Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Nexperia USA Inc. BUK9277-55A,118

Name: BUK9277-55A,118
Brand: Nexperia USA Inc.
SKU: BUK9277-55A,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BUK9277-55A,118

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

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

Datasheet:: BUK9277-55A,118.pdf

Description:: MOSFET N-CH 55V 18A DPAK

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,451

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BUK9277-55A from Nexperia is an AEC-Q101-qualified N-channel TrenchMOS logic-level power MOSFET in DPAK (SOT428) package, rated for 55 V V_DS, 18 A continuous drain current at T_mb = 25 °C, 65 mΩ R_DS(on) at V_GS = 5 V and T_j = 25 °C, and 175 °C maximum junction temperature - deployed in automotive 12 V/24 V load switching circuits including solenoids and lamps.

For engineers reviewing the BUK9277-55A datasheet, BUK9277-55A pinout, BUK9277-55A application, or BUK9277-55A equivalent, this page delivers verified electrical parameters, thermal behavior, gate-drive compatibility with 4.5 V–5 V logic sources, avalanche ruggedness (33 mJ), and mounting-base thermal resistance (2.93 K/W) to support robust automotive power design validation.

Technical Context

This device uses TrenchMOS technology to achieve low R_DS(on) with logic-level gate drive compatibility - enabling direct interface with 5 V microcontrollers without level-shifting. Its 175 °C rated junction temperature and Q101 qualification confirm suitability for under-hood automotive environments where thermal cycling and reliability are critical.

The integrated source-drain diode exhibits 0.85 V forward voltage at 15 A and 25 °C, with 33 ns reverse recovery time and 60 nC recovered charge - supporting moderate-frequency switching in inductive load control. Avalanche energy rating (33 mJ unclamped) provides single-pulse fault tolerance during inductive turn-off transients.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	55 V - Maximum drain-source blocking voltage; defines safe operation in 24 V automotive systems with load-dump margin.
I_D (continuous)	18 A at T_mb = 25 °C - Continuous current capability when mounted on a PCB copper area providing adequate thermal conduction.
R_DS(on)	65 mΩ max at V_GS = 5 V, T_j = 25 °C - Ensures <1.2 W conduction loss at 14 A, enabling efficient thermal management in space-constrained modules.
E_AS	33 mJ unclamped - Single-pulse avalanche energy rating; supports reliable operation during inductive load interruption without external snubbers.
R_th(j-mb)	2.93 K/W - Junction-to-mounting-base thermal resistance; enables accurate junction temperature estimation using measured heatsink/base temperature.
Q_G(tot)	11 nC - Total gate charge; determines gate driver current requirement (~1.1 A peak for 10 ns rise time) and switching loss trade-offs.
V_GS(th)	1.0–2.0 V typ at T_j = 25 °C - Low threshold ensures full enhancement with standard 3.3 V/5 V logic outputs, reducing risk of partial turn-on.

Pinout & Package

DPAK (SOT428) plastic surface-mount package with exposed mounting base thermally and electrically connected to the drain terminal. Package dimensions: 6.73 mm × 4.45 mm × 2.55 mm (L × W × H), with 3 leads (lead 2 cropped).

Pin/Terminal	Circuit Role	Design Meaning
1	G (Gate)	Control terminal; accepts 4.5 V–15 V logic-compatible drive; requires <100 nA leakage current at ±15 V.
2	D (Drain)	Main current path input; electrically and thermally tied to mounting base; handles up to 55 V and 73 A pulsed current.
3	S (Source)	Current return path and reference node for gate drive; forms cathode of integrated body diode.
mb	Mounting Base	Exposed copper pad soldered to PCB thermal plane; serves as drain connection and primary heat dissipation path (R_th(j-mb) = 2.93 K/W).

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	Full enhancement at V_GS = 4.5 V enables direct MCU GPIO control without external level shifters or gate drivers.
175 °C junction rating	Supports sustained operation in high-ambient under-hood locations (e.g., near exhaust manifolds or alternators).
Integrated body diode	Low V_SD (0.85 V @ 15 A) and fast trr (33 ns) reduce freewheeling losses in relay/solenoid drive circuits.
Unclamped avalanche ruggedness	33 mJ rating allows safe handling of inductive kickback without external clamping components in 12 V/24 V systems.

Applications

Automotive Lamp Control

Engine Control Solenoid Drive

Use Scenario: Switching halogen and LED headlamps, fog lamps, and interior lighting in modern vehicle architectures.

IC Role / Device Role / Timing Role: High-side or low-side power switch controlling 12 V/24 V lamp loads with PWM dimming capability.

Use Value: 65 mΩ R_DS(on) limits conduction loss to <1.3 W at 16 A, minimizing thermal stress on PCB traces and connectors.

Use Scenario: Driving fuel injectors, EGR valves, turbocharger actuators, and transmission solenoids in engine management systems.

IC Role / Device Role / Timing Role: Low-side switch interfacing with microcontroller PWM outputs to regulate solenoid current and timing.

Use Value: 33 mJ avalanche energy absorbs inductive flyback during rapid de-energization, eliminating need for discrete TVS or Zener clamps.

12 V/24 V Motor Control

Body Electronics Power Distribution

Use Scenario: Controlling small DC motors in power windows, seat adjusters, HVAC blowers, and mirror actuators.

