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Nexperia USA Inc. BUK9K25-40E/1X
- Part No.:
- BUK9K25-40E/1X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- FET, MOSFET Arrays
- Package:
- SOT-1205, 8-LFPAK56
- Datasheet:
-
BUK9K25-40E/1X.pdf
- Description:
- MOSFET 40V 18.2A LFPAK56D
- Quantity:
- Payment:
- Shipping:
Inventory:3,205
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Product details
Overview
BUK9K25-40E from Nexperia is a dual N-channel logic-level MOSFET in LFPAK56D (SOT1205) package, rated for 40 V drain-source voltage, 29 mΩ RDS(on) at VGS = 5 V and Tj = 25 °C, and qualified to AEC-Q101 for automotive use. It delivers 18.2 A continuous drain current at Tmb = 25 °C and supports thermally demanding 12 V automotive power switching applications including transmission control and solenoid drivers.
For engineers reviewing the BUK9K25-40E datasheet, BUK9K25-40E pinout, BUK9K25-40E application, or BUK9K25-40E equivalent, this page provides verified technical context, validated pin functions, real-world automotive use cases, thermal performance data, and AEC-Q101-compliant alternative options - all grounded in the official Nexperia product data sheet dated 10 December 2013.
Technical Context
This dual MOSFET integrates two independent N-channel TrenchMOS devices in a single LFPAK56D package, sharing no internal connection between FET1 and FET2. Each channel features true logic-level gate drive with VGS(th) > 0.5 V at Tj = 175 °C and is rated for repetitive avalanche energy up to 15 mJ.
Thermal design is enabled by a low Rth(j-mb) of 4.68 K/W and a maximum junction temperature of 175 °C, supporting operation in high-ambient under-hood environments. The device exhibits 2.4 nC QGD, 6.3 nC QG(tot), and 528–701 pF Ciss, enabling fast switching in 12 V automotive power stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 40 V - Maximum blocking voltage compatible with 12 V automotive battery systems with load dump margin. |
| RDS(on) | 24–29 mΩ @ VGS = 5 V, Tj = 25 °C - Enables low conduction loss in high-current motor/solenoid drivers. |
| ID | 18.2 A @ Tmb = 25 °C - Sustains peak loads in transmission control modules without forced cooling. |
| Ptot | 32 W @ Tmb = 25 °C - Supports high-power density layout on compact PCBs with direct mounting base thermal path. |
| QGD | 2.4 nC - Low gate-drain charge minimizes Miller-induced switching delay and improves EMI behavior. |
| Tj(max) | 175 °C - Qualified for under-hood operation per AEC-Q101, enabling placement near heat sources. |
| Rth(j-mb) | 4.68 K/W - Enables efficient heat transfer to heatsink or copper plane, critical for sustained 16.6 A at Tmb = 100 °C. |
Pinout & Package
Package: LFPAK56D (SOT1205), plastic surface-mount package with exposed 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 to low-side return path for first load. |
| 2 | G1 | Gate terminal of FET1 - requires logic-level drive (≥2.45 V threshold); decoupling critical for noise immunity. |
| 3 | S2 | Source terminal of FET2 - independent of S1; enables dual-load control with separate ground referencing. |
| 4 | G2 | Gate terminal of FET2 - fully independent gate control allows asynchronous or complementary switching. |
| 5, 6 | D2 | Drain terminals of FET2 - internally paralleled pins reduce inductance and improve current sharing in high-di/dt loads. |
| 7, 8 | D1 | Drain terminals of FET1 - paralleled configuration lowers effective drain inductance and enhances avalanche ruggedness. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability across temperature, humidity, and mechanical stress cycles. |
| Repetitive avalanche rating | 15 mJ single-pulse energy handling at Tj(init) = 25 °C - protects against inductive kickback in solenoid/motor drives. |
| True logic-level gate | VGS(th) > 0.5 V at 175 °C ensures turn-on compatibility with 3.3 V/5 V microcontrollers without level-shifting. |
| LFPAK56D thermal performance | 4.68 K/W junction-to-mounting-base resistance enables >16 A continuous current at 100 °C board temperature. |
| Dual independent channels | No internal connection between FET1 and FET2 - supports isolated load control, redundancy, or phase-splitting topologies. |
Applications
| Transmission Control Module | Motor Driver for HVAC Blower |
|---|---|
|
Use Scenario: High-reliability switching of electromagnetic actuators and clutch solenoids in automatic transmission control units. IC Role / Device Role / Timing Role: Dual-channel power switch - FET1 controls line pressure solenoid, FET2 controls torque converter clutch. Use Value: 175 °C junction rating and AEC-Q101 qualification ensure stable operation in engine bay ambient up to 125 °C; dual isolation prevents fault propagation between critical subsystems. |
Use Scenario: PWM-controlled DC motor driving cabin air blower in automotive HVAC systems. IC Role / Device Role / Timing Role: Half-bridge high-side switch - each FET independently manages motor phase current during commutation. Use Value: 29 mΩ RDS(on) reduces I²R losses at 15 A peak, improving system efficiency; low QGD enables clean 20 kHz PWM switching with minimal shoot-through risk. |
| 12 V Battery Disconnect Switch | LED Headlamp Dimming Circuit |
|
Use Scenario: Solid-state replacement for mechanical relays in battery management systems for start-stop functionality. IC Role / Device Role / Timing Role: Dual parallel-switched power path - both FETs conduct simultaneously to halve effective RDS(on) and thermal load. Use Value: Combined 12.5 mΩ effective on-resistance (parallel FETs) limits voltage drop to <150 mV at 12 A, preserving bus voltage integrity during cranking. |
Use Scenario: Precision current regulation for adaptive LED headlamps requiring dynamic brightness and fault-tolerant dimming. IC Role / Device Role / Timing Role: Independent channel control - FET1 handles main beam, FET2 manages low-beam or DRL current paths. Use Value: Independent gate control allows staggered PWM timing to suppress EMI; 175 °C rating accommodates sealed headlamp enclosure temperatures exceeding 105 °C. |
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) @ 10 V, 175 °C rated, but single-channel only in PowerFLAT 5x6 package. | Lacks dual-channel integration - requires two devices for same functionality, increasing PCB area and gate drive complexity. | Select when ultra-low RDS(on) is prioritized over integration and board space; verify external gate driver compatibility. |
| ON Semiconductor NTMFS5C675NL | 60 V, 3.2 mΩ RDS(on) @ 10 V, AEC-Q101 qualified, dual N-channel in SO-8FL, but higher VGS(th) (1.2–2.5 V). | Higher threshold requires ≥3.3 V logic drive; 60 V rating adds margin but increases gate charge (QG = 12.5 nC). | Prefer for 24 V hybrid systems or where higher voltage margin is needed; avoid in 3.3 V MCU-driven designs without gate boosting. |
Compared with STL220N4F7AG and NTMFS5C675NL, the BUK9K25-40E uniquely balances dual-channel integration, true 5 V logic compatibility, and proven 12 V automotive thermal resilience - making it optimal for space-constrained, MCU-driven solenoid and motor control where channel independence and AEC-Q101 compliance are non-negotiable.
