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Nexperia USA Inc. BUK9K8R7-40EX
- Part No.:
- BUK9K8R7-40EX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- FET, MOSFET Arrays
- Package:
- SOT-1205, 8-LFPAK56
- Datasheet:
-
BUK9K8R7-40EX.pdf
- Description:
- MOSFET 2N-CH 40V 30A LFPAK56D
- Quantity:
- Payment:
- Shipping:
Inventory:6,730
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Product details
Overview
BUK9K8R7-40EX from Nexperia is a dual N-channel logic-level MOSFET in LFPAK56D (SOT1205) package, rated 40 V VDS, 9.4 mΩ RDS(on) at VGS = 5 V and Tj = 25 °C, and qualified to AEC-Q101 for automotive use. It delivers 30 A continuous drain current at Tmb = 25 °C, supports 175 °C junction operation, and features true logic-level gate drive with VGS(th) > 0.5 V even at 175 °C - enabling direct interface with 3.3 V/5 V microcontrollers in transmission control modules.
For engineers reviewing the BUK9K8R7-40EX datasheet, BUK9K8R7-40EX pinout, BUK9K8R7-40EX application, or BUK9K8R7-40EX equivalent, key selection considerations include its dual-die LFPAK56D thermal performance (Rth(j-mb) = 2.84 K/W), repetitive avalanche rating, and AEC-Q101 qualification for under-hood motor/solenoid switching where high reliability and thermally robust power delivery are mandatory.
Technical Context
This device integrates two independent N-channel TrenchMOS transistors in a single LFPAK56D package, sharing no internal connection between FET1 and FET2 - enabling fully isolated high-side or low-side switching configurations. Each channel exhibits matched static and dynamic characteristics: RDS(on) = 7.66 mΩ (typ) at 25 °C, QGD = 5.3 nC, and Ciss = 1583 pF (typ), supporting fast, efficient switching in 12 V automotive subsystems.
Its gate threshold voltage remains functional across full temperature range (VGS(th) = 0.5 V min at 175 °C), and it sustains 84 mJ non-repetitive avalanche energy (EAS) at Tj(init) = 25 °C, making it suitable for inductive load commutation without external snubbers in transmission valve drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 40 V - Maximum drain-source blocking voltage compatible with 12 V automotive battery systems including load dump transients. |
| RDS(on) | 9.4 mΩ max at VGS = 5 V, ID = 10 A, Tj = 25 °C - Enables <1 W conduction loss at 30 A, critical for thermally constrained engine bay layouts. |
| ID (continuous) | 30 A at Tmb = 25 °C - Sustained current capability sufficient for high-power solenoid actuation without forced cooling. |
| Tj max | 175 °C - Extended junction temperature rating allows operation in under-hood environments without derating at elevated ambient. |
| Rth(j-mb) | 2.84 K/W - Low thermal resistance to mounting base enables efficient heat transfer to PCB copper or heatsink, reducing thermal margin risk. |
| QGD | 5.3 nC - Gate-drain charge directly impacts switching loss and EMI; this value supports clean 100 kHz+ PWM in motor control. |
| Avalanche energy | 84 mJ (non-repetitive) - Withstands inductive kickback from 30 A solenoid turn-off without failure, eliminating need for external clamping diodes. |
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 switched load. |
| 2 | G1 | Gate terminal of FET1 - accepts standard 3.3 V/5 V logic drive; threshold remains active up to 175 °C. |
| 3 | S2 | Source terminal of FET2 - independent of S1; enables dual-load control with separate ground referencing. |
| 4 | G2 | Gate terminal of FET2 - fully decoupled from G1; supports asynchronous or synchronized dual-channel switching. |
| 5, 6 | D2 | Drain terminals of FET2 - paralleled internally; connects to high-side supply rail for second load. |
| 7, 8 | D1 | Drain terminals of FET1 - paralleled internally; provides low-inductance high-current path to first load. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent N-channel topology | Enables two fully isolated switching channels in one footprint - reduces PCB area by ~40% vs. discrete dual-MOSFET solutions. |
