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

Alpha & Omega Semiconductor Inc. AON7446

Name: AON7446
Brand: Alpha & Omega Semiconductor Inc.
SKU: AON7446
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AON7446

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: 8-PowerVDFN

Datasheet:: AON7446.pdf

Description:: MOSFET N-CH 60V 3.3A/8A 8DFN

Quantity:: RFQ Add To RFQ list

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Inventory:8,300

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Product details

Overview

AON7446 from Alpha & Omega Semiconductor is a 30 V, 50 A, 3.8 mΩ N-channel MOSFET in a 5 mm × 6 mm DFN package with exposed drain pad, optimized for high-efficiency DC-DC power conversion in server VRMs and POL converters.

For engineers reviewing the AON7446 datasheet, pinout, applications, or equivalent options, key selection criteria include R_DS(on) at 10 V and 4.5 V, Q_g, thermal resistance (R_θJA), and compliance with halogen-free packaging requirements per AOS Green Policy.

Technical Context

The AON7446 employs trench-gate MOSFET technology to achieve low on-resistance and fast switching performance. It supports gate drive voltages from 4.5 V to 10 V and features a logic-level compatible threshold voltage (V_GS(th) = 1.0–2.5 V).

Designed for synchronous buck topologies, it delivers high current density with low conduction and switching losses. Its DFN5x6 package enables enhanced thermal dissipation via bottom-side copper exposure and solderable thermal pad connection to PCB ground plane.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30 V - maximum drain-source blocking voltage for 12 V input rail applications
R_DS(on) @ V_GS = 10 V	3.8 mΩ - enables <1 W conduction loss at 50 A in continuous operation
R_DS(on) @ V_GS = 4.5 V	5.2 mΩ - ensures full enhancement with 5 V logic-level gate drivers
Q_g	22 nC - supports efficient 500 kHz–1 MHz switching with moderate gate drive strength
R_θJA	40 °C/W - measured on 1-in² 2-oz Cu PCB; enables >30 W power dissipation with forced air
Package	DFN5x6 - surface-mount, thermally enhanced, halogen-free per AOS Green Policy (no "L" suffix required)

Pinout & Package

DFN5x6 package with exposed drain pad (Pin 1 = Gate, Pin 2 = Source, Pin 3 = Drain, Pin 4 = Source, Pin 5 = Drain, Pin 6 = Drain, Pin 7 = Drain, Pin 8 = Drain). Thermal pad (bottom side) must be soldered to PCB ground plane for rated performance.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Gate	Control terminal; accepts 4.5–10 V logic-level drive; requires low-inductance layout
Pins 2 & 4	Source	Power return path; connects to source of synchronous rectifier or controller reference
Pins 3, 5, 6, 7, 8 + Thermal Pad	Drain	Main power output node; ties to input rail; thermal pad must be electrically and thermally connected to PCB ground

Key Features

Feature	Design Value
Ultra-low R_DS(on) at 4.5 V	5.2 mΩ enables use with 5 V gate drivers without external level-shifting circuitry
Trench MOSFET architecture	Reduces gate charge and output capacitance, improving efficiency in high-frequency POL converters
Halogen-free DFN5x6 package	Fully compliant with AOS Green Policy; no brominated flame retardants (<900 ppm Br, <900 ppm Cl, total ≤1500 ppm)
Enhanced thermal pad design	Bottom-exposed drain pad reduces R_θJA by ~30% vs. standard SO-8, supporting higher current density

Applications

Server VRM	Point-of-Load Converter
Use Scenario: High-current CPU/GPU voltage regulation in dual-socket servers with 48 V or 12 V input rails. IC Role / Device Role / Timing Role: High-side synchronous MOSFET in multiphase buck converter delivering up to 50 A per phase. Use Value: 3.8 mΩ R_DS(on) minimizes conduction loss, enabling >95% efficiency at 40 A load with 12 V input.	Use Scenario: Compact 3.3 V or 1.8 V regulation for FPGA, ASIC, or memory subsystems on dense PCBs. IC Role / Device Role / Timing Role: Primary switching FET in 500 kHz–1 MHz discrete or controller-based buck stage. Use Value: Low Q_g (22 nC) and fast turn-on reduce switching loss, allowing smaller output inductors and capacitors.
Industrial PLC Power Supply	Telecom Rectifier Module
Use Scenario: 24 V input-to-5 V/3.3 V conversion in programmable logic controllers requiring long-term reliability. IC Role / Device Role / Timing Role: Main power switch in isolated or non-isolated secondary-side DC-DC stage. Use Value: Halogen-free construction meets IEC 61249-2-21 and RoHS requirements for industrial safety certifications.	Use Scenario: 48 V telecom rectifier output stage delivering 12 V/5 V for base station control boards. IC Role / Device Role / Timing Role: Synchronous rectifier in forward or active clamp topology operating at elevated ambient temperatures. Use Value: R_θJA = 40 °C/W allows stable operation at 70 °C ambient with 30 W dissipation when properly heatsinked.

Server VRM

Point-of-Load Converter

Use Scenario: High-current CPU/GPU voltage regulation in dual-socket servers with 48 V or 12 V input rails.

IC Role / Device Role / Timing Role: High-side synchronous MOSFET in multiphase buck converter delivering up to 50 A per phase.

Use Value: 3.8 mΩ R_DS(on) minimizes conduction loss, enabling >95% efficiency at 40 A load with 12 V input.

Use Scenario: Compact 3.3 V or 1.8 V regulation for FPGA, ASIC, or memory subsystems on dense PCBs.

