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

Nexperia USA Inc. BUK7208-40B,118

Name: BUK7208-40B,118
Brand: Nexperia USA Inc.
SKU: BUK7208-40B,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK7208-40B,118

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

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

Datasheet:: BUK7208-40B,118.pdf

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

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Product details

Overview

BUK7208-40B from Nexperia is a standard-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 6.6 mΩ typical R_DS(on) at V_GS = 10 V and ID = 25 A, and is AEC-Q101 qualified for automotive critical power switching.

For engineers reviewing the BUK7208-40B datasheet, BUK7208-40B pinout, BUK7208-40B application, or BUK7208-40B equivalent, key selection factors include its 185 °C thermal rating, unclamped avalanche energy of 242 mJ, gate-drive compatibility with standard 10 V logic, and DPAK mounting-base thermal path with R_th(j-mb) = 0.95 K/W.

Technical Context

This MOSFET uses TrenchMOS technology to achieve low on-resistance and high avalanche ruggedness. Its gate threshold voltage (V_GS(th)) ranges from 0.9 V at 185 °C to 4.4 V at –55 °C, enabling stable turn-on across automotive temperature extremes.

The device features integrated source-drain diode with 0.85 V forward drop at 17 A and 50 ns reverse recovery time, supporting synchronous rectification and inductive load commutation. Internal drain and source inductances are tightly controlled at 2.5 nH and 7.5 nH respectively for predictable switching behavior.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V maximum - supports 12 V automotive systems with robust overvoltage margin against load dump transients.
R_DS(on)	6.6 mΩ typ @ V_GS = 10 V, I_D = 25 A, T_j = 25 °C - enables <1 W conduction loss at 40 A, reducing heatsink requirements.
I_D (cont)	75 A @ T_mb = 25 °C - limited by DPAK package thermal capability, not die capacity.
E_AS	242 mJ unclamped avalanche energy - withstands inductive energy spikes without failure in motor/solenoid drive.
R_th(j-mb)	0.95 K/W - enables direct thermal coupling to PCB copper or heatsink via exposed mounting base (drain-connected).
Q_GD	11.5 nC - determines Miller plateau duration and influences switching speed under 10 V gate drive.
V_GS(th)	2–4 V @ T_j = 25 °C - ensures reliable enhancement-mode turn-on with standard logic-level drivers.

Pinout & Package

Package: SOT428 (DPAK), plastic single-ended surface-mounted package with exposed mounting base electrically connected to drain. Mounting base serves as primary thermal and electrical path for high-current drain connection.

Pin/Terminal	Circuit Role	Design Meaning
1 (G)	Gate	Control terminal; requires 10 V for full enhancement; Q_G(tot) = 35 nC defines gate drive strength requirement.
2 (D)	Drain	Main high-side power terminal; internally connected to mounting base; carries full load current and dissipates heat directly to PCB/heatsink.
3 (S)	Source	Power return path; referenced to system ground in low-side switch configuration; bond-wire inductance LS = 7.5 nH affects switching ringing.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive safety-critical applications including engine control and body electronics.
185 °C junction rating	Enables operation in under-hood environments without derating at elevated ambient temperatures.
TrenchMOS low R_DS(on)	6.6 mΩ typ reduces I²R losses and improves efficiency in 12 V battery-fed loads like lamps and solenoids.
Drain-connected mounting base	Provides low-thermal-resistance path (0.95 K/W) and eliminates need for isolated thermal interface materials.
Unclamped avalanche ruggedness	242 mJ energy handling allows safe operation during inductive turn-off without external snubbers in motor drives.

Applications

Automotive Body Control Module

12 V DC Motor Drive

Use Scenario: Switching headlamps, HVAC blowers, and door lock actuators in modern BCMs.

IC Role / Device Role / Timing Role: Low-side power switch controlling 12 V loads with PWM dimming or on/off sequencing.

Use Value: 75 A rating and 185 °C operation ensure reliability across vehicle life cycles; R_DS(on) minimizes board heating in densely packed modules.

Use Scenario: Driving brushed DC motors in power seats, sunroofs, and window lifts.

IC Role / Device Role / Timing Role: High-current unidirectional switch with fast turn-off (t_f = 51 ns) to limit back-EMF stress.

Use Value: 242 mJ avalanche energy absorbs inductive kickback without clamping diodes; DPAK base simplifies thermal design on motor-control PCBs.

Industrial Solenoid Driver

LED Lighting Power Stage

Use Scenario: Controlling fuel injectors, pneumatic valves, and hydraulic solenoids in industrial automation.

IC Role / Device Role / Timing Role: High-reliability power switch operating in thermally demanding enclosures with rapid duty cycling.

