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

Nexperia USA Inc. BUK7Y3R5-40HX

Name: BUK7Y3R5-40HX
Brand: Nexperia USA Inc.
SKU: BUK7Y3R5-40HX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK7Y3R5-40HX

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: SC-100, SOT-669

Datasheet:: BUK7Y3R5-40HX.pdf

Description:: MOSFET N-CH 40V 120A LFPAK56

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Product details

Overview

BUK7Y3R5-40HX from Nexperia is an automotive-qualified N-channel MOSFET using Trench 9 superjunction technology in LFPAK56 (SOT669) package, rated for 40 V V_DS, 3.5 mΩ R_DS(on) at 10 V V_GS, 120 A continuous drain current at T_mb = 25 °C, and 175 °C junction temperature - deployed in 12 V start-stop micro-hybrid transmission control.

For engineers reviewing the BUK7Y3R5-40HX datasheet, BUK7Y3R5-40HX pinout, BUK7Y3R5-40HX application, or BUK7Y3R5-40HX equivalent, key selection criteria include AEC-Q101 qualification, LFPAK56 thermal performance (R_th(j-mb) = 1.18 K/W), tight V_GS(th) limits (2.4–3.6 V), avalanche ruggedness (45 mJ), and gate charge profile (Q_G(tot) = 31–53 nC).

Technical Context

This MOSFET employs Trench 9 superjunction architecture to achieve reduced cell pitch, enabling lower R_DS(on) (2.9 mΩ typ at 25 °C) and improved safe operating area versus prior TrenchMOS generations. Its 175 °C rating supports operation in thermally constrained engine-bay environments without derating penalties typical of standard-level devices.

The LFPAK56 package integrates copper clip interconnects and gull-wing leads to minimize parasitic inductance and thermal resistance while enabling AOI-compatible solder inspection. Mounting base (drain-connected) provides direct thermal path to PCB copper, with normalized power derating down to 0% at T_mb = 200 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V maximum - supports full 12 V automotive battery transient margin (ISO 7637-2 Pulse 5a up to 40 V) without breakdown.
R_DS(on)	3.5 mΩ max at V_GS = 10 V, I_D = 25 A, T_j = 25 °C - enables <1.5 W conduction loss at 60 A, critical for high-efficiency solenoid drivers.
I_D (cont)	120 A at T_mb = 25 °C - validated in application tests; real-world limit set by PCB copper area and thermal interface design.
E_AS	45 mJ non-repetitive avalanche energy - withstands inductive kickback from 12 V lamp/motor loads without snubber circuitry.
Q_G(tot)	53 nC max - determines gate driver power requirement; compatible with standard 1 A peak gate drivers for <1 µs switching transitions.
R_th(j-mb)	1.3 K/W max - enables >90 W dissipation with 120 °C ΔT between junction and mounting base, supporting compact heatsinkless designs.
V_GS(th)	2.4–3.6 V at T_j = 25 °C - tight distribution allows stable parallel operation without current imbalance.

Pinout & Package

LFPAK56 (SOT669) is a 4-terminal surface-mount package with exposed copper mounting base (drain-connected), optimized for low-inductance, high-current automotive applications. It features gull-wing leads for mechanical stress absorption and AOI-friendly solder joint inspection.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3	Source (S)	Three parallel source terminals reduce bond wire inductance and improve current sharing; connected internally to source metallization.
4	Gate (G)	Single gate input with 0.32–2 Ω intrinsic gate resistance - sets minimum gate drive strength requirement and dV/dt immunity.
Mounting Base	Drain (D)	Exposed copper pad electrically and thermally connected to drain; requires PCB copper pour for thermal management and current return path.

