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Nexperia USA Inc. BUK9K25-40RAX
- Part No.:
- BUK9K25-40RAX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- FET, MOSFET Arrays
- Package:
- SOT-1205, 8-LFPAK56
- Datasheet:
-
BUK9K25-40RAX.pdf
- Description:
- MOSFET 2N-CH 40V 18.2A LFPAK56D
- Quantity:
- Payment:
- Shipping:
Inventory:7,495
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Product details
Overview
BUK9K25-40RA from Nexperia is a dual N-channel logic-level MOSFET in LFPAK56D (SOT1205) package, rated for 40 V VDS, 29 mΩ RDS(on) at VGS = 5 V and Tj = 25 °C, qualified to AEC-Q101, and engineered for repetitive avalanche operation in automotive power switching. It delivers 18.2 A continuous drain current at Tmb = 25 °C and supports 12 V/24 V/48 V engine control, transmission, and actuator loads.
For engineers reviewing the BUK9K25-40RA datasheet, BUK9K25-40RA pinout, BUK9K25-40RA application, or BUK9K25-40RA equivalent, this device is selected for high-reliability automotive power stages requiring robust unclamped inductive switching, low gate drive voltage compatibility (5 V), and validated 30 °C junction temperature rise under repetitive avalanche stress.
Technical Context
This dual MOSFET integrates two independent N-channel silicon die in a single LFPAK56D copper-clip package, enabling space-efficient half-bridge or dual-switch topologies. Its AEC-Q101 qualification covers full temperature range (−55 °C to +175 °C) and includes 1 billion-cycle repetitive avalanche validation per FET.
The device uses Application Specific FET (ASFET) silicon with optimized charge characteristics: QGD = 2.4 nC and Ciss = 528–701 pF ensure fast, controllable switching in PWM-driven inductive loads, while Rth(j-mb) = 4.68 K/W enables high-power dissipation on compact PCB mounting bases.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 40 V - Maximum blocking voltage for 12 V/24 V/48 V automotive battery rail protection and load switching |
| RDS(on) | 24–29 mΩ @ VGS = 5 V, Tj = 25 °C - Enables low conduction loss in logic-level driven circuits without level-shifting |
| ID | 18.2 A @ Tmb = 25 °C - Sustains high-current motor/valve actuation with thermal derating above mounting base temperature |
| EDS(AL)R | 19 mJ per event - Repetitive avalanche energy rating validated for ≥1 billion cycles at ≤30 °C Tj rise |
| QGD | 2.4 nC - Low gate-drain charge minimizes Miller-induced shoot-through risk in bridge configurations |
| Rth(j-mb) | 4.68 K/W - Enables efficient heat transfer to PCB copper pour or heatsink, supporting >30 W dissipation in optimized layouts |
| VGS(th) | 1.4–2.1 V @ Tj = 25 °C - Ensures reliable turn-on with standard 3.3 V or 5 V microcontroller GPIOs |
Pinout & Package
LFPAK56D (SOT1205) is a dual-side copper-clip surface-mount package with gull-wing leads, offering high thermal conductivity (Rth(j-mb) = 4.68 K/W), AOI-compatible solder joints, and mechanical robustness for automotive vibration environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | S1 | Source terminal of FET1 - Connected to low-side return path; electrically isolated from S2 |
| 2 | G1 | Gate terminal of FET1 - Requires <2.1 V threshold for turn-on; decoupling critical for EMI control |
| 3 | S2 | Source terminal of FET2 - Independent return node; enables dual-load or half-bridge source referencing |
| 4 | G2 | Gate terminal of FET2 - Fully independent control; no internal gate coupling between FET1 and FET2 |
| 5, 6 | D2 | Drain terminal of FET2 - Internally paralleled pins (5 & 6) reduce bond-wire inductance and improve current sharing |
| 7, 8 | D1 | Drain terminal of FET1 - Internally paralleled pins (7 & 8) enhance pulsed current capability and thermal spreading |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified at 175 °C | Validated for automotive under-hood operation with full temperature cycling, HTOL, and HAST compliance |
| Repetitive avalanche rated | Tested to 1 billion unclamped inductive switching events at 30 °C Tj rise - eliminates need for external snubbers in solenoid/relay drivers |
| LFPAK56D copper-clip construction | Reduces package resistance by 30 % vs. standard SO8; improves RDS(on) stability and power density |
| Gull-wing lead form | Enables automated optical inspection (AOI) and high-yield reflow soldering on production lines |
| Logic-level gate drive | VGS(th) max = 2.45 V ensures full enhancement with 3.3 V MCU outputs - no gate driver IC required |
Applications
| Engine Control Unit (ECU) | Transmission Control Module (TCM) |
|---|---|
|
Use Scenario: Driving fuel injectors and ignition coils in gasoline/diesel ECUs with rapid PWM switching and inductive kickback. IC Role / Device Role / Timing Role: Dual high-side/low-side switch managing coil energization and controlled discharge via repetitive avalanche. Use Value: Eliminates external TVS/clamp diodes by sustaining 19 mJ per avalanche event across >1 billion cycles - reduces BOM count and board area. |
Use Scenario: Controlling hydraulic solenoids and shift actuators in automatic transmissions with 12 V/24 V supply rails. IC Role / Device Role / Timing Role: Dual-channel load switch providing independent enable/disable for pressure control valves and clutch engagement. Use Value: 29 mΩ RDS(on) at 5 V gate drive minimizes I²R heating during sustained 10–15 A duty cycles - extends solenoid lifetime and system reliability. |
| Electric Power Steering (EPS) | Body Control Module (BCM) |
|
