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Nexperia USA Inc. BUK7K25-40E,115
- Part No.:
- BUK7K25-40E,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- FET, MOSFET Arrays
- Package:
- SOT-1205, 8-LFPAK56
- Datasheet:
-
BUK7K25-40E,115.pdf
- Description:
- MOSFET 2N-CH 40V 27A LFPAK56D
- Quantity:
- Payment:
- Shipping:
Inventory:2,824
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Product details
Overview
BUK7K25-40E from Nexperia is a dual N-channel TrenchMOS standard-level power MOSFET in LFPAK56D (SOT1205) package, rated for 40 V VDS, 27 A continuous drain current at 25 °C mounting base temperature, and 175 °C junction operation. It delivers 21.25 mΩ typical RDS(on) at VGS = 10 V and ID = 5 A, with QGD = 2.6 nC and Rth(j-mb) = 4.68 K/W - engineered for high-reliability 12 V automotive load switching including solenoids, motors, and transmission control.
For engineers reviewing the BUK7K25-40E datasheet, BUK7K25-40E pinout, BUK7K25-40E application, or BUK7K25-40E equivalent, this AEC-Q101-qualified dual FET supports thermally demanding automotive environments, offers true standard-level gate drive (VGS(th) > 1 V at 175 °C), and provides repetitive avalanche capability - critical for start-stop micro-hybrid systems and ultra-high-performance power switching where thermal stability and ruggedness are non-negotiable.
Technical Context
This device integrates two independent N-channel MOSFETs in a single LFPAK56D package, sharing no internal connection between channels - enabling fully isolated dual-switching paths. Its TrenchMOS architecture delivers low RDS(on) with tight parametric distribution across temperature, while the 175 °C Tj rating and 4.68 K/W junction-to-mounting-base thermal resistance support direct PCB copper pad thermal coupling without heatsinks in constrained layouts.
The gate threshold voltage remains functional above 1 V even at maximum junction temperature, ensuring reliable turn-on with standard 5 V or 12 V logic drivers. Repetitive avalanche energy rating of 10 mJ (single-pulse, ID = 28 A) and 107 A peak drain current (10 µs pulse) provide robustness against inductive kickback in motor and solenoid control circuits without external snubbers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 40 V - Maximum drain-source blocking voltage; suitable for 12 V automotive battery systems with load-dump margin. |
| RDS(on) @ 10 V, 25 °C | 21.25 mΩ typ - Enables <1 W conduction loss at 5 A, reducing thermal stress in compact PCB layouts. |
| ID cont @ Tmb = 25 °C | 27 A - Continuous current capability defined at mounting base temperature, not ambient; enables accurate thermal design using PCB copper area. |
| QGD | 2.6 nC - Low gate-drain charge minimizes Miller-induced switching delay and improves hard-switching efficiency in PWM-driven loads. |
| Rth(j-mb) | 4.68 K/W - Thermal resistance measured to mounting base; allows precise junction temperature estimation from copper pad temperature in production assemblies. |
| Avalanche Energy EAS | 10 mJ (single-pulse) - Rated for inductive energy absorption without failure; supports unclamped inductive switching in transmission actuators. |
| VGS(th) @ 175 °C | >1 V - Ensures gate turn-on remains viable under worst-case thermal conditions, eliminating need for gate-boost circuitry. |
Pinout & Package
Package: LFPAK56D (SOT1205), surface-mount plastic package with exposed copper mounting base for enhanced thermal performance and mechanical robustness in automotive vibration environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | S1 | Source terminal of FET1 - electrically isolated from S2; connects directly to low-side return path for first switched load. |
| 2 | G1 | Gate terminal of FET1 - requires standard-level drive (≥4.5 V typical VGS(th) at 25 °C); decoupling capacitor recommended near PCB pad. |
| 3 | S2 | Source terminal of FET2 - independent of S1; enables dual independent low-side switches sharing common ground plane. |
| 4 | G2 | Gate terminal of FET2 - fully isolated from G1; supports asynchronous or synchronized dual-gate control strategies. |
| 5 & 6 | D2 | Drain terminal of FET2 - internally paralleled pins (pins 5 and 6) reduce bondwire inductance and improve current sharing in high-di/dt applications. |
