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Nexperia USA Inc. BUK7M45-40EX
- Part No.:
- BUK7M45-40EX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- FETs, MOSFETs
- Package:
- SOT-1210, 8-LFPAK33 (5-Lead)
- Datasheet:
-
BUK7M45-40EX.pdf
- Description:
- MOSFET N-CH 40V 19A LFPAK33
- Quantity:
- Payment:
- Shipping:
Inventory:1,290
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Product details
Overview
BUK7M45-40EX from Nexperia is an AEC-Q101-qualified N-channel standard-level MOSFET in LFPAK33 (SOT1210) package, rated for 40 V VDS, 45 mΩ RDS(on) at 10 V VGS and 25 °C, with 175 °C maximum junction temperature and repetitive avalanche capability - deployed in automotive transmission control and 12 V load switching circuits.
For engineers reviewing the BUK7M45-40EX datasheet, BUK7M45-40EX pinout, BUK7M45-40EX application, or BUK7M45-40EX equivalent, this device supports thermally demanding automotive power switching where gate drive simplicity (standard-level VGS(th) > 1 V at 175 °C), robustness under unclamped inductive switching, and high-current pulsed operation (77 A peak) are critical selection criteria.
Technical Context
This MOSFET uses TrenchMOS technology to achieve low on-resistance and fast switching performance in a compact LFPAK33 package. Its true standard-level gate enables direct drive from 5 V or 3.3 V microcontrollers without level-shifting, while its 175 °C thermal rating and Q101 qualification ensure reliability in engine bay and transmission control modules.
The device integrates a source-drain diode with 10.6 ns reverse recovery time and 4.7 nC recovered charge, supporting synchronous rectification and flyback energy management. Its 4.27 K/W junction-to-mounting-base thermal resistance enables high-power dissipation (31 W at Tmb = 25 °C) when mounted on copper pads or heatsinks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 40 V - Maximum drain-source blocking voltage compatible with 12 V automotive systems including load dump transients. |
| RDS(on) | 33–45 mΩ @ VGS = 10 V, ID = 5 A, Tj = 25 °C - Enables low conduction loss in high-current motor/solenoid drivers. |
| ID (continuous) | 19 A @ Tmb = 25 °C - Supports sustained current delivery in battery-fed loads without external heatsinking. |
| EAS | 4.6 mJ - Non-repetitive avalanche energy rating ensures ruggedness against inductive kickback in solenoid and motor control. |
| QGD | 2.2 nC - Low gate-drain charge minimizes Miller-induced switching delay and improves turn-off immunity in high-dV/dt environments. |
| Tj(max) | 175 °C - Junction temperature rating aligned with under-hood automotive thermal requirements per AEC-Q101. |
| VGS(th) | > 1 V @ Tj = 175 °C - Confirmed standard-level threshold ensures reliable turn-on with 5 V logic even at extreme temperatures. |
Pinout & Package
LFPAK33 (SOT1210) is a surface-mount, single-ended power package with exposed mounting base connected to drain, optimized for low-inductance, high-current PCB layouts and thermal transfer to copper planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | Source (S) | Three parallel source terminals reduce bond wire inductance and improve current sharing in high-frequency PWM applications. |
| 4 | Gate (G) | Single gate input with 6.2 nC total gate charge - compatible with standard logic-level drivers and microcontroller GPIOs. |
| Mounting Base | Drain (D) | Exposed copper pad electrically connected to drain - serves as primary thermal path and high-current return node. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use across temperature, humidity, vibration, and lifetime stress tests per JESD47/22. |
| Repetitive avalanche rated | Capable of repeated unclamped inductive switching events without degradation - critical for transmission solenoid drivers. |
| 175 °C junction rating | Enables operation in engine compartment locations where ambient temperatures exceed 125 °C. |
| Standard-level gate drive | VGS(th) > 1 V at 175 °C ensures turn-on margin with 5 V MCU outputs even under worst-case thermal conditions. |
| Low RDS(on) × QG figure-of-merit | ~280 mΩ·nC - balances conduction and switching losses for high-efficiency 10–100 kHz PWM control. |
Applications
| Transmission Solenoid Control | Motor Load Switching |
|---|---|
|
Use Scenario: Precise on/off timing of hydraulic solenoids in automatic transmission valve bodies. IC Role / Device Role / Timing Role: High-side or low-side power switch controlling 12 V, 2–5 A solenoid coils with <10 µs response. Use Value: Repetitive avalanche rating absorbs back-EMF during rapid de-energization, eliminating need for external flyback diodes. |
Use Scenario: PWM-driven DC brush motor in HVAC blower or power seat actuator. IC Role / Device Role / Timing Role: Low-side switching element operating at 20 kHz with 19 A continuous current capability. Use Value: 33 mΩ RDS(on) limits I²R loss to <2 W at 8 A, reducing thermal design burden in space-constrained modules. |
| Lamp Dimming & Protection | Engine Bay Power Distribution |
|
Use Scenario: LED headlamp or fog lamp current regulation with overcurrent and thermal foldback. IC Role / Device Role / Timing Role: Constant-current switch with integrated thermal shutdown via mounting base sensing. Use Value: 175 °C Tj(max) and 4.27 K/W Rth(j-mb) enable stable dimming operation near hot engine surfaces. |
