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Nexperia USA Inc. BUK9M8R5-40HX
- Part No.:
- BUK9M8R5-40HX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- FETs, MOSFETs
- Package:
- SOT-1210, 8-LFPAK33 (5-Lead)
- Datasheet:
-
BUK9M8R5-40HX.pdf
- Description:
- MOSFET N-CH 40V 40A LFPAK33
- Quantity:
- Payment:
- Shipping:
Inventory:16,488
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Product details
Overview
BUK9M8R5-40HX from Nexperia is an AEC-Q101 qualified N-channel logic-level MOSFET in LFPAK33 (SOT1210) package, rated for 40 V VDS, 8.5 mΩ RDS(on) at VGS = 10 V and Tj = 25 °C, and 40 A continuous drain current at Tmb = 25 °C. It delivers high power density and robust avalanche performance for automotive body electronics and DC-DC converters.
For engineers reviewing the BUK9M8R5-40HX datasheet, BUK9M8R5-40HX pinout, BUK9M8R5-40HX application, or BUK9M8R5-40HX equivalent, key selection criteria include its 2.33 K/W junction-to-mounting-base thermal resistance, repetitive avalanche rating, gull-wing lead manufacturability, and 4.5 V logic-level gate drive compatibility with 12 V automotive systems.
Technical Context
This MOSFET employs Trench 9 superjunction technology to achieve low conduction losses and high power density in a compact LFPAK33 footprint. Its copper clip construction enhances thermal transfer and mechanical robustness while enabling high-current capability without bond wire limitations.
The device features a fully characterized source-drain diode with soft reverse recovery (S = 0.61), 15 nC recovered charge, and 22 ns trr - optimized for synchronous rectification and flyback topologies in automotive DC-DC and motor control. Gate threshold voltage ranges from 0.7 V (Tj = 175 °C) to 2.15 V (Tj = 25 °C), ensuring reliable turn-on across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 40 V maximum drain-source voltage - supports 12 V automotive rail with margin against load dump transients. |
| RDS(on) | 8.5 mΩ at VGS = 10 V, ID = 15 A, Tj = 25 °C - enables <1 W conduction loss at 40 A, critical for thermally constrained modules. |
| ID (cont) | 40 A at Tmb = 25 °C - validated in application tests; real-world current limited by PCB copper and heatsinking. |
| EAS | 24 mJ non-repetitive avalanche energy - provides single-pulse ruggedness during inductive switching faults. |
| Rth(j-mb) | 2.33 K/W typical junction-to-mounting-base thermal resistance - allows direct thermal coupling to heatsink or copper plane for efficient power dissipation. |
| QGD | 2.1–4.2 nC gate-drain charge at VGS = 4.5 V - determines switching speed and Miller-induced shoot-through risk in half-bridge configurations. |
| VGS(th) | 0.7–2.15 V range over -55 to 175 °C - ensures gate drive compatibility with standard 3.3 V/5 V microcontrollers and automotive logic interfaces. |
Pinout & Package
LFPAK33 (SOT1210) is a surface-mount, copper-clip package with gull-wing leads and an exposed mounting base electrically connected to the drain. Its 3.2 mm × 2.4 mm footprint and 0.65 mm pitch support high-density automotive PCB layouts and automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | Source (S) | Three parallel source terminals reduce source inductance and improve current sharing in high-frequency switching. |
| 4 | Gate (G) | Single gate input with 0.3–2 Ω internal gate resistance - simplifies external gate driver design and damping requirements. |
| Mounting Base (mb) | Drain (D) | Exposed copper pad tied directly to drain - serves as primary thermal path and high-current drain connection; requires soldered thermal pad on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification at 175 °C | Validated for under-hood automotive use including engine control, chassis, and infotainment modules. |
| Trench 9 superjunction architecture | Enables 8.5 mΩ RDS(on) in LFPAK33 - 30% lower on-resistance than comparable TrenchMOS devices in same package. |
| Repetitive avalanche rated | Withstands repeated inductive energy spikes up to 24 mJ per pulse - eliminates need for external snubbers in solenoid drivers. |
| Gull-wing leads + copper clip | Supports AOI inspection and high-yield reflow soldering while delivering 2× higher current capability vs. standard SO8. |
| Soft-recovery source-drain diode | S = 0.61 reduces EMI and voltage overshoot during freewheeling in buck and half-bridge topologies. |
Applications
| Automotive Body Control Module (BCM) | 12 V DC-DC Converter Primary Switch |
|---|---|
Use Scenario: High-side load switching for interior lighting, window lifters, and door locks in modern BCMs. IC Role / Device Role / Timing Role: Power switch controlling 12 V loads with PWM dimming and short-circuit protection. Use Value: Low RDS(on) minimizes heat generation in sealed modules; gull-wing leads ensure reliable reflow in multi-layer automotive PCBs. |
Use Scenario: Synchronous rectifier or high-side switch in 12 V → 5 V/3.3 V buck converters for ADAS sensors and infotainment head units. IC Role / Device Role / Timing Role: Main switching element operating at 200–500 kHz with fast turn-on/off times (td(on) = 9.5 ns, tf = 5.6 ns). Use Value: Low QGD and Coss (483 pF max) reduce switching losses; soft diode enables zero-voltage switching in synchronous designs. |
| Electric Power Steering (EPS) Motor Driver | LED Headlamp Dimming Circuit |
Use Scenario: Half-bridge leg in 12 V EPS motor phase control, handling bidirectional current up to 40 A peak. IC Role / Device Role / Timing Role: Low-side or high-side MOSFET in three-phase inverter driving brushed or BLDC assist motors. Use Value: Repetitive avalanche rating protects against back-EMF spikes; 175 °C junction rating sustains operation near motor housing. |
