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Nexperia USA Inc. BUK9Y12-55B,115
- Part No.:
- BUK9Y12-55B,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- FETs, MOSFETs
- Package:
- SC-100, SOT-669
- Datasheet:
-
BUK9Y12-55B,115.pdf
- Description:
- MOSFET N-CH 55V 61.8A LFPAK56
- Quantity:
- Payment:
- Shipping:
Inventory:3,596
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Product details
Overview
BUK9Y12-55B from Nexperia is an AEC-Q101-qualified N-channel TrenchMOS logic-level power MOSFET in LFPAK (SOT669) package, rated for 55 V VDS, 61.8 A ID at 5 V gate drive, and 175 °C junction temperature - designed for automotive 12 V/24 V load switching including ABS actuators and solenoid drivers.
For engineers reviewing the BUK9Y12-55B datasheet, BUK9Y12-55B pinout, BUK9Y12-55B application, or BUK9Y12-55B equivalent, this device delivers low RDS(on) (9.1 mΩ typ @ 5 V, 25 °C), high avalanche ruggedness (129 mJ), and thermally robust mounting-base thermal resistance (1.42 K/W) critical for under-hood power control.
Technical Context
This MOSFET uses TrenchMOS technology to achieve enhanced conduction efficiency and gate-drive compatibility with 3.3 V/5 V microcontrollers. Its threshold voltage (VGS(th)) ranges from 0.5 V to 2.45 V across -55 °C to 175 °C, enabling stable turn-on in wide-temperature automotive environments.
The device integrates a robust intrinsic body diode (VSD = 0.85 V @ 20 A, Tj = 25 °C) and supports unclamped inductive switching via non-repetitive avalanche energy rating of 129 mJ - essential for motor and solenoid freewheeling without external snubbers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 55 V - Maximum drain-source blocking voltage; supports 24 V automotive systems with margin against load-dump transients. |
| ID @ VGS = 5 V | 61.8 A - Continuous drain current at 25 °C mounting base; enables high-current loads without external gate drivers. |
| RDS(on) @ 5 V | 9.1 mΩ typ - Low on-resistance reduces conduction loss and self-heating in high-duty-cycle switching. |
| Tj max | 175 °C - Junction temperature rating allows operation in engine bay or near powertrain components. |
| Rth(j-mb) | 1.42 K/W - Thermal resistance from junction to mounting base; enables efficient heat transfer to PCB copper or heatsink. |
| EAS | 129 mJ - Non-repetitive avalanche energy; sustains inductive kickback from motors/solenoids without failure. |
| QGD | 13 nC - Gate-drain charge determines switching speed and Miller-effect immunity during hard commutation. |
Pinout & Package
Package: LFPAK (SOT669) - plastic single-ended surface-mounted package with exposed mounting base for thermal and electrical connection to drain.
| 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. |
| 4 | Gate (G) | Single gate input optimized for logic-level drive; compatible with 3.3 V and 5 V MCU GPIOs. |
| Mounting Base (mb) | Drain (D) | Exposed copper pad electrically connected to drain; serves as primary thermal path and high-current return node. |
Key Features
| Feature | Design Value |
|---|---|
| Logic-level gate drive | Operates fully enhanced at VGS = 4.5 V - eliminates need for level-shifting or gate driver ICs in MCU-based designs. |
| AEC-Q101 qualification | Validated for automotive safety-critical applications including braking and chassis control per ISO/TS 16949 requirements. |
| Thermal robustness | Rated for continuous operation up to 175 °C junction temperature - suitable for under-hood placement without derating. |
| Low RDS(on) at 5 V | 9.1 mΩ typical ensures <1 W conduction loss at 30 A - reduces thermal design burden and improves system efficiency. |
| High avalanche capability | 129 mJ EAS supports reliable inductive load switching without external protection components. |
Applications
| Advanced Braking Systems (ABS) | Engine Control Solenoids |
|---|---|
|
Use Scenario: High-speed PWM control of hydraulic valve solenoids in ABS modulators during emergency braking events. IC Role / Device Role / Timing Role: Power switch delivering precise current pulses to solenoid coils with fast turn-on (<29 ns td(on)) and controlled fall time (63 ns tf). Use Value: Enables sub-millisecond actuation response and repeatable pressure modulation due to low QGD and stable RDS(on) over temperature. |
Use Scenario: On/off control of fuel injector or EGR valve solenoids in gasoline/diesel engine management units. IC Role / Device Role / Timing Role: High-current (up to 61.8 A) load switch interfacing directly with 5 V microcontroller outputs. Use Value: Eliminates external gate driver; withstands repeated 175 °C thermal cycling and automotive load-dump transients up to 55 V. |
| 12 V/24 V Body Control Modules | Electric Power Steering (EPS) Motor Drivers |
|
Use Scenario: Driving lamps, window lifters, seat adjusters, and HVAC blowers in centralized body control units. IC Role / Device Role / Timing Role: Protected high-side or low-side switch with integrated body diode for inductive flyback handling. Use Value: Reduces BOM count by integrating avalanche ruggedness and thermal performance - no external TVS or heatsink required for 30 A loads. |
Use Scenario: Half-bridge leg in EPS motor phase control, managing bidirectional current up to 43.8 A at 100 °C mounting base. IC Role / Device Role / Timing Role: Low-RDS(on) power stage enabling high-efficiency PWM commutation with minimal conduction loss. Use Value: Achieves >97% efficiency at 20 A due to 9.1 mΩ RDS(on) and low Ciss/Coss ratio - critical for battery life and thermal management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-channel logic-level power MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STL220N4F7AG | 40 V VDS, 220 A ID, 1.4 mΩ RDS(on) @ 10 V - higher current but lower voltage rating and non-automotive grade. | Not AEC-Q101 qualified; unsuitable for safety-critical ABS or EPS; limited to 12 V non-safety systems. | Select only for cost-sensitive 12 V industrial loads where automotive qualification is not required. |
| IRF1404ZPBF | 40 V VDS, 195 A ID, 3.8 mΩ RDS(on) @ 10 V - requires 10 V gate drive; no logic-level support or AEC qualification. | Lacks 5 V drive compatibility and thermal rating beyond 175 °C; not validated for automotive vibration/shock. | Use only in legacy 40 V designs with dedicated 10 V gate drivers; avoid in new automotive designs. |
Compared with STL220N4F7AG and IRF1404ZPBF, BUK9Y12-55B uniquely combines AEC-Q101 compliance, true 5 V logic-level operation, 55 V rating, and 175 °C junction capability - making it the only drop-in solution for next-generation automotive power switching where safety, thermal margin, and MCU direct-drive are mandatory.