Key Features

Feature	Design Value
AEC-Q101 qualified	Fully tested to automotive reliability standards including HTGB, HTRB, TC, and UHAST - ensures >15-year field life in under-hood environments.
Trench 9 superjunction	Enables 3.5 mΩ R_DS(on) in LFPAK56 footprint - delivers 2× power density vs. legacy TrenchMOS, reducing board space in multi-MOSFET modules.
LFPAK copper clip	Reduces R_DS(on) by 15% and R_th(j-mb) by 20% vs. wire-bonded equivalents - improves current capability and thermal response during pulsed load events.
Soft reverse recovery diode	S-factor = 0.8 typ - suppresses voltage overshoot during inductive turn-off, eliminating need for external freewheeling diodes in lamp/solenoid drivers.
Gull-wing leads	Enables visual AOI inspection without X-ray - reduces manufacturing cost and increases first-pass yield in high-volume automotive PCB assembly.

Applications

Transmission Control Valve Driver

Start-Stop Micro-Hybrid Starter Relay

Use Scenario: High-current PWM control of hydraulic solenoids in dual-clutch automatic transmissions, operating continuously at 12 V with 80 A peak loads.

IC Role / Device Role / Timing Role: Main power switch replacing electromechanical relays; handles 10 kHz switching with <10 ns propagation delay and 9 ns fall time.

Use Value: Eliminates relay chatter and contact wear; achieves 99.2% efficiency at 60 A due to 2.9 mΩ R_DS(on), reducing thermal load on transmission control unit PCB.

Use Scenario: Solid-state replacement for starter motor engagement relay in 12 V micro-hybrid systems, cycling up to 50,000 times over vehicle lifetime.

IC Role / Device Role / Timing Role: High-side load switch controlling starter solenoid coil; sustains 120 A inrush current for 50 ms with <1.18 K/W thermal resistance.

Use Value: Enables precise timing of crank engagement via MCU-controlled gate drive; survives 45 mJ unclamped avalanche events during coil de-energization.

Automotive Lamp Load Switch

Electric Power Steering Motor Phase Switch

Use Scenario: Overcurrent-protected headlamp and foglamp switching in ADAS-integrated lighting modules, subject to ISO 16750-2 load dump transients.

IC Role / Device Role / Timing Role: Low-side switching element with integrated body diode; handles 25 A steady-state and 526 A pulsed drain current.

Use Value: Withstands 40 V transients without clamping; soft-recovery diode (Q_r = 16 nC, S = 0.8) prevents EMI during lamp turn-off, meeting CISPR 25 Class 5.

Use Scenario: Half-bridge phase leg in 12 V EPS motor controllers, switching at 20 kHz with 100% duty cycle capability during assist events.

IC Role / Device Role / Timing Role: High-current, low-R_DS(on) N-channel switch in three-phase inverter; operates up to 175 °C junction temperature.

Use Value: Copper clip construction maintains R_DS(on) stability across -40 to 175 °C; tight V_GS(th) tolerance enables accurate current sensing via shunt resistor in high-side configuration.

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, 2.2 mΩ R_DS(on), PowerFLAT 5x6 package, R_th(j-mb) = 1.5 K/W, Q_G(tot) = 65 nC	Higher gate charge increases driver losses; larger footprint limits layout density in space-constrained EPS modules.	Prefer when lower R_DS(on) outweighs thermal resistance penalty and board area is available.
ONsemi NTMFS5C673NL	40 V, 3.7 mΩ R_DS(on), SO-8FL package, R_th(j-mb) = 1.4 K/W, Q_G(tot) = 48 nC	SO-8FL lacks mounting base thermal path; relies on PCB copper for heat removal, limiting sustained current to ~90 A.	Choose only for non-automotive industrial use where AEC-Q101 is not required and thermal budget permits.

Compared with STL220N4F7AG and NTMFS5C673NL, BUK7Y3R5-40HX delivers superior thermal performance (1.18 K/W), tighter V_GS(th) distribution for paralleling, and proven AEC-Q101 compliance - making it optimal for high-reliability, high-power-density automotive power stages where junction temperature control and avalanche robustness are critical.

