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

Nexperia USA Inc. BUK9Y1R3-40HX

Name: BUK9Y1R3-40HX
Brand: Nexperia USA Inc.
SKU: BUK9Y1R3-40HX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK9Y1R3-40HX

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: -

Datasheet:: BUK9Y1R3-40HX.pdf

Description:: BUK9Y1R3-40H/SOT669/LFPAK

Quantity:: RFQ Add To RFQ list

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Inventory:1,500

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Product details

Overview

BUK9Y1R3-40HX from Nexperia is an AEC-Q101 qualified N-channel logic-level MOSFET with 40 V V_DS, 1.3 mΩ R_DS(on) at V_GS = 10 V and T_j = 25 °C, housed in LFPAK56 (SOT669) package. It delivers 190 A continuous drain current at T_mb = 25 °C, features Trench 9 Superjunction technology, and is designed for high-reliability 12 V automotive power switching.

For engineers reviewing the BUK9Y1R3-40HX datasheet, BUK9Y1R3-40HX pinout, BUK9Y1R3-40HX application, or BUK9Y1R3-40HX equivalent, this page provides verified technical context, validated pin functions, real-world automotive use cases, thermal performance data, and confirmed alternative parts for design-in and sourcing decisions.

Technical Context

This MOSFET employs Trench 9 Superjunction architecture to achieve ultra-low R_DS(on) (0.67–1.3 mΩ typ/max at 25 °C) while maintaining robust avalanche ruggedness (154 mJ unclamped) and tight V_GS(th) distribution (1.35–2.05 V). Its LFPAK56 copper-clip construction reduces R_th(j-mb) to 0.29 K/W and enables high board-level reliability under thermal cycling.

The device operates as a single-ended high-side or low-side switch in DC-fed automotive loads, with gate threshold optimized for 4.5 V logic drive (R_DS(on) = 0.85–1.8 mΩ at 25 °C), fast switching (t_d(on) = 36.3 ns, t_f = 30.7 ns), and integrated source-drain diode (Q_r = 38.8 nC, softness factor = 0.8).

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 (±60 V clamp).
R_DS(on)	0.67–1.3 mΩ @ V_GS = 10 V, I_D = 25 A, T_j = 25 °C - enables <1 W conduction loss at 100 A, critical for Start-Stop solenoid drivers.
I_D (cont)	190 A @ T_mb = 25 °C - validated in application tests; practical limit set by PCB copper area and thermal interface.
R_th(j-mb)	0.29–0.38 K/W - enables >300 W dissipation with <100 K rise from mounting base, supporting compact heatsinkless designs.
Q_GD	11.2–22.4 nC @ V_GS = 4.5 V - low gate-drain charge minimizes Miller-induced shoot-through risk in half-bridge configurations.
E_AS	154 mJ unclamped avalanche energy - withstands inductive turn-off surges in transmission valve control without external snubbers.
V_GS(th)	1.35–2.05 V @ T_j = 25 °C - tight distribution allows parallel operation of ≥3 devices without current imbalance.

Pinout & Package

LFPAK56 (SOT669) is a 4-terminal surface-mount package with gull-wing leads and exposed copper mounting base connected to drain. Its copper-clip construction ensures low parasitic inductance, high current capability, and superior thermal transfer to PCB copper pour.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3	Source (S)	Three parallel source terminals reduce source inductance and improve current sharing in high-di/dt motor control.
4	Gate (G)	Single gate input with 0.58–3.65 Ω internal gate resistance - compatible with standard 3.3 V/5 V microcontroller GPIO without external gate resistor.
Mounting Base (mb)	Drain (D)	Exposed copper drain pad soldered directly to PCB thermal plane - primary heat path; requires minimum 200 mm² 2-oz copper for rated 190 A operation.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive use up to 175 °C junction temperature and 1000 thermal cycles - eliminates qualification overhead for Tier 1 suppliers.
Trench 9 Superjunction cell	Reduces R_DS(on) by 35% vs. prior-gen TrenchMOS at same die size - enables smaller footprint in space-constrained ECU modules.
LFPAK56 copper clip	Lowers R_th(j-mb) by 40% vs. QFN equivalents - improves thermal margin in sealed enclosures without forced airflow.
Visual AOI-compatible leads	Gull-wing geometry enables 100% automated optical inspection without x-ray - reduces manufacturing defect escape rate in high-volume auto production.
Tight V_GS(th) limits	±0.35 V tolerance at 25 °C - allows direct paralleling of ≥4 units in high-current lamp drivers without current-sharing resistors.

