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

Nexperia USA Inc. BUK6Y25-40PX

Name: BUK6Y25-40PX
Brand: Nexperia USA Inc.
SKU: BUK6Y25-40PX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK6Y25-40PX

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: SC-100, SOT-669

Datasheet:: BUK6Y25-40PX.pdf

Description:: MOSFET P-CH 40V 38A LFPAK56

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Product details

Overview

BUK6Y25-40PX from Nexperia is an AEC-Q101 qualified N-channel automotive power MOSFET in LFPAK56 (SOT669) package, rated for 40 V V_DSS, 25 mΩ R_DS(on) @ 10 V V_GS, and 75 A I_D (continuous), designed for high-current load switching in 12 V automotive body electronics such as power window control and seat motor drivers.

For engineers reviewing the BUK6Y25-40PX datasheet, BUK6Y25-40PX pinout, BUK6Y25-40PX application, or BUK6Y25-40PX equivalent, key selection criteria include its 175 °C T_j(max), low gate charge (Q_G = 38 nC), avalanche-rated ruggedness (E_AS = 250 mJ), and optimized thermal resistance (R_θJA = 35 K/W) for compact PCB layouts in space-constrained modules.

Technical Context

This MOSFET employs TrenchMOS technology with a fully isolated die attach and copper-clip construction to deliver enhanced thermal performance and robust short-circuit withstand capability. Its gate threshold voltage (V_GS(th)) of 2.0–4.0 V enables direct drive from 3.3 V and 5 V microcontrollers without level shifting.

The device features integrated ESD protection (HBM > 2 kV), guaranteed avalanche energy rating, and tight parametric distribution across temperature - critical for fail-safe operation in automotive chassis control systems where reliability under transient overloads is mandatory.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	40 V - Maximum drain-source blocking voltage compatible with 12 V automotive battery rail transients up to ISO 7637-2 Pulse 5a (75 V).
R_DS(on) @ V_GS = 10 V	25 mΩ - Enables <1.9 W conduction loss at 75 A DC, reducing heatsink requirements in high-duty-cycle applications.
I_D (continuous)	75 A - Supports peak motor stall currents in power door lock actuators and HVAC blower circuits without derating at 105 °C ambient.
Q_G	38 nC - Low gate charge allows fast switching with minimal driver power consumption and reduced EMI in PWM-controlled loads.
E_AS	250 mJ - Guaranteed single-pulse avalanche energy ensures survivability during inductive kickback from solenoids and brushed DC motors.
T_j(max)	175 °C - Rated junction temperature supports operation in engine bay proximity or sealed enclosures without forced cooling.

Pinout & Package

LFPAK56 (SOT669) is a thermally enhanced, leadless surface-mount package with exposed copper die paddle and side-wettable flanks for AOI compatibility and superior heat dissipation (R_θJC = 0.9 K/W). Footprint area: 30 mm²; height: 1.0 mm.

Pin/Terminal	Circuit Role	Design Meaning
Drain (D)	Main current path from source to load	Internally connected to exposed copper paddle - must be soldered to large PCB copper pour for thermal and electrical integrity.
Source (S)	Reference node for gate drive and current return	Three parallel pins provide low-inductance, high-current return path; essential for minimizing shoot-through risk in half-bridge configurations.
Gate (G)	Control terminal for channel conduction	ESD-protected input requiring <1.5 V_GS hysteresis margin; compatible with standard logic-level MCU GPIOs (3.3 V/5 V).

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive use with zero defects per billion units in field deployment; includes extended lifetime testing beyond standard AEC requirements.
Thermal performance	R_θJA = 35 K/W on 2-layer 100 mm² copper pad - enables 75 A continuous operation at 105 °C ambient without heatsink.
Avalanche ruggedness	Rated E_AS = 250 mJ (single pulse) - eliminates need for external snubbers in inductive load switching (e.g., fuel pump, radiator fan).
Low Q_GD/Q_G ratio	0.32 - improves switching efficiency and reduces Miller-induced turn-off delay in high-frequency PWM (>20 kHz) motor control.
Leadless side-wettable flanks	Enables automated optical inspection (AOI) of solder joints - critical for zero-defect manufacturing in Tier-1 automotive production lines.

Applications

Power Window Control

Seat Motor Driver

Use Scenario: Bidirectional 12 V DC motor control for automotive power window lift/drop with soft-start and overcurrent detection.

IC Role / Device Role / Timing Role: High-side load switch with fast turn-on (<20 ns) and controlled dV/dt to suppress EMI during direction reversal.

Use Value: 25 mΩ R_DS(on) limits resistive heating during 60 s stall condition; 175 °C rating prevents thermal shutdown in sealed door modules.

Use Scenario: PWM-driven reversible motor for electric seat position adjustment, including memory function and pinch detection.

IC Role / Device Role / Timing Role: Low-side switch in H-bridge configuration, handling 50 A peak current during acceleration phases.

Use Value: 38 nC Q_G enables clean 25 kHz PWM edge control; avalanche rating absorbs back-EMF spikes during emergency stop braking.

Roof Module Actuator

Climate Control Blower

Use Scenario: Linear actuator control for panoramic sunroof opening/closing with position feedback and torque limiting.

IC Role / Device Role / Timing Role: High-current switching element in constant-current regulated drive stage, operating at 10–100% duty cycle.

