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

Nexperia USA Inc. BUK7J1R0-40HX

Name: BUK7J1R0-40HX
Brand: Nexperia USA Inc.
SKU: BUK7J1R0-40HX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK7J1R0-40HX

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: -

Datasheet:: BUK7J1R0-40HX.pdf

Description:: BUK7J1R0-40H/SOT1023/4 LEADS

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BUK7J1R0-40HX from Nexperia is an automotive-qualified N-channel MOSFET using Trench 9 superjunction technology in LFPAK56E (SOT1023) package, rated for 40 V V_DS, 1.0 mΩ R_DS(on) at 25 °C, 220 A continuous drain current, and 175 °C junction temperature - deployed in start-stop micro-hybrid transmission control and high-current lamp drivers.

For engineers reviewing the BUK7J1R0-40HX datasheet, BUK7J1R0-40HX pinout, BUK7J1R0-40HX application, or BUK7J1R0-40HX equivalent, this page delivers verified thermal resistance (0.21 K/W R_th(j-mb)), gate charge (90.7 nC Q_G(tot)), avalanche energy (242 mJ E_AS), and LFPAK56E mounting base connectivity - critical for high-reliability 12 V automotive power switching design.

Technical Context

This MOSFET employs Trench 9 superjunction architecture to achieve sub-1 mΩ on-resistance in a compact LFPAK56E footprint while maintaining robust SOA and unclamped avalanche capability (242 mJ). Its tight V_GS(th) range (2.4–3.6 V at 25 °C) enables stable parallel operation without current imbalance.

The LFPAK56E package integrates copper clip interconnects and gull-wing leads, delivering low R_th(j-mb) (0.21 K/W typ), enhanced board-level reliability under thermal cycling, and AOI-compatible solder joints - eliminating need for x-ray inspection in automotive production lines.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V - Maximum drain-source blocking voltage for 12 V automotive systems with transient margin.
R_DS(on)	0.85 mΩ typ @ V_GS = 10 V, I_D = 25 A, T_j = 25 °C - Enables ultra-low conduction loss in high-current motor/solenoid drivers.
I_D cont	220 A @ T_mb = 25 °C - Validated continuous current rating limited by PCB thermal design, not device intrinsic limit.
R_th(j-mb)	0.21 K/W typ - Junction-to-mounting-base thermal resistance enabling direct heatsink attachment and efficient power dissipation.
Q_G(tot)	90.7 nC typ - Total gate charge determining drive strength requirement and switching loss in PWM applications.
E_AS	242 mJ - Non-repetitive avalanche energy at T_j(init) = 25 °C - Supports robustness against inductive load turn-off transients.
V_GS(th)	3.0 V typ @ I_D = 1 mA - Tight threshold distribution (2.4–3.6 V) ensures predictable turn-on behavior across temperature and unit variation.

Pinout & Package

LFPAK56E (SOT1023) is a 4-lead surface-mount plastic package with exposed copper mounting base connected to drain, optimized for high-current automotive power stages. It features gull-wing leads for mechanical stress absorption and visual solder inspection.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3	Source (S)	Three parallel source terminals reduce package inductance and improve current sharing in high-di/dt switching.
4	Gate (G)	Single gate input with 1.17 Ω typical gate resistance - balances switching speed and EMI control in 12 V systems.
Mounting Base	Drain (D)	Exposed copper pad electrically and thermally connected to drain - serves as primary heat path and high-current return path.

Key Features

Feature	Design Value
AEC-Q101 qualified	Fully qualified for automotive use with 175 °C max junction temperature - supports under-hood deployment in transmission and engine control modules.
Trench 9 superjunction	Reduces cell pitch to lower R_DS(on) by ~25% vs prior TrenchMOS, improving power density without increasing footprint.
LFPAK copper clip	Reduces R_DS(on) and R_th(j-mb) vs wire-bonded QFN - increases current capability and improves current spreading uniformity.
Gull-wing leads	Enables AOI-compatible solder joint inspection and superior mechanical reliability during thermal cycling vs flat-bottom QFN packages.

Applications

Start-Stop Micro-Hybrid Control

Transmission Solenoid Driver

Use Scenario: High-duty-cycle switching of starter motor engagement and battery regeneration during engine restart.

IC Role / Device Role / Timing Role: Main power switch controlling bidirectional energy flow between 12 V battery and starter-generator.

Use Value: 220 A continuous current and 242 mJ avalanche energy ensure reliable operation during repeated cranking pulses with minimal thermal derating.

Use Scenario: Precise PWM control of hydraulic solenoids in automatic transmission valve bodies.

IC Role / Device Role / Timing Role: Low-loss, fast-switching high-side or low-side driver handling 30–100 A peak currents at 1–10 kHz.

Use Value: 0.85 mΩ R_DS(on) minimizes I²R heating during sustained duty cycles; tight V_GS(th) enables consistent turn-on timing across units.

Lamp Load Switching

12 V DC Motor Driver

Use Scenario: On/off and dimming control of LED headlamps, fog lamps, and interior lighting in body control modules.

IC Role / Device Role / Timing Role: High-current, low-R_DS(on) switch replacing electromechanical relays for improved lifetime and noise immunity.

Use Value: Gull-wing leads and copper clip construction withstand vibration and thermal cycling in lamp housings; 175 °C rating accommodates enclosed thermal environments.

