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Nexperia USA Inc. BUK7K18-40EX
- Part No.:
- BUK7K18-40EX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- FET, MOSFET Arrays
- Package:
- SOT-1205, 8-LFPAK56
- Datasheet:
-
BUK7K18-40EX.pdf
- Description:
- MOSFET 2N-CH 40V 24.2A LFPAK56D
- Quantity:
- Payment:
- Shipping:
Inventory:1,500
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Product details
Overview
BUK7K18-40EX from Nexperia is a dual N-channel standard-level MOSFET in LFPAK56D (SOT1205) package, rated for 40 V drain-source voltage, 19 mΩ RDS(on) at 10 VGS/25 °C, and qualified to AEC-Q101 for automotive use. It integrates two independent power switches in one thermally robust package, enabling compact high-current switching in 12 V vehicle subsystems such as transmission control and lamp drivers.
For engineers reviewing the BUK7K18-40EX datasheet, BUK7K18-40EX pinout, BUK7K18-40EX application, or BUK7K18-40EX equivalent, key selection criteria include its 175 °C junction rating, repetitive avalanche capability, true standard-level gate threshold (>1 V at 175 °C), and dual-drain configuration optimized for space-constrained automotive PCB layouts.
Technical Context
This device implements TrenchMOS technology in a dual-die LFPAK56D package with shared mounting base, delivering low thermal resistance (Rth(j-mb) = 3.96 K/W) and high power density (38 W at Tmb = 25 °C). Its dual-channel architecture supports independent gate control (G1/S1/D1 and G2/S2/D2), enabling synchronous or complementary switching without cross-conduction risk.
The MOSFET features a robust 40 V VDS rating with 26.3 mJ non-repetitive avalanche energy, 127 A peak drain current, and stable RDS(on) performance up to 175 °C (30.5–37.4 mΩ). Gate charge parameters-QG(tot) = 11.8 nC, QGD = 4.3 nC-support fast, efficient switching in PWM-driven loads like solenoids and motors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 40 V - Maximum continuous drain-source blocking voltage compatible with 12 V automotive systems including load dump transients. |
| RDS(on) | 15.5–19 mΩ @ 10 VGS, 25 °C - Low conduction loss enabling <1.9 W dissipation at 10 A DC, critical for thermally demanding under-hood applications. |
| ID | 24.2 A @ Tmb = 25 °C - Continuous drain current rating defined at mounting base temperature, not ambient, reflecting real-world heatsink-coupled operation. |
| Tj max | 175 °C - Junction temperature limit supporting operation in engine bay environments without derating below full current. |
| QGD | 4.3 nC - Gate-drain charge determining Miller plateau duration; enables predictable 7.9 ns turn-off delay and 10 ns fall time with 5 Ω gate resistor. |
| EAS | 26.3 mJ - Single-pulse avalanche energy rating, allowing safe operation during inductive flyback events in motor/solenoid drive without external snubbers. |
| Rth(j-mb) | 3.96 K/W - Thermal resistance from junction to mounting base, enabling direct thermal coupling to metal-core PCBs or heatsinks for high-power density designs. |
Pinout & Package
Package: LFPAK56D (SOT1205), 8-lead plastic surface-mount package with exposed copper mounting base for enhanced thermal and electrical performance. Dimensions: 4.7 × 3.5 × 1.3 mm (L × W × H), with 1.27 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | S1 | Source terminal of FET1 - electrically isolated from S2; connects to low-side return path for first channel. |
| 2 | G1 | Gate terminal of FET1 - controls turn-on/turn-off of first MOSFET independently; requires standard 10 V drive. |
| 3 | S2 | Source terminal of FET2 - separate from S1; enables dual independent low-side switches or half-bridge configurations. |
| 4 | G2 | Gate terminal of FET2 - fully independent gate input; allows asynchronous or phase-shifted control of second channel. |
| 5 & 6 | D2 | Drain terminals of FET2 - internally paralleled pins (pins 5 and 6) reduce package inductance and improve current sharing for high-frequency switching. |
