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. BUK9Y7R6-40E,115

Name: BUK9Y7R6-40E,115
Brand: Nexperia USA Inc.
SKU: BUK9Y7R6-40E,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BUK9Y7R6-40E,115

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: SC-100, SOT-669

Datasheet:: BUK9Y7R6-40E,115.pdf

Description:: MOSFET N-CH 40V 79A LFPAK56

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,815

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

Product details

Overview

BUK9Y7R6-40E from Nexperia is an AEC-Q101-qualified N-channel logic-level MOSFET in LFPAK56 (SOT669) package, designed for automotive 12 V systems. It delivers 7.6 mΩ R_DS(on) at V_GS = 5 V and T_j = 25 °C, supports 79 A continuous drain current at T_mb = 25 °C, and operates up to 175 °C junction temperature - enabling high-reliability motor, lamp, and solenoid control in engine bays and transmission modules.

For engineers reviewing the BUK9Y7R6-40E datasheet, BUK9Y7R6-40E pinout, BUK9Y7R6-40E application, or BUK9Y7R6-40E equivalent, key selection criteria include its true logic-level gate (V_GS(th) > 0.5 V at 175 °C), repetitive avalanche rating, 1.58 K/W junction-to-mounting-base thermal resistance, and qualification for thermally demanding automotive environments.

Technical Context

This MOSFET employs TrenchMOS technology to achieve low on-resistance and fast switching with Q_GD = 5.5 nC and t_f = 16.6 ns under standard test conditions (V_DS = 30 V, R_L = 1.5 Ω, R_G(ext) = 5 Ω). Its gate threshold voltage remains functional across -55 °C to 175 °C, with V_GS(th) min of 0.5 V at maximum junction temperature.

The device integrates a robust intrinsic body diode (V_SD = 0.84–1.2 V at I_S = 20 A, T_j = 25 °C) and is rated for non-repetitive avalanche energy E_AS = 43 mJ (I_D = 79 A, V_sup ≤ 40 V, unclamped), supporting fault-tolerant power switching in safety-critical automotive subsystems.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V - Maximum drain-source blocking voltage compatible with 12 V automotive battery systems with load-dump transients.
R_DS(on)	7.6 mΩ @ V_GS = 5 V, I_D = 20 A, T_j = 25 °C - Enables low conduction loss in high-current switching nodes.
I_D (cont)	79 A @ T_mb = 25 °C - Supports high-power loads such as starter relays or HVAC blowers without external heatsinking.
T_j max	175 °C - Allows operation in under-hood locations where ambient temperatures exceed 125 °C.
R_th(j-mb)	1.58 K/W - Enables efficient heat transfer to PCB copper or heatsink via exposed mounting base (drain-connected).
Q_GD	5.5 nC - Low gate-drain charge reduces Miller-induced switching delay and improves hard-switching efficiency.
E_AS	43 mJ - Confirmed single-pulse avalanche ruggedness supports inductive load turn-off without external snubbers.

Pinout & Package

LFPAK56 (SOT669) is a surface-mount plastic package with an exposed copper mounting base electrically connected to the drain terminal. Its compact 4.9 × 3.9 mm footprint and 1.1 mm height enable high-power density layouts while maintaining low thermal resistance to PCB copper.

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 applications.
4	Gate (G)	Single gate input with low input capacitance (C_iss typ = 2055 pF) for easy 3.3 V/5 V microcontroller drive.
Mounting base	Drain (D)	Exposed copper pad serves as primary drain connection and thermal path - must be soldered to large copper area for optimal R_th(j-mb).

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD47.
True logic-level gate	V_GS(th) ≥ 0.5 V at T_j = 175 °C ensures turn-on with standard 5 V MCU GPIOs even at extreme under-hood temperatures.
Repetitive avalanche rated	Rated for repeated inductive switching events without degradation - critical for transmission solenoid drivers.
175 °C junction rating	Enables direct placement near heat sources (e.g., engine control units) without derating or forced cooling.
Low R_DS(on) × Q_G figure-of-merit	7.6 mΩ × 16.4 nC = 124.6 mΩ·nC - balances conduction and switching losses for high-efficiency 12 V DC-DC and motor drives.

Applications

Engine Control Module (ECM) Solenoid Drive

Automotive HVAC Blower Motor Control

Use Scenario: Driving fuel injector or transmission shift solenoids in engine control units exposed to under-hood temperatures up to 150 °C ambient.

IC Role / Device Role / Timing Role: High-side or low-side power switch controlling 12 V inductive loads with fast turn-off to prevent coil saturation and ensure precise timing.

Use Value: Repetitive avalanche rating eliminates need for external flyback diodes; 175 °C rating avoids thermal shutdown during sustained high-load operation.

Use Scenario: PWM-controlled blower motor in passenger cabin HVAC systems requiring variable speed and silent operation.

IC Role / Device Role / Timing Role: Low-side switching element delivering up to 79 A peak current with minimal conduction loss and low EMI due to controlled dV/dt.

Use Value: 7.6 mΩ R_DS(on) reduces power dissipation by >30% vs. legacy 12 mΩ MOSFETs, lowering thermal stress on PCB and improving system efficiency.

12 V Start-Stop System Relay Replacement

Electric Power Steering (EPS) Assist Motor Driver

Use Scenario: Solid-state replacement for mechanical relays in start-stop battery management, handling frequent 12 V cranking pulses.

IC Role / Device Role / Timing Role: Bidirectional load switch managing battery-to-starter and battery-to-accessories paths with <100 ns switching transitions.