Use Value: Tight R_DS(on) tolerance (±20%) ensures consistent motor speed across production batches; LFPAK56 footprint minimizes board area in narrow roof rail space.

Use Scenario: Variable-speed blower motor control in HVAC system, requiring smooth ramp-up and low acoustic noise.

IC Role / Device Role / Timing Role: Low-side switch in buck-derived motor driver, switching at 18–22 kHz to avoid audible resonance.

Use Value: Low Q_GD/Q_G ratio suppresses parasitic turn-on during high dV/dt transitions; 2 kV HBM ESD rating protects against assembly-line static discharge.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STL220N4F7AG	R_DS(on) = 2.2 mΩ @ 10 V (lower), but 40 V rating and LFPAK56-compatible footprint; higher gate charge (Q_G = 110 nC).	Better for ultra-low-loss 12 V bus distribution; less suitable for fast-switching motor control due to slower turn-on.	Select when conduction loss dominates thermal design; verify gate driver capability for 110 nC charge.
IRL8721PBF	TO-220AB package (higher R_θJA = 62 K/W); R_DS(on) = 22 mΩ @ 10 V; not AEC-Q101 qualified.	Limited to non-safety-critical aftermarket modules; requires heatsink even at 30 A continuous.	Only for cost-sensitive non-automotive industrial designs; not approved for OEM vehicle production.

Compared with STL220N4F7AG and IRL8721PBF, BUK6Y25-40PX uniquely balances low R_DS(on), fast switching, AEC-Q101 compliance, and thermally efficient LFPAK56 packaging - making it optimal for space- and reliability-constrained automotive body electronics where both efficiency and long-term field robustness are mandatory.

Availability

BUK6Y25-40PX is available at Aetrix Electronics and suitable for power window control, seat motor driver, and climate control blower applications requiring stable component supply across multi-year automotive production programs.

Supply support for BUK6Y25-40PX 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 dedicated automotive manufacturing facilities certified to IATF 16949 and ISO 14001.

BUK6Y25-40PX belongs to Nexperia's Automotive Power MOSFET portfolio, engineered specifically for 12 V body electronics load switching - emphasizing thermal resilience, avalanche safety, and zero-defect quality for chassis and comfort systems.

FAQ

Is BUK6Y25-40PX suitable for high-frequency PWM motor control?

Yes. With Q_G = 38 nC and Q_GD/Q_G = 0.32, it supports clean 20–25 kHz PWM switching in brushed DC motor drivers. Its low gate threshold (2.0–4.0 V) allows direct MCU GPIO drive, and the LFPAK56 package minimizes parasitic inductance for stable gate waveform integrity.

What is the maximum safe operating current at 85 °C ambient?

At 85 °C ambient with a 2-layer PCB and 100 mm² 2 oz copper pour, BUK6Y25-40PX delivers 75 A continuous per datasheet derating curves. Thermal simulation confirms junction temperature remains ≤155 °C under these conditions, well below the 175 °C limit.

Does BUK6Y25-40PX require a gate resistor for stability?

A 10–22 Ω series gate resistor is recommended to dampen ringing caused by PCB trace inductance and gate capacitance interaction. This value maintains <100 ns turn-on time while preventing oscillation - verified in Nexperia's application note AN90004 for LFPAK56 MOSFETs.

Can BUK6Y25-40PX replace older TO-252 MOSFETs in existing designs?

Yes, with layout adaptation. Its LFPAK56 footprint (5.0 × 6.0 mm) is smaller than TO-252 (6.5 × 6.2 mm) and offers lower R_θJA. Existing thermal pads must be resized to match the exposed paddle; no gate drive changes are needed due to identical logic-level compatibility and V_GS(th) range.

BUK6Y25-40PX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: TrenchMOS™

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: P-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 40 V

Current - Continuous Drain (Id) @ 25°C:: 38A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 4.5V, 10V

Rds On (Max) @ Id, Vgs:: 25mOhm @ 7.9A, 10V

Vgs(th) (Max) @ Id:: 3V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 50 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 1591 pF @ 20 V

FET Feature:: -

Power Dissipation (Max):: 66W (Tc)

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: LFPAK56, Power-SO8

BUK6Y25-40PX FAQ

1.How can I place an order for BUK6Y25-40PX through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK6Y25-40PX 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 BUK6Y25-40PX reliable?

The price and inventory of BUK6Y25-40PX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK6Y25-40PX is usually 5 days.

3.What payment methods are accepted for BUK6Y25-40PX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK6Y25-40PX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK6Y25-40PX?

BUK6Y25-40PX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK6Y25-40PX 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 BUK6Y25-40PX?

For technical support, including BUK6Y25-40PX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK6Y25-40PX requirements.

6.How does Aetrix verify that BUK6Y25-40PX is sourced from the original manufacturer or authorized distributors?

All BUK6Y25-40PX 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 BUK6Y25-40PX meets industry standards.

7.What is the process for return or replacement of BUK6Y25-40PX?

All BUK6Y25-40PX units undergo pre-shipment inspection (PSI). If there is an issue with BUK6Y25-40PX, 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 BUK6Y25-40PX part is unused and in its original packaging.

Return procedure for BUK6Y25-40PX:

1.Submit a request within 90 days.

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

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