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

NXP Semiconductors BUK9237-55A/C1,118

Name: BUK9237-55A/C1,118
Brand: NXP Semiconductors
SKU: BUK9237-55A/C1,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK9237-55A/C1,118

Manufacturer:: NXP Semiconductors

Category:: FETs, MOSFETs

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

Datasheet:: BUK9237-55A/C1,118.pdf

Description:: MOSFET N-CH 55V 32A DPAK

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Product details

Overview

BUK9237-55A/C1,118 from Nexperia is a logic-level N-channel TrenchMOS FET designed for automotive power switching, featuring 55 V V_DS, 32 A continuous drain current at T_mb = 25 °C, 28 mΩ R_DS(on) at V_GS = 10 V and T_j = 25 °C, 175 °C maximum junction temperature, and AEC-Q101 qualification for critical vehicle systems.

For engineers reviewing the BUK9237-55A/C1,118 datasheet, BUK9237-55A/C1,118 pinout, BUK9237-55A/C1,118 application, or BUK9237-55A/C1,118 equivalent, this page delivers verified electrical specs, thermal performance data, DPAK (SOT428) package details, gate-drive compatibility with 4.5–5 V logic sources, and validated alternatives for 12 V/24 V automotive load control.

Technical Context

This device uses TrenchMOS technology to achieve low on-state resistance while maintaining robust avalanche ruggedness (76 mJ unclamped), enabling reliable operation in thermally demanding environments. Its gate threshold voltage (V_GS(th)) ranges from 0.5 V to 2.3 V across -55 °C to 175 °C, ensuring stable turn-on behavior under wide temperature excursions.

The integrated source-drain diode supports freewheeling in inductive loads, with 0.85 V typical forward voltage at 15 A and 25 °C, and 42 ns reverse recovery time. Dynamic parameters-including 9.2 nC Q_GD, 17.6 nC Q_G(tot), and 927 pF C_iss-are specified at V_DS = 44 V, ID = 15 A, and T_j = 25 °C for accurate switching loss estimation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	55 V maximum drain-source voltage - defines safe blocking capability in 12 V/24 V automotive systems with transient spikes up to 55 V.
I_D (continuous)	32 A at T_mb = 25 °C - enables high-current switching of motors, lamps, and solenoids without external heatsinking in moderate ambient conditions.
R_DS(on)	28 mΩ typ. at V_GS = 10 V, T_j = 25 °C - minimizes conduction losses and self-heating during sustained load operation.
T_j max	175 °C - supports operation in engine bay and under-hood locations where ambient temperatures exceed 125 °C.
Avalanche energy	76 mJ (unclamped, non-repetitive) - provides single-pulse robustness against inductive kickback in motor and relay drive applications.
Q_G(tot)	17.6 nC - determines gate driver current requirement and switching speed when driven from 5 V logic sources.
R_th(j-mb)	1.94 K/W - quantifies thermal path efficiency from die to mounting base, critical for PCB copper area design and heatsink interface planning.

Pinout & Package

Package: DPAK (SOT428), plastic single-ended surface-mounted package with 3 leads (lead 2 cropped); mounting base electrically connected to drain for low-inductance thermal and power path.

Pin/Terminal	Circuit Role	Design Meaning
1	G (gate)	Control terminal accepting 4.5–15 V logic-level drive; low input capacitance enables fast switching with standard microcontroller GPIOs.
2	D (drain)[1]	High-side power output node; physically inaccessible due to lead cropping but internally bonded to mounting base for direct thermal coupling.
3	S (source)	Reference node for gate drive and current sensing; connects to system ground or low-side return path in high-side configurations.
Mounting base (mb)	Drain (D)	Primary thermal and electrical connection point - must be soldered to ≥200 mm² copper pour for rated 77 W power dissipation at T_mb = 25 °C.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive safety-critical applications including body control modules and power distribution units.
Logic-level gate drive	Guaranteed turn-on with 4.5 V supply - eliminates need for gate driver ICs in 5 V MCU-based designs.
175 °C junction rating	Enables uninterrupted operation in under-hood environments where ambient exceeds 125 °C and thermal derating is minimal.
Low R_DS(on) at 5 V	31–37 mΩ typ. at V_GS = 5 V, T_j = 25 °C - ensures efficient conduction even with marginal gate drive voltage.
Integrated source-drain diode	0.85 V V_SD at 15 A enables passive freewheeling in DC motor and solenoid circuits without external flyback diodes.

