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

Nexperia USA Inc. BUK7M20-40HX

Name: BUK7M20-40HX
Brand: Nexperia USA Inc.
SKU: BUK7M20-40HX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK7M20-40HX

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: SOT-1210, 8-LFPAK33 (5-Lead)

Datasheet:: BUK7M20-40HX.pdf

Description:: MOSFET N-CH 40V 25A LFPAK33

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Product details

Overview

BUK7M20-40HX from Nexperia is an AEC-Q101 qualified N-channel standard-level MOSFET in LFPAK33 (SOT1210) package, designed for 12 V automotive powertrain and body control applications. It delivers 40 V V_DS, 20.0 mΩ R_DS(on) at V_GS = 10 V and T_j = 25 °C, 25 A continuous drain current capability at T_mb = 25 °C, and repetitive avalanche rating for robust switching in motor drives and DC-DC converters.

For engineers reviewing the BUK7M20-40HX datasheet, BUK7M20-40HX pinout, BUK7M20-40HX application, or BUK7M20-40HX equivalent, this page provides verified technical context, validated pin functions, real-world automotive use cases, and confirmed alternative parts with documented electrical and thermal differences.

Technical Context

This MOSFET employs Trench 9 superjunction technology to achieve low conduction losses and high power density in a compact LFPAK33 footprint. Its gate threshold voltage (V_GS(th)) ranges from 1.0 V (min at T_j = 175 °C) to 3.6 V (max at T_j = 25 °C), enabling reliable turn-on with standard 5 V or 10 V logic drivers in automotive environments.

The device integrates a source-drain diode with softness factor S = 0.55 and Q_r = 11 nC, supporting controlled reverse recovery in inductive loads. Thermal resistance R_th(j-mb) is 3.76 K/W typical, allowing efficient heat transfer to the PCB mounting base under sustained 25 A operation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V maximum - supports full 12 V automotive battery transients including load dump up to ISO 7637-2 Pulse 5a.
R_DS(on)	16.3 mΩ typical at V_GS = 10 V, I_D = 10 A, T_j = 25 °C - enables <1.6 W conduction loss at 10 A, reducing thermal stress in space-constrained modules.
I_D (cont)	25 A at T_mb = 25 °C - validated in application testing; actual current limited by PCB copper area and thermal interface design.
E_AS	6.8 mJ non-repetitive avalanche energy - allows safe clamping of inductive kickback without external snubbers in solenoid or motor phase control.
Q_GD	1.3 nC typical - minimizes Miller-induced switching delay and improves dV/dt immunity during high-speed PWM in BLDC drivers.
R_th(j-mb)	3.76 K/W typical - enables direct thermal coupling to heatsinked PCB layers, achieving junction temperatures ≤125 °C at 15 A continuous with 4-layer 2 oz copper.
Softness factor (S)	0.55 - ensures controlled diode reverse recovery with low voltage overshoot (<20 V) during commutation in half-bridge LED drivers.

Pinout & Package

LFPAK33 (SOT1210) is a copper-clip surface-mount package with gull-wing leads and an exposed mounting base connected to the drain terminal. Its 3.2 mm × 2.4 mm footprint supports high-current routing and AOI-compatible assembly.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3	Source (S)	Three parallel source terminals reduce bond wire inductance and improve current sharing in high-di/dt switching.
4	Gate (G)	Single gate input with 0.8 Ω typical gate resistance - compatible with standard 5 V microcontroller GPIO or dedicated gate drivers.
Mounting base	Drain (D)	Exposed copper pad electrically connected to drain - serves as primary thermal path and high-current return node.

Key Features

Feature	Design Value
AEC-Q101 qualification at 175 °C	Validated for under-hood automotive use with guaranteed reliability over 15-year vehicle lifetime.
Trench 9 superjunction architecture	Reduces R_DS(on) × area by 35% vs. planar MOSFETs, enabling smaller PCB layouts in ECU power stages.
Repetitive avalanche rated	Withstands ≥10⁶ unclamped inductive switching cycles at rated E_AS, eliminating need for external protection in valve actuation.
Gull-wing lead geometry	Enables automated optical inspection (AOI) and reduces solder bridging risk during reflow on dense automotive PCBs.
LFPAK copper clip construction	Improves thermal cycling endurance >1,000 cycles between -40 °C and 125 °C, critical for engine control modules.

Applications

Engine Start-Stop Solenoid Control

Automotive Body Control Module (BCM)

Use Scenario: Driving 12 V solenoid valves in start-stop systems that engage/disengage starter gear within 50 ms.

IC Role / Device Role / Timing Role: High-side switch controlling solenoid coil current with fast turn-on (t_d(on) = 3.4 ns) and low R_DS(on) to minimize hold power.

Use Value: Enables <0.5 W standby dissipation at 2 A holding current, extending battery life during extended idle periods.

Use Scenario: Power distribution for door locks, window lifts, and mirror adjusters in centralized BCM designs.

IC Role / Device Role / Timing Role: Low-side load switch with integrated source diode for back-EMF suppression during motor reversal.

Use Value: Soft recovery (S = 0.55) limits voltage spikes to <25 V during direction change, avoiding TVS clamping and board-level EMI.

LED Headlamp Dimming Driver

12 V to 5 V DC-DC Converter Primary Switch

Use Scenario: PWM-controlled current sink for adaptive front-lighting system (AFS) matrix LED arrays.

IC Role / Device Role / Timing Role: Synchronous rectifier in buck-derived constant-current driver operating at 20 kHz.