Availability
BUK9K25-40E is available at Aetrix Electronics and suitable for automotive transmission control, HVAC motor drivers, battery disconnect switches, and LED headlamp dimming circuits requiring stable component supply across extended production lifecycles.
Supply support for BUK9K25-40E 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 discrete and logic devices, with leadership in automotive-qualified MOSFETs and ESD protection solutions.
The BUK9K series belongs to Nexperia's AEC-Q101-qualified logic-level automotive MOSFET portfolio, engineered specifically for thermally aggressive 12 V power switching in transmission, chassis, and body control modules.
FAQ
What is the maximum continuous drain current for BUK9K25-40E at 100 °C mounting base temperature?
The BUK9K25-40E supports 16.6 A continuous drain current at Tmb = 100 °C with VGS = 5 V, as specified in Table 1 (Quick reference data) and confirmed in Figure 1 of the datasheet. This derating reflects its 4.68 K/W thermal resistance and 175 °C maximum junction temperature limit.
Does BUK9K25-40E support gate drive from a 3.3 V microcontroller?
Yes - its VGS(th) remains >0.5 V even at Tj = 175 °C (Table 7), and RDS(on) is characterized down to VGS = 3.5 V in Figure 7. At 3.3 V, typical RDS(on) is ~45 mΩ (interpolated from Fig. 7), enabling functional but moderately lossy operation in non-critical loads.
How is avalanche ruggedness validated for this device?
BUK9K25-40E is rated for 15 mJ non-repetitive drain-source avalanche energy (EDS(AL)S) under defined conditions: ID = 18.2 A, Vsup ≤ 40 V, VGS = 10 V, Tj(init) = 25 °C (Table 5). This is tested per JEDEC standards and documented in Figure 3, with single-pulse limitation enforced by 175 °C junction temperature cap.
Are the two MOSFETs inside BUK9K25-40E electrically isolated?
Yes - Pinning information (Table 2) confirms complete electrical separation: S1/G1/D1 form one channel, S2/G2/D2 the other, with no shared terminals. The LFPAK56D package maintains isolation between die and leads, enabling independent control, fault containment, and dual-load routing without cross-talk.
BUK9K25-40E/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:
- Logic Level Gate
- Drain to Source Voltage (Vdss):
- 40V
- Current - Continuous Drain (Id) @ 25°C:
- 18.2A (Ta)
- Rds On (Max) @ Id, Vgs:
- 24mOhm @ 5A, 10V
- Vgs(th) (Max) @ Id:
- 2.1V @ 1mA
- Gate Charge (Qg) (Max) @ Vgs:
- 6.3nC @ 5V
- Input Capacitance (Ciss) (Max) @ Vds:
- 701pF @ 25V
- Power - Max:
- 32W (Ta)
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- LFPAK56D
BUK9K25-40E/1X FAQ
1.How can I place an order for BUK9K25-40E/1X through Aetrix?
Please submit a Request for Quotation (RFQ) for BUK9K25-40E/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 BUK9K25-40E/1X reliable?
The price and inventory of BUK9K25-40E/1X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9K25-40E/1X is usually 5 days.
3.What payment methods are accepted for BUK9K25-40E/1X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK9K25-40E/1X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUK9K25-40E/1X?
BUK9K25-40E/1X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUK9K25-40E/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 BUK9K25-40E/1X?
For technical support, including BUK9K25-40E/1X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9K25-40E/1X requirements.
6.How does Aetrix verify that BUK9K25-40E/1X is sourced from the original manufacturer or authorized distributors?
All BUK9K25-40E/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 BUK9K25-40E/1X meets industry standards.
7.What is the process for return or replacement of BUK9K25-40E/1X?
All BUK9K25-40E/1X units undergo pre-shipment inspection (PSI). If there is an issue with BUK9K25-40E/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 BUK9K25-40E/1X part is unused and in its original packaging.
Return procedure for BUK9K25-40E/1X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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