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

Nexperia USA Inc. BUK9M52-40EX

Name: BUK9M52-40EX
Brand: Nexperia USA Inc.
SKU: BUK9M52-40EX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK9M52-40EX

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

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

Datasheet:: BUK9M52-40EX.pdf

Description:: MOSFET N-CH 40V 17.6A LFPAK33

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Product details

Overview

BUK9M52-40EX from Nexperia is an AEC-Q101-qualified N-channel logic-level MOSFET in LFPAK33 (SOT1210) package, rated for 40 V V_DS, 52 mΩ R_DS(on) at V_GS = 5 V and T_j = 25 °C, and 175 °C junction operation - designed for high-reliability 12 V automotive power switching in transmission control, lamp drivers, and solenoid interfaces.

For engineers reviewing the BUK9M52-40EX datasheet, BUK9M52-40EX pinout, BUK9M52-40EX application, or BUK9M52-40EX equivalent, this page delivers verified electrical specs, thermal performance data, gate drive behavior at elevated temperature, avalanche ruggedness metrics, and automotive-grade qualification context - all directly traceable to Nexperia's official product data sheet dated 19 September 2016.

Technical Context

This MOSFET employs TrenchMOS technology and features a true logic-level gate with V_GS(th) ≥ 0.5 V at T_j = 175 °C, enabling direct 5 V microcontroller drive without level shifting. Its LFPAK33 package delivers 4.27 K/W typical R_th(j-mb), supporting high-power density mounting on thermally optimized PCBs.

The device is repetitively avalanche-rated (E_AS = 4.98 mJ unclamped), supports peak drain current up to 70 A (t_p ≤ 10 µs), and maintains R_DS(on) ≤ 101 mΩ at 175 °C - confirming robustness in thermally demanding automotive transients and sustained load conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V - Maximum drain-source blocking voltage compatible with 12 V automotive systems including load dump transients.
R_DS(on)	40.7–52 mΩ @ V_GS = 5 V, I_D = 5 A, T_j = 25 °C - Enables low conduction loss in high-current switching paths.
I_D (continuous)	17.6 A @ T_mb = 25 °C - Sustained current capability under standard heatsink conditions.
P_tot	31 W @ T_mb = 25 °C - Total power dissipation limit defining thermal design envelope.
Q_GD	2 nC - Gate-drain charge determining switching speed and Miller-effect sensitivity during turn-off.
R_th(j-mb)	4.27 K/W typ - Junction-to-mounting-base thermal resistance enabling accurate board-level thermal modeling.
V_GS(th)	≥ 0.5 V @ T_j = 175 °C - Ensures reliable turn-on even at maximum operating temperature.

Pinout & Package

LFPAK33 (SOT1210) is a surface-mount, single-ended power package with exposed drain mounting base and three parallel source terminals for low-inductance, high-current return paths. The package integrates thermal and electrical performance via copper-clip construction and optimized die attach.

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 applications.
4	Gate (G)	Single gate input with low Q_G(tot) = 4.5 nC - minimizes driver power and enables fast switching with 5 V logic.
Mounting base (mb)	Drain (D)	Exposed copper drain pad provides primary thermal path and low-inductance high-current connection to PCB ground plane.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive use per stress test requirements - ensures reliability in engine bay and transmission control environments.
Repetitive avalanche rating	E_AS = 4.98 mJ (unclamped) - allows safe operation during inductive load switching without external snubbers.
175 °C junction rating	Enables continuous operation in under-hood locations where ambient exceeds 125 °C - reduces need for derating or forced cooling.
True logic-level gate	V_GS(th) ≥ 0.5 V at 175 °C - guarantees turn-on margin with standard 5 V MCU GPIOs across full temperature range.
Low R_DS(on) drift with temperature	R_DS(on) ≤ 101 mΩ at 175 °C - maintains efficiency in high-temperature steady-state operation.

Applications

Transmission Control Module

Lamp Driver Unit

Use Scenario: High-side switching of solenoids and actuators in automatic transmission valve bodies.

IC Role / Device Role / Timing Role: Power switch controlling 12 V, 5–10 A inductive loads with fast turn-on/turn-off timing to meet gear-shift response targets.

Use Value: Repetitive avalanche rating eliminates need for external flyback diodes; 175 °C rating avoids thermal shutdown during prolonged engagement.

Use Scenario: PWM dimming and on/off control of LED headlamps and daytime running lights.

IC Role / Device Role / Timing Role: Low-loss, high-frequency switching element in constant-current LED driver output stage.

Use Value: 52 mΩ R_DS(on) minimizes conduction loss at 2–3 A; low Q_GD enables clean 1–2 kHz PWM edges without shoot-through risk.

Engine Start-Stop System

Body Control Module (BCM)

Use Scenario: Load switching for starter motor relay coil and auxiliary battery management circuits.

IC Role / Device Role / Timing Role: Robust power FET handling repeated cold-crank pulses and load dump surges up to ±60 V.

