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Nexperia USA Inc. BUK7Y18-55B,115
- Part No.:
- BUK7Y18-55B,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- FETs, MOSFETs
- Package:
- SC-100, SOT-669
- Datasheet:
-
BUK7Y18-55B,115.pdf
- Description:
- MOSFET N-CH 55V 47.4A LFPAK56
- Quantity:
- Payment:
- Shipping:
Inventory:2,406
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Product details
Overview
BUK7Y18-55B from Nexperia is an AEC-Q101 qualified N-channel TrenchMOS FET in LFPAK (SOT669) package, designed for automotive power switching with 55 V VDS, 47.4 A ID (Tmb = 25 °C), and 12.7 mΩ RDS(on) at VGS = 10 V and Tj = 25 °C. It operates up to 175 °C junction temperature and supports unclamped avalanche energy of 77 mJ, enabling robust use in engine management and ABS systems.
For engineers reviewing the BUK7Y18-55B datasheet, BUK7Y18-55B pinout, BUK7Y18-55B application, or BUK7Y18-55B equivalent, this device is selected for thermally demanding 12 V/24 V automotive loads where standard-level gate drive compatibility, high avalanche ruggedness, and mounting-base thermal performance (Rth(j-mb) = 1.76 K/W) are critical.
Technical Context
This MOSFET uses Nexperia's High-Performance Automotive (HPA) TrenchMOS technology to deliver low on-resistance and stable threshold voltage (VGS(th) = 2–4 V) across -55 °C to 175 °C. Its gate charge profile (QG(tot) = 21.9 nC, QGD = 8.1 nC) supports fast switching with controlled dV/dt in motor and solenoid drive circuits.
The integrated source-drain diode exhibits VSD = 0.85–1.2 V at IS = 20 A and Tj = 25 °C, with trr = 36 ns and Qr = 55 nC, enabling efficient freewheeling in inductive load control without external diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 55 V maximum drain-source voltage - defines safe blocking capability in 24 V automotive systems with transient overvoltage margin. |
| ID | 47.4 A continuous drain current at Tmb = 25 °C - enables direct driving of high-current lamps, solenoids, and small motors without heatsink derating. |
| RDS(on) | 12.7 mΩ typical at VGS = 10 V, ID = 20 A, Tj = 25 °C - minimizes conduction loss and self-heating during sustained load operation. |
| EAS | 77 mJ non-repetitive avalanche energy - ensures single-event surge survivability in inductive switching (e.g., fuel injectors, ABS valves). |
| Rth(j-mb) | 1.76 K/W thermal resistance from junction to mounting base - allows direct PCB copper pad thermal coupling for high-power density layouts. |
| QGD | 8.1 nC gate-drain charge - determines Miller plateau duration and influences switching speed and EMI in PWM-driven applications. |
| VGS(th) | 2–4 V gate-source threshold voltage at Tj = 25 °C - compatible with standard 5 V or 12 V logic-level gate drivers without level-shifting. |
Pinout & Package
Package: LFPAK (SOT669), plastic single-ended surface-mounted package with exposed mounting base connected to drain; optimized for high thermal and current handling in automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 - S | Source | Three parallel source terminals reduce bond wire inductance and improve current sharing for high di/dt switching. |
| 4 - G | Gate | Single gate input with low input capacitance (Ciss = 947–1263 pF) for easy drive with standard gate drivers. |
| Mounting Base - D | Drain | Exposed copper drain pad provides primary thermal path to PCB and serves as high-current drain connection. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive safety-critical systems including ABS and engine control, ensuring reliability under extended temperature and vibration stress. |
| 175 °C maximum junction temperature | Enables operation in under-hood environments without thermal shutdown, supporting compact packaging near heat sources. |
| Standard-level gate drive compatibility | Operates fully enhanced with 10 V gate drive - eliminates need for dedicated high-side gate drivers in 12 V/24 V battery systems. |
| Unclamped avalanche ruggedness | 77 mJ rated energy absorption - protects against inductive kickback in motor and solenoid switching without external snubbers. |
| Low RDS(on) × QG figure-of-merit | ~270 Ω·nC - balances conduction and switching losses for high-efficiency PWM control in power distribution modules. |
Applications
| Advanced Braking Systems (ABS) | Engine Management Systems |
|---|---|
|
Use Scenario: High-speed PWM control of hydraulic solenoid valves in ABS modulators. IC Role / Device Role / Timing Role: Power switch regulating valve coil current with precise duty-cycle control and fast turn-off to prevent pressure overshoot. Use Value: 36 ns reverse recovery time and 77 mJ avalanche rating ensure reliable operation during rapid current interruption and voltage transients. |
Use Scenario: Driving fuel injectors and ignition coils in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Low-side switch delivering high peak current (189 A pulsed) with minimal voltage drop during injection pulses. Use Value: 12.7 mΩ RDS(on) reduces power loss and thermal stress, while 175 °C rating supports placement near hot engine components. |
| Automotive Lighting Control | 12 V/24 V Power Distribution |
|
Use Scenario: On/off and dimming control of LED headlamps and interior lighting. IC Role / Device Role / Timing Role: High-current, low-loss switch managing up to 47.4 A DC load with PWM-based brightness regulation. Use Value: Low gate charge (21.9 nC total) enables clean, low-EMI switching at kHz frequencies without excessive driver power consumption. |
Use Scenario: Centralized power switching in body control modules (BCM) for window lifts, seat adjusters, and HVAC fans. IC Role / Device Role / Timing Role: Robust load switch protecting downstream circuits from overcurrent and short-circuit faults via thermal foldback. Use Value: Mounting-base thermal design (Rth(j-mb) = 1.76 K/W) allows direct integration into high-density PCBs with minimal heatsinking. |
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 VDS, 220 A ID, 1.7 mΩ RDS(on), PowerFLAT 5x6 package, higher current but lower voltage rating. | Targeted at 12 V-only systems requiring ultra-low RDS(on); unsuitable for 24 V or 55 V transient environments. | Select when peak current >100 A is required and system voltage stays ≤16 V; verify avalanche capability separately. |
| IRL8721PBF | 30 V VDS, 71 A ID, 12.5 mΩ RDS(on), TO-220AB package, non-AEC-Q101, lower thermal resistance to ambient. | General-purpose industrial switching only; lacks automotive qualification and high-temperature endurance. | Use only in non-automotive, non-safety-critical 12 V applications where cost and availability outweigh qualification requirements. |
Compared with STL220N4F7AG and IRL8721PBF, BUK7Y18-55B uniquely combines AEC-Q101 compliance, 55 V rating, and LFPAK thermal performance-making it the only choice for thermally constrained, safety-critical 24 V automotive loads requiring guaranteed avalanche ruggedness and long-term reliability.
