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

Nexperia USA Inc. BUK9612-55B,118

Name: BUK9612-55B,118
Brand: Nexperia USA Inc.
SKU: BUK9612-55B,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK9612-55B,118

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: BUK9612-55B,118.pdf

Description:: MOSFET N-CH 55V 75A D2PAK

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Product details

Overview

BUK9612-55B,118 from Nexperia is a logic-level N-channel TrenchMOS FET in D2PAK (SOT404) 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 5 V gate drive, and is AEC-Q101 qualified for automotive power switching of 12 V/24 V loads including motors and solenoids.

For engineers reviewing the BUK9612-55B,118 datasheet, BUK9612-55B,118 pinout, BUK9612-55B,118 application, or BUK9612-55B,118 equivalent, key selection criteria include logic-level gate compatibility, 175 °C thermal rating, avalanche energy (172 mJ), low R_DS(on) at 5 V drive, and D2PAK mounting-base thermal performance (R_th(j-mb) = 0.95 K/W).

Technical Context

This device uses TrenchMOS technology to achieve low conduction losses and stable threshold voltage across temperature (V_GS(th) = 0.5–2.3 V from −55 °C to 175 °C). Its gate charge profile (Q_G(tot) = 31 nC, Q_GD = 12 nC) enables fast switching with controlled dV/dt in high-current automotive loads.

The integrated source-drain diode exhibits V_SD = 0.85 V at 25 A and T_j = 25 °C, with t_rr = 55 ns and Q_r = 53 nC-critical for freewheeling in inductive motor/solenoid control. Thermal design is anchored to the mounting base (not ambient), with R_th(j-mb) = 0.95 K/W enabling high-power dissipation in constrained chassis environments.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	55 V - Maximum blocking voltage for 12 V/24 V automotive battery systems with load-dump margin.
R_DS(on) @ V_GS = 5 V	10.2 mΩ (typ) - Enables efficient 75 A switching with minimal I²R loss using standard 5 V MCU GPIOs.
P_tot	157 W @ T_mb = 25 °C - Power handling capacity defined by mounting base temperature, not ambient air.
T_j max	175 °C - Supports operation in under-hood environments without derating for thermal shutdown.
E_AS	172 mJ - Unclamped avalanche energy rating ensures robustness against inductive kickback in motor/solenoid circuits.
Q_G(tot)	31 nC - Total gate charge enabling <100 ns turn-on/off times with 10 Ω external gate resistor.
R_th(j-mb)	0.95 K/W - Low junction-to-mounting-base thermal resistance allows direct heatsinking to metal chassis.

Pinout & Package

Package: D2PAK (SOT404), plastic single-ended surface-mounted package with 3 leads (lead 2 cropped); mounting base (mb) electrically connected to drain and serves as primary thermal path.

Pin/Terminal	Circuit Role	Design Meaning
1	Gate (G)	Control input requiring ≥4.5 V for full enhancement; compatible with 5 V logic; low Q_GS (6 nC) enables fast turn-on.
2	Drain (D)	Not externally accessible-internally bonded to mounting base; forms primary high-current output and thermal interface.
3	Source (S)	Power return path; referenced to system ground; carries full load current and supports internal body diode conduction.
Mounting Base (mb)	Drain / Thermal Interface	Electrically tied to drain; provides low-inductance, high-current connection and dominant heat transfer path (R_th(j-mb) = 0.95 K/W).

Key Features

Feature	Design Value
Logic-level gate drive	Operates fully enhanced at V_GS = 4.5–5 V, eliminating need for gate driver ICs in MCU-controlled 12 V/24 V systems.
AEC-Q101 qualification	Validated for automotive safety-critical applications including engine control, body electronics, and ADAS power stages.
175 °C junction rating	Enables uninterrupted operation in under-hood locations where ambient temperatures exceed 125 °C.
Low R_DS(on) at elevated T_j	R_DS(on) = 24 mΩ @ V_GS = 5 V, I_D = 25 A, T_j = 175 °C-ensures predictable on-state loss in worst-case thermal conditions.
High avalanche ruggedness	172 mJ unclamped E_AS withstands repetitive inductive energy spikes without degradation in motor/solenoid switching.

Applications

Automotive Body Control Module (BCM)

12 V Starter Solenoid Driver

Use Scenario: Switching high-current door locks, seat heaters, and lighting loads in modern BCMs.

IC Role / Device Role / Timing Role: High-side or low-side power switch controlling up to 75 A resistive/inductive loads.

Use Value: Eliminates need for discrete gate drivers due to 5 V logic compatibility and sustains 175 °C operation near HVAC units.

Use Scenario: Driving starter solenoid coils in 12 V passenger vehicles during cranking.

IC Role / Device Role / Timing Role: Low-side switch enabling precise timing of solenoid engagement via MCU PWM or digital control.

Use Value: Withstands repeated 322 A peak currents (t_p ≤10 µs) and absorbs inductive flyback energy (172 mJ E_AS) without failure.

