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Nexperia USA Inc. BUK7Y12-40EX
- Part No.:
- BUK7Y12-40EX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- FETs, MOSFETs
- Package:
- SC-100, SOT-669
- Datasheet:
-
BUK7Y12-40EX.pdf
- Description:
- MOSFET N-CH 40V 52A LFPAK56
- Quantity:
- Payment:
- Shipping:
Inventory:4,371
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Product details
Overview
BUK7Y12-40EX from Nexperia is a standard-level N-channel MOSFET rated for 40 V drain-source voltage, 12 mΩ RDS(on) at VGS = 10 V and Tj = 25 °C, and 52 A continuous drain current at Tmb = 25 °C. Packaged in LFPAK56 (SOT669), it delivers automotive-grade reliability with AEC-Q101 qualification, 175 °C junction rating, and repetitive avalanche capability - deployed in 12 V automotive motor, lamp, and solenoid control circuits.
For engineers reviewing the BUK7Y12-40EX datasheet, BUK7Y12-40EX pinout, BUK7Y12-40EX application, or BUK7Y12-40EX equivalent, key selection criteria include its true standard-level gate (VGS(th) > 1 V at 175 °C), low thermal resistance (Rth(j-mb) = 2.31 K/W), and robust 22.75 mJ unclamped avalanche energy rating under defined test conditions.
Technical Context
This MOSFET uses TrenchMOS technology to achieve low on-resistance and fast switching performance while maintaining ruggedness. Its gate threshold voltage remains functional up to 175 °C, enabling stable operation in thermally demanding engine bay environments without requiring elevated gate drive.
The device integrates a source-drain diode with 15 A forward current capability and 15.3 ns reverse recovery time at 25 °C, supporting synchronous rectification and inductive load commutation. Mounting base (drain-connected) thermal path enables direct PCB copper pour attachment for efficient heat extraction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 40 V - Maximum allowable drain-to-source blocking voltage in automotive 12 V systems with load dump transients. |
| RDS(on) | 9.3 mΩ (typ) at VGS = 10 V, ID = 15 A, Tj = 25 °C - Enables <1.4 W conduction loss at 37 A continuous current (Tmb = 100 °C). |
| ID (cont) | 52 A at Tmb = 25 °C - Supports high-current loads like starter relays or HVAC blowers when mounted on adequate copper area. |
| EAS | 22.75 mJ - Single-pulse unclamped avalanche energy at ID = 52 A, limiting junction temperature to 175 °C; ensures survivability during inductive turn-off events. |
| Rth(j-mb) | 2.31 K/W - Thermal resistance from junction to mounting base; enables ~28 W power dissipation before reaching 175 °C at 25 °C board temperature. |
| QGD | 5.2 nC - Gate-drain charge determines Miller plateau duration; supports clean switching in 100 kHz–500 kHz PWM applications with minimal shoot-through risk. |
| VGS(th) | 1 V (min) at Tj = 175 °C - Ensures reliable turn-on with standard 5 V or 3.3 V logic-level microcontrollers without gate boosting. |
Pinout & Package
LFPAK56 (SOT669) is a 4-lead surface-mount package with exposed mounting base connected to drain. It provides superior thermal and electrical performance over SO-8, with 3 parallel source pins for low-inductance current return and optimized gate routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 (S) | Source | Three paralleled source terminals reduce source inductance and improve current sharing in high-di/dt switching. |
| 4 (G) | Gate | Single gate input with 15 nC total gate charge; compatible with standard MOSFET drivers without requiring external gate resistors for basic operation. |
| Mounting Base (mb) | Drain | Exposed copper pad electrically and thermally connected to drain; must be soldered to ≥100 mm² of 2 oz copper for rated power handling. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test requirements including HTRB, HTGB, TC, and UHAST - suitable for engine control, transmission, and body electronics. |
| Repetitive avalanche rated | Rated for repeated unclamped inductive switching events up to 22.75 mJ, enabling robust protection in solenoid and motor driver designs without external snubbers. |
| 175 °C maximum junction temperature | Enables operation in under-hood environments where ambient temperatures exceed 125 °C, reducing need for derating or forced cooling. |
| True standard-level gate | VGS(th) ≥ 1 V at 175 °C ensures reliable turn-on using standard 5 V MCU GPIOs or CAN/LIN transceiver outputs without level-shifting circuitry. |
| Low RDS(on) × QG figure-of-merit | 9.3 mΩ × 15 nC = 140 mΩ·nC - balances conduction and switching losses for high-efficiency 12 V DC-DC and load-switching applications. |
Applications
| Engine Cooling Fan Control | Automatic Transmission Solenoid Driver |
|---|---|
|
Use Scenario: PWM-controlled 12 V brushless fan module operating continuously at 85 °C ambient under hood. IC Role / Device Role / Timing Role: High-side or low-side power switch regulating fan speed via 20 kHz PWM with 100 ns dead-time control. Use Value: 9.3 mΩ RDS(on) limits conduction loss to <0.6 W at 25 A, while 2.31 K/W thermal resistance maintains Tj < 150 °C on 4-layer PCB with 120 mm² drain copper. |
Use Scenario: 12 V solenoid actuator in 8-speed automatic transmission requiring precise 10–200 ms pulse-width modulation for shift timing. IC Role / Device Role / Timing Role: Low-side switch delivering 30 A peak current with <10 ns fall time to meet ASAM MCAL timing constraints. Use Value: 6 ns fall time and 15.3 ns reverse recovery support accurate solenoid current ramp control; avalanche rating prevents failure during coil de-energization. |
| LED Headlamp Dimming Circuit | Start-Stop System Load Disconnect |
|
Use Scenario: 40 W LED headlamp array with analog dimming and short-circuit protection in compact front-end module. IC Role / Device Role / Timing Role: High-side switch implementing current-limiting dimming and overcurrent shutdown via integrated sense FET feedback. Use Value: 12 mΩ max RDS(on) ensures <1.2 W loss at 10 A, while 500 µA max IDSS at 175 °C prevents false triggering in hot-cranking conditions. |
