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

Nexperia USA Inc. BUK7Y1R4-40HX

Name: BUK7Y1R4-40HX
Brand: Nexperia USA Inc.
SKU: BUK7Y1R4-40HX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK7Y1R4-40HX

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: -

Datasheet:: BUK7Y1R4-40HX.pdf

Description:: BUK7Y1R4-40H/SOT669/LFPAK

Quantity:: RFQ Add To RFQ list

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Inventory:385

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Product details

Overview

BUK7Y1R4-40HX from Nexperia is an automotive-qualified N-channel Trench 9 Superjunction MOSFET rated at 40 V V_DS, 1.4 mΩ R_DS(on) (max @ T_j = 25 °C), and 190 A continuous drain current (T_mb = 25 °C), housed in LFPAK56 (SOT669) package. It delivers high power density for 12 V automotive load switching, including start-stop micro-hybrid solenoid control and transmission actuation.

For engineers reviewing the BUK7Y1R4-40HX datasheet, BUK7Y1R4-40HX pinout, BUK7Y1R4-40HX application, or BUK7Y1R4-40HX equivalent, this page provides verified AEC-Q101 qualification status, thermal resistance (R_th(j-mb) = 0.29 K/W typ), avalanche energy rating (154 mJ), gate charge (Q_G(tot) = 73 nC typ), and LFPAK56 mechanical reliability data - all critical for high-reliability automotive power design.

Technical Context

This MOSFET employs Trench 9 Superjunction architecture to achieve sub-1.5 mΩ R_DS(on) in a compact LFPAK56 footprint while maintaining robust SOA and unclamped avalanche capability (E_AS = 154 mJ). Its tight V_GS(th) range (2.4–3.6 V @ T_j = 25 °C) enables stable parallel operation without current imbalance.

The LFPAK56 package integrates copper clip technology for low R_th(j-mb) (0.29 K/W typ) and reduced parasitic inductance, with gull-wing leads enabling AOI-compatible solder inspection and superior thermal cycling endurance versus QFN. Mounting base (drain-connected) serves as primary thermal path and current return.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V - Maximum drain-source blocking voltage for 12 V automotive systems with transient margin up to ISO 7637-2 Pulse 5a.
R_DS(on)	1.4 mΩ max @ V_GS = 10 V, I_D = 25 A, T_j = 25 °C - Enables <1 W conduction loss at 80 A, critical for thermally constrained engine bay layouts.
I_D (cont)	190 A @ T_mb = 25 °C - Demonstrated continuous current; actual system limit determined by PCB copper area and heatsinking.
E_AS	154 mJ - Unclamped avalanche energy rating at T_j(init) = 25 °C, supporting inductive load turn-off without external snubbers.
Q_G(tot)	73 nC typ - Total gate charge enabling fast switching with moderate gate driver strength (e.g., 1 A peak).
R_th(j-mb)	0.29 K/W typ - Junction-to-mounting-base thermal resistance supports >300 W power dissipation with 100 K ΔT to board.
V_GS(th)	2.4–3.6 V @ T_j = 25 °C - Tight threshold distribution ensures predictable turn-on behavior across temperature and unit-to-unit variation.

Pinout & Package

LFPAK56 (SOT669) is a single-ended surface-mount plastic package with copper clip construction, gull-wing leads, and exposed mounting base connected to drain. It provides enhanced board-level reliability under thermal cycling and simplified AOI inspection.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3	Source (S)	Three parallel source terminals reduce bond wire inductance and improve current sharing in high-di/dt switching.
4	Gate (G)	Single gate input with low gate resistance (0.4–2.5 Ω) for controlled turn-on/turn-off timing and EMI management.
Mounting Base (mb)	Drain (D)	Exposed copper pad electrically and thermally connected to drain; primary heat extraction path and high-current return node.

Key Features

Feature	Design Value
AEC-Q101 qualified	Fully qualified for automotive applications with 175 °C junction rating and extended lifetime testing per stress test conditions.
Trench 9 Superjunction	Enables 1.4 mΩ R_DS(on) in LFPAK56 footprint - 30% lower on-resistance than prior-generation TrenchMOS at same die size.
LFPAK copper clip	Reduces R_th(j-mb) by 40% vs. standard leadframe packages and lowers package inductance for improved dV/dt immunity.
Gull-wing leads	Enable visual AOI inspection without x-ray; eliminate voiding risk and improve solder joint mechanical integrity during thermal cycling.
Tight V_GS(th) limits	±0.6 V tolerance band (2.4–3.6 V) allows direct paralleling of ≥3 devices without gate resistor balancing.

Applications

Start-Stop Micro-Hybrid Solenoid Control

12 V Automotive Transmission Valve Actuation

Use Scenario: High-cycle solenoid driver in engine start-stop systems requiring 100,000+ actuations over vehicle lifetime.

IC Role / Device Role / Timing Role: Main power switch controlling 12 V solenoid coil with 200 ms ON time, 500 ms OFF time, and 10 A nominal current.

Use Value: 154 mJ avalanche rating absorbs inductive kickback without snubber; 175 °C rating ensures operation near hot engine blocks.

Use Scenario: PWM-controlled hydraulic valve in 8-speed automatic transmission, operating continuously at 150 °C under hood.

IC Role / Device Role / Timing Role: Low-side switch modulating 12 V supply to proportional pressure control solenoid at 1–5 kHz.

