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

Nexperia USA Inc. BUK4D16-20X

Name: BUK4D16-20X
Brand: Nexperia USA Inc.
SKU: BUK4D16-20X
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK4D16-20X

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: 6-UDFN Exposed Pad

Datasheet:: BUK4D16-20X.pdf

Description:: SMALL SIGNAL MOSFET FOR AUTOMOTI

Quantity:: RFQ Add To RFQ list

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Inventory:5,421

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Product details

Overview

BUK4D16-20X from Nexperia is a 20 V, N-channel Trench MOSFET in DFN2020MD-6 (SOT1220) package, designed for low-side load switching and DC-DC conversion with R_DS(on) = 13 mΩ at V_GS = 4.5 V, I_D = 8.5 A, T_j = 25 °C, 175 °C maximum junction temperature, and AEC-Q101 qualification for automotive use.

For engineers reviewing the BUK4D16-20X datasheet, BUK4D16-20X pinout, BUK4D16-20X application, or BUK4D16-20X equivalent, this page delivers verified electrical parameters, thermal performance data, side-wettable flank packaging details, and validated automotive-grade substitution options - all critical for high-reliability power stage design and PCB layout validation.

Technical Context

This MOSFET employs Trench technology to achieve low on-resistance and fast switching (t_d(on) = 4 ns, t_f = 9 ns), optimized for high-efficiency, high-frequency operation in compact power converters. Its gate threshold voltage (V_GS(th) = 0.6–1.3 V) enables robust 3.3 V logic-level drive compatibility.

The device integrates an intrinsic body diode with V_SD = 0.7–1.2 V at I_S = 2 A and t_rr = 10 ns, supporting synchronous rectification and freewheeling in buck topologies. Thermal resistance R_th(j-sp) = 4–8 K/W ensures efficient heat transfer to the PCB solder point under continuous 26 A drain current conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	20 V - Maximum blocking voltage compatible with 12 V automotive systems and 5–19 V input DC-DC stages
R_DS(on)	13 mΩ @ V_GS = 4.5 V, I_D = 8.5 A, T_j = 25 °C - Enables <100 mW conduction loss at 8.5 A, reducing thermal stress
I_D	26 A @ V_GS = 4.5 V, T_sp = 25 °C - Supports high-current load switching without external heatsinking on standard FR4
P_tot	19 W @ T_sp = 25 °C - Delivers >2× power density vs. comparable SO-8 MOSFETs in same thermal footprint
Q_G(tot)	9.8–15 nC - Low gate charge enables fast turn-on with minimal driver IC power consumption
T_j(max)	175 °C - Rated for under-hood automotive environments and industrial motor control hotspots
ESD Rating	>2 kV HBM (Class H2) - Robust handling during SMT assembly and board-level testing

Pinout & Package

DFN2020MD-6 (SOT1220) is a 2 mm × 2 mm × 0.65 mm leadless thermal-enhanced ultra-thin package with side-wettable flanks for automated optical solder inspection and improved thermal dissipation via exposed drain pad.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 5, 6, 7	Drain (D)	Five parallel drain terminals connected to internal die drain metallization and exposed thermal pad - primary current path and thermal conduction path to PCB
3	Gate (G)	Single gate input terminal - requires controlled slew rate drive to minimize EMI and prevent shoot-through in half-bridge configurations
4, 8	Source (S)	Two source terminals providing low-inductance return path for gate and power loops - critical for stable high-speed switching

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive powertrain and body electronics per stress test requirements - eliminates need for additional qualification effort
Side-wettable flanks	Enables 100% automated optical inspection (AOI) of solder joint quality on all six terminals - improves manufacturing yield and field reliability
Trench MOSFET architecture	Delivers 30% lower R_DS(on) vs. planar equivalents at same voltage rating - reduces conduction losses in space-constrained designs
Extended T_j range	Operates continuously up to 175 °C junction temperature - supports placement near heat sources without derating penalties
Low Q_GD/Q_G ratio	Q_GD = 2.9 nC of total Q_G(tot) = 9.8–15 nC - enhances Miller immunity and enables stable operation at >1 MHz switching frequencies

Applications

Automotive Body Control Module (BCM)

USB-C Power Delivery Switch

Use Scenario: Controlling 12 V lighting, solenoids, and fan motors in vehicle door modules and central junction boxes.

IC Role / Device Role / Timing Role: Low-side load switch managing up to 26 A peak loads with PWM dimming capability and short-circuit protection.

Use Value: AEC-Q101 qualification and 175 °C T_j(max) ensure compliance with ISO 16750-4 transient and thermal cycling requirements.

Use Scenario: Enabling/disabling 20 V/5 A USB PD power paths in portable docking stations and multi-port chargers.

IC Role / Device Role / Timing Role: High-speed, low-loss power switch with <9 ns fall time and 13 mΩ R_DS(on) minimizing voltage drop across the switch.

Use Value: Side-wettable flanks allow full AOI coverage on dense USB-C PCBs, eliminating manual visual inspection.

Industrial DC-DC Converter

High-Speed Line Driver

Use Scenario: Synchronous rectifier in 5–12 V input, 3.3 V/15 A output buck converter for PLC I/O modules.

IC Role / Device Role / Timing Role: Secondary-side power switch operating at 500 kHz–1 MHz with low Q_G and fast t_f = 9 ns.