| 7 & 8 | D1 | Drain terminal of FET1 - internally paralleled pins (pins 7 and 8) enhance pulsed current handling and reduce thermal hotspots during avalanche events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD22 standards - required for engine bay and chassis-mounted modules. |
| Repetitive avalanche rated | Rated for repeated unclamped inductive switching up to 10 mJ per pulse - eliminates need for external clamping diodes in solenoid and relay driver designs. |
| 175 °C junction rating | Enables operation in under-hood environments without derating; supports full 27 A current capability up to Tmb = 100 °C per Fig. 1. |
| True standard-level gate | VGS(th) > 1 V at 175 °C ensures compatibility with 3.3 V, 5 V, and 12 V microcontroller GPIOs without level-shifting circuitry. |
| LFPAK56D thermal performance | 4.68 K/W Rth(j-mb) enables >2× higher power density than SO8 packages - reduces PCB area by consolidating dual-FET functionality into one footprint. |
Applications
| Engine Start-Stop Control | Transmission Solenoid Driver |
|---|---|
|
Use Scenario: Managing battery disconnect and starter motor engagement in micro-hybrid vehicles during automatic engine restart. IC Role / Device Role / Timing Role: Dual low-side switch controlling starter relay coil and battery isolation contactor - each FET handles separate 12 V inductive loads with independent timing. Use Value: 175 °C rating and 10 mJ avalanche energy prevent failure during rapid restart cycles; dual integration reduces board space vs. discrete SO8 solutions. |
Use Scenario: Driving hydraulic solenoids in automatic transmission valve bodies requiring precise PWM-controlled current regulation. IC Role / Device Role / Timing Role: Dual N-channel switch implementing half-bridge configuration for bidirectional solenoid current control - FET1 and FET2 operate in complementary mode. Use Value: Low 21.25 mΩ RDS(on) minimizes I²R heating during sustained 5–10 A duty cycles; QGD = 2.6 nC enables clean 20 kHz PWM switching without shoot-through risk. |
| Electric Power Steering (EPS) Motor Phase Switch | Body Control Module (BCM) Lamp Load Management |
|
Use Scenario: High-current phase switching in brushless EPS motor inverters where space and thermal constraints limit heatsink use. IC Role / Device Role / Timing Role: Dual FET used as synchronous rectifier pair in one leg of three-phase inverter - D1/S1 and D2/S2 serve as low-side switches with shared gate drive timing. Use Value: LFPAK56D's 4.68 K/W thermal resistance allows direct copper-pad mounting on aluminum-backed PCBs, eliminating discrete heatsinks while maintaining <120 °C Tj. |
Use Scenario: Centralized control of multiple 12 V incandescent and LED lamps (headlights, interior, trunk) in modern BCMs with diagnostic feedback. IC Role / Device Role / Timing Role: Independent low-side switch for two lamp groups - FET1 drives front lighting, FET2 manages rear/interior loads with separate current sensing paths. Use Value: Dual integration reduces component count by 50% vs. two SO8 MOSFETs; VGS(th) > 1 V at 175 °C ensures fail-safe open-circuit behavior during overtemperature events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual N-channel automotive MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STL220N4F7AG | 40 V, 220 A single-chip dual N-channel in PowerFLAT 5x6; RDS(on) = 1.9 mΩ @ 10 V but requires gate driver due to 2.5 V VGS(th) min. | Higher current capacity but lacks AEC-Q101 qualification; suited for non-safety-critical industrial motor drives, not automotive. | Select when >100 A peak current needed and gate driver IC is already present; avoid for AEC-compliant designs. |
| ON Semiconductor NTMFS4C09NT1G | 40 V, 100 A single N-channel in PowerTrench® 5x6; RDS(on) = 2.1 mΩ @ 10 V; no dual-channel integration; AEC-Q101 qualified. | Requires two devices to match BUK7K25-40E's dual functionality; larger total footprint and higher assembly cost. | Choose only if system architecture mandates discrete channel isolation with separate thermal zones or fault domains. |
Compared with STL220N4F7AG and NTMFS4C09NT1G, the BUK7K25-40E uniquely combines AEC-Q101 compliance, true standard-level gate drive, integrated dual topology, and optimized LFPAK56D thermal performance - making it the only solution that satisfies start-stop, transmission, and EPS requirements without added gate drivers, layout complexity, or qualification gaps.