Use Value: Q_GD = 5.5 nC and t_f = 16.6 ns minimize switching losses during rapid on/off cycles, extending service life beyond mechanical relay limits.

Use Scenario: Half-bridge leg in EPS assist motor driver operating in vibration-prone steering column environments.

IC Role / Device Role / Timing Role: High-current, high-reliability switching device with integrated body diode recovery (t_rr = 17 ns) for regenerative braking energy recirculation.

Use Value: 43 mJ E_AS withstands motor back-EMF spikes during emergency stop events; AEC-Q101 qualification ensures zero field failures over 15-year vehicle lifetime.

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), 120 A I_D, PowerFLAT 5×6 package, no AEC-Q101 certification	Higher current capability but lacks automotive qualification; requires additional reliability validation for OEM use.	Select only for non-automotive industrial motor control where qualification overhead is prohibitive.
ON Semiconductor NTMFS4C09NT1G	40 V, 7.0 mΩ R_DS(on), 82 A I_D, SO-8FL package, AEC-Q101 qualified, higher C_iss (2600 pF)	Similar performance envelope but larger package footprint and higher gate charge increases MCU drive burden.	Prefer when existing layout accommodates SO-8FL and gate drive strength exceeds 10 mA peak.

Compared with STL220N4F7AG and NTMFS4C09NT1G, BUK9Y7R6-40E uniquely balances AEC-Q101 compliance, ultra-low thermal resistance (1.58 K/W), and optimized gate charge for 5 V logic drive - making it the most suitable choice for space-constrained, thermally aggressive automotive modules requiring zero qualification risk.

Availability

BUK9Y7R6-40E is available at Aetrix Electronics and suitable for automotive engine control, HVAC actuation, and start-stop system design requiring stable component supply, long-term lifecycle support, and traceable sourcing aligned with IATF 16949 requirements.

Supply support for BUK9Y7R6-40E 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 discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.

This device belongs to Nexperia's Automotive Logic-Level MOSFET product line, engineered specifically for replacing electromechanical relays and discrete switches in 12 V automotive power distribution systems with enhanced efficiency, longevity, and thermal resilience.

FAQ

Is BUK9Y7R6-40E pin-compatible with standard SO-8 MOSFETs?

No - BUK9Y7R6-40E uses the LFPAK56 (SOT669) package, which has a different pin layout and thermal pad configuration than standard SO-8. Pin 1–3 are all source, pin 4 is gate, and the mounting base is drain. PCB layout must follow Nexperia's SOT669 footprint, not generic SO-8 land patterns.

What is the maximum recommended gate resistor for 5 V MCU drive?

A 5 Ω external gate resistor is specified in the datasheet for switching characterization (t_f, t_r). For 5 V GPIOs with ≤20 mA drive capability, a 10 Ω resistor ensures safe peak current (<500 mA) while maintaining acceptable 22.7 ns t_d(off) and 16.6 ns t_f performance.

Does the mounting base require electrical isolation from the PCB ground plane?

No - the mounting base is internally connected to the drain terminal. It must be soldered to a dedicated drain copper pour, electrically isolated from source and gate nets. Thermal vias beneath the pad should connect only to inner-layer drain planes, not to ground or signal layers.

Can BUK9Y7R6-40E replace BUZ70 in existing designs?

Only with layout and thermal redesign - BUZ70 uses TO-220 package with isolated tab, while BUK9Y7R6-40E uses surface-mount LFPAK56 with drain-connected base. Electrical specs differ: BUZ70 has 15 mΩ R_DS(on) and 100 °C T_j max, whereas BUK9Y7R6-40E offers 7.6 mΩ and 175 °C rating. Direct substitution requires validation of gate drive, thermal path, and avalanche behavior.

BUK9Y7R6-40E,115 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:: 79A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 5V, 10V

Rds On (Max) @ Id, Vgs:: 6mOhm @ 20A, 10V

Vgs(th) (Max) @ Id:: 2.1V @ 1mA

Gate Charge (Qg) (Max) @ Vgs:: 16.4 nC @ 5 V

Vgs (Max):: ±10V

Input Capacitance (Ciss) (Max) @ Vds:: 2403 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 95W (Tc)

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: LFPAK56, Power-SO8

BUK9Y7R6-40E,115 FAQ

1.How can I place an order for BUK9Y7R6-40E,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK9Y7R6-40E,115 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 BUK9Y7R6-40E,115 reliable?

The price and inventory of BUK9Y7R6-40E,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9Y7R6-40E,115 is usually 5 days.

3.What payment methods are accepted for BUK9Y7R6-40E,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK9Y7R6-40E,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK9Y7R6-40E,115?

BUK9Y7R6-40E,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK9Y7R6-40E,115 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 BUK9Y7R6-40E,115?

For technical support, including BUK9Y7R6-40E,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9Y7R6-40E,115 requirements.

6.How does Aetrix verify that BUK9Y7R6-40E,115 is sourced from the original manufacturer or authorized distributors?

All BUK9Y7R6-40E,115 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 BUK9Y7R6-40E,115 meets industry standards.

7.What is the process for return or replacement of BUK9Y7R6-40E,115?

All BUK9Y7R6-40E,115 units undergo pre-shipment inspection (PSI). If there is an issue with BUK9Y7R6-40E,115, 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 BUK9Y7R6-40E,115 part is unused and in its original packaging.

Return procedure for BUK9Y7R6-40E,115:

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…