Use Scenario: PWM-controlled current sink for adaptive LED headlamps requiring precise brightness regulation and thermal foldback. IC Role / Device Role / Timing Role: Constant-current switch modulating LED string current at >1 kHz to eliminate visible flicker. Use Value: 4.5 V logic-level gate drive ensures full enhancement from MCU GPIO; low RDS(on) maintains efficiency at 2–5 A forward current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-channel automotive MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STL220N4F7AG | 40 V, 2.2 mΩ RDS(on) in PowerFLAT 5x6; higher current rating but larger footprint and no AEC-Q101 grade. | Targeted at industrial motor drives; lacks automotive qualification and soft diode characterization. | Select when ultra-low RDS(on) outweighs qualification needs and board space permits larger package. |
| ON Semiconductor NTMFS4C09NT1G | 40 V, 9.5 mΩ RDS(on) in SO-8FL; AEC-Q101 qualified but uses bond-wire construction and lacks repetitive avalanche rating. | Suitable for less demanding automotive loads where avalanche stress is mitigated externally. | Choose for cost-sensitive, lower-power applications where thermal performance and ruggedness are secondary to procurement availability. |
Compared with STL220N4F7AG and NTMFS4C09NT1G, BUK9M8R5-40HX uniquely combines AEC-Q101 qualification, repetitive avalanche capability, and LFPAK33's superior thermal resistance - making it optimal for thermally constrained, safety-critical automotive switches where reliability under fault conditions is mandatory.
Availability
BUK9M8R5-40HX is available at Aetrix Electronics and suitable for automotive body electronics, DC-DC converter primary switching, and medium-power motor drive applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for BUK9M8R5-40HX 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 efficiency technologies, delivering high-performance logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.
BUK9M8R5-40HX belongs to Nexperia's Automotive Logic Level MOSFET product line, engineered specifically for 12 V automotive systems requiring AEC-Q101 compliance, high thermal robustness, and high-current switching in minimal PCB area.
FAQ
What is the maximum continuous drain current for BUK9M8R5-40HX at 100 °C mounting base temperature?
At Tmb = 100 °C, the continuous drain current is 40 A (per Figure 2 in the datasheet). This value is validated in application testing but assumes adequate PCB copper area and thermal interface to maintain mounting base temperature - actual current must be derated based on system-level thermal design and ambient conditions.
Does BUK9M8R5-40HX support 3.3 V logic-level gate drive?
No - BUK9M8R5-40HX is a logic-level MOSFET optimized for 4.5 V minimum gate drive. At VGS = 3.3 V, RDS(on) rises significantly (typ. 11.5 mΩ at Tj = 25 °C), increasing conduction loss. For 3.3 V systems, a gate driver or level shifter is required to ensure full enhancement and specified performance.
How is the mounting base (drain) electrically isolated during PCB layout?
The mounting base is internally connected to the drain and must be soldered to a dedicated PCB copper pour. Electrical isolation is achieved by maintaining clearance and creepage distances per IPC-2221 between this drain pad and adjacent signal/power planes. No dielectric layer is integrated - external insulation (e.g., solder mask, prepreg) is required if isolation from chassis ground is needed.
Is BUK9M8R5-40HX suitable for linear mode (saturation region) operation?
No - this device is designed for switching operation only. Its Safe Operating Area (SOA) curve (Figure 3) shows limited linear-mode capability: at VDS = 10 V, maximum continuous current drops to ~10 A due to thermal constraints. Linear operation risks thermal runaway and is not characterized or guaranteed per datasheet specifications.
BUK9M8R5-40HX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SOT-1210, 8-LFPAK33 (5-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 40 V
- Current - Continuous Drain (Id) @ 25°C:
- 40A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 4.5V, 10V
- Rds On (Max) @ Id, Vgs:
- 8.5mOhm @ 15A, 10V
- Vgs(th) (Max) @ Id:
- 2.15V @ 1mA
- Gate Charge (Qg) (Max) @ Vgs:
- 28 nC @ 10 V
- Vgs (Max):
- ±16V
- Input Capacitance (Ciss) (Max) @ Vds:
- 1800 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 59W (Tc)
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- LFPAK33
BUK9M8R5-40HX FAQ
1.How can I place an order for BUK9M8R5-40HX through Aetrix?
Please submit a Request for Quotation (RFQ) for BUK9M8R5-40HX 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 BUK9M8R5-40HX reliable?
The price and inventory of BUK9M8R5-40HX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9M8R5-40HX is usually 5 days.
3.What payment methods are accepted for BUK9M8R5-40HX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK9M8R5-40HX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUK9M8R5-40HX?
BUK9M8R5-40HX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUK9M8R5-40HX 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 BUK9M8R5-40HX?
For technical support, including BUK9M8R5-40HX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9M8R5-40HX requirements.
6.How does Aetrix verify that BUK9M8R5-40HX is sourced from the original manufacturer or authorized distributors?
All BUK9M8R5-40HX 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 BUK9M8R5-40HX meets industry standards.
7.What is the process for return or replacement of BUK9M8R5-40HX?
All BUK9M8R5-40HX units undergo pre-shipment inspection (PSI). If there is an issue with BUK9M8R5-40HX, 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 BUK9M8R5-40HX part is unused and in its original packaging.
Return procedure for BUK9M8R5-40HX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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