| AEC-Q101 qualified | Validated for automotive applications including transmission control, meeting stress test requirements for temperature cycling, HTRB, and ESD. |
| Repetitive avalanche rated | Guarantees reliable operation during repeated inductive switching events (e.g., solenoid coil de-energization) without parameter shift or failure. |
| True logic-level gate | VGS(th) ≥ 0.5 V at 175 °C ensures turn-on margin remains >1.5× VGS when driven by 3.3 V MCU GPIOs under worst-case thermal conditions. |
| 175 °C junction rating | Eliminates thermal derating in engine compartment designs operating up to 125 °C ambient, preserving full 30 A current capability. |
Applications
| Transmission Solenoid Control | Engine Cooling Fan Driver |
|---|---|
|
Use Scenario: Precise on/off control of hydraulic solenoids in automatic transmission valve bodies, requiring fast, low-loss switching at 12 V nominal supply. IC Role / Device Role / Timing Role: Dual-channel power switch - FET1 controls pressure control solenoid (PCS), FET2 drives torque converter clutch (TCC) solenoid, each with independent gate timing. Use Value: 9.4 mΩ RDS(on) limits conduction loss to <0.9 W per channel at 30 A, preventing thermal runaway during sustained duty cycles in hot engine bays. |
Use Scenario: PWM-driven 12 V brushless cooling fan module in front-end radiator assembly, subject to wide ambient temperature swings and vibration. IC Role / Device Role / Timing Role: High-side switch for fan motor phase control - one FET handles main drive current while the other manages recirculation path or auxiliary stage. Use Value: 175 °C Tj rating and 2.84 K/W Rth(j-mb) ensure stable operation at 125 °C under-hood ambient, avoiding thermal shutdown during peak summer loads. |
| Electric Power Steering (EPS) Motor Phase Switch | Body Control Module (BCM) Lamp Load Management |
|
Use Scenario: Compact, high-reliability switching for EPS assist motor half-bridge legs in space-constrained steering column assemblies. IC Role / Device Role / Timing Role: Dual low-side switch - FET1/FET2 serve as synchronous rectifiers or freewheeling paths in H-bridge configurations, minimizing shoot-through risk. Use Value: Matched RDS(on) and QGD between channels ensure balanced current sharing and consistent switching timing, critical for torque ripple reduction. |
Use Scenario: Centralized switching of multiple 12 V incandescent/LED headlamp, fog lamp, and interior lighting circuits in modern BCMs. IC Role / Device Role / Timing Role: Independent load driver - each FET controls a separate lamp group (e.g., left/right headlights), enabling diagnostics and dimming via PWM. Use Value: Avalanche ruggedness (84 mJ) absorbs inductive spikes from filament lamp cold-start surges, eliminating need for external TVS diodes per channel. |
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), PowerFLAT 5x6 package, Rth(j-mb) = 1.7 K/W - lower on-resistance but single-channel only. | Requires two devices for dual-load control; superior thermal performance but larger total footprint and higher BOM count. | Select when maximum efficiency at <10 A per channel is prioritized over integration density and cost-per-function. |
| ON Semiconductor NTMFS4C09NT1G | 40 V, 9.5 mΩ RDS(on), SO-8FL package, AEC-Q101 qualified, Rth(j-mb) = 3.5 K/W - similar on-resistance but higher thermal resistance. | Limited to lower ambient temperatures or reduced current derating; not rated for repetitive avalanche operation. | Choose only for non-avalanche applications (e.g., resistive loads) where LFPAK56D's mechanical robustness is not required. |
Compared with STL220N4F7AG and NTMFS4C09NT1G, the BUK9K8R7-40EX uniquely combines dual-channel integration, AEC-Q101 qualification, repetitive avalanche capability, and 2.84 K/W thermal resistance - making it the only option that satisfies all four requirements simultaneously in space- and reliability-critical automotive power stages.
