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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FETs, MOSFETs

Nexperia USA Inc. BUK9512-55B,127

Name: BUK9512-55B,127
Brand: Nexperia USA Inc.
SKU: BUK9512-55B,127
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK9512-55B,127

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: BUK9512-55B,127.pdf

Description:: MOSFET N-CH 55V 75A TO220AB

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Product details

Overview

BUK9512-55B from NXP Semiconductors is a logic-level N-channel TrenchMOS FET in TO-220AB (SOT78) package, rated for 55 V V_DS, 75 A continuous drain current at T_mb = 25 °C, and 175 °C junction temperature. It delivers 9 mΩ R_DS(on) at V_GS = 10 V and 25 °C, supports automotive AEC-Q101 qualification, and is designed for high-reliability 12 V/24 V load switching in thermally demanding environments.

For engineers reviewing the BUK9512-55B datasheet, BUK9512-55B pinout, BUK9512-55B application, or BUK9512-55B equivalent, this page provides verified technical context, thermal performance data, gate-drive compatibility with 4.5–5 V logic sources, avalanche ruggedness (172 mJ), and real-world use cases in automotive solenoid, lamp, and motor control circuits.

Technical Context

This device employs TrenchMOS technology to achieve low on-resistance and fast switching with Q_GD = 12 nC and t_r = 101 ns at V_DS = 30 V. Its gate threshold voltage ranges from 0.5 V (T_j = 175 °C) to 2.3 V (T_j = −55 °C), enabling robust turn-on under wide temperature extremes.

The integrated source-drain diode exhibits V_SD = 0.85 V at I_S = 25 A and T_j = 25 °C, with t_rr = 55 ns and Q_r = 53 nC, supporting moderate-frequency freewheeling in inductive loads without external diode supplementation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	55 V - Maximum blocking voltage compatible with 24 V automotive systems with margin for transients.
I_D (continuous)	75 A at T_mb = 25 °C - Package-limited current capacity requiring heatsink mounting per TO-220AB thermal design.
R_DS(on)	9 mΩ @ V_GS = 10 V, T_j = 25 °C - Enables <1 W conduction loss at 30 A, reducing thermal stress in power stages.
R_DS(on)	10.2 mΩ @ V_GS = 5 V, T_j = 25 °C - Confirmed logic-level drive capability with standard 5 V microcontrollers or gate drivers.
E_AS	172 mJ unclamped avalanche energy - Supports single-pulse inductive energy absorption without failure in relay or solenoid snubberless designs.
T_j max	175 °C - Qualified for under-hood automotive operation and sustained thermal cycling in industrial controls.
R_th(j-mb)	0.95 K/W - Junction-to-mounting-base thermal resistance enables efficient heat transfer to external heatsinks.

Pinout & Package

Package: TO-220AB (SOT78), plastic single-ended package with heatsink-mounted base; mounting base electrically connected to drain terminal.

Pin/Terminal	Circuit Role	Design Meaning
1 (G)	Gate	Logic-level input controlling channel conduction; requires ≤15 V absolute max rating and drives 31 nC total gate charge.
2 (D)	Drain	Main high-side power path; electrically tied to mounting base for direct heatsink coupling and low-inductance layout.
3 (S)	Source	Power return node; referenced for gate drive; internal source inductance of 7.5 nH affects high-speed switching stability.

Key Features

Feature	Design Value
Logic-level gate drive	Operates fully enhanced at V_GS = 4.5–5 V, eliminating need for level-shifting circuitry in MCU-driven applications.
AEC-Q101 qualified	Validated for automotive critical systems including engine control, body electronics, and ADAS power distribution.
175 °C junction rating	Enables operation in under-hood environments and high-ambient industrial enclosures without derating penalties.
Low R_DS(on) at 5 V	10.2 mΩ typical at V_GS = 5 V ensures minimal conduction loss when driven directly by 5 V logic outputs.
Integrated avalanche ruggedness	172 mJ E_AS allows safe handling of inductive kickback in solenoid and motor commutation without external clamping.

Applications

Automotive Lamp Control

12 V/24 V Solenoid Driver

Use Scenario: High-side switching of headlamps, fog lamps, or interior lighting in modern vehicle body control modules.

IC Role / Device Role / Timing Role: Power switch managing up to 75 A peak load current with fast turn-on (t_r = 101 ns) and low R_DS(on) to minimize thermal rise during PWM dimming.

Use Value: Eliminates mechanical relay wear and contact bounce while maintaining <1.5 W conduction loss at 30 A, improving system longevity and EMI profile.

Use Scenario: Driving fuel injectors, HVAC actuators, or transmission shift solenoids in engine management systems.

IC Role / Device Role / Timing Role: High-current, high-reliability switch with 172 mJ avalanche rating to absorb inductive energy during de-energization without external diodes.

Use Value: Reduces bill-of-materials count and PCB area by integrating robust flyback protection, meeting AEC-Q101 requirements out-of-box.

Industrial Motor Starter

DC Power Distribution Unit

Use Scenario: Soft-start and overcurrent-protected control of small DC motors (e.g., fans, pumps) in factory automation equipment.