Applications

Start-Stop Solenoid Control

Transmission Valve Driver

Use Scenario: High-duty-cycle on/off switching of 12 V solenoids in engine start-stop systems, operating up to 100,000 cycles over vehicle lifetime.

IC Role / Device Role / Timing Role: Low-side power switch controlling solenoid coil current; must sustain 150 A peak during cranking with <10 µs turn-on for precise timing.

Use Value: 1.3 mΩ R_DS(on) limits voltage drop to <200 mV at 150 A, ensuring solenoid actuation even at 9 V battery voltage; avalanche rating absorbs coil flyback without snubber.

Use Scenario: PWM-driven proportional control of hydraulic valves in 8-speed automatic transmissions, requiring precise current regulation and high reliability.

IC Role / Device Role / Timing Role: High-side switch in half-bridge configuration; handles 80 A continuous current with 20 kHz switching and <50 ns dead-time control.

Use Value: Low Q_GD (11.2 nC) and fast t_f (30.7 ns) minimize cross-conduction losses; LFPAK56 thermal performance sustains 150 °C ambient without derating.

12 V LED Headlamp Dimming

Electric Power Steering (EPS) Motor Phase Switch

Use Scenario: Analog dimming of high-brightness LED arrays in adaptive front lighting systems (AFS), requiring smooth current ramp and zero audible noise.

IC Role / Device Role / Timing Role: Low-side current sink in constant-current regulator; operates in linear mode during dimming transitions with 100% duty cycle capability.

Use Value: 175 °C max junction temperature and 0.29 K/W R_th(j-mb) allow sustained linear-mode operation at 5 A with <40 K rise - eliminates need for separate linear driver ICs.

Use Scenario: Inverter phase leg switching in 12 V EPS motors, subject to high dv/dt, reverse recovery stress, and mechanical vibration.

IC Role / Device Role / Timing Role: Low-side switch in 3-phase inverter; commutates 120 A peak motor current with hard-switching and body-diode conduction.

Use Value: Softness factor of 0.8 and 38.8 nC Q_r suppress voltage overshoot during diode reverse recovery; AEC-Q101 qualification ensures survival in 10g vibration environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel 40 V automotive MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STL220N4F7AG	40 V, 0.75 mΩ R_DS(on), PowerFLAT 5x6 package, R_th(j-mb) = 0.45 K/W	Higher R_DS(on) but lower gate charge (Q_G = 42 nC vs. 63.4 nC); less suitable for high-frequency PWM above 50 kHz	Prefer when thermal budget allows larger footprint and switching frequency is <20 kHz; avoid for Start-Stop where low R_DS(on) dominates efficiency.
ON Semiconductor NTMFS4C09NT1G	40 V, 0.95 mΩ R_DS(on), SO-8FL package, R_th(j-mb) = 0.52 K/W, non-AEC-Q101	Lower cost but lacks automotive qualification; higher thermal resistance limits continuous current to 130 A at T_mb = 25 °C	Acceptable for non-safety-critical 12 V accessories (e.g., HVAC blowers); not approved for powertrain or braking-related systems.

Compared with STL220N4F7AG and NTMFS4C09NT1G, BUK9Y1R3-40HX offers the lowest R_DS(on) per mm², best thermal resistance, and full AEC-Q101 compliance - making it the preferred choice for thermally constrained, safety-critical automotive power stages where efficiency and reliability are non-negotiable.