24 V Commercial Vehicle Lighting

Industrial DC Motor H-Bridge Leg

Use Scenario: Controlling LED headlamps and auxiliary lighting in trucks and buses with 24 V nominal systems.

IC Role / Device Role / Timing Role: High-current, thermally robust switch managing up to 75 A steady-state current with fast turn-off (t_f = 75 ns).

Use Value: Maintains <10 mΩ R_DS(on) at 5 V drive even at 100 °C mounting base, minimizing thermal runaway risk.

Use Scenario: One leg of an H-bridge driving brushed DC motors in industrial actuators and pumps.

IC Role / Device Role / Timing Role: Power stage switch with integrated body diode (V_SD = 0.85 V) enabling efficient freewheeling.

Use Value: Reverse recovery time (t_rr = 55 ns) and recovered charge (Q_r = 53 nC) reduce switching losses and EMI in 20 kHz PWM operation.

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
STL220N5LF8AG	60 V V_DS, 220 A I_D, 1.8 mΩ R_DS(on) @ 10 V, but requires 10 V gate drive for full spec; not AEC-Q101 qualified.	Higher current/power capability but unsuitable for automotive qualification-critical designs.	Select only for non-automotive 24 V industrial systems needing lower R_DS(on) and higher I_D.
IRF1404ZLPBF	40 V V_DS, 195 A I_D, 3.7 mΩ R_DS(on) @ 10 V; logic-level but only rated to 175 °C junction, no AEC-Q101 certification.	Limited to 40 V systems; lacks automotive qualification and avalanche energy rating (E_AS unspecified).	Acceptable for cost-sensitive 12 V non-automotive motor drives where qualification and 55 V margin are not required.

Compared with STL220N5LF8AG and IRF1404ZLPBF, the BUK9612-55B,118 uniquely combines AEC-Q101 qualification, 55 V rating, 5 V logic compatibility, and 172 mJ avalanche energy-making it the only drop-in solution for thermally demanding automotive power switching where reliability and compliance are mandatory.

Availability

BUK9612-55B,118 is available at Aetrix Electronics and suitable for automotive body control modules, 12 V/24 V solenoid drivers, and industrial DC motor controllers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for BUK9612-55B,118 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-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified MOSFETs and ESD protection.

The BUK9612-55B belongs to Nexperia's TrenchMOS logic-level automotive power FET product line, engineered specifically for robust, high-current switching in space-constrained, thermally aggressive automotive environments.

FAQ

Is BUK9612-55B,118 pin-compatible with other D2PAK MOSFETs?

Yes-it uses standard SOT404 (D2PAK) footprint with pins 1 (G), 3 (S), and mounting base (D). Pin 2 is internally connected to drain and not externally accessible. PCB layout must accommodate the metal mounting base as the primary drain terminal and thermal interface, matching industry-standard D2PAK land patterns.

What is the maximum continuous drain current at 100 °C mounting base temperature?

At T_mb = 100 °C and V_GS = 5 V, the maximum continuous drain current is 56 A per Figure 1 in the datasheet. This reflects thermal derating due to reduced power dissipation capability as mounting base temperature rises, independent of ambient conditions.

Does BUK9612-55B,118 require a gate resistor for safe operation?

Yes-a series gate resistor (typically 10 Ω) is recommended to control dI/dt and suppress oscillation during switching. The device's Q_G(tot) = 31 nC and Q_GD = 12 nC make it sensitive to ringing without proper gate drive impedance, especially in high-di/dt motor/solenoid applications.

Can BUK9612-55B,118 be used in parallel configurations?

Yes-its positive temperature coefficient of R_DS(on) (increasing with junction temperature) enables inherent current sharing when paralleled. However, matched gate drive layout, symmetrical thermal mounting, and individual gate resistors are required to ensure balanced dynamic current distribution and avoid shoot-through risks.

BUK9612-55B,118 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: TrenchMOS™

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

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:: 75A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 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:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

BUK9612-55B,118 FAQ

1.How can I place an order for BUK9612-55B,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK9612-55B,118 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 BUK9612-55B,118 reliable?

The price and inventory of BUK9612-55B,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9612-55B,118 is usually 5 days.

3.What payment methods are accepted for BUK9612-55B,118?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK9612-55B,118 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK9612-55B,118?

BUK9612-55B,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK9612-55B,118 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 BUK9612-55B,118?

For technical support, including BUK9612-55B,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9612-55B,118 requirements.

6.How does Aetrix verify that BUK9612-55B,118 is sourced from the original manufacturer or authorized distributors?

All BUK9612-55B,118 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 BUK9612-55B,118 meets industry standards.

7.What is the process for return or replacement of BUK9612-55B,118?

All BUK9612-55B,118 units undergo pre-shipment inspection (PSI). If there is an issue with BUK9612-55B,118, 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 BUK9612-55B,118 part is unused and in its original packaging.

Return procedure for BUK9612-55B,118:

1.Submit a request within 90 days.

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

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