Applications

Automotive Body Control Module	12 V/24 V Lamp Driver
Use Scenario: Switching interior lighting, door locks, and window lift motors in modern vehicle ECUs. IC Role / Device Role / Timing Role: High-side power switch controlling load current with PWM dimming capability. Use Value: Low R_DS(on) reduces heat generation in densely packed modules; AEC-Q101 compliance ensures long-term reliability over 15-year vehicle lifetimes.	Use Scenario: Driving halogen and LED headlamps, fog lights, and brake lamps in OEM lighting systems. IC Role / Device Role / Timing Role: Robust load switch handling inrush currents up to 129 A peak and thermal cycling from -40 °C to +125 °C ambient. Use Value: 175 °C T_j rating prevents thermal shutdown during sustained high-brightness operation; avalanche energy withstands lamp filament cold-resistance surges.
Engine Bay Solenoid Control	Industrial 24 V DC Motor Starter
Use Scenario: Actuating fuel injectors, EGR valves, and turbocharger vanes in proximity to hot exhaust manifolds. IC Role / Device Role / Timing Role: Fast-switching power stage interfacing with CAN/LIN-controlled microcontrollers. Use Value: 42 ns t_rr and 9.2 nC Q_GD enable precise pulse-width control; mounting base connection simplifies thermal management in space-constrained enclosures.	Use Scenario: Starting small DC motors in factory automation equipment powered from 24 V industrial rails. IC Role / Device Role / Timing Role: Solid-state replacement for electromechanical relays in PLC I/O modules and motor starters. Use Value: 77 W P_tot at T_mb = 25 °C allows higher duty-cycle operation than standard MOSFETs; 32 A I_D supports motors up to 500 W without parallel devices.

Automotive Body Control Module

12 V/24 V Lamp Driver

Use Scenario: Switching interior lighting, door locks, and window lift motors in modern vehicle ECUs.

IC Role / Device Role / Timing Role: High-side power switch controlling load current with PWM dimming capability.

Use Value: Low R_DS(on) reduces heat generation in densely packed modules; AEC-Q101 compliance ensures long-term reliability over 15-year vehicle lifetimes.

Use Scenario: Driving halogen and LED headlamps, fog lights, and brake lamps in OEM lighting systems.

IC Role / Device Role / Timing Role: Robust load switch handling inrush currents up to 129 A peak and thermal cycling from -40 °C to +125 °C ambient.

Use Value: 175 °C T_j rating prevents thermal shutdown during sustained high-brightness operation; avalanche energy withstands lamp filament cold-resistance surges.

Engine Bay Solenoid Control

Industrial 24 V DC Motor Starter

Use Scenario: Actuating fuel injectors, EGR valves, and turbocharger vanes in proximity to hot exhaust manifolds.

IC Role / Device Role / Timing Role: Fast-switching power stage interfacing with CAN/LIN-controlled microcontrollers.

Use Value: 42 ns t_rr and 9.2 nC Q_GD enable precise pulse-width control; mounting base connection simplifies thermal management in space-constrained enclosures.

Use Scenario: Starting small DC motors in factory automation equipment powered from 24 V industrial rails.

IC Role / Device Role / Timing Role: Solid-state replacement for electromechanical relays in PLC I/O modules and motor starters.

Use Value: 77 W P_tot at T_mb = 25 °C allows higher duty-cycle operation than standard MOSFETs; 32 A I_D supports motors up to 500 W without parallel devices.

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
STL220N4LF8AG	40 V V_DS, 220 A I_D, TO-220FP package, 1.2 mΩ R_DS(on) - higher current, lower voltage, larger footprint.	Targeted at high-power 12 V starter motors and battery disconnects, not suitable for 24 V systems requiring 55 V blocking.	Select only if 40 V rating suffices and TO-220FP mechanical fit and thermal interface are acceptable.
ON Semiconductor NTMFS5C670NL	60 V V_DS, 30 A I_D, SO-8FL package, 4.5 mΩ R_DS(on) at 10 V - lower R_DS(on), smaller package, no mounting base.	Optimized for compact consumer-grade power supplies; lacks AEC-Q101 qualification and 175 °C rating for automotive use.	Use only in non-automotive, thermally benign applications where 60 V margin and ultra-low on-resistance outweigh qualification requirements.

Compared with BUK9237-55A/C1,118, STL220N4LF8AG offers higher current capacity but sacrifices 24 V system compatibility and automotive qualification, while NTMFS5C670NL delivers superior R_DS(on) in a smaller footprint yet omits critical automotive reliability features - making BUK9237-55A/C1,118 the sole choice for AEC-Q101–mandated 12 V/24 V load switching.

Availability

BUK9237-55A/C1,118 is available at Aetrix Electronics and suitable for automotive body control modules, 12 V/24 V lamp drivers, and engine bay solenoid control requiring stable component supply across extended production lifecycles.

Supply support for BUK9237-55A/C1,118 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 essential semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer markets.