Availability
BUK9Y12-55B is available at Aetrix Electronics and suitable for advanced braking systems (ABS), engine control solenoids, and electric power steering (EPS) motor drivers requiring stable component supply across automotive production lifecycles.
Supply support for BUK9Y12-55B 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.
The BUK9Y series belongs to Nexperia's automotive-qualified TrenchMOS portfolio, engineered specifically for robust, logic-level power switching in harsh-temperature vehicle subsystems such as chassis, powertrain, and body electronics.
FAQ
Is BUK9Y12-55B suitable for 24 V commercial vehicle applications?
Yes - its 55 V VDS rating provides 2× margin over nominal 24 V systems and accommodates ISO 7637-2 load-dump transients up to 55 V. The AEC-Q101 qualification and 175 °C Tj rating confirm suitability for heavy-duty truck and bus electronic control units operating in extended ambient conditions.
What is the maximum continuous current at 100 °C mounting base temperature?
At Tmb = 100 °C and VGS = 5 V, the datasheet specifies ID = 43.8 A (Table 4). This reflects thermal derating due to reduced heat dissipation capacity - consistent with the 106 W Ptot rating at 25 °C and Rth(j-mb) = 1.42 K/W.
Does BUK9Y12-55B require a gate resistor for automotive PWM operation?
A gate resistor is recommended to control dV/dt and prevent parasitic oscillation. With QG(tot) = 32 nC and typical MCU output impedance, a 10 Ω resistor (as used in the datasheet's SOA test setup) limits peak gate current and ensures clean 29 ns turn-on delay and 100 ns turn-off delay under real-world PCB layout conditions.
Can the mounting base be soldered directly to a 2 oz copper plane for thermal management?
Yes - the SOT669 LFPAK package is designed for direct soldering of the exposed mounting base to a large copper pour or thermal pad. Nexperia recommends ≥100 mm² of 2 oz copper connected via ≥6 thermal vias (0.3 mm diameter) to internal ground planes to achieve the specified 1.42 K/W Rth(j-mb).
BUK9Y12-55B,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- TrenchMOS™
- Package/Case:
- SC-100, SOT-669
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 55 V
- Current - Continuous Drain (Id) @ 25°C:
- 61.8A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 5V, 10V
- Rds On (Max) @ Id, Vgs:
- 11mOhm @ 20A, 10V
- Vgs(th) (Max) @ Id:
- 2.15V @ 1mA
- Gate Charge (Qg) (Max) @ Vgs:
- 32 nC @ 5 V
- Vgs (Max):
- ±15V
- Input Capacitance (Ciss) (Max) @ Vds:
- 2880 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 106W (Tc)
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- LFPAK56, Power-SO8
BUK9Y12-55B,115 FAQ
1.How can I place an order for BUK9Y12-55B,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BUK9Y12-55B,115 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 BUK9Y12-55B,115 reliable?
The price and inventory of BUK9Y12-55B,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9Y12-55B,115 is usually 5 days.
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4.How is shipping managed for BUK9Y12-55B,115?
BUK9Y12-55B,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUK9Y12-55B,115 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 BUK9Y12-55B,115?
For technical support, including BUK9Y12-55B,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9Y12-55B,115 requirements.
6.How does Aetrix verify that BUK9Y12-55B,115 is sourced from the original manufacturer or authorized distributors?
All BUK9Y12-55B,115 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 BUK9Y12-55B,115 meets industry standards.
7.What is the process for return or replacement of BUK9Y12-55B,115?
All BUK9Y12-55B,115 units undergo pre-shipment inspection (PSI). If there is an issue with BUK9Y12-55B,115, 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 BUK9Y12-55B,115 part is unused and in its original packaging.
Return procedure for BUK9Y12-55B,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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