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

Nexperia USA Inc. BUK7508-40B,127

Name: BUK7508-40B,127
Brand: Nexperia USA Inc.
SKU: BUK7508-40B,127
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK7508-40B,127

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: BUK7508-40B,127.pdf

Description:: MOSFET N-CH 40V 75A TO220AB

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Product details

Overview

BUK7508-40B,127 from NXP Semiconductors is a standard-level N-channel TrenchMOS FET in TO-220AB (SOT78A) package, designed for automotive-critical 12 V power switching. It delivers 75 A continuous drain current at T_mb = 25 °C, features 6.6 mΩ typical R_DS(on) at V_GS = 10 V and T_j = 25 °C, supports 175 °C junction operation, and is AEC-Q101 qualified for under-hood motor, lamp, and solenoid control.

For engineers reviewing the BUK7508-40B,127 datasheet, BUK7508-40B,127 pinout, BUK7508-40B,127 application, or BUK7508-40B,127 equivalent, this device serves as a thermally robust, gate-drive-compatible MOSFET for high-current 12 V automotive loads where avalanche energy (241 mJ), low on-resistance, and mounting-base thermal resistance (0.95 K/W) are critical selection criteria.

Technical Context

This MOSFET employs TrenchMOS technology to achieve low conduction losses and stable threshold voltage (2–4 V) across -55 °C to 175 °C. Its gate drive is compatible with standard 10 V logic sources, eliminating need for level-shifting circuitry in 12 V systems.

The device integrates an intrinsic body diode with 0.85–1.2 V forward voltage at 25 A and exhibits controlled reverse recovery (t_rr = 53 ns, Q_r = 44 nC), enabling reliable commutation in inductive load switching. Thermal design centers on mounting base (connected to drain) for direct heatsink coupling.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V maximum - supports full 12 V automotive battery transients up to ISO 7637-2 Pulse 5a (clamped ~35 V) with margin.
I_D (cont)	75 A at T_mb = 25 °C - enables single-device control of high-power lamps, fans, or fuel pumps without parallel FETs.
R_DS(on)	6.6 mΩ typ @ V_GS = 10 V, T_j = 25 °C - yields ≤12.5 W conduction loss at 50 A, reducing heatsink size.
E_AS	241 mJ non-repetitive avalanche energy - withstands inductive kickback from solenoids or motors without external snubbers.
R_th(j-mb)	0.95 K/W - allows direct thermal path from die to heatsink, supporting >100 W dissipation with modest heatsinking.
Q_G(tot)	36 nC - enables fast switching with moderate gate driver strength (e.g., TC4427), minimizing switching losses at 20 kHz.
T_j max	175 °C - certified for under-hood environments including engine control modules and transmission valve bodies.

Pinout & Package

TO-220AB (SOT78A) plastic single-ended package with heatsink-mounted base; 3-lead configuration; mounting base electrically connected to drain terminal.

Pin/Terminal	Circuit Role	Design Meaning
1 (G)	Gate	Controls channel conduction; requires 10 V drive for full enhancement; gate leakage <100 nA ensures low standby current.
2 (D)	Drain	Main high-side power path; internally bonded to mounting base for thermal and electrical connection to heatsink.
3 (S)	Source	Power return node; referenced for gate drive; source inductance 7.5 nH affects high-speed switching stability.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive safety-critical applications including engine management and braking systems.
175 °C junction rating	Enables operation in high-ambient zones (e.g., near exhaust manifolds) without derating or forced cooling.
Low R_DS(on) drift with temperature	R_DS(on) increases only 2.3× from 25 °C to 175 °C (6.6 → 15.2 mΩ), maintaining predictable loss behavior.
Standard-level gate drive	Turns fully on with 10 V logic, compatible with microcontroller GPIO or automotive driver ICs like UJA1075.
Integrated avalanche ruggedness	241 mJ unclamped E_AS eliminates need for external TVS or clamping diodes in solenoid/motor drive circuits.

Applications

Engine Cooling Fan Control

Automotive Headlamp Switching

Use Scenario: PWM-controlled 12 V DC brushless fan in engine bay, subject to 125 °C ambient and ISO 16750-4 load dump.

IC Role / Device Role / Timing Role: High-side power switch handling 60 A peak, managing thermal cycling and inductive flyback.

Use Value: 0.95 K/W R_th(j-mb) and 175 °C rating allow direct bolt-on heatsink mounting without thermal interface pads, reducing BOM count.

Use Scenario: On/off switching of H7 halogen headlamps (55 W × 2) with soft-start via microcontroller PWM.

IC Role / Device Role / Timing Role: Low-loss power switch replacing electromechanical relay; handles 9 A steady-state + surge currents.

Use Value: 6.6 mΩ R_DS(on) limits conduction loss to <0.5 W, eliminating relay coil power and contact wear issues.

Fuel Injector Driver

Transmission Solenoid Valve Control

Use Scenario: Driving multi-point port fuel injectors (12 V, 1.5 Ω coil) with 2 ms pulse width at 10 Hz.