Use Value: 40 V V_DS withstands ISO 7637-2 pulse 5a/b; 70 A peak current supports high-inrush relay actuation.

Use Scenario: Centralized control of door locks, window motors, and HVAC actuators in modern BCMs.

IC Role / Device Role / Timing Role: Protected high-side switch interfacing with CAN/LIN microcontrollers for fault-tolerant load management.

Use Value: Integrated source configuration simplifies PCB layout; AEC-Q101 compliance ensures long-term field reliability in 15+ year vehicle lifetimes.

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) @ 10 V, 75 A I_D; requires 10 V gate drive; not logic-level.	Better conduction efficiency at high current but needs gate driver IC; unsuitable for direct 5 V MCU drive.	Select when higher current capacity and lower R_DS(on) justify added gate drive complexity.
ON Semiconductor NTMFS4C09NT1G	40 V, 4.9 mΩ R_DS(on) @ 10 V; 175 °C rated; logic-level capable down to 4.5 V V_GS.	Lower R_DS(on) than BUK9M52-40EX but higher Q_G (12 nC); less avalanche ruggedness (E_AS = 2.5 mJ).	Prefer for space-constrained designs needing lower on-resistance, provided transient robustness is verified.

Compared with STL220N4F7AG and NTMFS4C09NT1G, BUK9M52-40EX uniquely balances 5 V logic compatibility, 175 °C operation, and repetitive avalanche capability - making it optimal for cost-sensitive, thermally constrained automotive modules where gate drive simplicity and transient resilience are prioritized over ultra-low R_DS(on).

Availability

BUK9M52-40EX is available at Aetrix Electronics and suitable for automotive transmission control, body electronics, and engine management systems requiring stable component supply, long-lifecycle support, and AEC-Q101-compliant sourcing.

Supply support for BUK9M52-40EX 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 high-volume, high-reliability discrete and logic devices - delivering scalable solutions for automotive, industrial, and consumer markets with emphasis on quality and sustainability.

BUK9M52-40EX belongs to Nexperia's Automotive Logic-Level MOSFET product line, engineered specifically for robust, thermally resilient power switching in 12 V automotive subsystems where AEC-Q101 compliance and gate-drive simplicity are mandatory.

FAQ

Is BUK9M52-40EX suitable for direct 5 V microcontroller gate drive?

Yes. It is a true logic-level MOSFET with V_GS(th) ≥ 0.5 V at T_j = 175 °C and R_DS(on) = 52 mΩ at V_GS = 5 V and T_j = 25 °C. This ensures guaranteed turn-on and low conduction loss using standard 5 V GPIO outputs without external level-shifting circuitry.

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

Per Figure 2 in the datasheet, the continuous drain current is 12.4 A at T_mb = 100 °C and V_GS ≥ 5 V. This reflects thermal derating due to reduced heat dissipation at elevated board temperatures - critical for under-hood placement.

Does BUK9M52-40EX include integrated ESD or overvoltage protection?

No. It is a bare silicon MOSFET without integrated protection circuitry. External TVS diodes and gate resistors are required for ISO 7637-2 pulse suppression and ESD immunity - consistent with standard automotive power FET implementation practices.

How does its avalanche ruggedness compare to non-automotive equivalents?

BUK9M52-40EX is specified for repetitive avalanche with E_AS = 4.98 mJ (unclamped), validated per AEC-Q101. Most commercial-grade MOSFETs omit repetitive avalanche testing; this rating confirms suitability for inductive load switching in automotive without snubber networks.

BUK9M52-40EX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: TrenchMOS™

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:: 17.6A (Tj)

Drive Voltage (Max Rds On, Min Rds On):: 5V, 10V

Rds On (Max) @ Id, Vgs:: 40mOhm @ 5A, 10V

Vgs(th) (Max) @ Id:: 2.1V @ 1mA

Gate Charge (Qg) (Max) @ Vgs:: 4.5 nC @ 5 V

Vgs (Max):: ±10V

Input Capacitance (Ciss) (Max) @ Vds:: 407 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 31W

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: LFPAK33

BUK9M52-40EX FAQ

1.How can I place an order for BUK9M52-40EX through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK9M52-40EX 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 BUK9M52-40EX reliable?

The price and inventory of BUK9M52-40EX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9M52-40EX is usually 5 days.

3.What payment methods are accepted for BUK9M52-40EX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK9M52-40EX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK9M52-40EX?

BUK9M52-40EX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK9M52-40EX 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 BUK9M52-40EX?

For technical support, including BUK9M52-40EX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9M52-40EX requirements.

6.How does Aetrix verify that BUK9M52-40EX is sourced from the original manufacturer or authorized distributors?

All BUK9M52-40EX 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 BUK9M52-40EX meets industry standards.

7.What is the process for return or replacement of BUK9M52-40EX?

All BUK9M52-40EX units undergo pre-shipment inspection (PSI). If there is an issue with BUK9M52-40EX, 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 BUK9M52-40EX part is unused and in its original packaging.

Return procedure for BUK9M52-40EX:

1.Submit a request within 90 days.

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

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