Availability
BUK7Y18-55B is available at Aetrix Electronics and suitable for advanced braking systems (ABS), engine management units, and 12 V/24 V power distribution modules requiring stable component supply across automotive production lifecycles.
Supply support for BUK7Y18-55B 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 essential efficiency technologies, delivering high-performance, high-reliability discrete and logic devices for automotive, industrial, and consumer markets.
BUK7Y18-55B belongs to Nexperia's High-Performance Automotive (HPA) TrenchMOS product line, engineered specifically for AEC-Q101-compliant power switching in harsh under-hood environments with emphasis on thermal robustness and avalanche survivability.
FAQ
Is BUK7Y18-55B suitable for 24 V commercial vehicle applications?
Yes. With 55 V VDS, AEC-Q101 qualification, and 175 °C maximum junction temperature, BUK7Y18-55B is explicitly designed for 24 V automotive systems-including trucks and buses-where load dump transients (up to ISO 7637-2 Pulse 5a) and high ambient temperatures occur. Its 77 mJ avalanche rating handles inductive spikes from solenoids and motors without external protection.
What is the recommended PCB layout for optimal thermal performance?
Use a minimum 200 mm² copper pour (2 oz/ft²) connected directly to the mounting base (drain) with ≥6 thermal vias (0.3 mm diameter, spaced ≤2 mm apart) to inner ground/power planes. Keep source and gate traces short and wide; route gate signal away from high-dV/dt drain paths to minimize coupling. The SOT669 footprint must match Nexperia's recommended land pattern (SOT669 Rev. 04-10-13).
Does BUK7Y18-55B require a gate resistor for stability?
A gate resistor (typically 10–47 Ω) is recommended to dampen ringing caused by parasitic inductance in gate loops and control dV/dt during switching. This prevents false triggering and EMI issues, especially in high-frequency PWM applications like LED dimming or injector control. The 8.1 nC QGD value makes it sensitive to Miller effect without proper gate impedance control.
Can BUK7Y18-55B replace older BUZ70 or BUK92xx series devices?
BUK7Y18-55B offers lower RDS(on) (12.7 mΩ vs. ~20–30 mΩ), improved thermal resistance (1.76 K/W vs. ~2.5–3.5 K/W), and full AEC-Q101 compliance-making it a functional upgrade for BUZ70/BUK92xx in new designs. However, pinout differs (SOT669 vs. TO-220/SOT404), requiring PCB redesign; no drop-in replacement is possible without layout changes.
BUK7Y18-55B,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:
- 47.4A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 10V
- Rds On (Max) @ Id, Vgs:
- 18mOhm @ 20A, 10V
- Vgs(th) (Max) @ Id:
- 4V @ 1mA
- Gate Charge (Qg) (Max) @ Vgs:
- 21.9 nC @ 10 V
- Vgs (Max):
- ±20V
- Input Capacitance (Ciss) (Max) @ Vds:
- 1263 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 85W (Tc)
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- LFPAK56, Power-SO8
BUK7Y18-55B,115 FAQ
1.How can I place an order for BUK7Y18-55B,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BUK7Y18-55B,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 BUK7Y18-55B,115 reliable?
The price and inventory of BUK7Y18-55B,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK7Y18-55B,115 is usually 5 days.
3.What payment methods are accepted for BUK7Y18-55B,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK7Y18-55B,115 transactions.
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4.How is shipping managed for BUK7Y18-55B,115?
BUK7Y18-55B,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUK7Y18-55B,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 BUK7Y18-55B,115?
For technical support, including BUK7Y18-55B,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK7Y18-55B,115 requirements.
6.How does Aetrix verify that BUK7Y18-55B,115 is sourced from the original manufacturer or authorized distributors?
All BUK7Y18-55B,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 BUK7Y18-55B,115 meets industry standards.
7.What is the process for return or replacement of BUK7Y18-55B,115?
All BUK7Y18-55B,115 units undergo pre-shipment inspection (PSI). If there is an issue with BUK7Y18-55B,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 BUK7Y18-55B,115 part is unused and in its original packaging.
Return procedure for BUK7Y18-55B,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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