Use Value: 0.29 K/W R_th(j-mb) maintains T_j < 160 °C at 80 A RMS; tight V_GS(th) prevents thermal runaway during duty cycle drift.

Engine Bay Lamp Driver

High-Current DC Motor Starter Circuit

Use Scenario: Headlamp leveling motor driver exposed to 125 °C ambient and vibration per ISO 16750-4.

IC Role / Device Role / Timing Role: H-bridge half-bridge switch delivering bidirectional 15 A peak current to brushed DC motor.

Use Value: LFPAK56 gull-wing leads survive 2,000 thermal cycles (-40 °C to +150 °C); 190 A rating supports motor stall current.

Use Scenario: Pre-charge and main contactor bypass switch in 48 V mild-hybrid starter-generator interface.

IC Role / Device Role / Timing Role: High-side power switch handling 120 A inrush during battery connection with <100 µs response.

Use Value: 600 A pulsed IDM rating handles cold-cranking surge; copper clip minimizes voltage drop during cranking transients.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STL220N4F7AG	40 V, 0.75 mΩ R_DS(on) max, PowerFLAT 5x6 package, R_th(j-mb) = 0.45 K/W	Higher current density but higher thermal resistance; requires larger PCB copper area for same power dissipation.	Select when lowest possible R_DS(on) is prioritized over thermal performance and board-level reliability.
ON Semiconductor NTMFS4C09NT1G	40 V, 1.25 mΩ R_DS(on) max, SO-8FL package, R_th(j-mb) = 0.35 K/W, non-AEC-Q101 qualified	Lacks full AEC-Q101 qualification; suitable only for non-safety-critical 12 V accessory loads.	Select only for cost-sensitive non-automotive industrial applications where AEC-Q101 is not mandated.

Compared with STL220N4F7AG and NTMFS4C09NT1G, BUK7Y1R4-40HX offers the optimal balance of AEC-Q101 compliance, 0.29 K/W thermal resistance, and proven 154 mJ avalanche ruggedness - making it the preferred choice for safety-critical engine bay switching where long-term reliability outweighs marginal R_DS(on) reduction.

Availability

BUK7Y1R4-40HX is available at Aetrix Electronics and suitable for start-stop micro-hybrid solenoid control, 12 V automotive transmission valve actuation, and engine bay lamp driver applications requiring stable component supply across multi-year vehicle production lifecycles.

Supply support for BUK7Y1R4-40HX 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, delivering high-performance, reliable components for automotive, industrial, and consumer markets.

BUK7Y1R4-40HX belongs to Nexperia's LFPAK56 automotive MOSFET product line, engineered specifically for high-current, high-temperature 12 V automotive power switching where board-level reliability and AEC-Q101 compliance are mandatory.

FAQ

Is BUK7Y1R4-40HX qualified to AEC-Q101?

Yes, BUK7Y1R4-40HX is fully qualified to AEC-Q101 Rev D, including high-temperature operating life (HTOL), temperature cycling (TC), and unclamped inductive switching (UIS) tests. Its 175 °C maximum junction temperature rating and qualification report are documented in Nexperia's official AEC-Q101 certificate for this part number.

What is the maximum continuous drain current for BUK7Y1R4-40HX?

The maximum continuous drain current is 190 A at T_mb = 25 °C, as validated in application testing. In real-world designs, this value is limited by PCB thermal design - typical implementations achieve 120–150 A with 2 oz copper, 4-layer board, and 10 cm² thermal pad area.

Does BUK7Y1R4-40HX require a gate resistor for driving?

A gate resistor is recommended to control dV/dt and prevent oscillation. With Q_G(tot) = 73 nC and typical gate driver output impedance, a 4.7 Ω resistor achieves ~150 ns rise time and limits peak gate current to ~2.1 A when driven from 12 V, balancing switching speed and EMI.

Can BUK7Y1R4-40HX be used in parallel configurations?

Yes - its tightly controlled V_GS(th) (2.4–3.6 V) and matched R_DS(on) temperature coefficient enable stable current sharing. Parallel operation requires symmetrical layout, individual gate resistors (≤10 Ω), and shared mounting base thermal path to avoid thermal runaway.

BUK7Y1R4-40HX 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):: +20V, -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:: -

BUK7Y1R4-40HX FAQ

1.How can I place an order for BUK7Y1R4-40HX through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK7Y1R4-40HX 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 BUK7Y1R4-40HX reliable?

The price and inventory of BUK7Y1R4-40HX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK7Y1R4-40HX is usually 5 days.

3.What payment methods are accepted for BUK7Y1R4-40HX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK7Y1R4-40HX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK7Y1R4-40HX?

BUK7Y1R4-40HX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK7Y1R4-40HX 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 BUK7Y1R4-40HX?

For technical support, including BUK7Y1R4-40HX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK7Y1R4-40HX requirements.

6.How does Aetrix verify that BUK7Y1R4-40HX is sourced from the original manufacturer or authorized distributors?

All BUK7Y1R4-40HX 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 BUK7Y1R4-40HX meets industry standards.

7.What is the process for return or replacement of BUK7Y1R4-40HX?

All BUK7Y1R4-40HX units undergo pre-shipment inspection (PSI). If there is an issue with BUK7Y1R4-40HX, 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 BUK7Y1R4-40HX part is unused and in its original packaging.

Return procedure for BUK7Y1R4-40HX:

1.Submit a request within 90 days.

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

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