| 7 & 8 | D1 | Drain terminals of FET1 - internally paralleled pins (pins 7 and 8) provide low-inductance, high-current drain connection for first channel. |
Key Features
| Feature | Design Value |
|---|---|
| Dual N-channel topology | Two independent MOSFETs in single LFPAK56D package reduce board area by >40% vs discrete SO-8 solutions while maintaining isolation between channels. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock-enabling use in transmission control modules and body ECUs. |
| Repetitive avalanche rated | Guaranteed operation under repeated inductive switching stress (e.g., solenoid coil de-energization), eliminating need for external clamping diodes in many designs. |
| 175 °C junction rating | Enables uninterrupted 24.2 A operation at mounting base temperatures up to 100 °C, supporting placement near heat sources without forced cooling. |
| True standard-level gate | VGS(th) >1 V at 175 °C ensures reliable turn-on with standard 5 V or 10 V microcontroller GPIOs-even under worst-case thermal conditions. |
Applications
| Transmission Control Valve Driver | Lamp Load Switching Module |
|---|---|
|
Use Scenario: Driving 12 V hydraulic solenoid valves in automatic transmission control units where space, thermal margin, and EMI are critical. IC Role / Device Role / Timing Role: Dual low-side switch controlling two independent valve coils; each FET handles 15–20 A pulsed current with 100 µs–10 ms on-time. Use Value: Integrated dual configuration eliminates layout complexity of two discrete MOSFETs; 3.96 K/W Rth(j-mb) sustains 100 °C Tmb during sustained duty cycles. |
Use Scenario: High-reliability headlight and fog lamp switching in modern LED+halogen hybrid lighting systems. IC Role / Device Role / Timing Role: Low-side power switch managing up to 24 A resistive load; handles cold inrush and PWM dimming up to 2 kHz. Use Value: 40 V VDS withstands ISO 7637-2 pulse 5a (load dump); 26.3 mJ EAS absorbs inductive kickback from filament lamp filaments. |
| Engine Cooling Fan Controller | Start-Stop System Solenoid Interface |
|
Use Scenario: PWM-controlled radiator fan driver in 12 V start-stop vehicles requiring silent, variable-speed operation across wide temperature range. IC Role / Device Role / Timing Role: High-efficiency half-bridge low-side switch (with external high-side) operating at 20 kHz switching frequency. Use Value: Low QGD (4.3 nC) and fast switching (tf = 10 ns) minimize switching losses; 175 °C rating prevents thermal shutdown during summer idle conditions. |
Use Scenario: Engagement/disengagement control of starter motor solenoid and battery disconnect relays in micro-hybrid architectures. IC Role / Device Role / Timing Role: Robust low-side driver handling 127 A peak inrush current during cranking, with precise timing control for relay coil energization. Use Value: 127 A IDM peak rating and 19 mΩ RDS(on) ensure minimal voltage drop (<0.25 V) during cranking, preserving control logic supply stability. |
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 |
|---|---|---|---|
| STLD200N4F6AG | Single-channel 40 V, 2.2 mΩ MOSFET in PowerFLAT 5x6; no dual configuration; lower RDS(on) but requires two devices for same functionality. | Requires duplicated layout and gate drive circuitry; lacks integrated thermal coupling between channels. | Select when ultra-low conduction loss dominates over board area and thermal synergy requirements. |
| ONSEMI NTMFS4C023NT1G | Dual N-channel 30 V, 2.3 mΩ in PowerSO-8; lower voltage rating limits use to ≤16 V systems; higher gate charge (QG = 22 nC). | Not suitable for 40 V load dump compliance; slower switching increases losses in high-frequency PWM. | Consider only for non-automotive 12 V industrial applications where AEC-Q101 is not required. |
Compared with STLD200N4F6AG and NTMFS4C023NT1G, the BUK7K18-40EX uniquely delivers dual-channel integration, AEC-Q101 qualification, and 40 V ruggedness in a thermally optimized LFPAK56D package-making it the only solution that simultaneously satisfies space, reliability, and transient immunity requirements in automotive power distribution modules.
