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

Nexperia USA Inc. BUK9209-40B,118

Name: BUK9209-40B,118
Brand: Nexperia USA Inc.
SKU: BUK9209-40B,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK9209-40B,118

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: BUK9209-40B,118.pdf

Description:: MOSFET N-CH 40V 75A DPAK

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Product details

Overview

BUK9209-40B from Nexperia is a logic-level N-channel TrenchMOS FET in DPAK (SOT428) package, rated for 40 V V_DS, 75 A continuous drain current at T_mb = 25 °C, and 185 °C junction temperature. It delivers 6.2 mΩ R_DS(on) at V_GS = 10 V and 25 °C, supports direct 5 V microcontroller gate drive, and is AEC-Q101 qualified for automotive power switching.

For engineers reviewing the BUK9209-40B datasheet, BUK9209-40B pinout, BUK9209-40B application, or BUK9209-40B equivalent, this device is selected for thermally demanding 12 V automotive loads where low conduction loss, avalanche ruggedness (242 mJ), and logic-level compatibility are critical design requirements.

Technical Context

This MOSFET employs TrenchMOS technology to achieve low R_DS(on) while maintaining robust switching performance: Q_GD = 12 nC and t_f = 89 ns enable efficient high-frequency PWM control in motor and lamp drivers. Its gate threshold voltage (V_GS(th)) ranges from 0.4 V at 185 °C to 2.3 V at −55 °C, ensuring reliable turn-on across automotive temperature extremes.

The device features an integrated source-drain diode with V_SD = 0.85 V at 25 A and T_j = 25 °C, and exhibits 2.5 nH internal drain inductance and 7.5 nH source inductance - parameters critical for minimizing voltage overshoot during fast switching in inductive load circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V - Maximum drain-source blocking voltage; defines safe operation in 12 V automotive systems with load-dump transients.
R_DS(on) @ V_GS = 5 V	7.6 mΩ (typ) - Enables direct 5 V MCU drive without level-shifting; limits I²R loss to ≤4.7 W at 25 A.
P_tot	167 W @ T_mb = 25 °C - High power capability supported by low R_th(j-mb) = 0.95 K/W for heatsink-mounted designs.
E_AS	242 mJ - Unclamped avalanche energy rating ensures robustness against inductive kickback in solenoid/motor control.
V_GS(th)	1.1–2.0 V (25 °C) - Low, tightly distributed threshold enables predictable turn-on with standard logic outputs.
C_iss	2714 pF (typ) - Input capacitance value used to calculate required gate driver peak current for target switching speed.
T_j max	185 °C - Extended junction temperature rating allows operation in under-hood environments without derating.

Pinout & Package

Package: DPAK (SOT428), plastic single-ended surface-mounted package with 3 leads (lead 2 cropped); mounting base (mb) electrically connected to drain and serves as primary thermal path.

Pin/Terminal	Circuit Role	Design Meaning
1 (G)	Gate	Control terminal; accepts 5 V logic-level signals; requires <10 Ω external gate resistor to limit ringing and optimize EMI.
2 (D)	Drain	High-side power input; internally connected to mounting base; must be soldered to copper pour for thermal management.
3 (S)	Source	Power return path; referenced to system ground; forms common node with gate driver return for stable switching.

Key Features

Feature	Design Value
Logic-level gate drive	Operates fully enhanced at V_GS = 5 V, eliminating need for gate driver ICs in MCU-based 12 V systems.
AEC-Q101 qualification	Validated for automotive safety-critical applications including engine control, body electronics, and ADAS power stages.
185 °C junction rating	Enables uninterrupted operation in under-bonnet locations without thermal shutdown or derating penalties.
Low R_DS(on) × Q_G figure of merit	7.6 mΩ × 32 nC = 243 mΩ·nC - balances conduction and switching losses for high-efficiency 10–100 kHz PWM.
Integrated source-drain diode	V_SD = 0.85 V @ 25 A provides freewheeling path for inductive loads without external catch diode.

Applications

Automotive Body Control Module

12 V DC Motor Driver

Use Scenario: Switching power to door locks, window lifts, and seat adjusters in modern BCMs.

IC Role / Device Role / Timing Role: High-side load switch controlling 12 V battery-fed inductive actuators.

Use Value: 75 A rating handles motor stall currents; 242 mJ avalanche energy absorbs back-EMF without failure.

Use Scenario: H-bridge half-bridge leg in brushed DC motor control for HVAC blowers or radiator fans.

IC Role / Device Role / Timing Role: Synchronous rectifier and PWM-controlled power switch operating up to 20 kHz.

Use Value: 6.2 mΩ R_DS(on) at 10 V reduces conduction loss to <1.5 W at 20 A, improving thermal margin.

LED Headlamp Power Stage

Solenoid Actuator Interface

Use Scenario: Constant-current regulation and on/off control of high-brightness LED arrays in adaptive front lighting.

IC Role / Device Role / Timing Role: Low-side current-sense switch in buck converter feedback loop with 5 V gate drive.

