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

Nexperia USA Inc. BUK9Y1R6-40HX

Name: BUK9Y1R6-40HX
Brand: Nexperia USA Inc.
SKU: BUK9Y1R6-40HX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK9Y1R6-40HX

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: -

Datasheet:: BUK9Y1R6-40HX.pdf

Description:: BUK9Y1R6-40H/SOT669/LFPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BUK9Y1R6-40HX from Nexperia is an AEC-Q101 qualified N-channel logic-level MOSFET with 40 V V_DS, 1.6 mΩ R_DS(on) at V_GS = 10 V and T_j = 25 °C, housed in LFPAK56 (SOT669) package. It delivers 120 A continuous drain current at T_mb = 25 °C and supports ultra-high-performance power switching in thermally demanding automotive environments up to 175 °C junction temperature.

For engineers reviewing the BUK9Y1R6-40HX datasheet, BUK9Y1R6-40HX pinout, BUK9Y1R6-40HX application, or BUK9Y1R6-40HX equivalent, key selection criteria include its Trench 9 Superjunction architecture, tight V_GS(th) distribution (1.35–2.05 V), low R_th(j-mb) of 0.39 K/W, and robust avalanche energy rating of 158 mJ - all critical for motor, solenoid, and start-stop micro-hybrid control designs.

Technical Context

This MOSFET employs Trench 9 low-ohmic superjunction technology to achieve enhanced power density and efficiency within the LFPAK56 footprint. Its reduced cell pitch enables lower R_DS(on) while improving safe operating area (SOA) and unclamped avalanche ruggedness versus standard TrenchMOS.

The LFPAK56 package integrates copper clip construction and gull-wing leads to minimize thermal resistance (R_th(j-mb) typ. 0.39 K/W) and mechanical stress during thermal cycling. Gate threshold voltage is tightly distributed (1.35–2.05 V at T_j = 25 °C), enabling reliable paralleling without current imbalance.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V - Maximum drain-source blocking voltage compatible with 12 V automotive systems with transient margin.
R_DS(on)	1.23 mΩ typ. @ V_GS = 10 V, I_D = 25 A, T_j = 25 °C - Enables high-efficiency switching with minimal conduction loss in high-current paths.
I_D (cont)	120 A @ T_mb = 25 °C - Validated continuous current capability; limited in practice by PCB layout and thermal design.
E_AS	158 mJ - Unclamped avalanche energy rating at T_j(init) = 25 °C, supporting robust operation under inductive load turn-off stress.
R_th(j-mb)	0.39 K/W typ. - Low junction-to-mounting-base thermal resistance enables efficient heat transfer to heatsink or PCB copper.
V_GS(th)	1.62 V typ. @ I_D = 1 mA, T_j = 25 °C - Logic-level gate drive compatibility with 3.3 V/5 V controllers and tight distribution for parallel operation.
Q_G(tot)	48.9 nC max @ V_DS = 20 V, V_GS = 10 V - Total gate charge determines driver strength requirement for fast switching with controlled dV/dt.

Pinout & Package

BUK9Y1R6-40HX uses the LFPAK56 (SOT669) surface-mount package: a 4-terminal plastic single-ended package with exposed mounting base connected to drain. Dimensions: 5.8 × 4.41 × 1.01 mm (L × W × H), featuring gull-wing leads and internal copper clip for low-inductance, high-current performance.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3	Source (S)	Three parallel source terminals reduce source inductance and improve current sharing in high-frequency switching.
4	Gate (G)	Single gate input with 0.9 Ω typical gate resistance - optimized for stable drive with moderate gate resistor values.
Mounting Base (mb)	Drain (D)	Exposed copper drain pad provides primary thermal path and low-inductance high-current connection to PCB.

Key Features

Feature	Design Value
AEC-Q101 qualification	Fully qualified for automotive applications with 175 °C rated junction temperature and extended reliability testing.
Trench 9 Superjunction technology	Enables 1.23 mΩ R_DS(on) in LFPAK56 footprint - 30% lower on-resistance than prior-generation TrenchMOS at same die size.
LFPAK copper clip construction	Reduces R_DS(on) by ~15% and R_th(j-mb) by ~25% vs. wire-bonded QFN equivalents, increasing current capability and thermal headroom.
Tight V_GS(th) limits (1.35–2.05 V)	Ensures consistent turn-on behavior across temperature and unit-to-unit variation - critical for reliable MOSFET paralleling.
Gull-wing lead geometry	Enables AOI-compatible solder joint inspection and superior board-level reliability under thermal cycling vs. QFN bottom-termination packages.

Applications

Motor Control in Start-Stop Systems

Lamp and Solenoid Load Switching

Use Scenario: High-cycle switching of starter motors and idle-stop actuators in 12 V micro-hybrid vehicles.

IC Role / Device Role / Timing Role: Main power switch controlling bidirectional energy flow between battery and motor/solenoid.

Use Value: 158 mJ avalanche rating and 175 °C operation ensure survival during repeated inductive turn-off transients and under-hood thermal stress.

Use Scenario: PWM dimming and on/off control of LED headlamps and HVAC solenoids in automotive body electronics.

IC Role / Device Role / Timing Role: Low-loss, logic-level power switch driven directly by MCU GPIO or dedicated driver ICs.

Use Value: 1.23 mΩ R_DS(on) minimizes conduction loss at 10–30 A loads, while tight V_GS(th) ensures clean turn-on at 3.3 V logic levels.