Use Scenario: Full-bridge or half-bridge driving of HVAC blower motors, power seat actuators, and window lifters.

IC Role / Device Role / Timing Role: High-efficiency power stage switch with fast turn-on/turn-off (22 ns td(on), 24 ns tf) for reduced switching losses.

Use Value: 90.7 nC Q_G(tot) and 17.7 nC Q_GD support clean, low-overshoot switching at 20–50 kHz PWM frequencies in motor control ICs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STL220N4F7AG	40 V, 0.75 mΩ R_DS(on), PowerFLAT 5x6 package, 150 °C T_j max - lower R_DS(on) but no AEC-Q101 qualification stated in public datasheet.	Not automotive-qualified per AEC-Q101 - suitable for industrial motor drives but requires additional validation for OEM automotive use.	Select only if AEC-Q101 compliance is not required and lower on-resistance is prioritized over qualification traceability.
ON Semiconductor NTMFS4C09NT1G	40 V, 0.95 mΩ R_DS(on), SO-8FL package, AEC-Q101 qualified, 175 °C T_j - similar performance but higher R_th(j-mb) (0.45 K/W) limits thermal performance in high-power layouts.	Higher thermal resistance reduces usable current in constrained PCB heatsinking - less effective in transmission solenoid applications with limited copper area.	Prefer when footprint compatibility with legacy SO-8FL designs is mandatory and thermal margin allows for derating.

Compared with STL220N4F7AG and NTMFS4C09NT1G, BUK7J1R0-40HX uniquely combines AEC-Q101 qualification, 0.21 K/W R_th(j-mb), and triple-source-pin layout - delivering superior thermal management and system-level reliability in space-constrained, high-current automotive power stages.

Availability

BUK7J1R0-40HX is available at Aetrix Electronics and suitable for start-stop micro-hybrid control, transmission solenoid actuation, and 12 V lamp switching requiring stable component supply across automotive production lifecycles.

Supply support for BUK7J1R0-40HX 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 efficiency technologies - delivering high-performance, high-reliability discrete and logic devices for automotive, industrial, and consumer markets.

BUK7J1R0-40HX belongs to Nexperia's Automotive Logic and Power portfolio, engineered specifically for high-current, thermally demanding 12 V automotive subsystems where AEC-Q101 compliance, low R_DS(on), and robust thermal performance are non-negotiable.

FAQ

What is the maximum continuous drain current for BUK7J1R0-40HX?

The BUK7J1R0-40HX is rated for 220 A continuous drain current at T_mb = 25 °C, as validated in application testing. Real-world current capability depends on PCB copper area, heatsinking, and ambient temperature - the device itself supports up to 175 °C junction temperature and 500 W total power dissipation.

Does BUK7J1R0-40HX require a gate resistor for automotive PWM operation?

Yes - a series gate resistor (typically 2.2–10 Ω) is recommended to control dV/dt and prevent parasitic oscillation during fast switching. The device's 1.17 Ω typical gate resistance and 90.7 nC total gate charge define the minimum drive strength needed; insufficient gate drive causes increased switching losses and thermal stress.

How is the mounting base connected internally in the LFPAK56E package?

The mounting base in the LFPAK56E package is electrically and thermally connected directly to the drain terminal. This dual-purpose copper pad serves as both the primary heat dissipation path (R_th(j-mb) = 0.21 K/W) and the high-current drain return path - requiring careful PCB layout with solid thermal vias and adequate copper pour.

Can BUK7J1R0-40HX replace older MOSFETs like BUK9Y1R0-40E in existing designs?

Yes - BUK7J1R0-40HX is a direct drop-in replacement for BUK9Y1R0-40E in LFPAK56E footprints, offering identical pinout, improved R_DS(on) (0.85 mΩ vs 1.0 mΩ), and enhanced avalanche ruggedness (242 mJ vs 190 mJ). No layout changes are required, but gate drive optimization may yield further efficiency gains.

BUK7J1R0-40HX 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):: +20V, -10V

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

FET Feature:: -

Power Dissipation (Max):: -

Operating Temperature:: -

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: -

Supplier Device Package:: -

BUK7J1R0-40HX FAQ

1.How can I place an order for BUK7J1R0-40HX through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK7J1R0-40HX 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 BUK7J1R0-40HX reliable?

The price and inventory of BUK7J1R0-40HX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK7J1R0-40HX is usually 5 days.

3.What payment methods are accepted for BUK7J1R0-40HX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK7J1R0-40HX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK7J1R0-40HX?

BUK7J1R0-40HX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK7J1R0-40HX 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 BUK7J1R0-40HX?

For technical support, including BUK7J1R0-40HX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK7J1R0-40HX requirements.

6.How does Aetrix verify that BUK7J1R0-40HX is sourced from the original manufacturer or authorized distributors?

All BUK7J1R0-40HX 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 BUK7J1R0-40HX meets industry standards.

7.What is the process for return or replacement of BUK7J1R0-40HX?

All BUK7J1R0-40HX units undergo pre-shipment inspection (PSI). If there is an issue with BUK7J1R0-40HX, 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 BUK7J1R0-40HX part is unused and in its original packaging.

Return procedure for BUK7J1R0-40HX:

1.Submit a request within 90 days.

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

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