IC Role / Device Role / Timing Role: Main power switch with 175 °C thermal rating enabling continuous operation in sealed enclosures without forced air cooling.

Use Value: Sustains 56 A continuous current at T_mb = 100 °C, allowing compact thermal design and eliminating need for oversized heatsinks.

Use Scenario: Load switching and redundancy management in 24 V industrial power distribution panels with hot-swap capability.

IC Role / Device Role / Timing Role: High-side MOSFET providing controlled inrush limiting and fault isolation via gate-controlled turn-off.

Use Value: Leverages 322 A pulsed peak current rating (t_p ≤ 10 µs) to handle capacitor charging surges without latch-up or thermal runaway.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel logic-level power switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP75NF55	55 V V_DS, 75 A I_D, but R_DS(on) = 12.5 mΩ @ V_GS = 10 V; not AEC-Q101 qualified.	Targeted at industrial/commercial power supplies, not automotive-grade reliability or temperature range.	Select when cost sensitivity outweighs automotive qualification and higher R_DS(on) is acceptable.
IRF1404ZLPbF	40 V V_DS, 130 A I_D, R_DS(on) = 3.8 mΩ @ V_GS = 10 V; logic-level but lower voltage rating.	Optimized for 12 V battery systems only; unsuitable for 24 V or transient-tolerant 55 V applications.	Select only for 12 V-only designs where higher current and lower R_DS(on) justify reduced voltage margin.

Compared with STP75NF55 and IRF1404ZLPbF, the BUK9512-55B uniquely balances AEC-Q101 compliance, 55 V rating, and 10.2 mΩ R_DS(on) at 5 V drive-making it the only choice for thermally constrained, safety-critical 24 V automotive switching where qualification and gate-drive simplicity are non-negotiable.

Availability

BUK9512-55B is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor control, and 24 V DC power distribution requiring stable component supply across multi-year production cycles.

Supply support for BUK9512-55B 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

This part belongs to NXP's TrenchMOS logic-level power FET product line, engineered specifically for high-reliability, high-current switching in automotive and industrial environments where AEC-Q101 qualification, thermal resilience, and simplified gate drive are essential.

FAQ

Is BUK9512-55B suitable for direct drive from a 3.3 V microcontroller?

No. The device requires ≥4.5 V gate drive for reliable enhancement; at 3.3 V, R_DS(on) rises significantly beyond 100 mΩ, causing excessive conduction loss and thermal risk. A gate driver or level shifter is mandatory for 3.3 V MCU interfaces.

What is the maximum allowable mounting base temperature for continuous 75 A operation?

75 A is specified only at T_mb = 25 °C. As mounting base temperature increases, current must be derated per Figure 1: at T_mb = 100 °C, continuous current drops to 56 A. Thermal design must ensure T_mb remains within limits for target load current.

Does the mounting base require electrical isolation from the heatsink?

Yes. The mounting base is internally connected to the drain (Pin 2). If the heatsink is grounded or at a different potential, an isolating pad (e.g., mica or polymer film) with appropriate dielectric strength and thermal conductivity must be used to prevent short circuits.

Can BUK9512-55B replace a mechanical relay in automotive applications?

Yes-specifically for resistive and moderately inductive loads (e.g., lamps, solenoids, small motors). Its 172 mJ avalanche rating handles unclamped inductive energy, and AEC-Q101 qualification ensures reliability matching relay lifetime in vibration-prone environments.

BUK9512-55B,127 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: TrenchMOS™

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 55 V

Current - Continuous Drain (Id) @ 25°C:: 75A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 4.5V, 10V

Rds On (Max) @ Id, Vgs:: 10mOhm @ 25A, 10V

Vgs(th) (Max) @ Id:: 2V @ 1mA

Gate Charge (Qg) (Max) @ Vgs:: 31 nC @ 5 V

Vgs (Max):: ±15V

Input Capacitance (Ciss) (Max) @ Vds:: 3693 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 157W (Tc)

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AB

BUK9512-55B,127 FAQ

1.How can I place an order for BUK9512-55B,127 through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK9512-55B,127 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 BUK9512-55B,127 reliable?

The price and inventory of BUK9512-55B,127 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9512-55B,127 is usually 5 days.

3.What payment methods are accepted for BUK9512-55B,127?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK9512-55B,127 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK9512-55B,127?

BUK9512-55B,127 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK9512-55B,127 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 BUK9512-55B,127?

For technical support, including BUK9512-55B,127 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9512-55B,127 requirements.

6.How does Aetrix verify that BUK9512-55B,127 is sourced from the original manufacturer or authorized distributors?

All BUK9512-55B,127 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 BUK9512-55B,127 meets industry standards.

7.What is the process for return or replacement of BUK9512-55B,127?

All BUK9512-55B,127 units undergo pre-shipment inspection (PSI). If there is an issue with BUK9512-55B,127, 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 BUK9512-55B,127 part is unused and in its original packaging.

Return procedure for BUK9512-55B,127:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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