Availability
BUK7K25-40E is available at Aetrix Electronics and suitable for automotive body control modules, start-stop micro-hybrid systems, and electric power steering applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for Tier-1 OEM programs.
Supply support for BUK7K25-40E 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 components for automotive, industrial, and consumer markets with emphasis on efficiency, miniaturization, and quality.
The BUK7K25-40E belongs to Nexperia's TrenchMOS automotive power portfolio, designed specifically for rugged, high-temperature 12 V load switching where AEC-Q101 reliability, thermal resilience, and dual-channel integration are mandatory.
FAQ
Is BUK7K25-40E pin-compatible with other LFPAK56D dual MOSFETs?
No - BUK7K25-40E uses a unique 8-pin LFPAK56D pinout with dual drain pins (5&6 for D2, 7&8 for D1) and separate source/gate terminals. Competing dual LFPAK56D parts like BUK7K12-40E have different internal connectivity and pin assignments; PCB layout must be verified against SOT1205 mechanical drawing and electrical schematic.
What is the maximum continuous drain current at 100 °C mounting base temperature?
Per Figure 1 in the datasheet, the continuous drain current drops to 19 A at Tmb = 100 °C with VGS = 10 V. This derating reflects thermal limits of the LFPAK56D package and must be applied in thermal simulations using Rth(j-mb) = 4.68 K/W and actual copper pad temperature measurements.
Does BUK7K25-40E support paralleling of its two FETs for higher current?
No - the two N-channel MOSFETs are electrically isolated; their sources, gates, and drains are separate. Paralleling would require external gate/source/drain interconnection and matching, which voids AEC-Q101 qualification and risks thermal imbalance. Use as independent switches only.
Can BUK7K25-40E replace a single SO8 MOSFET in existing designs?
Only if the design requires dual switching and can accommodate the LFPAK56D footprint (4.7 × 3.5 mm). Its dual-channel function cannot be substituted by a single SO8 device without redesigning control logic, PCB layout, and thermal management - it replaces two SO8 MOSFETs, not one.
BUK7K25-40E,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- TrenchMOS™
- Package/Case:
- SOT-1205, 8-LFPAK56
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- MOSFET (Metal Oxide)
- Configuration:
- 2 N-Channel (Dual)
- FET Feature:
- -
- Drain to Source Voltage (Vdss):
- 40V
- Current - Continuous Drain (Id) @ 25°C:
- 27A
- Rds On (Max) @ Id, Vgs:
- 25mOhm @ 5A, 10V
- Vgs(th) (Max) @ Id:
- 4V @ 1mA
- Gate Charge (Qg) (Max) @ Vgs:
- 7.9nC @ 10V
- Input Capacitance (Ciss) (Max) @ Vds:
- 525pF @ 25V
- Power - Max:
- 32W
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- LFPAK56D
BUK7K25-40E,115 FAQ
1.How can I place an order for BUK7K25-40E,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BUK7K25-40E,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 BUK7K25-40E,115 reliable?
The price and inventory of BUK7K25-40E,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK7K25-40E,115 is usually 5 days.
3.What payment methods are accepted for BUK7K25-40E,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK7K25-40E,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUK7K25-40E,115?
BUK7K25-40E,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUK7K25-40E,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 BUK7K25-40E,115?
For technical support, including BUK7K25-40E,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK7K25-40E,115 requirements.
6.How does Aetrix verify that BUK7K25-40E,115 is sourced from the original manufacturer or authorized distributors?
All BUK7K25-40E,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 BUK7K25-40E,115 meets industry standards.
7.What is the process for return or replacement of BUK7K25-40E,115?
All BUK7K25-40E,115 units undergo pre-shipment inspection (PSI). If there is an issue with BUK7K25-40E,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 BUK7K25-40E,115 part is unused and in its original packaging.
Return procedure for BUK7K25-40E,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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