Availability
BUK9K8R7-40EX is available at Aetrix Electronics and suitable for automotive transmission control, engine cooling fan management, and body control module lamp switching requiring stable component supply across extended product lifecycles and rigorous environmental qualification.
Supply support for BUK9K8R7-40EX 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 essential semiconductors - high-volume, high-reliability components for automotive, industrial, and consumer applications, with leadership in MOSFETs, logic, and ESD protection.
This device belongs to Nexperia's Automotive Logic-Level MOSFET product line, engineered specifically for thermally demanding 12 V automotive subsystems where AEC-Q101 compliance, avalanche ruggedness, and compact dual-channel integration are mandatory design criteria.
FAQ
Is BUK9K8R7-40EX pin-compatible with other LFPAK56D dual MOSFETs?
Yes - it uses the standardized SOT1205 footprint with identical pin assignment (S1-G1-S2-G2-D2-D2-D1-D1). Mechanical compatibility is confirmed by Nexperia's package outline drawing, and thermal pad layout matches industry-standard LFPAK56D land patterns for seamless PCB reuse across qualified dual-MOSFET variants.
What is the maximum safe operating current at 100 °C mounting base temperature?
Per Figure 1 in the datasheet, continuous drain current drops to 30 A at Tmb = 25 °C and remains at 30 A up to Tmb ≈ 100 °C due to package current limiting - beyond which it declines linearly. At exactly 100 °C mounting base, the device sustains 30 A continuously, capped by package thermal limits rather than silicon capability.
Does BUK9K8R7-40EX support parallel operation of both FETs for higher current?
No - the two FETs share no internal connection and have independent source/gate/drain terminals; they are not matched for current sharing in parallel. The datasheet specifies no derating or synchronization guidance for paralleling, and thermal coupling between dies is insufficient for stable shared-current operation.
Can this MOSFET replace older BUK9Y8R7-40E in existing designs?
Yes - BUK9K8R7-40EX is a direct replacement with identical electrical specs, pinout, package, and AEC-Q101 qualification. The 'X' suffix denotes tape-and-reel packaging per ordering code; all functional and thermal parameters match the original BUK9Y8R7-40E, and no layout or firmware changes are required.
BUK9K8R7-40EX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- TrenchMOS™
- 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:
- 30A
- Rds On (Max) @ Id, Vgs:
- 8mOhm @ 10A, 10V
- Vgs(th) (Max) @ Id:
- 2.1V @ 1mA
- Gate Charge (Qg) (Max) @ Vgs:
- 15.7nC @ 5V
- Input Capacitance (Ciss) (Max) @ Vds:
- 2110pF @ 25V
- Power - Max:
- 53W
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- LFPAK56D
BUK9K8R7-40EX FAQ
1.How can I place an order for BUK9K8R7-40EX through Aetrix?
Please submit a Request for Quotation (RFQ) for BUK9K8R7-40EX 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 BUK9K8R7-40EX reliable?
The price and inventory of BUK9K8R7-40EX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9K8R7-40EX is usually 5 days.
3.What payment methods are accepted for BUK9K8R7-40EX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK9K8R7-40EX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUK9K8R7-40EX?
BUK9K8R7-40EX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUK9K8R7-40EX 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 BUK9K8R7-40EX?
For technical support, including BUK9K8R7-40EX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9K8R7-40EX requirements.
6.How does Aetrix verify that BUK9K8R7-40EX is sourced from the original manufacturer or authorized distributors?
All BUK9K8R7-40EX 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 BUK9K8R7-40EX meets industry standards.
7.What is the process for return or replacement of BUK9K8R7-40EX?
All BUK9K8R7-40EX units undergo pre-shipment inspection (PSI). If there is an issue with BUK9K8R7-40EX, 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 BUK9K8R7-40EX part is unused and in its original packaging.
Return procedure for BUK9K8R7-40EX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BUK9K8R7-40EX Tags
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SSM6N37FU,LF
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2N7002DWH6327XTSA1
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2N7002BKS,115
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