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

Nexperia USA Inc. BUK9629-100B,118

Name: BUK9629-100B,118
Brand: Nexperia USA Inc.
SKU: BUK9629-100B,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK9629-100B,118

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

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

Datasheet:: BUK9629-100B,118.pdf

Description:: MOSFET N-CH 100V 46A D2PAK

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Product details

Overview

BUK9629-100B from Nexperia is a logic-level N-channel TrenchMOS FET in D2PAK (SOT404) package, rated for 100 V drain-source voltage, 46 A continuous drain current at 25 °C mounting base temperature, and 157 W total power dissipation. It features 22–27 mΩ R_DS(on) at V_GS = 10 V / I_D = 25 A / T_j = 25 °C, AEC-Q101 qualification, and 175 °C junction rating - deployed in automotive load switching for 12 V/24 V systems including motors, lamps, and solenoids.

For engineers reviewing the BUK9629-100B datasheet, BUK9629-100B pinout, BUK9629-100B application, or BUK9629-100B equivalent, key selection criteria include logic-level gate drive compatibility (V_GS(th) = 1.1–2.0 V), thermal robustness (R_th(j-mb) = 0.95 K/W), avalanche energy rating (152 mJ), and automotive-grade reliability under thermally demanding conditions.

Technical Context

This device employs TrenchMOS technology to achieve low on-state resistance while maintaining stable threshold voltage across temperature (V_GS(th) = 0.5 V min at 175 °C). Its gate charge profile (Q_G(tot) = 33 nC, Q_GD = 13 nC) supports fast switching with controlled dV/dt in high-current automotive loads.

The integrated source-drain diode exhibits V_SD = 0.85–1.2 V at I_S = 25 A and T_j = 25 °C, with reverse recovery time t_rr = 114 ns and recovered charge Q_r = 196 nC - enabling reliable freewheeling in inductive switching applications without external diodes.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	100 V maximum - supports 42 V automotive systems with ≥2× safety margin against transients.
I_D (continuous)	46 A at T_mb = 25 °C - enables direct control of high-power 12 V/24 V loads like starter relays or HVAC blowers.
R_DS(on)	22–27 mΩ at V_GS = 10 V / I_D = 25 A / T_j = 25 °C - minimizes conduction loss and self-heating in sustained switching.
V_GS(th)	1.1–2.0 V typical - ensures full enhancement with standard 3.3 V or 5 V microcontroller GPIOs.
E_AS	152 mJ non-repetitive avalanche energy - withstands unclamped inductive kickback during fault events without failure.
R_th(j-mb)	0.95 K/W - enables efficient heat transfer to PCB copper or heatsink via exposed mounting base (drain-connected).
t_rr	114 ns - limits reverse recovery losses and EMI in PWM-driven motor/solenoid circuits.

Pinout & Package

Package: D2PAK (SOT404), plastic single-ended surface-mounted package with exposed metal mounting base electrically connected to drain. Dimensions per IEC JEDEC outline: 15.8 × 10.3 × 4.5 mm (L × W × H), with 3 leads (lead 2 cropped).

Pin/Terminal	Circuit Role	Design Meaning
1 (G)	Gate	Logic-level input controlling channel conduction; requires ≤2.0 V threshold for full turn-on with 3.3 V/5 V drivers.
2 (D)	Drain	Not externally accessible - internally connected to mounting base; primary high-side power path and thermal interface.
3 (S)	Source	Return path for load current; referenced to system ground in low-side switch configuration.
Mounting Base (mb)	Drain terminal / thermal pad	Electrically tied to drain; must be soldered to large copper area for thermal management and electrical integrity.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive critical applications including engine control, body electronics, and ADAS power stages.
175 °C junction rating	Enables operation in under-hood environments where ambient temperatures exceed 125 °C without derating.
Low R_DS(on) at 5 V drive	24–29 mΩ at V_GS = 5 V / I_D = 25 A / T_j = 25 °C - eliminates need for gate boosters in 5 V MCU systems.
Integrated avalanche ruggedness	152 mJ E_AS supports robustness against inductive energy spikes without external snubbers.
Optimized gate charge	Q_GD/Q_G(tot) ratio of ~39% balances switching speed and voltage overshoot in 24 V motor drives.

Applications

Automotive Body Control Module (BCM)

12 V Starter Relay Replacement

Use Scenario: Controlling headlamp, fog lamp, and interior lighting loads in modern BCMs with PWM dimming and diagnostics.

IC Role / Device Role / Timing Role: Low-side power switch handling up to 46 A peak loads with integrated current sensing feedback paths.

Use Value: Eliminates mechanical relay wear and bounce; enables precise duty-cycle control and real-time load monitoring via R_DS(on) sensing.

Use Scenario: Solid-state replacement for electromechanical starter relays in 12 V passenger vehicles.

IC Role / Device Role / Timing Role: High-current, high-reliability main power switch activated by ignition signal with soft-start sequencing.

Use Value: Withstands repeated cranking surges (186 A peak) and suppresses contact arcing; reduces system weight and acoustic noise.

42 V Mild Hybrid DC-DC Converter

Commercial Vehicle HVAC Blower Drive

Use Scenario: Synchronous rectification and high-side switching in bidirectional 42 V/14 V DC-DC converters for mild hybrid architectures.

