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Nexperia USA Inc. BUK9K6R8-40EX
- Part No.:
- BUK9K6R8-40EX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- FET, MOSFET Arrays
- Package:
- SOT-1205, 8-LFPAK56
- Datasheet:
-
BUK9K6R8-40EX.pdf
- Description:
- MOSFET 2N-CH 40V 40A LFPAK56D
- Quantity:
- Payment:
- Shipping:
Inventory:5,790
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Product details
Overview
BUK9K6R8-40EX from Nexperia is a dual N-channel logic-level MOSFET in LFPAK56D (SOT1205) package, rated for 40 V VDS, 7.2 mΩ RDS(on) at VGS = 5 V and Tj = 25 °C, and qualified to AEC-Q101 for automotive use. It delivers 40 A continuous drain current at Tmb = 25 °C and supports thermally demanding applications up to 175 °C junction temperature - deployed in transmission control and 12 V solenoid switching.
For engineers reviewing the BUK9K6R8-40EX datasheet, BUK9K6R8-40EX pinout, BUK9K6R8-40EX application, or BUK9K6R8-40EX equivalent, key selection criteria include its dual-channel layout, true logic-level gate drive (VGS(th) > 0.5 V at 175 °C), repetitive avalanche rating, and 2.36 K/W junction-to-mounting-base thermal resistance.
Technical Context
This device integrates two independent N-channel TrenchMOS transistors in a single LFPAK56D package, sharing no internal connection between channels. Each FET features a gate threshold voltage of 1.4–2.1 V at 25 °C and maintains functional gate control down to 0.5 V at 175 °C, enabling robust low-voltage drive in automotive microcontroller environments.
It supports pulsed peak drain currents up to 265 A (tp ≤ 10 µs), exhibits 6.8 nC QGD and 22.2 nC QG(tot), and delivers 125 mJ non-repetitive avalanche energy under defined test conditions - confirming ruggedness for inductive load switching in safety-critical vehicle subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 40 V maximum - defines safe blocking capability in 12 V automotive systems with load-dump transients. |
| RDS(on) | 7.2 mΩ typical at VGS = 5 V, Tj = 25 °C - enables <1.8 W conduction loss at 15 A, reducing heatsink requirements. |
| ID (continuous) | 40 A at Tmb = 25 °C - supports high-current motor/solenoid drivers without derating below 100 °C mounting base. |
| Tj max | 175 °C - allows operation in engine bay or transmission control units without thermal shutdown. |
| Rth(j-mb) | 2.36 K/W - enables direct thermal coupling to PCB copper or heatsink, critical for sustained power dissipation. |
| Avalanche energy | 125 mJ (non-repetitive) - protects against inductive kickback in transmission valve coils and lamp ballasts. |
| VGS(th) @ 175 °C | > 0.5 V - ensures reliable turn-on with standard 3.3 V/5 V MCU GPIOs across full temperature range. |
Pinout & Package
LFPAK56D (SOT1205) is a thermally enhanced surface-mount package with exposed mounting base, optimized for high-power density and low-inductance layout. Its 8-lead configuration supports dual independent MOSFETs with shared thermal path and separate source/gate/drain terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | S1 | Source terminal of FET1 - connects to low-side return path; electrically isolated from S2. |
| 2 | G1 | Gate terminal of FET1 - requires <100 nA leakage control; driven by MCU PWM or driver IC. |
| 3 | S2 | Source terminal of FET2 - independent return node; enables dual-switch topologies like half-bridge legs. |
| 4 | G2 | Gate terminal of FET2 - fully decoupled from G1; supports asynchronous or complementary control. |
| 5 & 6 | D2 | Drain terminal of FET2 - paralleled pins reduce bondwire inductance and improve current sharing. |
| 7 & 8 | D1 | Drain terminal of FET1 - paralleled pins enhance surge current handling and thermal spreading. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent N-channel topology | Enables compact dual-load control (e.g., bidirectional motor drive or redundant solenoid actuation) without external isolation. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TC, and ESD testing - suitable for ASIL-B system components. |
