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

Nexperia USA Inc. BUK7M8R0-40EX

Name: BUK7M8R0-40EX
Brand: Nexperia USA Inc.
SKU: BUK7M8R0-40EX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK7M8R0-40EX

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

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

Datasheet:: BUK7M8R0-40EX.pdf

Description:: MOSFET N-CH 40V 69A LFPAK33

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Product details

Overview

BUK7M8R0-40EX from Nexperia is a standard-level N-channel TrenchMOS power MOSFET in LFPAK33 (SOT1210) package, rated for 40 V drain-source voltage, 8 mΩ R_DS(on) at V_GS = 10 V and T_j = 25 °C, and qualified to AEC-Q101 for automotive use. It delivers 69 A continuous drain current at T_mb = 25 °C and supports thermally demanding applications up to 175 °C junction temperature - deployed in 12 V automotive motor control and transmission systems.

For engineers reviewing the BUK7M8R0-40EX datasheet, BUK7M8R0-40EX pinout, BUK7M8R0-40EX application, or BUK7M8R0-40EX equivalent, key selection criteria include its 1.82 K/W junction-to-mounting-base thermal resistance, repetitive avalanche rating, true standard-level gate threshold (>1 V at 175 °C), and LFPAK33 package's high-power density performance in space-constrained automotive PCB layouts.

Technical Context

This MOSFET uses TrenchMOS technology to achieve low on-resistance and fast switching with Q_GD = 8.3 nC and t_f = 12.8 ns under specified conditions. Its gate threshold voltage remains functional across -55 °C to 175 °C, enabling robust operation in engine bay environments.

The device integrates an intrinsic source-drain diode with V_SD = 0.87 V at I_S = 20 A and T_j = 25 °C, and supports unclamped inductive switching with E_AS = 39.9 mJ at T_j(init) = 25 °C - critical for solenoid and lamp load management without external freewheeling diodes.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V - Maximum blocking voltage for 12 V automotive battery rail transients (e.g., load dump up to 40 V).
R_DS(on)	6.6–8 mΩ @ V_GS = 10 V, I_D = 20 A, T_j = 25 °C - Enables <1 W conduction loss at 40 A, reducing heatsink requirements.
I_D (cont)	69 A @ T_mb = 25 °C - Supports high-current DC loads such as radiator fans and HVAC blowers without derating.
P_tot	75 W @ T_mb = 25 °C - High power dissipation capability enabled by low R_th(j-mb) = 1.82 K/W.
Q_GD	8.3 nC - Low gate-drain charge minimizes Miller-induced switching delay and improves hard-switching efficiency.
T_j max	175 °C - Extended junction temperature rating allows placement near heat sources (e.g., engine control units).
V_GS(th)	>1 V @ T_j = 175 °C - Ensures reliable turn-on with standard 5 V or 3.3 V microcontroller GPIOs even at peak under-hood temperatures.

Pinout & Package

LFPAK33 (SOT1210) is a thermally enhanced surface-mount package with exposed mounting base connected to drain, optimized for high-current automotive PCBs. It features four source terminals, one gate terminal, and drain connection via the metal mounting base - enabling low-inductance, high-thermal-conductivity layout.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3	Source (S)	Three parallel source leads reduce bond wire inductance and improve current sharing during high di/dt switching.
4	Gate (G)	Single gate input with low C_iss = 1178 pF (typ), compatible with standard gate drivers without excessive drive strength.
Mounting base	Drain (D)	Exposed copper pad electrically and thermally connected to drain - provides primary heat path to PCB copper pour or heatsink.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and UHAST - suitable for safety-critical ECUs without additional qualification.
Repetitive avalanche rated	Rated for repeated unclamped inductive switching events (E_AS = 39.9 mJ), eliminating need for external snubbers in solenoid driver designs.
175 °C junction rating	Enables direct mounting on hot surfaces (e.g., transmission control modules) while maintaining gate control margin and R_DS(on) stability.
Standard-level gate drive	V_GS(th) > 1 V at 175 °C ensures compatibility with 3.3 V/5 V logic without level-shifting, simplifying MCU interface design.
Low R_th(j-mb)	1.82 K/W thermal resistance enables >50 W power handling on 2 oz copper with 10 cm² thermal pad - reduces system size vs. TO-252 alternatives.

Applications

Engine Cooling Fan Control

Automatic Transmission Solenoid Driver

Use Scenario: PWM-controlled 12 V DC brushless fan in engine compartment, operating continuously at ambient up to 125 °C.

IC Role / Device Role / Timing Role: High-side or low-side power switch managing up to 60 A peak current with 20 kHz PWM frequency.

Use Value: Low R_DS(on) and 175 °C rating minimize thermal derating and eliminate external heatsinks, while repetitive avalanche withstand protects against back-EMF during abrupt shutdown.

Use Scenario: Precision current-regulated solenoid actuator in 8-speed automatic transmission valve body.

IC Role / Device Role / Timing Role: Constant-current switch delivering 2–5 A with <1 µs turn-off for hydraulic pressure modulation.

Use Value: Fast tf = 12.8 ns and low Q_GD enable accurate current shaping; integrated body diode eliminates discrete flyback diode, saving board area and BOM cost.

LED Headlamp Dimming Circuit

Start-Stop System Load Disconnect

Use Scenario: High-brightness LED array (40–60 W) in adaptive front lighting, requiring analog dimming and overvoltage protection.

IC Role / Device Role / Timing Role: Low-side switch modulating LED current via linear or PWM control with fast transient response.