Use Value: AEC-Q101 qualification and 185 °C rating provide extended lifetime vs. commercial-grade MOSFETs; low Q_GD enables clean turn-off edge.

Use Scenario: Dimmable LED driver output stage in automotive lighting and commercial signage.

IC Role / Device Role / Timing Role: PWM-controlled current sink for constant-current LED strings powered from 12 V supply.

Use Value: 6.6 mΩ R_DS(on) maintains >95% efficiency at 5 A load; tight V_GS(th) tolerance ensures consistent turn-on across production batches.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STL220N4F7AG	40 V, 220 A (TO-263), R_DS(on) = 2.2 mΩ @ 10 V - higher current, lower R_DS(on), larger package.	Requires TO-263 footprint and higher gate drive current; better suited for high-power inverters than DPAK-constrained boards.	Select when board space permits larger package and >100 A peak current is needed; not drop-in compatible.
IRF3205PBF	55 V, 110 A (TO-220AB), R_DS(on) = 8.0 mΩ @ 10 V - higher voltage rating but no AEC-Q101 qualification.	Lacks automotive qualification and 185 °C rating; unsuitable for safety-critical or high-temp under-hood use.	Acceptable only for non-automotive 12 V industrial switching where qualification and extreme temperature are not required.

Compared with STL220N4F7AG and IRF3205PBF, BUK7208-40B uniquely balances AEC-Q101 compliance, DPAK form factor, 185 °C operation, and 6.6 mΩ R_DS(on) - making it optimal for space-constrained automotive modules requiring guaranteed reliability.

Availability

BUK7208-40B is available at Aetrix Electronics and suitable for automotive body control modules, 12 V motor drives, and industrial solenoid control requiring stable component supply across long production lifecycles.

Supply support for BUK7208-40B 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 high-volume, high-reliability discrete, logic, and MOSFET solutions, with leadership in automotive-qualified components.

BUK7208-40B belongs to Nexperia's TrenchMOS automotive power portfolio, engineered specifically for robust 12 V load switching in harsh environments - emphasizing thermal resilience, avalanche ruggedness, and AEC-Q101 compliance.

FAQ

Is BUK7208-40B suitable for high-frequency PWM switching?

Yes - with t_f = 51 ns and Q_GD = 11.5 nC, it supports PWM frequencies up to 100 kHz in motor and LED applications. However, switching losses increase above 50 kHz due to gate charge and internal inductance; layout optimization is essential for >20 kHz operation.

What is the maximum allowable PCB copper area for thermal performance?

The DPAK mounting base requires ≥100 mm² of 2 oz copper connected directly to the drain pad. Thermal resistance drops to ≤1.2 K/W with 200 mm² copper and one internal ground plane; insufficient copper causes T_j to exceed 185 °C at 75 A continuous.

Does BUK7208-40B require a gate resistor for automotive ESD protection?

A 10 Ω to 47 Ω series gate resistor is recommended to dampen ringing caused by LS = 7.5 nH and prevent false turn-on from ESD or crosstalk. The device itself has no integrated gate protection diode; external TVS is advised for ISO 10605-compliant designs.

Can BUK7208-40B replace BUZ72 in existing designs?

Yes - both are 40 V N-channel DPAK MOSFETs, but BUK7208-40B offers 6.6 mΩ vs. BUZ72's 12 mΩ R_DS(on), 242 mJ vs. 120 mJ avalanche energy, and AEC-Q101 qualification. Layout and gate drive remain compatible; thermal design benefits from lower on-resistance.

BUK7208-40B,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):: 10V

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

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

Gate Charge (Qg) (Max) @ Vgs:: 35 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 2493 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

BUK7208-40B,118 FAQ

1.How can I place an order for BUK7208-40B,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK7208-40B,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 BUK7208-40B,118 reliable?

The price and inventory of BUK7208-40B,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK7208-40B,118 is usually 5 days.

3.What payment methods are accepted for BUK7208-40B,118?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK7208-40B,118 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK7208-40B,118?

BUK7208-40B,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK7208-40B,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 BUK7208-40B,118?

For technical support, including BUK7208-40B,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK7208-40B,118 requirements.

6.How does Aetrix verify that BUK7208-40B,118 is sourced from the original manufacturer or authorized distributors?

All BUK7208-40B,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 BUK7208-40B,118 meets industry standards.

7.What is the process for return or replacement of BUK7208-40B,118?

All BUK7208-40B,118 units undergo pre-shipment inspection (PSI). If there is an issue with BUK7208-40B,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 BUK7208-40B,118 part is unused and in its original packaging.

Return procedure for BUK7208-40B,118:

1.Submit a request within 90 days.

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

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