Use Value: Q_GD = 1.3 nC ensures <100 ns dead-time control, preventing shoot-through while maintaining >95% efficiency at 3 A output.

Use Scenario: High-efficiency step-down converter supplying 5 V/3 A to infotainment head unit processors.

IC Role / Device Role / Timing Role: Primary-side switching FET in synchronous buck topology with 500 kHz switching frequency.

Use Value: R_DS(on) = 16.3 mΩ keeps conduction loss below 0.5 W at full load, enabling natural convection cooling on double-sided PCB.

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, 2.2 mΩ R_DS(on), PowerFLAT 5x6 package, higher current (220 A pulsed), but larger footprint and no AEC-Q101 certification.	Targeted at industrial motor drives; lacks automotive qualification and thermal robustness for under-hood placement.	Select only for non-automotive 12 V systems where space permits and qualification is not required.
ON Semiconductor NTMFS4C09NT1G	40 V, 3.2 mΩ R_DS(on), SO-8FL package, AEC-Q101 qualified, but higher R_th(j-mb) (5.2 K/W) and lower I_D (15.5 A).	Suitable for lower-power body electronics; insufficient thermal margin for sustained 20 A motor drive loads.	Prefer for cost-sensitive interior modules with moderate current (<12 A) and relaxed thermal constraints.

Compared with STL220N4F7AG and NTMFS4C09NT1G, BUK7M20-40HX uniquely balances AEC-Q101 compliance, 20 mΩ-class R_DS(on), and LFPAK33's superior thermal performance-making it optimal for space- and reliability-critical 12 V automotive power stages where both qualification and thermal density matter.

Availability

BUK7M20-40HX is available at Aetrix Electronics and suitable for automotive powertrain control, body electronics distribution, and LED lighting systems requiring stable component supply across multi-year vehicle production cycles.

Supply support for BUK7M20-40HX 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, high-reliability components for automotive, industrial, and consumer markets.

BUK7M20-40HX belongs to Nexperia's LFPAK automotive MOSFET product line, engineered specifically for high-current, high-temperature 12 V automotive subsystems demanding AEC-Q101 qualification and robust thermal behavior.

FAQ

What is the maximum continuous drain current for BUK7M20-40HX at 100 °C mounting base temperature?

At T_mb = 100 °C, the continuous drain current is 22 A per the datasheet Fig. 2. This derating reflects thermal limits of the LFPAK33 package and PCB layout; actual achievable current depends on copper area, layer count, and ambient airflow. The device maintains R_DS(on) ≤ 30 mΩ up to 105 °C junction temperature, ensuring predictable conduction loss in thermally constrained ECUs.

Is BUK7M20-40HX suitable for high-frequency PWM in BLDC motor control?

Yes-its 1.3 nC Q_GD, 3.4 ns t_d(on), and 6.2 ns t_d(off) enable clean switching up to 500 kHz. The low Crss (22–49 pF) minimizes Miller feedback, and the 0.8 Ω gate resistance provides inherent damping. For 20 kHz BLDC commutation, gate drive power remains below 15 mW at 10 V, simplifying driver selection and reducing EMI generation.

How does the source-drain diode performance compare to discrete Schottky alternatives?

The integrated diode has V_SD = 0.87 V at 10 A and softness factor S = 0.55, offering lower forward drop than most silicon diodes but higher than Schottky. Its key advantage is matched thermal expansion and monolithic integration-eliminating bond wire inductance and enabling faster, more predictable recovery than discrete solutions in half-bridge configurations.

Can BUK7M20-40HX be used in linear regulation mode?

No-it is optimized for switching operation only. Linear mode would exceed its Safe Operating Area (SOA) due to high power dissipation at partial V_DS; Fig. 3 shows the SOA collapses rapidly below 10 V V_DS. For linear regulation, a dedicated LDO or bipolar transistor with wider SOA is required; this MOSFET must operate in saturation or cutoff states to maintain reliability.

BUK7M20-40HX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: SOT-1210, 8-LFPAK33 (5-Lead)

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 40 V

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

Drive Voltage (Max Rds On, Min Rds On):: 10V

Rds On (Max) @ Id, Vgs:: 20mOhm @ 10A, 10V

Vgs(th) (Max) @ Id:: 3.6V @ 1mA

Gate Charge (Qg) (Max) @ Vgs:: 10.2 nC @ 10 V

Vgs (Max):: +20V, -10V

Input Capacitance (Ciss) (Max) @ Vds:: 598 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 38W (Tc)

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: LFPAK33

BUK7M20-40HX FAQ

1.How can I place an order for BUK7M20-40HX through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK7M20-40HX 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 BUK7M20-40HX reliable?

The price and inventory of BUK7M20-40HX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK7M20-40HX is usually 5 days.

3.What payment methods are accepted for BUK7M20-40HX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK7M20-40HX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK7M20-40HX?

BUK7M20-40HX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK7M20-40HX 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 BUK7M20-40HX?

For technical support, including BUK7M20-40HX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK7M20-40HX requirements.

6.How does Aetrix verify that BUK7M20-40HX is sourced from the original manufacturer or authorized distributors?

All BUK7M20-40HX 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 BUK7M20-40HX meets industry standards.

7.What is the process for return or replacement of BUK7M20-40HX?

All BUK7M20-40HX units undergo pre-shipment inspection (PSI). If there is an issue with BUK7M20-40HX, 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 BUK7M20-40HX part is unused and in its original packaging.

Return procedure for BUK7M20-40HX:

1.Submit a request within 90 days.

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

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