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Nexperia USA Inc. BUK7Y4R4-40EX
- Part No.:
- BUK7Y4R4-40EX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- FETs, MOSFETs
- Package:
- SC-100, SOT-669
- Datasheet:
-
BUK7Y4R4-40EX.pdf
- Description:
- MOSFET N-CH 40V 100A LFPAK56
- Quantity:
- Payment:
- Shipping:
Inventory:7,024
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Product details
Overview
BUK7Y4R4-40EX from Nexperia is a standard-level N-channel MOSFET designed for high-reliability automotive power switching, featuring 40 V VDS, 4.4 mΩ RDS(on) at 10 V VGS and 25 A, AEC-Q101 qualification, 175 °C maximum junction temperature, and LFPAK56 (SOT669) package with integrated mounting base. It serves as a main power switch in 12 V battery-fed systems requiring robust avalanche capability and thermal resilience.
For engineers reviewing the BUK7Y4R4-40EX datasheet, BUK7Y4R4-40EX pinout, BUK7Y4R4-40EX application, or BUK7Y4R4-40EX equivalent, key selection criteria include its true standard-level gate (VGS(th) > 1 V at 175 °C), repetitive avalanche rating, 1.02 K/W Rth(j-mb), and compatibility with thermally demanding automotive control modules where low conduction loss and high pulse current handling (521 A peak) are critical.
Technical Context
This MOSFET employs TrenchMOS technology to achieve low RDS(on) while maintaining stable threshold voltage across temperature - VGS(th) remains ≥1 V even at 175 °C. Its LFPAK56 package integrates the drain directly to the exposed mounting base, enabling efficient heat transfer and supporting continuous 100 A operation at 25 °C board temperature.
The device is characterized for ultra-fast switching with 10 ns turn-on delay, 18 ns rise time, and 13 nC QGD, while sustaining unclamped inductive switching up to 100 mJ avalanche energy. Its source-drain diode exhibits 0.84–1.2 V forward drop at 25 A and 25 ns reverse recovery time, supporting synchronous rectification and freewheeling in motor drive stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 40 V - Maximum drain-source blocking voltage compatible with 12 V automotive systems under load dump transients. |
| RDS(on) | 4.4 mΩ (typ. 3.3 mΩ) at VGS = 10 V, ID = 25 A, Tj = 25 °C - Enables <1 W conduction loss at 50 A, reducing thermal stress in compact PCB layouts. |
| ID (cont.) | 100 A at Tmb = 25 °C - Package-limited continuous current supports high-power solenoid and lamp drivers without external heatsinking. |
| EAS | 100 mJ - Non-repetitive avalanche energy rating ensures survivability during inductive load turn-off without snubber circuits. |
| Rth(j-mb) | 1.02 K/W - Low junction-to-mounting-base thermal resistance enables direct thermal coupling to copper planes or heatsinks for sustained high-current operation. |
| QGD | 13 nC - Gate-drain charge determines Miller plateau duration; enables predictable 100 kHz+ PWM control with moderate gate drive strength. |
| VGS(th) | ≥1 V at Tj = 175 °C - True standard-level gate allows direct interface with 3.3 V/5 V microcontrollers without level-shifting in hot under-hood environments. |
Pinout & Package
LFPAK56 (SOT669) is a surface-mount, single-ended power package with an exposed copper mounting base electrically connected to the drain. It provides superior thermal and electrical performance over SO-8, with 4 solderable terminals and optimized current path geometry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | Source (S) | Three parallel source terminals reduce bond-wire inductance and improve current sharing; enable low-inductance Kelvin sensing in high-side configurations. |
| 4 | Gate (G) | Single gate input with 39 nC total gate charge; designed for standard logic-level drive with minimal Miller feedback due to low Crss (253–346 pF). |
| Mounting Base (mb) | Drain (D) | Exposed copper pad forms primary drain connection and thermal path; must be soldered to large PCB copper area or heatsink for rated power dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine bay and transmission control units. |