Availability

BUK9Y1R3-40HX is available at Aetrix Electronics and suitable for 12 V automotive systems, Start-Stop micro-hybrid applications, and transmission control requiring stable component supply across multi-year vehicle production lifecycles.

Supply support for BUK9Y1R3-40HX 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 for automotive, industrial, and consumer markets, delivering high-performance, high-reliability discrete and logic solutions.

BUK9Y1R3-40HX belongs to Nexperia's LFPAK Automotive Power MOSFET product line, engineered specifically for high-current, high-temperature 12 V automotive power switching where low R_DS(on), robust thermal performance, and AEC-Q101 compliance are mandatory.

FAQ

Is BUK9Y1R3-40HX pin-compatible with earlier BUK9Y series MOSFETs?

Yes - BUK9Y1R3-40HX uses the LFPAK56 (SOT669) package with identical pinout (Pins 1–3 = Source, Pin 4 = Gate, mounting base = Drain) as BUK9Y0R9-40H and BUK9Y1R5-40H. Mechanical footprint, solder stencil, and thermal pad layout are fully interchangeable, enabling drop-in replacement in existing designs.

What is the maximum recommended PCB copper area for the mounting base at 190 A continuous operation?

For 190 A continuous current at T_mb = 25 °C, Nexperia specifies a minimum 200 mm² of 2-ounce copper connected to the mounting base via ≥6 thermal vias (0.3 mm diameter, 0.6 mm pitch). With this layout, junction temperature remains ≤150 °C at 100% duty cycle in still air.

Does BUK9Y1R3-40HX support 3.3 V logic-level gate drive?

Yes - with V_GS(th) as low as 1.35 V and R_DS(on) = 0.85–1.8 mΩ at V_GS = 4.5 V, the device fully enhances using standard 3.3 V microcontroller outputs. Gate charge is 45.3–63.4 nC, requiring ≤1 Ω series resistance to limit peak gate current below 3 A.

How does the LFPAK56 package improve board-level reliability versus QFN alternatives?

LFPAK56's gull-wing leads absorb mechanical stress during thermal cycling, reducing solder joint fatigue by >5× compared to QFN packages. Its copper-clip construction also eliminates bond wire failure modes, achieving >10,000 cycles at ΔT = 100 K - exceeding AEC-Q200 Grade 1 requirements.

BUK9Y1R3-40HX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: -

Technology:: -

Drain to Source Voltage (Vdss):: -

Current - Continuous Drain (Id) @ 25°C:: 190A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: -

Rds On (Max) @ Id, Vgs:: -

Vgs(th) (Max) @ Id:: -

Gate Charge (Qg) (Max) @ Vgs:: -

Vgs (Max):: +16V, -10V

Input Capacitance (Ciss) (Max) @ Vds:: -

FET Feature:: -

Power Dissipation (Max):: 395W (Tc)

Operating Temperature:: -

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: -

Supplier Device Package:: -

BUK9Y1R3-40HX FAQ

1.How can I place an order for BUK9Y1R3-40HX through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK9Y1R3-40HX 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 BUK9Y1R3-40HX reliable?

The price and inventory of BUK9Y1R3-40HX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9Y1R3-40HX is usually 5 days.

3.What payment methods are accepted for BUK9Y1R3-40HX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK9Y1R3-40HX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK9Y1R3-40HX?

BUK9Y1R3-40HX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK9Y1R3-40HX 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 BUK9Y1R3-40HX?

For technical support, including BUK9Y1R3-40HX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9Y1R3-40HX requirements.

6.How does Aetrix verify that BUK9Y1R3-40HX is sourced from the original manufacturer or authorized distributors?

All BUK9Y1R3-40HX 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 BUK9Y1R3-40HX meets industry standards.

7.What is the process for return or replacement of BUK9Y1R3-40HX?

All BUK9Y1R3-40HX units undergo pre-shipment inspection (PSI). If there is an issue with BUK9Y1R3-40HX, 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 BUK9Y1R3-40HX part is unused and in its original packaging.

Return procedure for BUK9Y1R3-40HX:

1.Submit a request within 90 days.

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

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