BUK9237-55A/C1,118 belongs to Nexperia's TrenchMOS logic-level power FET product line, engineered specifically for robust, high-efficiency switching in automotive power distribution and load control systems.

FAQ

What is the maximum gate-source voltage rating for BUK9237-55A/C1,118?

The BUK9237-55A/C1,118 has a maximum gate-source voltage (V_GS) rating of ±15 V, as defined in the Absolute Maximum Ratings table. Exceeding this limit risks permanent gate oxide damage. For reliable operation, gate drive should remain within -15 V to +15 V, with recommended steady-state drive at 4.5 V to 10 V. The BUK9237-55A/C1,118 exhibits stable threshold behavior across temperature, supporting robust logic-level interfacing.

Is BUK9237-55A/C1,118 qualified for automotive applications?

Yes, BUK9237-55A/C1,118 is AEC-Q101 qualified and explicitly designed for automotive critical applications, including body control modules and power distribution units. Its 175 °C junction temperature rating, 76 mJ avalanche energy, and qualification testing per IEC 60134 ensure reliability in harsh under-hood environments. The BUK9237-55A/C1,118 meets automotive-grade requirements for thermal cycling, humidity resistance, and long-term operational stability.

What is the thermal resistance from junction to mounting base for BUK9237-55A/C1,118?

The thermal resistance from junction to mounting base (R_th(j-mb)) for BUK9237-55A/C1,118 is 1.94 K/W, measured under specified test conditions. This value reflects the dominant thermal path in DPAK (SOT428) packages, where the mounting base is directly connected to the drain and serves as the primary heat transfer interface. Proper soldering to ≥200 mm² copper area is required to achieve the rated 77 W total power dissipation at T_mb = 25 °C. The BUK9237-55A/C1,118 relies on this low R_th for effective thermal management in high-power automotive switching.

Can BUK9237-55A/C1,118 be driven directly by a 3.3 V microcontroller GPIO?

No, BUK9237-55A/C1,118 is not guaranteed to fully enhance with 3.3 V gate drive. Its R_DS(on) is specified at 31–37 mΩ minimum at V_GS = 5 V, and gate threshold voltage (V_GS(th)) ranges from 0.5 V to 2.3 V - meaning 3.3 V may yield significantly higher on-resistance and excessive heating. The BUK9237-55A/C1,118 requires ≥4.5 V for reliable logic-level operation; use with 3.3 V controllers necessitates a level-shifting gate driver or voltage booster circuit.

What is the drain-source breakdown voltage of BUK9237-55A/C1,118 at elevated temperature?

The drain-source breakdown voltage (V_(BR)DSS) of BUK9237-55A/C1,118 is 55 V minimum at T_j = 25 °C and 50 V minimum at T_j = -55 °C. At high temperature, V_(BR)DSS increases slightly due to positive temperature coefficient of breakdown - though the datasheet does not specify a maximum value at 175 °C, the device remains rated for 55 V operation across its full -55 °C to +175 °C junction range. The BUK9237-55A/C1,118 maintains safe blocking capability even under worst-case thermal stress.

BUK9237-55A/C1,118 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: TrenchMOS™

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 55 V

Current - Continuous Drain (Id) @ 25°C:: 32A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 4.5V, 10V

Rds On (Max) @ Id, Vgs:: 33mOhm @ 15A, 10V

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

Gate Charge (Qg) (Max) @ Vgs:: 17.6 nC @ 5 V

Vgs (Max):: ±15V

Input Capacitance (Ciss) (Max) @ Vds:: 1236 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 77W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

BUK9237-55A/C1,118 FAQ

1.How can I place an order for BUK9237-55A/C1,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK9237-55A/C1,118 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 BUK9237-55A/C1,118 reliable?

The price and inventory of BUK9237-55A/C1,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9237-55A/C1,118 is usually 5 days.

3.What payment methods are accepted for BUK9237-55A/C1,118?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK9237-55A/C1,118 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK9237-55A/C1,118?

BUK9237-55A/C1,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK9237-55A/C1,118 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 BUK9237-55A/C1,118?

For technical support, including BUK9237-55A/C1,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9237-55A/C1,118 requirements.

6.How does Aetrix verify that BUK9237-55A/C1,118 is sourced from the original manufacturer or authorized distributors?

All BUK9237-55A/C1,118 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 BUK9237-55A/C1,118 meets industry standards.

7.What is the process for return or replacement of BUK9237-55A/C1,118?

All BUK9237-55A/C1,118 units undergo pre-shipment inspection (PSI). If there is an issue with BUK9237-55A/C1,118, 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 BUK9237-55A/C1,118 part is unused and in its original packaging.

Return procedure for BUK9237-55A/C1,118:

1.Submit a request within 90 days.

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

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