| Repetitive avalanche rated | Rated for repeated unclamped inductive switching events per JEDEC JESD24-11, enabling robust operation in motor commutation without external protection. |
| 175 °C maximum junction temperature | Enables operation in high-ambient environments (e.g., near exhaust manifolds or power inverters) without derating beyond datasheet thermal curves. |
| True standard-level gate | VGS(th) ≥1 V at 175 °C ensures reliable turn-on with 3.3 V or 5 V MCU GPIOs, eliminating need for gate driver ICs in space-constrained modules. |
| Low RDS(on) × QG figure of merit | ~170 mΩ·nC - balances conduction and switching losses for high-efficiency 10–200 kHz DC-DC and motor phase control applications. |
Applications
| Engine Control Unit (ECU) Fuel Injector Driver | Automatic Transmission Solenoid Valve Control |
|---|---|
|
Use Scenario: High-speed, high-current switching of 12 V fuel injectors in gasoline direct injection systems with tight PWM timing and thermal constraints. IC Role / Device Role / Timing Role: Main power switch controlling injector coil current; operates in saturated on-state with <100 ns dead-time tolerance between phases. Use Value: 4.4 mΩ RDS(on) minimizes resistive heating during 10–20 ms dwell periods, while 175 °C rating ensures stability during prolonged idle-stop cycles. |
Use Scenario: Precise proportional current control of hydraulic solenoids in 8-speed automatic transmissions, requiring fast response and long-term reliability. IC Role / Device Role / Timing Role: Low-side switch regulating solenoid current via PWM; handles 5–10 A continuous and 50 A peak during gear shifts. Use Value: Repetitive avalanche rating absorbs back-EMF spikes during rapid current interruption, eliminating need for discrete flyback diodes and saving board space. |
| Body Control Module (BCM) Headlamp Switching | Electric Power Steering (EPS) Motor Phase Leg |
|
Use Scenario: On/off control of LED and halogen headlamps in modern BCMs, subject to load dump (ISO 7637-2 Pulse 5a) and thermal cycling. IC Role / Device Role / Timing Role: High-side or low-side power switch interfacing with CAN/LIN-controlled PWM dimming logic. Use Value: 40 V VDS withstands 35 V transients; AEC-Q101 qualification guarantees >15-year field life in harsh under-hood conditions. |
Use Scenario: Half-bridge phase leg in 12 V EPS motor drives, operating continuously at elevated ambient temperatures with frequent torque transients. IC Role / Device Role / Timing Role: Low-side switch in three-phase inverter; conducts 30–60 A RMS with 100 A peak during assist events. Use Value: 1.02 K/W Rth(j-mb) enables direct thermal coupling to aluminum chassis, maintaining Tj < 150 °C without forced air cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-channel automotive power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STL220N4F7AG | 40 V, 2.2 mΩ RDS(on), 200 A peak, PowerFLAT 5x6 package, no AEC-Q101 certification | Higher current capability but lacks automotive qualification; requires additional reliability validation for safety-critical use | Select only for non-safety automotive or industrial applications where cost-per-amp is prioritized over qualification overhead. |
| IRL8721PBF | 30 V, 4.5 mΩ RDS(on), TO-220AB package, 175 °C rated, not AEC-Q101 qualified | Lower voltage rating limits use to 5–12 V systems without transient margin; through-hole mounting increases assembly cost and reduces thermal performance | Consider only for legacy designs or prototyping where footprint flexibility outweighs thermal and qualification requirements. |
Compared with STL220N4F7AG and IRL8721PBF, BUK7Y4R4-40EX uniquely combines AEC-Q101 qualification, 40 V rating with margin for ISO 7637-2 transients, and LFPAK56's low Rth(j-mb) - making it the only option qualified for production deployment in safety-relevant 12 V automotive power stages without design revalidation.