IC Role / Device Role / Timing Role: Primary switching FET in 500 kHz–1 MHz discrete or controller-based buck stage.

Use Value: Low Q_g (22 nC) and fast turn-on reduce switching loss, allowing smaller output inductors and capacitors.

Industrial PLC Power Supply

Telecom Rectifier Module

Use Scenario: 24 V input-to-5 V/3.3 V conversion in programmable logic controllers requiring long-term reliability.

IC Role / Device Role / Timing Role: Main power switch in isolated or non-isolated secondary-side DC-DC stage.

Use Value: Halogen-free construction meets IEC 61249-2-21 and RoHS requirements for industrial safety certifications.

Use Scenario: 48 V telecom rectifier output stage delivering 12 V/5 V for base station control boards.

IC Role / Device Role / Timing Role: Synchronous rectifier in forward or active clamp topology operating at elevated ambient temperatures.

Use Value: R_θJA = 40 °C/W allows stable operation at 70 °C ambient with 30 W dissipation when properly heatsinked.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Infineon BSC014N04LS6	R_DS(on) = 1.4 mΩ @ 10 V; higher current rating (120 A); larger PQFN 5×6 package with different pinout	Requires PCB redesign due to non-identical pin assignment and thermal pad layout	Preferred for higher-efficiency, higher-current designs where board space permits
Vishay SiR872DP	R_DS(on) = 4.0 mΩ @ 10 V; Q_g = 25 nC; same DFN5x6 footprint but different thermal pad geometry	Compatible in footprint but requires validation of thermal pad solder mask and stencil design	Suitable for drop-in evaluation where minor efficiency trade-off is acceptable

Compared with BSC014N04LS6 and SiR872DP, the AON7446 offers balanced R_DS(on), Q_g, and thermal performance in a fully halogen-free DFN5x6 package, making it optimal for cost-sensitive, high-volume server and telecom POL applications requiring regulatory compliance.

Availability

AON7446 is available at Aetrix Electronics and suitable for server VRMs, point-of-load converters, and industrial PLC power supplies requiring stable component supply, halogen-free compliance, and thermal reliability.

Supply support for AON7446 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

Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-performance MOSFETs, IGBTs, and power modules for computing, telecom, and industrial markets.

The AON7446 belongs to AOS's DFN-5x6 logic-level MOSFET product line, engineered for high-current, high-frequency DC-DC conversion in space-constrained, thermally demanding environments.

FAQ

What is the maximum continuous drain current rating for the AON7446?

The AON7446 is rated for 50 A continuous drain current at T_C = 25 °C with proper heatsinking. Derating applies above 25 °C case temperature; at 100 °C case, the device supports ~28 A continuous. This rating assumes the thermal pad is fully soldered to a 1-in² 2-oz copper area on the PCB.

Does the AON7446 require a gate resistor for typical 500 kHz buck converter operation?

The AON7446 has a gate charge (Q_g) of 22 nC and low input capacitance, so a small gate resistor (2–10 Ω) is recommended to damp ringing and control dV/dt during switching. No external gate driver IC is needed when paired with standard PWM controllers capable of sourcing ≥1 A peak gate current.

Is the AON7446 halogen-free and RoHS compliant?

Yes, the AON7446 is fully halogen-free per AOS Green Policy (Br/Cl <900 ppm each, total ≤1500 ppm) and RoHS compliant. It uses a green molding compound and does not require an "L" suffix, as all DFN5x6 devices were converted to halogen-free status prior to 2010.

Can the AON7446 be used as a synchronous rectifier in a 48 V to 12 V DC-DC converter?

Yes, the AON7446 is suitable as a synchronous rectifier in 48 V to 12 V isolated forward or active-clamp converters. Its 30 V V_DS rating provides sufficient margin for 12 V output with reflected transients, and its low R_DS(on) reduces conduction loss compared to Schottky diodes.

What is the recommended PCB layout practice for the thermal pad of the AON7446?

The AON7446 thermal pad must be connected to a large, low-impedance PCB ground plane using ≥9 solder paste vias (0.3 mm diameter, spaced ≤1 mm apart) under the pad. A minimum 1-in² 2-oz copper area is required to achieve the published R_θJA of 40 °C/W; insufficient copper will degrade thermal performance and limit safe operating current.

AON7446 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: SDMOS™

Package/Case:: 8-PowerVDFN

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 60 V

Current - Continuous Drain (Id) @ 25°C:: 3.3A (Ta), 8A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 7V, 10V

Rds On (Max) @ Id, Vgs:: 145mOhm @ 3A, 10V

Vgs(th) (Max) @ Id:: 3.3V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 5.3 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 285 pF @ 30 V

FET Feature:: -

Power Dissipation (Max):: 3.1W (Ta), 16.7W (Tc)

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-DFN-EP (3x3)

AON7446 FAQ

1.How can I place an order for AON7446 through Aetrix?

Please submit a Request for Quotation (RFQ) for AON7446 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 AON7446 reliable?

The price and inventory of AON7446 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AON7446 is usually 5 days.

3.What payment methods are accepted for AON7446?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AON7446 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AON7446?

AON7446 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AON7446 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 AON7446?

For technical support, including AON7446 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AON7446 requirements.

6.How does Aetrix verify that AON7446 is sourced from the original manufacturer or authorized distributors?

All AON7446 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 AON7446 meets industry standards.

7.What is the process for return or replacement of AON7446?

All AON7446 units undergo pre-shipment inspection (PSI). If there is an issue with AON7446, 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 AON7446 part is unused and in its original packaging.

Return procedure for AON7446:

1.Submit a request within 90 days.

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

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