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Nexperia USA Inc. BUK7K6R8-40E/1X
- Part No.:
- BUK7K6R8-40E/1X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- FET, MOSFET Arrays
- Package:
- SOT-1205, 8-LFPAK56
- Datasheet:
-
BUK7K6R8-40E/1X.pdf
- Description:
- MOSFET 40V 40A LFPAK56D
- Quantity:
- Payment:
- Shipping:
Inventory:8,497
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Product details
Overview
BUK7K6R8-40E from Nexperia is a dual N-channel standard-level MOSFET in LFPAK56D (SOT1205) package, rated for 40 V VDS, 6.8 mΩ RDS(on) at 10 V VGS and 25 °C, and qualified to AEC-Q101 for automotive use. It delivers 40 A continuous drain current at Tmb = 25 °C, supports repetitive avalanche operation, and operates up to 175 °C junction temperature - deployed in transmission control and high-reliability 12 V automotive power switching.
For engineers reviewing the BUK7K6R8-40E datasheet, BUK7K6R8-40E pinout, BUK7K6R8-40E application, or BUK7K6R8-40E equivalent, key selection criteria include its dual-FET integration in a thermally enhanced LFPAK56D package, true standard-level gate drive (VGS(th) > 1 V at 175 °C), and AEC-Q101 qualification for under-hood automotive systems.
Technical Context
This device integrates two identical N-channel TrenchMOS transistors in a single LFPAK56D package with shared thermal path to mounting base (Rth(j-mb) = 2.36 K/W). Each FET features independent gate and source terminals, with paralleled drain connections per channel (pins 5&6 = D2, pins 7&8 = D1), enabling dual independent switching or parallel configuration.
It operates as a standard-level gate device - requiring ≥10 V VGS for full enhancement - and maintains RDS(on) ≤13.4 mΩ at 175 °C, supporting stable performance in thermally demanding environments. Its 130 mJ single-pulse avalanche energy rating (EDS(AL)S) and 276 A peak drain current support robust fault handling in motor and solenoid drive circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 40 V - Maximum drain-source blocking voltage; defines safe operation in 12 V automotive systems with load-dump transients. |
| RDS(on) | 6.8 mΩ @ VGS = 10 V, ID = 20 A, Tj = 25 °C - Low conduction loss enables high-efficiency power switching at rated current. |
| ID (cont) | 40 A @ Tmb = 25 °C - Continuous current capability limited by thermal resistance to mounting base (2.36 K/W). |
| QGD | 9.1 nC - Gate-drain charge determines switching speed and Miller-effect immunity during hard-switching. |
| Tj max | 175 °C - Junction temperature rating enables deployment in engine bay and transmission control modules. |
| VGS(th) | ≥1 V @ Tj = 175 °C - Ensures reliable turn-on with standard 5 V or 12 V logic-level gate drivers across full temperature range. |
| EDS(AL)S | 130 mJ - Single-pulse avalanche energy rating supports ruggedness against inductive kickback in motor/solenoid loads. |
Pinout & Package
LFPAK56D (SOT1205) is a thermally optimized surface-mount package with exposed copper mounting base for low Rth(j-mb). It features 8 leads in dual-power-SO8 footprint, with dual drain terminals per channel for current sharing and reduced parasitic inductance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | S1 | Source terminal of FET1 - referenced to low-side switch node; electrically isolated from S2. |
| 2 | G1 | Gate terminal of FET1 - controls turn-on/turn-off of first MOSFET independently. |
| 3 | S2 | Source terminal of FET2 - referenced to second low-side switch node; isolated from S1. |
| 4 | G2 | Gate terminal of FET2 - enables independent control of second MOSFET for dual-load or phase-shifted operation. |
| 5 & 6 | D2 | Drain terminals of FET2 - paralleled for lower effective drain inductance and higher current capacity. |
| 7 & 8 | D1 | Drain terminals of FET1 - paralleled for reduced thermal resistance and improved current sharing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent N-channel MOSFETs | Enables compact dual-load control (e.g., H-bridge half-bridge or dual solenoid drivers) without discrete layout overhead. |