Use Value: 5 V compatible gate enables direct connection to automotive CAN/LIN microcontrollers; 185 °C rating sustains long-term reliability.

Use Scenario: Driving fuel injectors, transmission shift solenoids, or ABS modulator valves in powertrain systems.

IC Role / Device Role / Timing Role: Fast-switching, high-current driver with controlled dI/dt to minimize EMI in safety-critical paths.

Use Value: 89 ns fall time and 2.5 nH internal drain inductance reduce voltage spikes during solenoid de-energization.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel logic-level power FET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STL220N4F7AG	40 V, 220 A, R_DS(on) = 2.2 mΩ @ 10 V; DFN5x6 package; no mounting base.	Higher current capacity but requires PCB-level thermal design; lacks integrated mounting base for bolt-down heatsinking.	Select when board space permits larger footprint and higher peak current is needed; not drop-in for DPAK footprints.
IRLR024NPBF	55 V, 17 A, R_DS(on) = 45 mΩ @ 10 V; TO-220AB package; non-automotive grade.	Lower current and higher R_DS(on); not AEC-Q101 qualified; unsuitable for safety-critical automotive use.	Consider only for cost-sensitive non-automotive prototypes; does not meet thermal or reliability requirements of BUK9209-40B.

Compared with STL220N4F7AG and IRLR024NPBF, the BUK9209-40B uniquely combines AEC-Q101 qualification, DPAK-mounting base for mechanical and thermal robustness, and 7.6 mΩ R_DS(on) at 5 V - making it the only viable choice for production-grade 12 V automotive switching where reliability, thermal management, and logic-level drive are jointly required.

Availability

BUK9209-40B is available at Aetrix Electronics and suitable for automotive body control modules, 12 V DC motor drives, and solenoid actuator interfaces requiring stable component supply across extended temperature and lifetime requirements.

Supply support for BUK9209-40B 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 discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.

The BUK9209-40B belongs to Nexperia's TrenchMOS logic-level automotive power FET product line, engineered specifically for robust, high-current 12 V load switching in thermally constrained automotive environments.

FAQ

Is BUK9209-40B suitable for high-frequency PWM above 50 kHz?

Yes - with Q_GD = 12 nC, Q_G(tot) = 32 nC, and t_f = 89 ns, the BUK9209-40B supports PWM frequencies up to 100 kHz in well-designed gate-drive circuits. However, switching losses rise significantly above 50 kHz; thermal design must account for increased P_sw using the provided C_iss, C_oss, and Crss values.

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

At T_mb = 100 °C and V_GS = 5 V, the maximum continuous drain current is 70 A, as specified in Table 4 (Limiting Values). This reflects thermal derating due to reduced heat dissipation capability at elevated temperatures - not a device limitation.

Can BUK9209-40B replace a standard 40 V MOSFET with 10 V gate drive in an existing design?

Yes - its R_DS(on) of 6.2 mΩ at V_GS = 10 V matches or exceeds typical 40 V MOSFETs, and its DPAK footprint is identical. However, verify gate drive strength: the BUK9209-40B draws higher Q_G (32 nC), so ensure the driver can source/sink ≥1 A peak current to maintain fast switching.

Does the mounting base require electrical isolation from the heatsink?

No - the mounting base is internally connected to the drain (pin 2), so it must be electrically isolated from any grounded heatsink using an insulating pad or mica washer. Failure to isolate will short the drain to ground and destroy the device immediately upon power-up.

BUK9209-40B,118 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: TrenchMOS™

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 40 V

Current - Continuous Drain (Id) @ 25°C:: 75A (Tc)

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

Rds On (Max) @ Id, Vgs:: 7mOhm @ 25A, 10V

Vgs(th) (Max) @ Id:: 2V @ 1mA

Gate Charge (Qg) (Max) @ Vgs:: 32 nC @ 5 V

Vgs (Max):: ±15V

Input Capacitance (Ciss) (Max) @ Vds:: 3619 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 167W (Tc)

Operating Temperature:: -55°C ~ 185°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

BUK9209-40B,118 FAQ

1.How can I place an order for BUK9209-40B,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK9209-40B,118 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 BUK9209-40B,118 reliable?

The price and inventory of BUK9209-40B,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9209-40B,118 is usually 5 days.

3.What payment methods are accepted for BUK9209-40B,118?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK9209-40B,118 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK9209-40B,118?

BUK9209-40B,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK9209-40B,118 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 BUK9209-40B,118?

For technical support, including BUK9209-40B,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9209-40B,118 requirements.

6.How does Aetrix verify that BUK9209-40B,118 is sourced from the original manufacturer or authorized distributors?

All BUK9209-40B,118 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 BUK9209-40B,118 meets industry standards.

7.What is the process for return or replacement of BUK9209-40B,118?

All BUK9209-40B,118 units undergo pre-shipment inspection (PSI). If there is an issue with BUK9209-40B,118, 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 BUK9209-40B,118 part is unused and in its original packaging.

Return procedure for BUK9209-40B,118:

1.Submit a request within 90 days.

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

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