Availability
BUK7K18-40EX is available at Aetrix Electronics and suitable for automotive transmission control, engine cooling fan management, headlamp load switching, and start-stop solenoid interface applications requiring stable component supply across extended production lifecycles.
Supply support for BUK7K18-40EX 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 high-volume, high-reliability essential semiconductors-including MOSFETs, diodes, ESD protection, and logic ICs-with manufacturing rooted in process excellence and automotive-grade quality systems.
The BUK7K series belongs to Nexperia's AEC-Q101-qualified standard-level MOSFET product line, engineered specifically for thermally aggressive 12 V automotive power switching applications where dual-channel integration, avalanche ruggedness, and long-term reliability are mandatory.
FAQ
What is the maximum continuous drain current for BUK7K18-40EX at 100 °C mounting base temperature?
At Tmb = 100 °C, the continuous drain current is 22 A per channel, as specified in Table 5 (Limiting values) of the datasheet. This derating reflects thermal constraints of the LFPAK56D package and ensures junction temperature remains ≤175 °C under steady-state conduction.
Can BUK7K18-40EX be used in a half-bridge configuration?
Yes-BUK7K18-40EX supports half-bridge topologies when used as the low-side switch paired with an external high-side driver. Its dual independent channels allow one FET to serve as low-side switch while the other remains unused or implements auxiliary functions such as current sensing or redundancy.
Is the gate threshold voltage stable across temperature?
Yes-the gate-source threshold voltage remains >1 V up to 175 °C junction temperature (Fig. 10), confirming true standard-level behavior. At 25 °C, VGS(th) ranges from 2.4 V to 4.5 V (min to max), ensuring compatibility with 3.3 V and 5 V logic controllers even under thermal stress.
Does BUK7K18-40EX include integrated body diodes?
Yes-each channel includes a monolithic source-drain diode with typical forward voltage of 0.83 V at 10 A and 25 °C (Table 7). These diodes support freewheeling in inductive loads and are characterized for reverse recovery time (trr = 16.8 ns) and recovered charge (Qr = 9.1 nC).
BUK7K18-40EX 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:
- -
- Drain to Source Voltage (Vdss):
- 40V
- Current - Continuous Drain (Id) @ 25°C:
- 24.2A
- Rds On (Max) @ Id, Vgs:
- 19mOhm @ 10A, 10V
- Vgs(th) (Max) @ Id:
- 4V @ 1mA
- Gate Charge (Qg) (Max) @ Vgs:
- 11.8nC @ 10V
- Input Capacitance (Ciss) (Max) @ Vds:
- 808pF @ 25V
- Power - Max:
- 38W
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- LFPAK56D
BUK7K18-40EX FAQ
1.How can I place an order for BUK7K18-40EX through Aetrix?
Please submit a Request for Quotation (RFQ) for BUK7K18-40EX 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 BUK7K18-40EX reliable?
The price and inventory of BUK7K18-40EX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK7K18-40EX is usually 5 days.
3.What payment methods are accepted for BUK7K18-40EX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK7K18-40EX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUK7K18-40EX?
BUK7K18-40EX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUK7K18-40EX 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 BUK7K18-40EX?
For technical support, including BUK7K18-40EX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK7K18-40EX requirements.
6.How does Aetrix verify that BUK7K18-40EX is sourced from the original manufacturer or authorized distributors?
All BUK7K18-40EX 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 BUK7K18-40EX meets industry standards.
7.What is the process for return or replacement of BUK7K18-40EX?
All BUK7K18-40EX units undergo pre-shipment inspection (PSI). If there is an issue with BUK7K18-40EX, 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 BUK7K18-40EX part is unused and in its original packaging.
Return procedure for BUK7K18-40EX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BUK7K18-40EX Tags
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2N7002BKS,115
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