Availability

BUK7Y3R5-40HX is available at Aetrix Electronics and suitable for automotive transmission control, start-stop micro-hybrid systems, and 12 V lamp load switching requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BUK7Y3R5-40HX 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 high-volume, high-reliability discrete and logic devices, with leadership in automotive MOSFETs, ESD protection, and logic ICs.

BUK7Y3R5-40HX belongs to Nexperia's LFPAK56 automotive power MOSFET family, engineered specifically for thermally demanding 12 V vehicle systems requiring AEC-Q101 compliance, high current density, and robust avalanche performance.

FAQ

Is BUK7Y3R5-40HX pin-compatible with other LFPAK56 MOSFETs?

Yes - BUK7Y3R5-40HX uses the standard SOT669 (LFPAK56) 4-pin outline with pins 1–3 as source, pin 4 as gate, and mounting base as drain. This matches all Nexperia LFPAK56 N-channel MOSFETs, enabling drop-in replacement within the same voltage/current class when thermal and gate drive requirements align.

What is the maximum recommended gate drive voltage?

The absolute maximum V_GS is ±20 V per datasheet limiting values. For reliable operation, drive voltage should be limited to 10 V to 15 V - 10 V ensures full enhancement and minimal R_DS(on), while 15 V remains within safe margin and avoids accelerated gate oxide degradation observed above 16 V in prolonged operation.

Does BUK7Y3R5-40HX require a gate resistor for automotive EMI compliance?

Yes - a 5 Ω external gate resistor is specified in the datasheet for switching characterization (Fig. 3, Fig. 13). This value balances switching speed (tr = 8 ns, tf = 9 ns) and dV/dt control to meet CISPR 25 Class 5 radiated emissions limits in 12 V systems without adding ferrite beads or RC snubbers.

Can BUK7Y3R5-40HX be used in synchronous rectification?

No - BUK7Y3R5-40HX is a standard-level (not logic-level) MOSFET with V_GS(th) min of 2.4 V. Its gate threshold requires ≥10 V for low R_DS(on); it lacks the low-threshold design needed for self-driven synchronous rectification in 3.3 V or 5 V output rails.

BUK7Y3R5-40HX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: SC-100, SOT-669

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 40 V

Current - Continuous Drain (Id) @ 25°C:: 120A (Tc)

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

Rds On (Max) @ Id, Vgs:: 3.5mOhm @ 25A, 10V

Vgs(th) (Max) @ Id:: 4V @ 1mA

Gate Charge (Qg) (Max) @ Vgs:: 53 nC @ 10 V

Vgs (Max):: +20V, -10V

Input Capacitance (Ciss) (Max) @ Vds:: 3441 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 115W (Tc)

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: LFPAK56, Power-SO8

BUK7Y3R5-40HX FAQ

1.How can I place an order for BUK7Y3R5-40HX through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK7Y3R5-40HX 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 BUK7Y3R5-40HX reliable?

The price and inventory of BUK7Y3R5-40HX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK7Y3R5-40HX is usually 5 days.

3.What payment methods are accepted for BUK7Y3R5-40HX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK7Y3R5-40HX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK7Y3R5-40HX?

BUK7Y3R5-40HX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK7Y3R5-40HX 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 BUK7Y3R5-40HX?

For technical support, including BUK7Y3R5-40HX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK7Y3R5-40HX requirements.

6.How does Aetrix verify that BUK7Y3R5-40HX is sourced from the original manufacturer or authorized distributors?

All BUK7Y3R5-40HX 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 BUK7Y3R5-40HX meets industry standards.

7.What is the process for return or replacement of BUK7Y3R5-40HX?

All BUK7Y3R5-40HX units undergo pre-shipment inspection (PSI). If there is an issue with BUK7Y3R5-40HX, 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 BUK7Y3R5-40HX part is unused and in its original packaging.

Return procedure for BUK7Y3R5-40HX:

1.Submit a request within 90 days.

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

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