| Repetitive avalanche rated | Withstands repeated inductive energy spikes without degradation - eliminates need for external snubbers in valve coil drivers. |
| 175 °C junction rating | Supports placement near heat sources (e.g., transmission ECUs) without derating or forced cooling. |
| True logic-level gate | VGS(th) remains >0.5 V at 175 °C - guarantees turn-on margin with 3.3 V microcontrollers under worst-case thermal stress. |
Applications
| Transmission Control Valve Driver | 12 V Automotive Lamp Dimming |
|---|---|
|
Use Scenario: Driving electromagnetic shift solenoids in automatic transmissions where pulse-width modulated current regulates hydraulic pressure. IC Role / Device Role / Timing Role: High-side or low-side switch controlling 12 V, 2–5 A solenoid loads with 10–100 Hz PWM frequency and fast current rise/fall. Use Value: Low RDS(on) minimizes I²R heating during sustained duty cycles; avalanche rating absorbs back-EMF without clamping diodes. |
Use Scenario: PWM-controlled dimming of halogen or LED headlamps in body control modules with thermal constraints. IC Role / Device Role / Timing Role: Low-side switch modulating lamp current at 200–1000 Hz to achieve smooth brightness control without audible noise. Use Value: 7.2 mΩ RDS(on) limits conduction loss to <1.1 W at 12 A, enabling direct PCB copper heatsinking instead of discrete heatsinks. |
| Engine Cooling Fan Controller | Electric Power Steering (EPS) Motor Phase Switch |
|
Use Scenario: Controlling brushless DC fan motors in engine cooling circuits requiring high-current, thermally robust switching. IC Role / Device Role / Timing Role: Half-bridge low-side switch in 3-phase inverter stage, handling 20–35 A peak currents with 20 kHz PWM. Use Value: Dual-channel integration reduces board space vs. discrete MOSFETs; 2.36 K/W Rth(j-mb) sustains 40 A continuous at Tmb ≤ 100 °C. |
Use Scenario: High-reliability phase-leg switching in EPS motor inverters where failure modes impact steering assist functionality. IC Role / Device Role / Timing Role: One channel used as high-side, one as low-side in a half-bridge configuration with shoot-through protection. Use Value: AEC-Q101 qualification and 125 mJ avalanche energy ensure fault tolerance during motor stall or short-circuit events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual N-channel MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Infineon BSC014N04LS6 | Single-channel 40 V, 1.4 mΩ MOSFET in SuperSO8; higher RDS(on) per channel than BUK9K6R8-40EX's dual configuration. | Requires two devices for dual-load control; lacks integrated dual topology and AEC-Q101 qualification. | Prefer when ultra-low on-resistance per channel outweighs board space and qualification needs. |
| ON Semiconductor NTMFS4C09NT1G | Dual N-channel 40 V, 9.5 mΩ in PowerTDFN; lower thermal resistance (1.8 K/W) but unqualified for automotive use. | Not AEC-Q101 rated; limited to industrial or consumer applications with relaxed reliability requirements. | Choose only for cost-sensitive non-automotive designs where 175 °C operation and automotive validation are unnecessary. |
Compared with BSC014N04LS6 and NTMFS4C09NT1G, the BUK9K6R8-40EX uniquely combines dual-channel integration, AEC-Q101 qualification, and guaranteed 0.5 V VGS(th) at 175 °C - making it the only option for space-constrained, thermally aggressive automotive subsystems requiring functional safety alignment.
Availability
BUK9K6R8-40EX is available at Aetrix Electronics and suitable for automotive transmission control, 12 V lamp dimming, and electric power steering motor control requiring stable component supply across extended production lifecycles.
Supply support for BUK9K6R8-40EX 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 specializing in high-performance, high-reliability discrete and logic devices, with leadership in automotive-qualified MOSFETs and ESD protection solutions.