Use Value: 40 V V_DS withstands 12 V system transients; low R_DS(on) limits self-heating during linear dimming, preserving color consistency and lifetime.

Use Scenario: Isolation of auxiliary loads (e.g., infotainment, HVAC) during engine cranking to prevent brownout in start-stop vehicles.

IC Role / Device Role / Timing Role: High-reliability power path switch activated by BCM signal, handling 50 A inrush and steady-state current.

Use Value: AEC-Q101 qualification ensures lifecycle robustness over 15 years; mounting base thermal path maintains stable R_DS(on) during repeated cranking cycles.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STL220N4F7AG	40 V, 2.2 mΩ R_DS(on), PowerFLAT 5x6 package, 175 °C rated, but requires gate drive ≥ 4.5 V for full enhancement.	Better conduction efficiency at high current; less tolerant of marginal gate drive in cold-cranking scenarios.	Select when lowest possible conduction loss dominates over gate drive simplicity.
IRL8721PBF	30 V, 7.5 mΩ R_DS(on), TO-220AB package, not AEC-Q101 qualified, max T_j = 175 °C.	Limited to 30 V systems; lacks automotive qualification and repetitive avalanche rating.	Acceptable only for non-automotive industrial 12 V loads where qualification and transient robustness are not required.

Compared with STL220N4F7AG and IRL8721PBF, BUK7M8R0-40EX uniquely combines AEC-Q101 compliance, 40 V rating, standard-level gate, and repetitive avalanche capability in a thermally superior LFPAK33 package - making it the optimal choice for production automotive power switching where reliability, thermal margin, and system-level robustness are mandatory.

Availability

BUK7M8R0-40EX is available at Aetrix Electronics and suitable for engine cooling fan control, automatic transmission solenoid drivers, and LED headlamp dimming circuits requiring stable component supply across automotive production lifecycles.

Supply support for BUK7M8R0-40EX 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 essential semiconductors - delivering discrete, logic, and MOSFET solutions optimized for automotive, industrial, and mobile markets.

BUK7M8R0-40EX belongs to Nexperia's Automotive Logic and Power portfolio, engineered specifically for high-efficiency, high-temperature power switching in 12 V vehicle subsystems - emphasizing AEC-Q101 reliability, thermal resilience, and seamless integration with 3.3 V/5 V microcontrollers.

FAQ

What is the maximum continuous drain current for BUK7M8R0-40EX at 100 °C mounting base temperature?

At T_mb = 100 °C, the continuous drain current is 48.8 A per the datasheet's Figure 2. This reflects thermal derating due to reduced heat dissipation capacity - users must ensure PCB copper area and airflow maintain T_mb ≤ 100 °C to sustain this current without exceeding P_tot = 75 W limit or T_j = 175 °C.

Does BUK7M8R0-40EX require a gate resistor for automotive PWM switching at 20 kHz?

A gate resistor is recommended: 5 Ω is used in the datasheet's switching time test conditions (Figure 3). This value balances turn-on speed (t_r = 14 ns) and gate ringing suppression. Lower values risk overshoot and EMI; higher values increase switching losses - typical design range is 3–10 Ω depending on driver strength and layout parasitics.

How does the LFPAK33 package compare thermally to TO-252 (DPAK) for this MOSFET?

LFPAK33 achieves R_th(j-mb) = 1.82 K/W versus ~3.5 K/W for standard TO-252 - nearly 2× better thermal performance. This results from direct die-to-mounting-base construction and larger copper area. In practice, BUK7M8R0-40EX in LFPAK33 dissipates 75 W at T_mb = 25 °C, whereas a TO-252 equivalent would be limited to ~35–40 W under identical conditions.

Is the source-drain diode suitable for freewheeling in inductive load applications?

Yes - the integrated body diode has V_SD = 0.87 V at I_S = 20 A and T_j = 25 °C, with t_rr = 22.2 ns and Q_r = 16.6 nC. It is rated for repetitive operation and supports efficient freewheeling in solenoid and motor drives, though external Schottky diodes may be added for ultra-low-loss or high-frequency designs.

BUK7M8R0-40EX 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:: 69A (Tc)

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

Rds On (Max) @ Id, Vgs:: 8mOhm @ 20A, 10V

Vgs(th) (Max) @ Id:: 4V @ 1mA

Gate Charge (Qg) (Max) @ Vgs:: 23.8 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 1567 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 75W (Tc)

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: LFPAK33

BUK7M8R0-40EX FAQ

1.How can I place an order for BUK7M8R0-40EX through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK7M8R0-40EX 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 BUK7M8R0-40EX reliable?

The price and inventory of BUK7M8R0-40EX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK7M8R0-40EX is usually 5 days.

3.What payment methods are accepted for BUK7M8R0-40EX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK7M8R0-40EX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK7M8R0-40EX?

BUK7M8R0-40EX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK7M8R0-40EX 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 BUK7M8R0-40EX?

For technical support, including BUK7M8R0-40EX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK7M8R0-40EX requirements.

6.How does Aetrix verify that BUK7M8R0-40EX is sourced from the original manufacturer or authorized distributors?

All BUK7M8R0-40EX 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 BUK7M8R0-40EX meets industry standards.

7.What is the process for return or replacement of BUK7M8R0-40EX?

All BUK7M8R0-40EX units undergo pre-shipment inspection (PSI). If there is an issue with BUK7M8R0-40EX, 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 BUK7M8R0-40EX part is unused and in its original packaging.

Return procedure for BUK7M8R0-40EX:

1.Submit a request within 90 days.

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

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