IC Role / Device Role / Timing Role: Bidirectional or unidirectional motor driver stage with integrated freewheeling path via body diode.

Use Value: 33 ns reverse recovery time and 60 nC Q_r minimize switching losses and voltage overshoot during motor commutation.

Use Scenario: Solid-state replacement for mechanical relays in central power distribution units (PDUs) and junction boxes.

IC Role / Device Role / Timing Role: Load switch managing power to subsystems like infotainment, telematics, and ADAS sensors.

Use Value: Q101 qualification and 175 °C rating ensure long-term reliability across vehicle lifecycle under thermal cycling and vibration stress.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STL220N4LF6AG	40 V V_DS, 220 A pulsed, 1.2 mΩ R_DS(on) at 10 V - higher current, lower voltage, different package (PowerFLAT 5x6).	Not suitable for 55 V systems; better for high-current 12 V battery-fed motor drives requiring ultra-low R_DS(on).	Select only if system V_DS ≤ 40 V and board layout accommodates larger thermal pad and higher gate charge (32 nC).
IRLR024NPBF	55 V V_DS, 17 A I_D, 60 mΩ R_DS(on) at 10 V - non-automotive grade, no AEC-Q101, TO-220AB package.	Lacks automotive qualification and thermal performance (R_th(j-a) > 60 K/W); unsuitable for under-hood deployment.	Acceptable only for non-automotive industrial prototypes where qualification and thermal efficiency are not required.

Compared with STL220N4LF6AG and IRLR024NPBF, BUK9277-55A uniquely balances 55 V rating, AEC-Q101 compliance, DPAK thermal efficiency (2.93 K/W), and 5 V logic compatibility - making it the only drop-in solution for production automotive 12 V/24 V load switching where reliability and space constraints coexist.

Availability

BUK9277-55A is available at Aetrix Electronics and suitable for automotive lamp control, engine solenoid actuation, and 12 V/24 V motor drive applications requiring stable component supply, long-lifecycle support, and traceable sourcing for Tier-1 OEM programs.

Supply support for BUK9277-55A 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 specializing in high-volume, high-reliability discrete and logic devices, with deep expertise in automotive-grade power semiconductors and advanced packaging.

BUK9277-55A belongs to Nexperia's TrenchMOS logic-level automotive power MOSFET product line, engineered specifically for robust, thermally efficient switching in 12 V and 24 V automotive electrical systems.

FAQ

Is BUK9277-55A suitable for high-frequency PWM motor control?

Yes - with 11 nC total gate charge, 47 ns rise time, and 33 ns body diode reverse recovery, it supports PWM frequencies up to 20 kHz in brushed DC motor control. However, switching losses increase above 10 kHz due to Q_GD = 5 nC and C_iss = 440–643 pF; thermal derating must be applied per Fig. 2 at elevated T_mb.

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

No fixed minimum copper area is specified, but Nexperia's thermal model assumes a 10 cm² 2-oz copper pad connected to the mounting base. With that, R_th(j-a) drops to ~35 K/W. For 18 A continuous operation, keep T_mb ≤ 100 °C per Fig. 2 - requiring forced airflow or heatsinking if ambient exceeds 70 °C.

Does BUK9277-55A require a gate resistor for automotive EMI compliance?

Yes - a 10 Ω external gate resistor is recommended (per Fig. 3 test condition) to limit dV/dt and suppress ringing caused by L_D = 2.5 nH and L_S = 7.5 nH parasitics. This reduces radiated emissions in 150 kHz–108 MHz bands and prevents false triggering in noisy automotive environments.

Can BUK9277-55A replace mechanical relays in automotive power distribution?

Yes - its 18 A continuous rating, 73 A pulsed capability, and 33 mJ avalanche energy enable solid-state relay replacement in 12 V/24 V PDUs. Unlike relays, it offers silent operation, infinite cycle life, and precise PWM control - but requires thermal management and overvoltage protection (e.g., TVS at drain) for load-dump transients.

BUK9277-55A,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):: 55 V

Current - Continuous Drain (Id) @ 25°C:: 18A (Tc)

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

Rds On (Max) @ Id, Vgs:: 69mOhm @ 10A, 10V

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

Gate Charge (Qg) (Max) @ Vgs:: 11 nC @ 5 V

Vgs (Max):: ±15V

Input Capacitance (Ciss) (Max) @ Vds:: 643 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 51W (Tc)

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

BUK9277-55A,118 FAQ

1.How can I place an order for BUK9277-55A,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK9277-55A,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 BUK9277-55A,118 reliable?

The price and inventory of BUK9277-55A,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9277-55A,118 is usually 5 days.

3.What payment methods are accepted for BUK9277-55A,118?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK9277-55A,118 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK9277-55A,118?

BUK9277-55A,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK9277-55A,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 BUK9277-55A,118?

For technical support, including BUK9277-55A,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9277-55A,118 requirements.

6.How does Aetrix verify that BUK9277-55A,118 is sourced from the original manufacturer or authorized distributors?

All BUK9277-55A,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 BUK9277-55A,118 meets industry standards.

7.What is the process for return or replacement of BUK9277-55A,118?

All BUK9277-55A,118 units undergo pre-shipment inspection (PSI). If there is an issue with BUK9277-55A,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 BUK9277-55A,118 part is unused and in its original packaging.

Return procedure for BUK9277-55A,118:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…