Availability
BUK7Y4R4-40EX is available at Aetrix Electronics and suitable for automotive body control modules, transmission control units, and electric power steering systems requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for BUK7Y4R4-40EX 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 - high-volume, high-reliability devices for automotive, industrial, and consumer applications.
BUK7Y4R4-40EX belongs to Nexperia's LFPAK automotive MOSFET product line, engineered specifically for high-current, high-temperature automotive power switching where AEC-Q101 compliance, avalanche ruggedness, and thermal efficiency are mandatory.
FAQ
Is BUK7Y4R4-40EX pin-compatible with other LFPAK56 MOSFETs?
Yes - BUK7Y4R4-40EX uses the standard SOT669 footprint with pins 1–3 as source, pin 4 as gate, and the mounting base as drain. All Nexperia LFPAK56 MOSFETs share identical land pattern and thermal pad layout, enabling drop-in replacement within the same voltage/current class when RDS(on) and QG tolerances permit.
What is the maximum recommended gate resistor for PWM switching at 50 kHz?
A 5 Ω external gate resistor is specified in the datasheet for test conditions (VGS = 10 V, RG(ext) = 5 Ω). For 50 kHz operation, this value balances switching speed (18 ns rise time) and gate drive stability; lowering below 3 Ω may cause ringing, while exceeding 10 Ω increases switching losses by >25% based on QG = 39 nC.
Does BUK7Y4R4-40EX require a gate pull-down resistor in automotive applications?
Yes - a 10 kΩ gate-to-source pull-down resistor is recommended to ensure defined off-state during MCU reset, cold cranking (battery dip), or LIN/CAN bus sleep modes. This prevents unintended turn-on due to noise coupling into the high-impedance gate node, especially critical in safety-related solenoid and injector circuits.
Can BUK7Y4R4-40EX be used in synchronous rectification topologies?
Yes - its integrated source-drain diode has 25 ns reverse recovery time and 18 nC recovered charge (Qr), enabling use in secondary-side synchronous rectification for 12 V DC-DC converters. However, its VSD = 0.84–1.2 V at 25 A is higher than Schottky alternatives, so efficiency gain is most pronounced above 20 A load current.
BUK7Y4R4-40EX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- TrenchMOS™
- 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:
- 100A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 10V
- Rds On (Max) @ Id, Vgs:
- 4.4mOhm @ 25A, 10V
- Vgs(th) (Max) @ Id:
- 4V @ 1mA
- Gate Charge (Qg) (Max) @ Vgs:
- 39 nC @ 10 V
- Vgs (Max):
- ±20V
- Input Capacitance (Ciss) (Max) @ Vds:
- 2781 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 147W (Tc)
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- LFPAK56, Power-SO8
BUK7Y4R4-40EX FAQ
1.How can I place an order for BUK7Y4R4-40EX through Aetrix?
Please submit a Request for Quotation (RFQ) for BUK7Y4R4-40EX 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 BUK7Y4R4-40EX reliable?
The price and inventory of BUK7Y4R4-40EX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK7Y4R4-40EX is usually 5 days.
3.What payment methods are accepted for BUK7Y4R4-40EX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK7Y4R4-40EX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUK7Y4R4-40EX?
BUK7Y4R4-40EX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUK7Y4R4-40EX 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 BUK7Y4R4-40EX?
For technical support, including BUK7Y4R4-40EX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK7Y4R4-40EX requirements.
6.How does Aetrix verify that BUK7Y4R4-40EX is sourced from the original manufacturer or authorized distributors?
All BUK7Y4R4-40EX 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 BUK7Y4R4-40EX meets industry standards.
7.What is the process for return or replacement of BUK7Y4R4-40EX?
All BUK7Y4R4-40EX units undergo pre-shipment inspection (PSI). If there is an issue with BUK7Y4R4-40EX, 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 BUK7Y4R4-40EX part is unused and in its original packaging.
Return procedure for BUK7Y4R4-40EX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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