Use Scenario: Centralized 12 V power distribution unit managing multiple ECU sub-circuits. IC Role / Device Role / Timing Role: Protected high-current branch switch with fast fault detection and current limiting. Use Value: 77 A pulsed current rating supports short-duration cranking surges without latch-up or thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-channel automotive power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STL220N4F7AG | 40 V, 2.2 mΩ RDS(on), 220 A ID, PowerFLAT 5x6 package, logic-level gate (VGS(th) = 2.5 V typ) | Higher current capacity and lower RDS(on), but larger footprint and higher gate charge (35 nC) | Select when system requires >50 A peak current and can accommodate larger thermal pad area and stronger gate driver. |
| ON Semiconductor NTMFS4C09NT1G | 40 V, 4.0 mΩ RDS(on), 100 A ID, SO-8FL package, standard-level gate (VGS(th) = 2.5 V min) | Lower RDS(on) and higher current, but SO-8FL has higher Rth(j-mb) (5.5 K/W) and no avalanche rating | Choose for cost-sensitive non-automotive industrial loads where avalanche ruggedness is not required and thermal margin exists. |
Compared with STL220N4F7AG and NTMFS4C09NT1G, BUK7M45-40EX offers optimal balance of automotive qualification, standard-level gate compatibility, avalanche robustness, and compact LFPAK33 footprint - making it preferred for space-constrained, thermally aggressive 12 V solenoid and motor control nodes.
Availability
BUK7M45-40EX is available at Aetrix Electronics and suitable for automotive transmission control, 12 V motor actuation, and engine bay power distribution requiring stable component supply across extended product lifecycles.
Supply support for BUK7M45-40EX 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 discrete, logic, and MOSFET solutions - spun off from Philips and now part of Wingtech Technology.
This device belongs to Nexperia's AEC-Q101-qualified LFPAK automotive MOSFET portfolio, engineered specifically for robust, thermally efficient power switching in 12 V and 48 V vehicle subsystems.
FAQ
Is BUK7M45-40EX pin-compatible with other LFPAK33 MOSFETs?
Yes - all LFPAK33 (SOT1210) devices share identical mechanical footprint and terminal layout: pins 1–3 are source, pin 4 is gate, and the mounting base is drain. This enables drop-in replacement within the same package family, provided electrical parameters meet design requirements.
What is the maximum recommended PCB copper area for thermal performance?
For optimal thermal performance, Nexperia recommends ≥ 100 mm² of 2 oz copper connected directly to the mounting base. With this layout, the device achieves full 19 A continuous current rating at Tmb = 25 °C and maintains safe operation up to Tmb = 100 °C at 13 A.
Does BUK7M45-40EX require a gate resistor for automotive EMI compliance?
A 5 Ω external gate resistor is specified in the datasheet for switching characterization (Fig. 3, Fig. 13). This value balances EMI suppression and switching speed - reducing dV/dt without excessive turn-on delay - and is validated for CISPR 25 Class 5 emission limits in typical automotive harness configurations.
Can BUK7M45-40EX be used in high-side switching configurations?
Yes - its standard-level gate allows direct drive from 5 V sources, and its 40 V VDS rating supports high-side placement in 12 V systems. However, a dedicated high-side driver IC is required to generate VGS > 10 V relative to the switched rail, especially for low RDS(on) optimization and fast turn-on.
BUK7M45-40EX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- TrenchMOS™
- 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:
- 19A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 10V
- Rds On (Max) @ Id, Vgs:
- 45mOhm @ 5A, 10V
- Vgs(th) (Max) @ Id:
- 4V @ 1mA
- Gate Charge (Qg) (Max) @ Vgs:
- 6.2 nC @ 10 V
- Vgs (Max):
- ±20V
- Input Capacitance (Ciss) (Max) @ Vds:
- 317 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 31W (Tc)
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- LFPAK33
BUK7M45-40EX FAQ
1.How can I place an order for BUK7M45-40EX through Aetrix?
Please submit a Request for Quotation (RFQ) for BUK7M45-40EX 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 BUK7M45-40EX reliable?
The price and inventory of BUK7M45-40EX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK7M45-40EX is usually 5 days.
3.What payment methods are accepted for BUK7M45-40EX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK7M45-40EX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUK7M45-40EX?
BUK7M45-40EX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUK7M45-40EX 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 BUK7M45-40EX?
For technical support, including BUK7M45-40EX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK7M45-40EX requirements.
6.How does Aetrix verify that BUK7M45-40EX is sourced from the original manufacturer or authorized distributors?
All BUK7M45-40EX 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 BUK7M45-40EX meets industry standards.
7.What is the process for return or replacement of BUK7M45-40EX?
All BUK7M45-40EX units undergo pre-shipment inspection (PSI). If there is an issue with BUK7M45-40EX, 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 BUK7M45-40EX part is unused and in its original packaging.
Return procedure for BUK7M45-40EX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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