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

Nexperia USA Inc. BUK954R4-40B,127

Name: BUK954R4-40B,127
Brand: Nexperia USA Inc.
SKU: BUK954R4-40B,127
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK954R4-40B,127

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: BUK954R4-40B,127.pdf

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

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Product details

Overview

BUK954R4-40B,127 from NXP Semiconductors is a logic-level N-channel TrenchMOS FET in TO-220AB (SOT78A) package, rated for 40 V V_DS, 75 A continuous drain current at T_mb = 25 °C, and 175 °C junction temperature. It delivers 3.9 mΩ R_DS(on) at V_GS = 5 V and T_j = 25 °C, enabling efficient 12 V automotive load switching with standard logic-level gate drive.

For engineers reviewing the BUK954R4-40B,127 datasheet, BUK954R4-40B,127 pinout, BUK954R4-40B,127 application, or BUK954R4-40B,127 equivalent, this part supports thermally demanding automotive power switching where AEC-Q101 qualification, low on-resistance, and robust avalanche energy (961 mJ) are critical selection criteria.

Technical Context

This device employs TrenchMOS technology to achieve low R_DS(on) while maintaining stable threshold voltage (V_GS(th) = 1.1–2.3 V across –55 to 175 °C) and high thermal resilience. Its gate charge profile (Q_G(tot) = 64 nC, Q_GD = 24 nC) enables fast switching with moderate gate drive strength.

The integrated source-drain diode exhibits V_SD = 0.85 V at I_S = 25 A and T_j = 25 °C, with t_rr = 70 ns and Q_r = 67 nC - supporting synchronous rectification and inductive load commutation in motor and solenoid drivers.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V maximum - supports 12 V automotive systems with margin against load-dump transients.
I_D (continuous)	75 A at T_mb = 25 °C - limited by TO-220AB package thermal capacity, not silicon.
R_DS(on)	3.9 mΩ typ at V_GS = 5 V, T_j = 25 °C - enables <1 W conduction loss at 25 A.
T_j max	175 °C - qualified for under-hood automotive environments without derating penalties.
E_AS	961 mJ non-repetitive avalanche energy - withstands unclamped inductive turn-off stress in motor/solenoid circuits.
Q_G(tot)	64 nC - compatible with standard 5 V microcontroller GPIO or dedicated gate drivers (e.g., TC4427).
R_th(j-mb)	0.59 K/W - enables direct heatsink mounting for high-power dissipation with minimal thermal interface resistance.

Pinout & Package

TO-220AB (SOT78A) plastic single-ended package with heatsink-mounted mounting base connected internally to the drain terminal. Requires mechanical mounting via screw through central hole; leads are tin-plated except for mounting base zone.

Pin/Terminal	Circuit Role	Design Meaning
1 (G)	Gate	Logic-level control input; accepts 4.5–5 V drive for full enhancement; V_GS rating ±15 V.
2 (D)	Drain	Main power output node; electrically tied to mounting base - must be isolated from heatsink unless system ground reference permits.
3 (S)	Source	Power return path; referenced to gate drive common; internal source bond pad inductance = 7.5 nH.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive safety-critical applications including engine control, body electronics, and ADAS power stages.
Logic-level gate drive	Turns fully on with 5 V V_GS; eliminates need for level-shifting circuitry in MCU-driven systems.
Low R_DS(on) at 5 V	3.9 mΩ typ ensures <0.5 W conduction loss at 15 A - reduces thermal design burden in compact modules.
175 °C junction rating	Enables operation in high-ambient environments (e.g., near exhaust, battery compartments) without external derating.
High avalanche ruggedness	961 mJ E_AS allows reliable handling of inductive kickback from motors, lamps, and solenoids without snubbers.

Applications

Automotive Body Control Module (BCM)

12 V Electric Power Steering (EPS) Auxiliary Loads

Use Scenario: Switching door locks, window lifters, and interior lighting in modern BCMs.

IC Role / Device Role / Timing Role: High-side or low-side power switch controlling resistive and inductive 12 V loads.

Use Value: AEC-Q101 compliance ensures long-term reliability; 3.9 mΩ R_DS(on) minimizes heat generation in densely packed PCBs.

Use Scenario: Driving auxiliary actuators (e.g., cooling fan, hydraulic pump solenoid) in EPS subsystems.

IC Role / Device Role / Timing Role: Robust power switch handling repetitive inductive turn-off events during steering assist cycles.

Use Value: 961 mJ avalanche energy absorbs unclamped inductive energy without failure, eliminating need for external TVS.

Off-Road Vehicle Lighting Systems

Commercial Truck HVAC Blower Control

Use Scenario: PWM-controlled LED headlamps and fog lamps exposed to wide ambient temperature swings.

IC Role / Device Role / Timing Role: Low-side switching element with fast turn-on/turn-off (t_d(on) = 44 ns, t_f = 132 ns) for precise dimming.

