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

Nexperia USA Inc. BUK954R2-55B,127

Name: BUK954R2-55B,127
Brand: Nexperia USA Inc.
SKU: BUK954R2-55B,127
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK954R2-55B,127

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: BUK954R2-55B,127.pdf

Description:: MOSFET N-CH 55V 75A TO220AB

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Product details

Overview

BUK954R2-55B from NXP Semiconductors is a logic-level N-channel TrenchMOS FET in TO-220AB (SOT78) package, rated for 55 V V_DS, 75 A continuous drain current at T_mb = 25 °C, and 3.5 mΩ typical R_DS(on) at V_GS = 5 V and T_j = 25 °C. It is AEC-Q101 qualified and designed for automotive 12 V/24 V load switching in thermally demanding environments up to 175 °C junction temperature.

For engineers reviewing the BUK954R2-55B datasheet, BUK954R2-55B pinout, BUK954R2-55B application, or BUK954R2-55B equivalent, key selection criteria include logic-level gate drive compatibility (V_GS(th) = 1.1–2.0 V), low R_DS(on) at 5 V drive, avalanche ruggedness (1.2 J unclamped), thermal resistance (0.5 K/W j-to-mb), and automotive qualification status.

Technical Context

This device uses NXP's TrenchMOS technology to achieve low on-state resistance with logic-level gate drive capability-enabling direct interface with 3.3 V or 5 V microcontrollers without level-shifting. Its mounting base (pin 2) is electrically connected to the drain, requiring isolation when heatsink-mounted.

The FET supports high peak currents (765 A pulsed) and features robust unclamped inductive switching performance (EDS(AL)S = 1.2 J), with dynamic parameters including Q_GD = 37 nC and C_iss = 7665 pF at V_DS = 25 V, supporting fast switching in motor and solenoid control circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	55 V maximum - defines absolute upper limit for drain-source voltage in automotive 24 V systems with load dump transients.
R_DS(on)	3.5 mΩ typ @ V_GS = 5 V, I_D = 25 A, T_j = 25 °C - enables <1 W conduction loss at 50 A, critical for thermal management in enclosed modules.
I_D (cont)	75 A @ T_mb = 25 °C - package-limited continuous current, scalable down to 75 A at T_mb = 100 °C per Figure 1.
T_j max	175 °C - extended junction rating allows operation in under-hood automotive environments without derating penalties seen in 150 °C parts.
R_th(j-mb)	0.5 K/W - thermal resistance from junction to mounting base confirms efficient heat transfer to external heatsink, enabling high-power switching in compact layouts.
Q_GD	37 nC - gate-drain charge value directly impacts Miller-induced switching losses and EMI during hard-switching in motor drives.
V_GS(th)	1.1–2.0 V @ I_D = 1 mA - ensures reliable turn-on with standard logic-level MCU GPIOs, eliminating need for gate drivers in many 12 V applications.

Pinout & Package

TO-220AB (SOT78) plastic single-ended package with heatsink mounting base; 3 leads; mounting hole centered on drain-connected base.

Pin/Terminal	Circuit Role	Design Meaning
1 (G)	Gate	Control terminal; accepts logic-level input (3.3 V/5 V); requires ≤15 V absolute max rating.
2 (D / mb)	Drain / Mounting Base	Main power path output; electrically tied to heatsink mounting surface-requires electrical isolation from chassis ground.
3 (S)	Source	Power return path; referenced to system ground; used for current sensing and gate drive reference.

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	V_GS(th) range (1.1–2.0 V) and full enhancement at 5 V enable direct MCU interface-reducing BOM count and PCB area.
175 °C junction rating	Supports sustained operation in high-ambient under-hood locations without thermal shutdown or accelerated aging.
Low R_DS(on) at 5 V	3.5 mΩ typical at V_GS = 5 V reduces conduction loss by >30% vs. comparable 10 V gate devices driven from same MCU rail.
Avalanche ruggedness	1.2 J unclamped energy rating allows safe operation during inductive load turn-off without external snubbers in solenoid/motor circuits.

Applications

Automotive Body Control Module (BCM)

12 V/24 V Starter Solenoid Driver

Use Scenario: High-side switching of door locks, seat heaters, and lighting loads in modern BCMs with 5 V MCU supervision.

IC Role / Device Role: Power switch controlling up to 75 A resistive/inductive loads; gate driven directly from MCU GPIO.

Use Value: Eliminates need for discrete level shifters or gate drivers, reducing component count and improving system reliability over temperature.

Use Scenario: Driving starter solenoid coils in 12 V passenger vehicles, where fast, robust turn-on is required during cranking.

IC Role / Device Role: Low-side or high-side power switch handling pulsed 765 A peaks during engagement, with integrated avalanche energy absorption.

Use Value: Withstands repeated unclamped inductive kickback without external protection, simplifying layout and enhancing long-term field reliability.

Electric Power Steering (EPS) Motor Phase Switch

Commercial Vehicle 24 V Lamp & Horn Control

Use Scenario: Half-bridge phase leg in brushless EPS motor controllers operating in under-hood ambient up to 125 °C.

IC Role / Device Role: High-current, high-temperature MOSFET delivering 75 A continuous current with R_DS(on) stable up to 175 °C junction.

