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

Nexperia USA Inc. BUK7D25-40EX

Name: BUK7D25-40EX
Brand: Nexperia USA Inc.
SKU: BUK7D25-40EX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK7D25-40EX

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: 6-UDFN Exposed Pad

Datasheet:: BUK7D25-40EX.pdf

Description:: MOSFET N-CH 40V 8A DFN2020MD-6

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BUK7D25-40EX from Nexperia is a 40 V, 19 A N-channel Trench MOSFET in DFN2020MD-6 (SOT1220) package, optimized for low-side load switching with 18 mΩ R_DS(on) at V_GS = 10 V and T_j = 25 °C, AEC-Q101 qualified for automotive relay drivers and high-speed line drivers.

For engineers reviewing the BUK7D25-40EX datasheet, BUK7D25-40EX pinout, BUK7D25-40EX application, or BUK7D25-40EX equivalent, this device supports thermally demanding industrial and automotive systems requiring side-wettable flanks for optical solder inspection, extended 175 °C junction operation, and ultra-thin 2 × 2 × 0.65 mm footprint.

Technical Context

This N-channel enhancement-mode MOSFET uses Trench technology to achieve low on-resistance and fast switching: t_d(on) = 3 ns, t_r = 6 ns, Q_G(tot) = 8.6 nC, and C_iss = 460 pF at V_DS = 20 V. Its gate threshold voltage (V_GS(th)) ranges 2.4–4.0 V at T_j = 25 °C, enabling robust TTL/CMOS-level drive compatibility.

The device features an integrated source-drain diode with V_SD = 0.8–1.2 V at I_S = 2.3 A and T_j = 25 °C, and demonstrates avalanche ruggedness of 28.4 mJ (unclamped, I_D = 1.35 A). Thermal resistance R_th(j-sp) is 6–10 K/W to solder point, supporting high-power density PCB layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V - Maximum drain-source blocking voltage; defines safe operating range in 12 V/24 V automotive and industrial power rails.
R_DS(on)	18–25 mΩ @ V_GS = 10 V, I_D = 8 A, T_j = 25 °C - Enables <1.5 W conduction loss at 8 A, critical for thermal management in compact designs.
I_D	19 A @ T_sp = 25 °C - Continuous drain current rating under ideal board-mount conditions (6 cm² drain pad), usable up to 12 A at 100 °C ambient.
P_tot	15 W @ T_sp = 25 °C - Total power dissipation limit; derates to ~2.3 W at 25 °C ambient on FR4, defining practical continuous load capability.
T_j max	175 °C - Maximum junction temperature; enables operation in under-hood automotive environments and sealed industrial enclosures without active cooling.
Q_G(tot)	8.6–13 nC - Total gate charge; determines driver strength requirement and switching energy loss in PWM applications.
AEC-Q101	Qualified - Confirmed reliability for automotive electronics per stress-test standard, including HTGB, HTRB, and ESD (HBM 500 V).

Pinout & Package

DFN2020MD-6 (SOT1220) is a leadless, ultra-thin 2 × 2 × 0.65 mm surface-mount package with side-wettable flanks for automated optical solder-joint inspection. Thermal performance is enhanced via exposed drain terminals on the bottom side.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 5, 6, 7	Drain (D)	Five parallel drain terminals - collectively form low-inductance, high-current path to PCB copper pour; primary thermal conduction route to board.
3	Gate (G)	Single gate input - requires <10 Ω series resistance for EMI control; sensitive to ESD due to thin oxide (V_GS abs max = ±20 V).
4, 8	Source (S)	Two source terminals - provide return path for load current and reference for gate drive; define local ground node for switching loop minimization.

Key Features

Feature	Design Value
Side-wettable flanks	Enables 100% automated optical inspection (AOI) of solder joints without X-ray, reducing manufacturing defect escape in automotive production.
Trench MOSFET architecture	Delivers 30% lower R_DS(on) vs planar equivalents at same voltage class, improving efficiency in battery-powered and thermally constrained systems.
Ultra-thin 0.65 mm profile	Supports ultra-low-profile PCB stacking in space-constrained modules (e.g., motor control ICs, LED drivers, and body-control units).
175 °C junction rating	Permits operation in high-temperature zones (e.g., near engines or power converters) without derating or forced air cooling.
AEC-Q101 qualification	Validates reliability for automotive applications including engine management, lighting, and ADAS power stages per industry stress-test requirements.

Applications

Automotive Relay Driver

Industrial Low-Side Load Switch

Use Scenario: Replacing electromechanical relays in vehicle door modules, seat controls, and HVAC actuators.

IC Role / Device Role / Timing Role: N-channel low-side switch controlling 12 V solenoid or lamp loads with fast turn-on (<10 ns) and minimal bounce.

Use Value: Eliminates relay wear-out, reduces acoustic noise, and cuts PCB area by >50% versus through-hole relay + driver IC solutions.

Use Scenario: Powering sensors, solenoids, and indicator LEDs in programmable logic controllers (PLCs) and factory automation I/O modules.

IC Role / Device Role / Timing Role: High-reliability, thermally robust low-side switch with integrated diode for inductive load freewheeling.

Use Value: Supports continuous 8 A loads at 70 °C ambient without heatsink, enabling fanless enclosure design and long-term field uptime.

High-Speed CAN Bus Line Driver

USB-C Power Delivery Switch

Use Scenario: Driving CAN FD physical layer transceivers in automotive gateway ECUs where signal integrity and EMI must be tightly controlled.