Transmission Control Valve Actuation

Ultra-High-Performance Power Switching

Use Scenario: Precision current regulation for electro-hydraulic transmission control valves requiring fast, repeatable response.

IC Role / Device Role / Timing Role: High-current, low-R_DS(on) switch in closed-loop current-sense feedback paths.

Use Value: Low gate charge (48.9 nC max) and fast switching times (t_r = 30.3 ns) support kHz-range PWM control with minimal dead-time distortion.

Use Scenario: Primary switching element in high-efficiency DC-DC converters and battery disconnect circuits in ADAS and infotainment domains.

IC Role / Device Role / Timing Role: High-power synchronous rectifier or main switch in compact, thermally constrained modules.

Use Value: LFPAK56's 0.39 K/W R_th(j-mb) allows >100 A operation with minimal heatsink, reducing system volume and cost.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STL220N4F7AG	40 V, 0.95 mΩ R_DS(on) @ 10 V, but in PowerFLAT 5×6 package; higher Q_G (65 nC) and no AEC-Q101 documentation publicly available.	Higher current capability but less proven in automotive qualification; requires x-ray inspection due to bottom-termination package.	Prefer BUK9Y1R6-40HX where AEC-Q101 traceability, visual solder inspection, and thermal reliability are mandatory.
ON Semiconductor NTMFS4C09NT1G	40 V, 1.35 mΩ R_DS(on) @ 10 V in SO-8FL package; AEC-Q101 qualified but higher R_th(j-mb) (0.65 K/W) and no copper clip.	Lower R_DS(on) but inferior thermal performance - limits continuous current to ~85 A at same board conditions.	Choose BUK9Y1R6-40HX when thermal headroom, avalanche ruggedness, or high-current stability (>100 A) is required.

Compared with STL220N4F7AG and NTMFS4C09NT1G, BUK9Y1R6-40HX offers the optimal balance of AEC-Q101 assurance, LFPAK56's board-level reliability, and validated 120 A capability - making it preferred for safety-critical, high-cycle automotive power switching where long-term field reliability is non-negotiable.

Availability

BUK9Y1R6-40HX is available at Aetrix Electronics and suitable for automotive body control modules, start-stop micro-hybrid systems, and transmission control units requiring stable component supply across multi-year production cycles.

Supply support for BUK9Y1R6-40HX 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 - high-volume, high-reliability discrete, logic, and MOSFET devices for automotive, industrial, and consumer markets.

BUK9Y1R6-40HX belongs to Nexperia's LFPAK56 automotive MOSFET portfolio, engineered specifically for high-current, high-temperature 12 V automotive power switching with emphasis on AEC-Q101 compliance and board-level robustness.

FAQ

What is the maximum continuous drain current rating for BUK9Y1R6-40HX?

The datasheet specifies 120 A continuous drain current at T_mb = 25 °C, validated in application testing. In real-world designs, actual current is constrained by PCB copper area, heatsinking, ambient temperature, and duty cycle - not solely by the device's intrinsic rating. Thermal design must maintain T_j ≤ 175 °C under worst-case operating conditions.

Does BUK9Y1R6-40HX support 3.3 V logic-level gate drive?

Yes - its V_GS(th) range is 1.35–2.05 V at 25 °C, and R_DS(on) remains low (2.2 mΩ max) even at V_GS = 4.5 V. This enables full enhancement with 3.3 V or 5 V microcontroller outputs without external level-shifting, though gate drive strength must support 48.9 nC total charge for fast switching.

How does the LFPAK56 package improve reliability over standard SO-8 or QFN?

LFPAK56 replaces wire bonds with a copper clip connecting die to leads and mounting base, reducing parasitic inductance and thermal resistance. Its gull-wing leads allow optical solder-joint inspection and absorb mechanical stress during thermal cycling - unlike QFN packages that rely on hidden bottom terminations and suffer from solder fatigue failures.

Is avalanche energy rating specified for repetitive operation?

No - the 158 mJ E_AS rating is for single-pulse, unclamped avalanche only, limited by peak junction temperature of 175 °C. Repetitive avalanche is not characterized in the datasheet; designers must avoid repeated inductive turn-off events and use snubbers or freewheeling diodes to protect the device in such topologies.

BUK9Y1R6-40HX 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:: 120A (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):: 294W (Tc)

Operating Temperature:: -

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: -

Supplier Device Package:: -

BUK9Y1R6-40HX FAQ

1.How can I place an order for BUK9Y1R6-40HX through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK9Y1R6-40HX 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 BUK9Y1R6-40HX reliable?

The price and inventory of BUK9Y1R6-40HX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9Y1R6-40HX is usually 5 days.

3.What payment methods are accepted for BUK9Y1R6-40HX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK9Y1R6-40HX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK9Y1R6-40HX?

BUK9Y1R6-40HX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK9Y1R6-40HX 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 BUK9Y1R6-40HX?

For technical support, including BUK9Y1R6-40HX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9Y1R6-40HX requirements.

6.How does Aetrix verify that BUK9Y1R6-40HX is sourced from the original manufacturer or authorized distributors?

All BUK9Y1R6-40HX 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 BUK9Y1R6-40HX meets industry standards.

7.What is the process for return or replacement of BUK9Y1R6-40HX?

All BUK9Y1R6-40HX units undergo pre-shipment inspection (PSI). If there is an issue with BUK9Y1R6-40HX, 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 BUK9Y1R6-40HX part is unused and in its original packaging.

Return procedure for BUK9Y1R6-40HX:

1.Submit a request within 90 days.

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

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