| AEC-Q101 qualified | Validated for automotive applications including transmission control and engine management systems per stress test requirements. |
| Repetitive avalanche rated | Supports repeated inductive energy dissipation without degradation - critical for brushed DC motor commutation. |
| 175 °C maximum junction temperature | Allows direct placement near heat sources (e.g., gearbox actuators) without derating beyond ambient limits. |
| True standard-level gate | VGS(th) > 1 V at 175 °C ensures turn-on compatibility with common 5 V/12 V microcontroller outputs and gate drivers. |
Applications
| Transmission Control Module | Engine Cooling Fan Driver |
|---|---|
|
Use Scenario: High-current switching of electromagnetic shift solenoids and clutch actuators in automatic transmissions. IC Role / Device Role / Timing Role: Dual low-side switch controlling two independent solenoid coils with synchronized or staggered activation. Use Value: 6.8 mΩ RDS(on) minimizes I²R heating during sustained 20–30 A coil currents; 175 °C rating sustains operation near hot gearbox housing. |
Use Scenario: PWM-controlled 12 V DC brushless cooling fan in engine bay with rapid thermal cycling. IC Role / Device Role / Timing Role: Low-side power switch modulating fan motor current; leverages dual-FET structure for redundant control or split-phase drive. Use Value: Repetitive avalanche rating absorbs back-EMF spikes during PWM turn-off; 2.36 K/W Rth(j-mb) enables direct PCB copper pad heatsinking. |
| Body Control Unit (BCU) | Start-Stop System Relay Replacement |
|
Use Scenario: Centralized control of lighting, door locks, and window lift motors in modern vehicle body electronics. IC Role / Device Role / Timing Role: Dual-channel load switch replacing mechanical relays for lamp and motor loads with diagnostics capability. Use Value: Independent G1/G2 control allows real-time current monitoring per channel; QGD = 9.1 nC enables fast, low-loss switching at 1–10 kHz PWM frequencies. |
Use Scenario: Solid-state replacement of starter relay in 12 V start-stop systems requiring >30,000 cycle life. IC Role / Device Role / Timing Role: High-reliability low-side switch for starter motor engagement, with integrated avalanche protection. Use Value: 130 mJ EDS(AL)S withstands repeated inductive turn-off stress; AEC-Q101 qualification ensures long-term reliability under vibration and thermal shock. |
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, 2.2 mΩ RDS(on), 175 °C, PowerFLAT 5x6 package; lower RDS(on) but no avalanche rating. | Higher efficiency in continuous conduction mode; unsuitable for inductive load switching without external clamping. | Select when ultra-low conduction loss dominates over ruggedness; requires external TVS for solenoid/motor flyback. |
| ON Semiconductor NTMFS5C675NL | 40 V, 5.2 mΩ RDS(on), 175 °C, SO-8FL package; AEC-Q101 qualified, but not repetitive avalanche rated. | Better thermal performance than SO-8 but lacks built-in avalanche energy margin for unclamped inductive loads. | Prefer for space-constrained BCU designs where layout allows external protection; verify SOA against peak current demands. |
Compared with STL220N4F7AG and NTMFS5C675NL, the BUK7K6R8-40E uniquely combines AEC-Q101 qualification, repetitive avalanche rating, and dual-FET integration in a thermally superior LFPAK56D package - making it optimal for safety-critical, thermally aggressive automotive power stages where reliability trumps marginal RDS(on) reduction.
Availability
BUK7K6R8-40E is available at Aetrix Electronics and suitable for automotive transmission control, engine cooling systems, and body control unit designs requiring stable component supply, AEC-Q101 compliance, and high-temperature operational integrity.
Supply support for BUK7K6R8-40E 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 high-volume, high-reliability essential semiconductors - delivering discrete, logic, and MOSFET solutions optimized for automotive, industrial, and consumer applications.