Use Scenario: Battery disconnect switch isolating starter battery from accessory loads during engine cranking (cold-crank to 5.5 V). IC Role / Device Role / Timing Role: Bidirectional load switch controlled by BCM to enable/disable 12 V bus segments during start-stop cycles. Use Value: 40 V VDS withstands ISO 7637-2 pulse 4 (load dump); 210 A peak drain current handles 10 ms cranking surges without latch-up. |
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), 175 °C, PowerFLAT 5x6 - lower RDS(on) but higher QG (32 nC) and no AEC-Q101 documentation in public datasheet. | Preferred for ultra-low-loss 12 V bus switches where gate drive strength permits higher QG; not validated for automotive qualification-critical functions. | Select only if AEC-Q101 compliance is not required and thermal design accommodates higher switching loss. |
| ON Semiconductor NTMFS4C09NT1G | 40 V, 9.5 mΩ RDS(on), 175 °C, SO-8 - same RDS(on) spec but SO-8 package yields Rth(j-mb) ≈ 3.5 K/W and no mounting base connection. | Suitable for non-automotive industrial controls where thermal margin is less constrained and footprint compatibility with legacy SO-8 layouts is needed. | Choose when board space allows larger SO-8 footprint and thermal budget permits ~40 % higher junction temperature rise at same power. |
Compared with STL220N4F7AG and NTMFS4C09NT1G, BUK7Y12-40EX uniquely combines AEC-Q101 certification, LFPAK56's 2.31 K/W thermal resistance, and verified 1 V VGS(th) at 175 °C - making it the only option qualified for safety-critical automotive load switching where thermal stability and gate drive simplicity are mandatory.
Availability
BUK7Y12-40EX is available at Aetrix Electronics and suitable for automotive engine control units, transmission control modules, and body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BUK7Y12-40EX 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 specializing in high-performance, high-reliability discrete, logic, and MOSFET solutions, with core expertise in automotive, industrial, and mobile applications.
BUK7Y12-40EX belongs to Nexperia's Automotive Logic and Power portfolio, engineered specifically for AEC-Q101-compliant 12 V power switching in harsh-temperature automotive subsystems - emphasizing ruggedness, thermal efficiency, and gate-drive compatibility with mainstream microcontrollers.
FAQ
Is BUK7Y12-40EX pin-compatible with standard SO-8 MOSFETs?
No. BUK7Y12-40EX uses the LFPAK56 (SOT669) package with 4 leads and an exposed mounting base connected to drain - physically incompatible with SO-8 footprints. Its pin 1–3 are paralleled sources, pin 4 is gate, and the base is drain. PCB layout requires dedicated SOT669 land pattern per Nexperia's recommended footprint.
What is the maximum continuous drain current at 100 °C mounting base temperature?
Per Figure 1 in the datasheet, the maximum continuous drain current is 37 A at Tmb = 100 °C and VGS = 10 V. This derating reflects thermal limitations - junction temperature reaches 175 °C at this condition, consistent with the device's absolute maximum rating.
Does BUK7Y12-40EX require a gate resistor for safe operation?
A gate resistor is not mandatory for basic switching but is recommended to control dV/dt and prevent oscillation. With 15 nC total gate charge and typical gate driver output impedance, a 5 Ω to 22 Ω series resistor optimizes EMI and ringing suppression without significantly increasing switching time - especially critical in high-frequency PWM motor control.
Can BUK7Y12-40EX be used in high-side switching configurations?
Yes - its 40 V VDS rating and 175 °C junction capability support high-side 12 V automotive switching. However, gate drive must provide VGS ≥ 10 V referenced to source, requiring either a bootstrap circuit or isolated gate driver. The device itself has no integrated level shifter or charge pump.
BUK7Y12-40EX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- TrenchMOS™
- Package/Case:
- SC-100, SOT-669
- 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:
- 52A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 10V
- Rds On (Max) @ Id, Vgs:
- 12mOhm @ 15A, 10V
- Vgs(th) (Max) @ Id:
- 4V @ 1mA
- Gate Charge (Qg) (Max) @ Vgs:
- 15 nC @ 10 V
- Vgs (Max):
- ±20V
- Input Capacitance (Ciss) (Max) @ Vds:
- 1039 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 65W (Tc)
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- LFPAK56, Power-SO8
BUK7Y12-40EX FAQ
1.How can I place an order for BUK7Y12-40EX through Aetrix?
Please submit a Request for Quotation (RFQ) for BUK7Y12-40EX 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 BUK7Y12-40EX reliable?
The price and inventory of BUK7Y12-40EX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK7Y12-40EX is usually 5 days.
3.What payment methods are accepted for BUK7Y12-40EX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK7Y12-40EX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUK7Y12-40EX?
BUK7Y12-40EX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUK7Y12-40EX 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 BUK7Y12-40EX?
For technical support, including BUK7Y12-40EX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK7Y12-40EX requirements.
6.How does Aetrix verify that BUK7Y12-40EX is sourced from the original manufacturer or authorized distributors?
All BUK7Y12-40EX 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 BUK7Y12-40EX meets industry standards.
7.What is the process for return or replacement of BUK7Y12-40EX?
All BUK7Y12-40EX units undergo pre-shipment inspection (PSI). If there is an issue with BUK7Y12-40EX, 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 BUK7Y12-40EX part is unused and in its original packaging.
Return procedure for BUK7Y12-40EX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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