IC Role / Device Role / Timing Role: Power MOSFET in synchronous buck/boost topology operating at 100 kHz with <100 ns switching transitions.

Use Value: Low Q_GD and C_oss minimize switching losses; 100 V rating accommodates 42 V bus transients up to 80 V.

Use Scenario: Speed-controlled blower motor driver in heavy-duty truck HVAC systems exposed to vibration and wide temperature swings.

IC Role / Device Role / Timing Role: PWM-driven low-side switch delivering 32 A continuous current at T_mb = 100 °C.

Use Value: 175 °C junction rating ensures uninterrupted operation at under-dash temperatures; AEC-Q101 compliance guarantees field longevity.

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
STL220N4LF8AG	40 V V_DS, 220 A I_D, TO-220FP package, R_DS(on) = 1.2 mΩ @ 10 V - lower voltage, higher current, larger footprint.	Targeted at 12 V battery systems only; unsuitable for 24 V/42 V automotive buses due to insufficient V_DS margin.	Select when ultra-low R_DS(on) and cost-sensitive 12 V designs outweigh package size constraints.
IRF1404ZPBF	40 V V_DS, 184 A I_D, TO-220AB package, R_DS(on) = 3.7 mΩ @ 10 V - no AEC-Q101 qualification, higher V_GS(th) (2–4 V).	Lacks automotive qualification and thermal derating data; not recommended for safety-critical or high-temperature deployments.	Acceptable for industrial 12 V non-automotive use where qualification and extended temperature range are not required.

Compared with STL220N4LF8AG and IRF1404ZPBF, BUK9629-100B uniquely combines 100 V rating, AEC-Q101 compliance, 175 °C operation, and logic-level gate drive - making it the only viable option for thermally constrained 24 V/42 V automotive power switching where reliability and transient immunity are mandatory.

Availability

BUK9629-100B is available at Aetrix Electronics and suitable for automotive body control modules, 12 V/24 V starter systems, and commercial vehicle HVAC blower drives requiring stable component supply across multi-year production cycles.

Supply support for BUK9629-100B 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 deep roots in automotive and industrial power management solutions.

BUK9629-100B belongs to Nexperia's TrenchMOS automotive logic-level FET product line, engineered specifically for robust, thermally efficient power switching in harsh automotive environments - from under-hood ECUs to chassis-mounted actuators.

FAQ

Is BUK9629-100B suitable for high-frequency PWM motor control?

Yes - with Q_GD = 13 nC and t_f = 46 ns, it supports PWM frequencies up to 200 kHz in brushed DC motor drives. Its low C_oss (236–283 pF) and optimized gate charge ratio reduce switching losses, but layout must minimize parasitic inductance given L_D = 2.5 nH (die-to-mounting-base) to avoid voltage overshoot.

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

The datasheet specifies I_D = 32 A continuous at T_mb = 100 °C and V_GS = 5 V. This derating reflects increased R_DS(on) (up to 75 mΩ at T_j = 175 °C), limiting power dissipation to ~77 W under those conditions - requiring adequate PCB copper area or heatsinking.

Can BUK9629-100B replace a mechanical relay in a 24 V automotive circuit?

Yes - its 100 V V_DS, 46 A I_D, and 152 mJ avalanche rating make it suitable for replacing 24 V relays in loads like fuel pumps or radiator fans. Unlike relays, it offers silent operation, no contact wear, and diagnostic capability via R_DS(on)-based current sensing.

Does the mounting base require electrical isolation from the PCB?

No - the mounting base is electrically connected to the drain terminal and must be soldered directly to a large copper pour or heatsink. Isolation would compromise both thermal performance (R_th(j-mb) = 0.95 K/W) and electrical integrity, as the drain path relies on this connection for current and heat conduction.

BUK9629-100B,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):: 100 V

Current - Continuous Drain (Id) @ 25°C:: 46A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 5V, 10V

Rds On (Max) @ Id, Vgs:: 27mOhm @ 25A, 10V

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

Gate Charge (Qg) (Max) @ Vgs:: 33 nC @ 5 V

Vgs (Max):: ±15V

Input Capacitance (Ciss) (Max) @ Vds:: 4360 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

BUK9629-100B,118 FAQ

1.How can I place an order for BUK9629-100B,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK9629-100B,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 BUK9629-100B,118 reliable?

The price and inventory of BUK9629-100B,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9629-100B,118 is usually 5 days.

3.What payment methods are accepted for BUK9629-100B,118?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK9629-100B,118 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK9629-100B,118?

BUK9629-100B,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK9629-100B,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 BUK9629-100B,118?

For technical support, including BUK9629-100B,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9629-100B,118 requirements.

6.How does Aetrix verify that BUK9629-100B,118 is sourced from the original manufacturer or authorized distributors?

All BUK9629-100B,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 BUK9629-100B,118 meets industry standards.

7.What is the process for return or replacement of BUK9629-100B,118?

All BUK9629-100B,118 units undergo pre-shipment inspection (PSI). If there is an issue with BUK9629-100B,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 BUK9629-100B,118 part is unused and in its original packaging.

Return procedure for BUK9629-100B,118:

1.Submit a request within 90 days.

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

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