IC Role / Device Role / Timing Role: Fast-switching N-MOSFET used in active termination or bias network switching with sub-10 ns edge control.

Use Value: Low C_iss (460 pF) and Q_GD (2.6 nC) minimize signal distortion and enable clean 5 Mbps CAN FD waveform shaping.

Use Scenario: Controlling V_BUS path in USB-C PD sink applications requiring bidirectional 20 V/3 A power routing with reverse-voltage protection.

IC Role / Device Role / Timing Role: Low-R_DS(on) N-channel switch placed in source-follower configuration with external gate control for reverse-blocking.

Use Value: 18 mΩ R_DS(on) limits conduction loss to <110 mW at 3 A, meeting USB PD 3.0 efficiency targets while maintaining thermal safety margin.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel low-side switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor NTMFS4C09NT1G	R_DS(on) = 2.9 mΩ @ 10 V (lower), but larger 5×6 mm SO-8 package and no AEC-Q101 qualification.	Better for high-efficiency DC-DC secondary side; unsuitable for space-constrained automotive modules requiring AOI.	Select when lowest possible conduction loss dominates over size, qualification, and manufacturability requirements.
Vishay SI2302DS-T1-BE3	R_DS(on) = 48 mΩ @ 4.5 V, SOT-23 package, rated only to 150 °C junction, no side-wettable flanks.	Acceptable for cost-sensitive consumer-grade low-power switches; fails automotive thermal and inspection requirements.	Choose only for non-automotive, low-current (<2 A), non-AOI production environments with tight BOM cost targets.

Compared with NTMFS4C09NT1G and SI2302DS-T1-BE3, BUK7D25-40EX uniquely balances ultra-compact size, AEC-Q101 compliance, side-wettable flanks, and 175 °C operation-making it the only viable option for next-generation automotive body electronics where all four attributes are mandatory.

Availability

BUK7D25-40EX is available at Aetrix Electronics and suitable for automotive relay drivers, industrial low-side load switches, and high-speed line drivers requiring stable component supply across multi-year production cycles and global Tier-1 OEM programs.

Supply support for BUK7D25-40EX 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 leading Dutch semiconductor manufacturer specializing in high-volume, high-reliability discrete and logic devices, with core expertise in advanced packaging and automotive-qualified components.

BUK7D25-40EX belongs to Nexperia's TrenchMOS automotive power portfolio, engineered specifically for robust, space-efficient low-side switching in harsh-environment automotive and industrial control systems.

FAQ

What is the maximum continuous drain current for BUK7D25-40EX at 100 °C ambient temperature?

At T_amb = 100 °C on a standard FR4 PCB with 6 cm² drain pad, the maximum continuous drain current is 12 A, as specified in Table 5 (Limiting Values) of the datasheet. This reflects thermal derating due to reduced heat dissipation capacity at elevated ambient temperatures.

Does BUK7D25-40EX require a gate resistor for reliable switching in automotive applications?

Yes-a 5–10 Ω gate series resistor is recommended to dampen ringing, limit peak gate current, and reduce EMI during fast switching (t_r/t_f < 10 ns). The device's low Q_G(tot) (8.6 nC) makes it especially sensitive to gate-drive impedance mismatches in noisy automotive harness environments.

Can BUK7D25-40EX be used in synchronous rectification topologies?

No-BUK7D25-40EX is not characterized or qualified for synchronous rectification. Its body diode recovery time (t_rr = 14.3 ns) and Q_r (6.1 nC) are not optimized for high-frequency reverse-recovery stress, and its gate threshold voltage lacks the tight distribution required for self-driven SR control.

Is the DFN2020MD-6 package compatible with standard reflow profiles for lead-free soldering?

Yes-the DFN2020MD-6 package is qualified for JEDEC J-STD-020D-compliant lead-free reflow, with peak temperature up to 260 °C. Figure 19 in the datasheet provides the exact solder land pattern (0.65 mm pitch, 0.33 mm pad width) and paste deposit volume for optimal wetting of side-wettable flanks.

BUK7D25-40EX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: 6-UDFN Exposed Pad

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:: 8A (Ta)

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

Rds On (Max) @ Id, Vgs:: 25mOhm @ 8A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 13 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 460 pF @ 20 V

FET Feature:: -

Power Dissipation (Max):: 15W (Tc)

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DFN2020MD-6

BUK7D25-40EX FAQ

1.How can I place an order for BUK7D25-40EX through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK7D25-40EX 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 BUK7D25-40EX reliable?

The price and inventory of BUK7D25-40EX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK7D25-40EX is usually 5 days.

3.What payment methods are accepted for BUK7D25-40EX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK7D25-40EX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK7D25-40EX?

BUK7D25-40EX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK7D25-40EX 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 BUK7D25-40EX?

For technical support, including BUK7D25-40EX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK7D25-40EX requirements.

6.How does Aetrix verify that BUK7D25-40EX is sourced from the original manufacturer or authorized distributors?

All BUK7D25-40EX 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 BUK7D25-40EX meets industry standards.

7.What is the process for return or replacement of BUK7D25-40EX?

All BUK7D25-40EX units undergo pre-shipment inspection (PSI). If there is an issue with BUK7D25-40EX, 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 BUK7D25-40EX part is unused and in its original packaging.

Return procedure for BUK7D25-40EX:

1.Submit a request within 90 days.

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

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