The BUK7K6R8-40E belongs to Nexperia's AEC-Q101-qualified TrenchMOS automotive power portfolio, engineered specifically for robust, thermally resilient switching in 12 V vehicle subsystems such as transmission, chassis, and body electronics.
FAQ
Is BUK7K6R8-40E pin-compatible with other LFPAK56D dual-MOSFETs?
No - while all LFPAK56D packages share the same SOT1205 outline, pin assignments vary by part number. BUK7K6R8-40E uses dedicated S1/G1/S2/G2/D1/D2 routing (pins 1–4, 5&6, 7&8); cross-checking datasheets is required before substitution. Pin 5 and 6 are both D2; pins 7 and 8 are both D1 - this dual-drain configuration is specific to this device's internal die layout.
What is the maximum recommended PCB copper area for thermal performance?
For optimal thermal performance, Nexperia recommends a minimum 200 mm² copper pad connected to the mounting base (exposed drain tab) with ≥4 thermal vias (0.3 mm diameter, filled or plated) to inner ground/power planes. This achieves near-datasheet Rth(j-mb) = 2.36 K/W; reducing pad area increases junction temperature disproportionately above 100 mm².
Does BUK7K6R8-40E support 3.3 V gate drive?
No - it is a standard-level MOSFET with VGS(th) ≥1 V only at 175 °C; typical VGS(th) is 2.4–4.5 V at 25 °C. Driving with 3.3 V results in partial turn-on, high RDS(on), and thermal runaway. A 10 V gate driver (e.g., TC4427, UCC27531) is required for full enhancement and specified 6.8 mΩ performance.
Can FET1 and FET2 be used in parallel for higher current?
Yes - both FETs share identical characteristics (RDS(on), QG, Ciss) and thermal coupling via the common mounting base. When paralleled with matched gate drive paths, they deliver up to 80 A continuous current at Tmb = 25 °C. Layout must ensure symmetrical trace lengths and thermal mass to avoid current imbalance.
BUK7K6R8-40E/1X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SOT-1205, 8-LFPAK56
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Technology:
- -
- Configuration:
- -
- FET Feature:
- -
- Drain to Source Voltage (Vdss):
- 40V
- Current - Continuous Drain (Id) @ 25°C:
- 40A (Ta)
- Rds On (Max) @ Id, Vgs:
- 6.8mOhm @ 20A, 10V
- Vgs(th) (Max) @ Id:
- 4V @ 1mA
- Gate Charge (Qg) (Max) @ Vgs:
- 28.9nC @ 10V
- Input Capacitance (Ciss) (Max) @ Vds:
- 1947pF @ 25V
- Power - Max:
- 64W (Ta)
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- LFPAK56D
BUK7K6R8-40E/1X FAQ
1.How can I place an order for BUK7K6R8-40E/1X through Aetrix?
Please submit a Request for Quotation (RFQ) for BUK7K6R8-40E/1X 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 BUK7K6R8-40E/1X reliable?
The price and inventory of BUK7K6R8-40E/1X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK7K6R8-40E/1X is usually 5 days.
3.What payment methods are accepted for BUK7K6R8-40E/1X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK7K6R8-40E/1X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUK7K6R8-40E/1X?
BUK7K6R8-40E/1X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUK7K6R8-40E/1X 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 BUK7K6R8-40E/1X?
For technical support, including BUK7K6R8-40E/1X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK7K6R8-40E/1X requirements.
6.How does Aetrix verify that BUK7K6R8-40E/1X is sourced from the original manufacturer or authorized distributors?
All BUK7K6R8-40E/1X 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 BUK7K6R8-40E/1X meets industry standards.
7.What is the process for return or replacement of BUK7K6R8-40E/1X?
All BUK7K6R8-40E/1X units undergo pre-shipment inspection (PSI). If there is an issue with BUK7K6R8-40E/1X, 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 BUK7K6R8-40E/1X part is unused and in its original packaging.
Return procedure for BUK7K6R8-40E/1X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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