Use Value: 175 °C rating maintains performance at under-hood temperatures up to 125 °C ambient without derating.

Use Scenario: Controlling high-current DC blower motors in heavy-duty truck HVAC units.

IC Role / Device Role / Timing Role: High-current (75 A) power switch operating in thermally constrained metal enclosures.

Use Value: 0.59 K/W R_th(j-mb) enables direct heatsink coupling for >200 W power dissipation capability.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STL220N4F7AG	40 V, 220 A (T_c = 25 °C), R_DS(on) = 1.6 mΩ @ 10 V - requires higher gate drive voltage (10 V typical) for optimal R_DS(on).	Higher current capacity but less suitable for 5 V-only MCU drive; better for high-efficiency, high-power industrial inverters.	Select when gate drive can supply ≥10 V and peak current exceeds 75 A; avoid if 5 V logic compatibility is mandatory.
IRFB4115PBF	150 V, 115 A, R_DS(on) = 6.5 mΩ @ 10 V - higher voltage rating but higher on-resistance and no AEC-Q101 qualification.	Designed for industrial UPS and power supplies; lacks automotive qualification and thermal ruggedness at 175 °C.	Choose only for non-automotive 12–48 V systems requiring higher V_DS margin; not recommended for automotive OEM use.

Compared with STL220N4F7AG and IRFB4115PBF, BUK954R4-40B,127 uniquely balances 5 V logic compatibility, AEC-Q101 qualification, and 175 °C operation - making it the only option among the three validated for thermally aggressive automotive body electronics with MCU-native gate drive.

Availability

BUK954R4-40B,127 is available at Aetrix Electronics and suitable for automotive body control modules, 12 V electric power steering auxiliary loads, and commercial vehicle lighting systems requiring stable component supply across multi-year production cycles.

Supply support for BUK954R4-40B,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 global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

BUK954R4-40B,127 belongs to NXP's TrenchMOS automotive logic-level power MOSFET product line, engineered specifically for high-reliability, thermally demanding 12 V automotive power switching where AEC-Q101 compliance and robust avalanche performance are mandatory.

FAQ

Is BUK954R4-40B,127 suitable for high-side switching configurations?

Yes - its TO-220AB package connects the mounting base to the drain, enabling straightforward high-side implementation when the heatsink is electrically isolated. Gate drive must be referenced to the source (floating), requiring either an isolated gate driver or bootstrap circuitry for continuous operation above 5 V supply rails.

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

Per Figure 1 in the datasheet, the continuous drain current is 75 A at T_mb = 100 °C - capped by package limitation, not silicon. This value remains constant from 25 °C to 100 °C mounting base temperature before linear derating begins beyond 100 °C.

Does BUK954R4-40B,127 require a gate resistor for safe switching?

A gate resistor (typically 10–47 Ω) is recommended to damp ringing and limit peak gate current. The datasheet specifies R_G(ext) = 10 Ω for dynamic characterization (e.g., t_d(on), t_f). Omitting it risks oscillation and EMI, especially with high-speed MCU GPIO driving long PCB traces.

Can BUK954R4-40B,127 replace older NXP BUK95xx devices in existing designs?

Yes - BUK954R4-40B,127 is a direct replacement for earlier revisions (e.g., Rev. 02) with identical pinout, electrical specs, and package. The Rev. 03 datasheet confirms no parametric or mechanical changes; only documentation formatting was updated per NXP identity guidelines.

BUK954R4-40B,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):: 4.5V, 10V

Rds On (Max) @ Id, Vgs:: 4mOhm @ 25A, 10V

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

Gate Charge (Qg) (Max) @ Vgs:: 64 nC @ 5 V

Vgs (Max):: ±15V

Input Capacitance (Ciss) (Max) @ Vds:: 7124 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 254W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AB

BUK954R4-40B,127 FAQ

1.How can I place an order for BUK954R4-40B,127 through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK954R4-40B,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 BUK954R4-40B,127 reliable?

The price and inventory of BUK954R4-40B,127 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK954R4-40B,127 is usually 5 days.

3.What payment methods are accepted for BUK954R4-40B,127?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK954R4-40B,127 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK954R4-40B,127?

BUK954R4-40B,127 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK954R4-40B,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 BUK954R4-40B,127?

For technical support, including BUK954R4-40B,127 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK954R4-40B,127 requirements.

6.How does Aetrix verify that BUK954R4-40B,127 is sourced from the original manufacturer or authorized distributors?

All BUK954R4-40B,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 BUK954R4-40B,127 meets industry standards.

7.What is the process for return or replacement of BUK954R4-40B,127?

All BUK954R4-40B,127 units undergo pre-shipment inspection (PSI). If there is an issue with BUK954R4-40B,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 BUK954R4-40B,127 part is unused and in its original packaging.

Return procedure for BUK954R4-40B,127:

1.Submit a request within 90 days.

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

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