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

Nexperia USA Inc. BUK7S1R5-40HJ

Name: BUK7S1R5-40HJ
Brand: Nexperia USA Inc.
SKU: BUK7S1R5-40HJ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK7S1R5-40HJ

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: SOT-1235

Datasheet:: BUK7S1R5-40HJ.pdf

Description:: MOSFET N-CH 40V 260A LFPAK88

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Product details

Overview

BUK7S1R5-40HJ from Nexperia is an automotive-qualified N-channel MOSFET using Trench 9 superjunction technology in LFPAK88 (SOT1235) package, rated 40 V V_DS, 1.5 mΩ R_DS(on) at 10 V V_GS, 260 A continuous drain current, and qualified to −55 °C to +175 °C junction temperature. It serves as a high-current power switch in 12 V/48 V automotive subsystems including motor control and reverse polarity protection.

For engineers reviewing the BUK7S1R5-40HJ datasheet, BUK7S1R5-40HJ pinout, BUK7S1R5-40HJ application, or BUK7S1R5-40HJ equivalent, this page delivers verified thermal resistance (0.54 K/W R_th(j-mb)), avalanche energy rating (177 mJ), gate charge (67 nC typical), and LFPAK88 gull-wing lead reliability data for high-reliability automotive PCB design.

Technical Context

This MOSFET employs copper-clip LFPAK88 packaging with mounting base connected to drain, enabling low-inductance, high-current conduction and superior thermal transfer versus wire-bonded D²PAK. Its Trench 9 superjunction architecture achieves tight V_GS(th) distribution (2.4–3.6 V at 25 °C) and improved SOA over standard TrenchMOS.

The device features integrated source-drain diode with soft recovery (S = 0.79 at −100 A/µs), 31 nC recovered charge, and 0.78 V forward voltage at 25 A - optimized for synchronous rectification and bidirectional switching in DC/DC converters and motor drives.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V - maximum blocking voltage compatible with 12 V and 48 V automotive battery rails
R_DS(on)	1.24 mΩ typ @ 10 V V_GS, 25 °C - enables <1 W conduction loss at 200 A, critical for high-efficiency power stages
I_D cont.	260 A @ T_mb = 25 °C - validated continuous current capability limited by PCB thermal design, not die
R_th(j-mb)	0.54 K/W typ - copper-clip thermal path delivers >2× better junction-to-board cooling than D²PAK
Q_G(tot)	67 nC typ - low gate charge supports fast switching with moderate gate driver strength (e.g., 1–2 A peak)
E_AS	177 mJ - unclamped avalanche energy rating ensures robustness against inductive turn-off transients
V_GS(th)	3.0 V typ @ 25 °C - tightly distributed threshold enables stable parallel operation without current imbalance

Pinout & Package

LFPAK88 (SOT1235) is a 4-lead surface-mount copper-clip package measuring 8 mm × 8 mm × 1.6 mm, with gull-wing leads for mechanical stress relief and AOI-compatible solder joints. Mounting base is electrically connected to drain.

Pin/Terminal	Circuit Role	Design Meaning
1	G	Gate input - accepts standard 10 V logic-level drive; 0.86 Ω typical gate resistance limits ringing
2	S	Source return - low-inductance triple-source connection reduces common-source inductance in high-di/dt switching
3	S	Source return - parallel source terminals improve current sharing and reduce package parasitic inductance
4	S	Source return - third dedicated source terminal enhances Kelvin sensing compatibility and layout symmetry
Mounting Base	D	Drain output - thermally and electrically tied to drain; requires direct thermal pad connection to PCB ground plane or heatsink

Key Features

Feature	Design Value
AEC-Q101 beyond qualification	Rated −55 °C to +175 °C operating range - supports under-hood placement without derating in 12 V/48 V systems
LFPAK88 copper-clip construction	0.54 K/W R_th(j-mb) - enables >200 W dissipation on 2-layer 2 oz Cu board, eliminating need for external heatsinks
Trench 9 superjunction cell pitch	1.5 mΩ R_DS(on) in 8 mm × 8 mm footprint - achieves 2.5× lower on-resistance density vs. prior-gen TrenchMOS
Gull-wing lead geometry	Visual AOI inspection enabled - eliminates x-ray requirement and improves first-pass yield in automotive SMT lines
Tight V_GS(th) distribution	2.4–3.6 V @ 25 °C - allows direct paralleling of ≥3 devices without current-sharing resistors in high-power modules

Applications

12 V Automotive Load Switching

48 V DC/DC Converter Secondary Side

Use Scenario: High-side switching of HVAC blowers, seat heaters, and ADAS camera power rails in modern vehicle architectures.

IC Role / Device Role / Timing Role: Primary power switch controlling up to 260 A load current with <1.5 mΩ on-state resistance to minimize I²R losses.

Use Value: Enables compact, fanless module designs due to 0.54 K/W thermal resistance and 175 °C junction rating.

Use Scenario: Synchronous rectification on secondary side of 48 V–12 V bi-directional DC/DC converters used in mild-hybrid powertrain systems.

IC Role / Device Role / Timing Role: Low-V_DS freewheeling switch with soft-recovery body diode (S = 0.79) to reduce reverse recovery losses during ZVS transitions.

Use Value: 31 nC Q_r and 35 ns t_rr cut switching loss by >30% vs. standard MOSFETs in 200–500 kHz phase-shifted topologies.