The BUK9K6R8-40EX belongs to Nexperia's Automotive Logic Level MOSFET product line, engineered specifically for thermally constrained, safety-conscious automotive power switching applications such as solenoid, lamp, and motor control.
FAQ
Is BUK9K6R8-40EX pin-compatible with other LFPAK56D dual MOSFETs?
No - BUK9K6R8-40EX uses a unique pin assignment (S1-G1-S2-G2-D2-D2-D1-D1) optimized for thermal symmetry and low-inductance layout. Other LFPAK56D dual MOSFETs may share the same package outline but differ in pin function mapping, especially drain/source pairing and gate isolation. Always verify pinout using Table 2 in the official datasheet before PCB layout.
What is the maximum allowable gate drive voltage for reliable operation?
The absolute maximum VGS is ±10 V per channel, as specified in Table 5. Operation above +10 V risks permanent gate oxide damage, while negative gate voltage beyond –10 V can cause threshold instability. For logic-level compatibility, 5 V drive is recommended - delivering full RDS(on) performance while maintaining margin against overvoltage transients in automotive 12 V systems.
Can BUK9K6R8-40EX be used in synchronous rectification applications?
Yes - its low RDS(on) (7.2 mΩ typ.), fast switching parameters (tr = 22 ns, tf = 20 ns), and integrated body diode with 23 ns reverse recovery time make it suitable for synchronous rectification in 12 V DC-DC converters. However, body diode forward voltage (0.78 V typ. at 25 A) must be evaluated against Schottky alternatives for efficiency-critical designs below 5 A load.
Does the device require external gate resistors for automotive PWM switching?
Yes - a series gate resistor (typically 5–22 Ω) is required to damp ringing, limit peak gate current, and control dV/dt during switching. The datasheet specifies test conditions with RG(ext) = 5 Ω; increasing this value slows switching to reduce EMI but increases switching losses. Layout must minimize gate loop inductance, especially in high-frequency (>10 kHz) PWM applications like EPS motor control.
BUK9K6R8-40EX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SOT-1205, 8-LFPAK56
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- MOSFET (Metal Oxide)
- Configuration:
- 2 N-Channel (Dual)
- FET Feature:
- Logic Level Gate
- Drain to Source Voltage (Vdss):
- 40V
- Current - Continuous Drain (Id) @ 25°C:
- 40A
- Rds On (Max) @ Id, Vgs:
- 6.1mOhm @ 10A, 10V
- Vgs(th) (Max) @ Id:
- 2.1V @ 1mA
- Gate Charge (Qg) (Max) @ Vgs:
- 22.2nC @ 5V
- Input Capacitance (Ciss) (Max) @ Vds:
- 3000pF @ 25V
- Power - Max:
- 64W
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- LFPAK56D
BUK9K6R8-40EX FAQ
1.How can I place an order for BUK9K6R8-40EX through Aetrix?
Please submit a Request for Quotation (RFQ) for BUK9K6R8-40EX 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 BUK9K6R8-40EX reliable?
The price and inventory of BUK9K6R8-40EX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9K6R8-40EX is usually 5 days.
3.What payment methods are accepted for BUK9K6R8-40EX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK9K6R8-40EX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUK9K6R8-40EX?
BUK9K6R8-40EX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUK9K6R8-40EX 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 BUK9K6R8-40EX?
For technical support, including BUK9K6R8-40EX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9K6R8-40EX requirements.
6.How does Aetrix verify that BUK9K6R8-40EX is sourced from the original manufacturer or authorized distributors?
All BUK9K6R8-40EX 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 BUK9K6R8-40EX meets industry standards.
7.What is the process for return or replacement of BUK9K6R8-40EX?
All BUK9K6R8-40EX units undergo pre-shipment inspection (PSI). If there is an issue with BUK9K6R8-40EX, 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 BUK9K6R8-40EX part is unused and in its original packaging.
Return procedure for BUK9K6R8-40EX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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