Use Scenario: Managing motor phase current in brushless EPS assist systems using half-bridge configurations. IC Role / Device Role / Timing Role: Dual N-channel FET used as low-side switches in three-phase inverter legs, synchronized with gate drivers. Use Value: QGD = 2.4 nC and fast tr/tf (9.2 ns / 8.9 ns) enable clean commutation at >20 kHz PWM - reduces audible noise and torque ripple. |
Use Scenario: Switching auxiliary loads including HVAC blowers, seat heaters, and lighting modules in 48 V mild-hybrid BCMs. IC Role / Device Role / Timing Role: Dual independent load switch handling separate 48 V circuits with integrated overtemperature protection. Use Value: Junction temperature limit of 175 °C and Rth(j-mb) = 4.68 K/W allow stable 16.6 A operation at Tmb = 100 °C - supports high ambient under-dash environments. |
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 |
|---|---|---|---|
| Infineon BSC020N04LS6 | Single-channel 40 V, 2.0 mΩ RDS(on); TO-263 package; no repetitive avalanche rating | Requires external clamping for inductive loads; not AEC-Q101 qualified for repetitive avalanche | Select only when ultra-low RDS(on) is prioritized over avalanche ruggedness and dual-channel integration |
| ON Semiconductor NTMFS5C428NT1G | Dual-channel 40 V, 3.1 mΩ RDS(on); SO-8 package; AEC-Q101 qualified but limited to 100 k-cycle avalanche | Limited cycle life in high-frequency solenoid drivers; higher Rth(j-a) (95 K/W) reduces power handling | Prefer for cost-sensitive 12 V BCM loads where avalanche stress is infrequent and thermal margin is ample |
Compared with BSC020N04LS6 and NTMFS5C428NT1G, the BUK9K25-40RA uniquely combines dual-channel integration, 1-billion-cycle repetitive avalanche validation, and LFPAK56D's 4.68 K/W thermal resistance - making it the only option qualified for high-duty-cycle automotive inductive switching without external protection.
Availability
BUK9K25-40RA is available at Aetrix Electronics and suitable for automotive engine control, transmission actuation, and electric power steering systems requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant traceability.
Supply support for BUK9K25-40RA 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 advanced packaging technologies.
The BUK9K25-40RA belongs to Nexperia's ASFET (Application Specific FET) product line, designed specifically for automotive power switching applications demanding repetitive avalanche endurance, logic-level drive, and compact dual-channel integration.
FAQ
What is the maximum continuous drain current for BUK9K25-40RA at 100 °C mounting base temperature?
The BUK9K25-40RA supports 16.6 A continuous drain current at Tmb = 100 °C, as specified in Table 5 (Limiting Values) and confirmed in Figure 2 of the datasheet. This value reflects thermal derating from the 18.2 A rating at 25 °C mounting base temperature due to reduced heat dissipation capacity.
Does BUK9K25-40RA require external gate resistors for avalanche operation?
No external gate resistor is required solely for repetitive avalanche operation, as the device is characterized with RGS = 10 Ω in its avalanche test conditions (Figure 4–6). However, a 5–10 Ω series gate resistor is recommended to dampen ringing and control dV/dt during hard-switching in bridge configurations.
How does RDS(on) change after repeated avalanche events?
Per Figure 6, RDS(on) increases by up to 50 % after 100 million avalanche cycles at VGS = 5 V. The datasheet specifies that RDS(on) degradation remains within specification limits for the full 1 billion-event rating, with typical increase ≤20 % at end-of-life under defined test conditions.
Can BUK9K25-40RA be used in a synchronous rectifier configuration?
Yes - its low 29 mΩ RDS(on) and fast 15.9 ns reverse recovery time (trr) support synchronous rectification in DC-DC converters up to 48 V input. However, body diode conduction must be minimized via precise gate timing, as the integrated source-drain diode has VSD = 0.83–1.2 V at 5 A and is not optimized for high-frequency freewheeling.
BUK9K25-40RAX 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:
- 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
BUK9K25-40RAX FAQ
1.How can I place an order for BUK9K25-40RAX through Aetrix?
Please submit a Request for Quotation (RFQ) for BUK9K25-40RAX 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 BUK9K25-40RAX reliable?
The price and inventory of BUK9K25-40RAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9K25-40RAX is usually 5 days.
3.What payment methods are accepted for BUK9K25-40RAX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK9K25-40RAX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUK9K25-40RAX?
BUK9K25-40RAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUK9K25-40RAX 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 BUK9K25-40RAX?
For technical support, including BUK9K25-40RAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9K25-40RAX requirements.
6.How does Aetrix verify that BUK9K25-40RAX is sourced from the original manufacturer or authorized distributors?
All BUK9K25-40RAX 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 BUK9K25-40RAX meets industry standards.
7.What is the process for return or replacement of BUK9K25-40RAX?
All BUK9K25-40RAX units undergo pre-shipment inspection (PSI). If there is an issue with BUK9K25-40RAX, 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 BUK9K25-40RAX part is unused and in its original packaging.
Return procedure for BUK9K25-40RAX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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