulses (up to 600 A peak) with robust avalanche capability.

Use Value: 290 mJ non-repetitive avalanche energy withstands repeated inductive energy dumps during cranking, extending system lifetime beyond 100,000 cycles.

Use Scenario: Clutch and gear-shift solenoid actuation in automatic and dual-clutch transmissions (DCT).

IC Role / Device Role / Timing Role: High-reliability, high-current switch operating continuously at elevated ambient temperatures (up to 150 °C).

Use Value: 175 °C rated junction temperature and AEC-Q101 qualification ensure functional safety compliance and zero field failures over 15-year vehicle life.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Infineon BSC014N04LS6	R_DS(on) = 1.4 mΩ max (V_GS = 10 V); TO-263-3 package; no AEC-Q101 automotive qualification.	Limited to industrial-grade 12 V power supplies; unsuitable for safety-critical automotive functions requiring AEC-Q101.	Select only if automotive qualification is not required and board space permits larger TO-263 footprint.
ON Semiconductor NTMFS4C09NT1G	R_DS(on) = 0.95 mΩ max; SO-8FL package; AEC-Q101 qualified but R_th(j-mb) = 0.45 K/W (vs. 0.21 K/W).	Lower thermal performance limits continuous current to ~130 A at T_mb = 25 °C, reducing usable power density.	Choose when existing SO-8FL layout reuse is prioritized over thermal optimization and peak current capability.

Compared with BUK9J0R9-40HX, the Infineon part lacks automotive qualification and has higher R_DS(on), while the ON Semiconductor part matches qualification but sacrifices 50% thermal conductivity-making the BUK9J0R9-40HX optimal for high-power, thermally constrained automotive switching where both reliability and efficiency are critical.

Availability

BUK9J0R9-40HX is available at Aetrix Electronics and suitable for 12 V automotive power distribution, motors & solenoids control, and start-stop micro-hybrid systems requiring stable component supply, long-term lifecycle assurance, and AEC-Q101-compliant traceability.

Supply support for BUK9J0R9-40HX 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 essential semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer markets.

BUK9J0R9-40HX belongs to Nexperia's LFPAK automotive MOSFET product line, engineered specifically for high-current, high-reliability 12 V automotive power switching applications demanding AEC-Q101 qualification and superior thermal performance.

FAQ

What is the maximum continuous drain current for BUK9J0R9-40HX?

The BUK9J0R9-40HX is rated for 220 A continuous drain current at T_mb = 25 °C, validated in application testing. Practical current capability depends on PCB copper area, thermal interface material, heatsink design, and ambient temperature-designers should use Fig. 2 from the datasheet to derate based on actual mounting base temperature.

Does BUK9J0R9-40HX require a gate resistor for automotive applications?

Yes-a gate resistor (typically 2.2–10 Ω) is recommended to control dV/dt and prevent parasitic oscillation during fast switching. The device's low Q_GD (25.3 nC max) and 1.04 Ω typical gate resistance enable stable drive with standard gate drivers, but layout inductance must be minimized to avoid ringing.

How does the LFPAK56E package improve reliability over standard QFN?

The LFPAK56E replaces wire bonds with a copper clip connecting the die drain directly to the exposed mounting base, reducing thermal resistance by ~30% and eliminating bond-wire fatigue failure modes. Its gull-wing leads also absorb mechanical stress during thermal cycling, achieving >1,000 cycles at ΔT = 100 K-exceeding AEC-Q101 requirements.

Can BUK9J0R9-40HX be used in parallel configurations?

Yes-its tightly distributed V_GS(th) (1.35–2.05 V) and flat R_DS(on) vs. temperature curve enable stable current sharing across up to four paralleled devices without external balancing resistors, provided layout symmetry and thermal coupling are maintained.

BUK9J0R9-40HX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: -

Technology:: -

Drain to Source Voltage (Vdss):: -

Current - Continuous Drain (Id) @ 25°C:: 220A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: -

Rds On (Max) @ Id, Vgs:: -

Vgs(th) (Max) @ Id:: -

Gate Charge (Qg) (Max) @ Vgs:: -

Vgs (Max):: +16V, -10V

Input Capacitance (Ciss) (Max) @ Vds:: -

FET Feature:: -

Power Dissipation (Max):: -

Operating Temperature:: -

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: -

Supplier Device Package:: -

BUK9J0R9-40HX FAQ

1.How can I place an order for BUK9J0R9-40HX through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK9J0R9-40HX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BUK9J0R9-40HX reliable?

The price and inventory of BUK9J0R9-40HX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9J0R9-40HX is usually 5 days.

3.What payment methods are accepted for BUK9J0R9-40HX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK9J0R9-40HX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK9J0R9-40HX?

BUK9J0R9-40HX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK9J0R9-40HX order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BUK9J0R9-40HX?

For technical support, including BUK9J0R9-40HX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9J0R9-40HX requirements.

6.How does Aetrix verify that BUK9J0R9-40HX is sourced from the original manufacturer or authorized distributors?

All BUK9J0R9-40HX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BUK9J0R9-40HX meets industry standards.

7.What is the process for return or replacement of BUK9J0R9-40HX?

All BUK9J0R9-40HX units undergo pre-shipment inspection (PSI). If there is an issue with BUK9J0R9-40HX, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BUK9J0R9-40HX part is unused and in its original packaging.

Return procedure for BUK9J0R9-40HX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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