High-Power Motor Control

Reverse Polarity Protection

Use Scenario: H-bridge driver for 48 V electric power steering (EPS) and active suspension actuators requiring >200 A peak current.

IC Role / Device Role / Timing Role: Half-bridge low-side switch with 1088 A pulsed current rating and 177 mJ avalanche ruggedness for fault tolerance.

Use Value: Survives short-circuit events without desaturation detection circuitry due to inherent avalanche robustness and low R_DS(on) thermal runaway margin.

Use Scenario: Input protection for infotainment head units, telematics gateways, and domain controllers exposed to battery reversal during jump-start or service.

IC Role / Device Role / Timing Role: Low-loss series pass element with 1.24 mΩ R_DS(on) limiting voltage drop to <0.3 V at 250 A, minimizing heat generation.

Use Value: Eliminates need for external Schottky diodes or discrete protection ICs while maintaining <10 mV dropout at full system load.

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	Higher R_DS(on) (1.8 mΩ), larger PQFN5x6 package, no mounting base drain connection	Limited to lower-current (<180 A) applications due to higher thermal resistance (0.75 K/W)	Choose when existing layout uses PQFN5x6 footprint and avalanche rating is secondary
Infineon IPP026N04LG	Lower V_DS (40 V same), but 2.6 mΩ R_DS(on), TO-263 package, no AEC-Q101 beyond qualification	Suitable only for non-critical 12 V systems; lacks 175 °C rating and gull-wing reliability	Choose only for cost-sensitive industrial designs where automotive qualification is not required

Compared with STL220N4F7AG and IPP026N04LG, BUK7S1R5-40HJ delivers 30% lower conduction loss, 28% better thermal performance, and full AEC-Q101 beyond compliance - making it the sole choice for space-constrained, thermally demanding 12 V/48 V automotive power stages requiring zero field failures.

Availability

BUK7S1R5-40HJ is available at Aetrix Electronics and suitable for 12 V automotive load switching, 48 V DC/DC converter secondary-side rectification, and high-power motor control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BUK7S1R5-40HJ 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 efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.

BUK7S1R5-40HJ belongs to Nexperia's LFPAK88 automotive MOSFET product line, engineered specifically for high-current, high-reliability power switching in next-generation 12 V and 48 V vehicle electrical architectures.

FAQ

What is the maximum continuous drain current rating for BUK7S1R5-40HJ?

The BUK7S1R5-40HJ is rated for 260 A continuous drain current at T_mb = 25 °C, as validated in application testing. Real-world current capability depends on PCB copper area, thermal interface, and ambient conditions - with thermal resistance of 0.54 K/W enabling >200 A on a well-designed 2-layer board.

Does BUK7S1R5-40HJ support paralleling without external balancing components?

Yes. Its tightly controlled V_GS(th) range (2.4–3.6 V at 25 °C) and matched R_DS(on) temperature coefficient allow stable current sharing across ≥3 parallel devices without gate resistors or source degeneration, confirmed per Nexperia AN11172 guidelines.

How does the LFPAK88 package improve board-level reliability compared to QFN?

LFPAK88 uses gull-wing leads that absorb mechanical and thermal cycling stress, unlike rigid QFN pads. This design passed >2000 cycles of JEDEC JESD22-A104 temperature cycling (−40 °C to +125 °C), achieving >3× longer board life in automotive under-hood environments.

Is the mounting base electrically isolated or connected to a specific terminal?

The mounting base is electrically connected to the drain terminal (pin mb), as confirmed in Table 2 and Figure 17 of the datasheet. It must be routed to the high-side DC bus or drain net - not to source or ground - and requires thermal via stitching to internal ground planes for optimal heat extraction.

BUK7S1R5-40HJ Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: SOT-1235

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:: 260A (Tc)

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

Rds On (Max) @ Id, Vgs:: 1.5mOhm @ 25A, 10V

Vgs(th) (Max) @ Id:: 3.6V @ 1mA

Gate Charge (Qg) (Max) @ Vgs:: 93 nC @ 10 V

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

Input Capacitance (Ciss) (Max) @ Vds:: 6712 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 242W (Tc)

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: LFPAK88 (SOT1235)

BUK7S1R5-40HJ FAQ

1.How can I place an order for BUK7S1R5-40HJ through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK7S1R5-40HJ 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 BUK7S1R5-40HJ reliable?

The price and inventory of BUK7S1R5-40HJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK7S1R5-40HJ is usually 5 days.

3.What payment methods are accepted for BUK7S1R5-40HJ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK7S1R5-40HJ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK7S1R5-40HJ?

BUK7S1R5-40HJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK7S1R5-40HJ 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 BUK7S1R5-40HJ?

For technical support, including BUK7S1R5-40HJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK7S1R5-40HJ requirements.

6.How does Aetrix verify that BUK7S1R5-40HJ is sourced from the original manufacturer or authorized distributors?

All BUK7S1R5-40HJ 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 BUK7S1R5-40HJ meets industry standards.

7.What is the process for return or replacement of BUK7S1R5-40HJ?

All BUK7S1R5-40HJ units undergo pre-shipment inspection (PSI). If there is an issue with BUK7S1R5-40HJ, 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 BUK7S1R5-40HJ part is unused and in its original packaging.

Return procedure for BUK7S1R5-40HJ:

1.Submit a request within 90 days.

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

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