IC Role / Device Role / Timing Role: Fast-switching low-inductance switch managing 8 A peak current and 53 ns reverse recovery.

Use Value: 53 ns t_rr and 44 nC Q_r minimize cross-conduction loss during turn-off, improving injector timing accuracy.

Use Scenario: Controlling linear solenoid valves in 8-speed automatic transmissions, operating continuously at 100 °C case temperature.

IC Role / Device Role / Timing Role: Robust power switch handling 15 A DC with repeated 241 mJ avalanche events during gear shifts.

Use Value: AEC-Q101 qualification and 241 mJ E_AS ensure reliability over 10-year vehicle lifetime without field failures.

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, 2.2 mΩ, D²PAK; higher current but larger footprint and 150 °C T_j max.	Requires PCB copper area for thermal management; not TO-220 drop-in; suited for high-volume infotainment power rails.	Select when >100 A continuous current is needed and board space permits D²PAK layout.
IRF1404ZPBF	40 V, 184 A, 3.8 mΩ, TO-220AB; non-automotive grade, 175 °C rated but not AEC-Q101 qualified.	Lacks automotive qualification; unsuitable for safety-critical ECUs; acceptable for aftermarket accessories.	Choose only for non-safety applications where cost is primary and qualification is not mandated.

Compared with STL220N4F7AG and IRF1404ZPBF, the BUK7508-40B,127 uniquely balances AEC-Q101 compliance, TO-220AB mechanical compatibility, 75 A capability, and 0.95 K/W thermal resistance-making it optimal for space-constrained, thermally demanding automotive modules requiring zero qualification risk.

Availability

BUK7508-40B,127 is available at Aetrix Electronics and suitable for automotive engine control units, transmission control modules, and body electronics requiring stable component supply across extended vehicle lifecycles.

Supply support for BUK7508-40B,127 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

NXP Semiconductors is a Dutch semiconductor company specializing in secure connectivity solutions for automotive, industrial, and IoT markets, with deep expertise in power management and automotive qualification.

The BUK7508-40B belongs to NXP's TrenchMOS automotive power portfolio, engineered specifically for high-reliability 12 V load switching in harsh under-hood environments where AEC-Q101 compliance and thermal resilience are mandatory.

FAQ

Is BUK7508-40B,127 pin-compatible with other TO-220AB N-channel MOSFETs?

Yes-it follows standard TO-220AB pinout: Pin 1 = Gate, Pin 2 = Drain (mounting base), Pin 3 = Source. This matches industry-standard layouts used by STMicroelectronics, Infineon, and ON Semiconductor in equivalent packages, enabling mechanical and PCB footprint reuse.

What is the maximum safe operating temperature for continuous use?

The device is rated for continuous operation up to 175 °C junction temperature, validated per AEC-Q101 stress testing. At T_mb = 100 °C, continuous drain current remains 71 A, and thermal resistance from junction to mounting base is 0.95 K/W-enabling reliable use in engine compartment locations.

Does BUK7508-40B,127 require a gate resistor for automotive 12 V systems?

A gate resistor (typically 10–47 Ω) is recommended to dampen ringing caused by LS = 7.5 nH and stray inductance, especially in high-di/dt solenoid switching. The 36 nC total gate charge allows clean turn-on/turn-off with common microcontroller drivers when properly terminated.

Can this MOSFET replace an electromechanical relay in headlamp circuits?

Yes-its 75 A rating, 6.6 mΩ R_DS(on), and integrated body diode support direct replacement of 40 A SPST relays. It eliminates contact bounce, extends lifetime beyond 100,000 cycles, and enables PWM dimming without arcing, provided gate drive meets 10 V logic levels.

BUK7508-40B,127 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: TrenchMOS™

Package/Case:: TO-220-3

Packaging:: Tube

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:: 36 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 2689 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 157W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AB

BUK7508-40B,127 FAQ

1.How can I place an order for BUK7508-40B,127 through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK7508-40B,127 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 BUK7508-40B,127 reliable?

The price and inventory of BUK7508-40B,127 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK7508-40B,127 is usually 5 days.

3.What payment methods are accepted for BUK7508-40B,127?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK7508-40B,127 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK7508-40B,127?

BUK7508-40B,127 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK7508-40B,127 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 BUK7508-40B,127?

For technical support, including BUK7508-40B,127 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK7508-40B,127 requirements.

6.How does Aetrix verify that BUK7508-40B,127 is sourced from the original manufacturer or authorized distributors?

All BUK7508-40B,127 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 BUK7508-40B,127 meets industry standards.

7.What is the process for return or replacement of BUK7508-40B,127?

All BUK7508-40B,127 units undergo pre-shipment inspection (PSI). If there is an issue with BUK7508-40B,127, 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 BUK7508-40B,127 part is unused and in its original packaging.

Return procedure for BUK7508-40B,127:

1.Submit a request within 90 days.

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

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