Use Value: Maintains low conduction loss across full automotive temperature range, minimizing thermal runaway risk in sealed motor housings.

Use Scenario: Centralized power distribution for headlamps, fog lamps, and air horns in heavy-duty trucks with 24 V nominal systems.

IC Role / Device Role: Load switch managing multiple 24 V loads simultaneously, leveraging 55 V V_DS margin for ISO 7637-2 pulse suppression.

Use Value: 55 V rating accommodates 24 V system transients up to ±100 V, ensuring immunity to load dump events without additional clamping.

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
STL220N5LF5AG	60 V V_DS, 220 A I_D, 2.2 mΩ R_DS(on) @ 10 V; requires 10 V gate drive for rated R_DS(on); no AEC-Q101 listing in public documentation.	Higher current capacity but lacks automotive qualification; suitable for industrial 24 V motor drives where qualification is not mandated.	Select only if gate drive rail ≥10 V is available and AEC-Q101 compliance is not required.
ON Semiconductor NTMFS5C670NL	60 V V_DS, 120 A I_D, 3.0 mΩ R_DS(on) @ 10 V; AEC-Q101 qualified; SO-8FL package (surface-mount, lower thermal mass).	SO-8FL footprint limits power dissipation to ~100 W; unsuitable for 300 W continuous operation without forced cooling.	Prefer for space-constrained PCBs with moderate power needs (<100 W); avoid for TO-220AB-replacement thermal requirements.

Compared with STL220N5LF5AG and NTMFS5C670NL, the BUK954R2-55B uniquely balances AEC-Q101 compliance, 5 V logic-level drive, 300 W dissipation in TO-220AB, and 175 °C operation-making it the only drop-in solution for thermally demanding, qualified automotive high-side switching where gate voltage is constrained to 5 V.

Availability

BUK954R2-55B is available at Aetrix Electronics and suitable for automotive body control modules, 12 V/24 V starter solenoid drivers, and electric power steering motor phase switches requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for BUK954R2-55B 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.

This device belongs to NXP's TrenchMOS logic-level power FET product line, engineered specifically for automotive-grade high-current switching where direct MCU interfacing, thermal resilience, and AEC-Q101 reliability are mandatory.

FAQ

Is BUK954R2-55B suitable for high-side switching configurations?

Yes-it supports high-side switching when used with appropriate gate drive circuitry that provides V_GS ≥ 5 V relative to the source. The mounting base (pin 2) is connected to the drain, so electrical isolation between heatsink and system ground is mandatory in high-side implementations to prevent shorting.

What is the maximum allowable gate-source voltage for reliable operation?

The absolute maximum V_GS is ±15 V per the datasheet limiting values table. Operation above +15 V or below −15 V risks permanent gate oxide damage. For robust design, gate drive should be clamped to +12 V / −5 V using Zener diodes or dedicated gate driver ICs.

Does BUK954R2-55B include an integrated body diode, and what are its characteristics?

Yes-the device includes a parasitic source-drain diode with V_SD = 0.85 V typical at I_S = 40 A and T_j = 25 °C, and reverse recovery time t_rr = 78 ns. This diode supports freewheeling in inductive loads but is not optimized for synchronous rectification due to relatively high forward voltage and recovery charge (Q_r = 171 nC).

How does thermal resistance change when mounted on a heatsink versus free-air conditions?

R_th(j-mb) is fixed at 0.5 K/W (junction-to-mounting-base), but total thermal resistance depends on heatsink interface. In free-air, R_th(j-a) is 60 K/W-limiting P_tot to ~4 W. With a 1 K/W heatsink and thermal interface material, total R_th(j-a) drops to ~1.5 K/W, enabling full 300 W dissipation at T_mb = 25 °C per Figure 2.

BUK954R2-55B,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):: 55 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:: 3.7mOhm @ 25A, 10V

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

Gate Charge (Qg) (Max) @ Vgs:: 95 nC @ 5 V

Vgs (Max):: ±15V

Input Capacitance (Ciss) (Max) @ Vds:: 10220 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 300W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AB

BUK954R2-55B,127 FAQ

1.How can I place an order for BUK954R2-55B,127 through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK954R2-55B,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 BUK954R2-55B,127 reliable?

The price and inventory of BUK954R2-55B,127 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK954R2-55B,127 is usually 5 days.

3.What payment methods are accepted for BUK954R2-55B,127?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK954R2-55B,127 transactions.

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4.How is shipping managed for BUK954R2-55B,127?

BUK954R2-55B,127 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK954R2-55B,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 BUK954R2-55B,127?

For technical support, including BUK954R2-55B,127 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK954R2-55B,127 requirements.

6.How does Aetrix verify that BUK954R2-55B,127 is sourced from the original manufacturer or authorized distributors?

All BUK954R2-55B,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 BUK954R2-55B,127 meets industry standards.

7.What is the process for return or replacement of BUK954R2-55B,127?

All BUK954R2-55B,127 units undergo pre-shipment inspection (PSI). If there is an issue with BUK954R2-55B,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 BUK954R2-55B,127 part is unused and in its original packaging.

Return procedure for BUK954R2-55B,127:

1.Submit a request within 90 days.

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

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