Use Value: R_th(j-sp) = 4–8 K/W enables direct thermal coupling to PCB copper, replacing discrete thermal vias and heatsinks.

Use Scenario: Driving 50 Ω transmission lines in industrial fieldbus interfaces (e.g., RS-485 repeaters, CAN FD nodes).

IC Role / Device Role / Timing Role: Fast-switching buffer amplifier delivering 26 A pulsed current into capacitive line loads.

Use Value: 4 ns turn-on delay and 7 ns rise time support >100 Mbps signal integrity without overshoot or ringing.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel trench MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor NTMFS4C09NT1G	20 V, R_DS(on) = 11.5 mΩ @ 4.5 V, but larger 3.3 mm × 3.3 mm SO-8FL package and no side-wettable flanks	Lacks AOI support and has higher thermal resistance (R_th(j-a) = 50 K/W vs. 66–76 K/W), limiting high-density layouts	Select when higher current margin is needed and PCB area allows larger footprint
Infineon BSC014N04LS6	40 V rating, R_DS(on) = 1.4 mΩ @ 4.5 V, but not AEC-Q101 qualified and uses PG-TSDSON-8 package	Over-specified voltage rating increases cost and gate charge (Q_G = 25 nC), reducing efficiency in 20 V systems	Select only if future-proofing for 36 V transients is required and automotive qualification is waived

Compared with NTMFS4C09NT1G and BSC014N04LS6, BUK4D16-20X uniquely balances AEC-Q101 compliance, side-wettable flanks for manufacturability, and optimal 20 V/13 mΩ performance in a 2 mm × 2 mm footprint - making it the preferred choice for space-constrained automotive and industrial power switches.

Availability

BUK4D16-20X is available at Aetrix Electronics and suitable for automotive body control modules, USB-C power delivery systems, industrial DC-DC converters, and high-speed line drivers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for BUK4D16-20X 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-performance, high-reliability discrete and logic devices, with leadership in automotive-qualified MOSFETs and ESD-protected components.

The BUK4D16-20X belongs to Nexperia's TrenchMOS automotive power portfolio, engineered specifically for low-voltage, high-current switching in harsh-environment applications where thermal robustness, AOI compatibility, and AEC-Q101 compliance are mandatory.

FAQ

What is the maximum continuous drain current for BUK4D16-20X at 100 °C solder point temperature?

At T_sp = 100 °C, the normalized continuous drain current is 65% of the 25 °C rating (26 A), yielding 16.9 A. This value is derived from Figure 2 in the datasheet and accounts for thermal derating due to reduced heat transfer efficiency at elevated PCB temperatures.

Does BUK4D16-20X support 3.3 V logic-level gate drive?

Yes - its gate threshold voltage (V_GS(th)) ranges from 0.6 V to 1.3 V at T_j = 25 °C, and R_DS(on) remains ≤16 mΩ even at V_GS = 3.3 V (per Fig. 9). Full 26 A conduction is achievable with 4.5 V drive, but 3.3 V is sufficient for most low-power switching applications.

How does the side-wettable flank feature improve manufacturing yield?

The side-wettable flanks on pins 1–8 enable automated optical inspection (AOI) of solder fillet formation on all six terminals - unlike standard DFN packages where only top-surface alignment can be verified. This detects insufficient solder, bridging, and misalignment before functional test, reducing field failures by >40% in high-volume automotive assembly.

Is the body diode in BUK4D16-20X suitable for synchronous rectification?

Yes - the integrated source-drain diode has t_rr = 10 ns and Q_r = 3 nC, enabling efficient synchronous rectification in buck converters up to 1 MHz. Its V_SD = 0.7–1.2 V at I_S = 2 A ensures low forward loss, and the fast recovery minimizes reverse recovery losses during dead-time transitions.

BUK4D16-20X Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: TrenchMOS™

Package/Case:: 6-UDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 20 V

Current - Continuous Drain (Id) @ 25°C:: 8.5A (Ta), 26A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 2.5V, 8V

Rds On (Max) @ Id, Vgs:: 14mOhm @ 9A, 8V

Vgs(th) (Max) @ Id:: 1.3V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 15 nC @ 4.5 V

Vgs (Max):: ±12V

Input Capacitance (Ciss) (Max) @ Vds:: 931 pF @ 10 V

FET Feature:: -

Power Dissipation (Max):: 2W (Ta), 19W (Tc)

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DFN2020MD-6

BUK4D16-20X FAQ

1.How can I place an order for BUK4D16-20X through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK4D16-20X 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 BUK4D16-20X reliable?

The price and inventory of BUK4D16-20X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK4D16-20X is usually 5 days.

3.What payment methods are accepted for BUK4D16-20X?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK4D16-20X transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK4D16-20X?

BUK4D16-20X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK4D16-20X 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 BUK4D16-20X?

For technical support, including BUK4D16-20X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK4D16-20X requirements.

6.How does Aetrix verify that BUK4D16-20X is sourced from the original manufacturer or authorized distributors?

All BUK4D16-20X 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 BUK4D16-20X meets industry standards.

7.What is the process for return or replacement of BUK4D16-20X?

All BUK4D16-20X units undergo pre-shipment inspection (PSI). If there is an issue with BUK4D16-20X, 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 BUK4D16-20X part is unused and in its original packaging.

Return procedure for BUK4D16-20X:

1.Submit a request within 90 days.

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

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