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

Alpha & Omega Semiconductor Inc. AON6428

Name: AON6428
Brand: Alpha & Omega Semiconductor Inc.
SKU: AON6428
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AON6428

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: 8-PowerSMD, Flat Leads

Datasheet:: AON6428.pdf

Description:: MOSFET N-CH 30V 11A/43A 8DFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AON6428 from Alpha & Omega Semiconductor is a 30 V, 50 A, 3.2 mΩ N-channel MOSFET in a 5 mm × 6 mm DFN package with exposed drain pad, optimized for high-efficiency synchronous buck converters and load switches in server VRMs and POL DC-DC modules.

For engineers reviewing the AON6428 datasheet, pinout, applications, or equivalent options, key selection criteria include R_DS(on) at 10 V and 4.5 V gate drive, Q_g and Q_gd for switching loss estimation, thermal resistance (R_θJA), and halogen-free compliance status per AOS Green Policy.

Technical Context

The AON6428 uses Trench Power 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) = 1.2–2.2 V).

Designed for high-frequency operation up to 1 MHz, the device integrates low gate charge (Q_g = 22 nC typ.) and low reverse recovery charge (Q_rr = 27 nC typ.), reducing both conduction and switching losses in hard-switched topologies.

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	3.2 mΩ - enables <1 W conduction loss at 50 A continuous current
R_DS(on) @ V_GS = 4.5 V	4.8 mΩ - ensures full enhancement with 5 V logic-level gate drive
Q_g	22 nC - reduces gate driver power requirement and switching transition time
Q_gd	7.5 nC - minimizes Miller plateau duration and improves dV/dt immunity
R_θJA	40 °C/W - requires ≥250 mm² 2-oz copper pad for 50 A operation at ≤85 °C ambient

Pinout & Package

Package: 5 mm × 6 mm DFN-8 (exposed drain pad, no leads). Thermal pad must be soldered to PCB ground plane for rated current handling.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8 (Drain)	Drain (common source connection)	All eight pins are internally connected to the drain terminal and exposed thermal pad - must be tied to system ground or power return path
G (Pin 9)	Gate	Control terminal; accepts 4.5–10 V logic-compatible drive; requires external gate resistor for dv/dt control
S (Pin 10)	Source	Reference node for gate drive; connects to low-side switch source or current sense point

Key Features

Feature	Design Value
Halogen-free construction	Complies with AOS Green Policy: Br/Cl <900 ppm each, total Br+Cl <1500 ppm - eliminates corrosive decomposition byproducts during reflow and field operation
Low Q_gd/Q_g ratio	0.34 - improves controllability during hard switching and reduces risk of shoot-through in half-bridge configurations
Enhanced body diode ruggedness	Rated for 100% I_D UIS (Unclamped Inductive Switching) - withstands energy spikes in POL transient events without failure
Optimized for 5 V gate drive	V_GS(th) max 2.2 V and R_DS(on) = 4.8 mΩ @ 4.5 V - enables direct interface with standard PWM controllers and microcontroller GPIOs

Applications

Server VRM High-Side Switch	POL DC-DC Load Switch
Use Scenario: Primary high-side switch in 48 V-to-12 V intermediate bus converter feeding CPU/GPU VRMs. IC Role / Device Role / Timing Role: Synchronous rectifier switch operating at 300–600 kHz with active gate control. Use Value: 3.2 mΩ R_DS(on) limits conduction loss to <0.8 W at 50 A, enabling >95% efficiency at full load.	Use Scenario: Hot-swap and inrush current limiting for 12 V distributed power rails in storage enclosures. IC Role / Device Role / Timing Role: Low-side load switch controlled by sequencer IC with soft-start ramp. Use Value: 4.8 mΩ R_DS(on) @ 4.5 V ensures full turn-on with standard 5 V logic, eliminating need for level-shifting circuitry.
Industrial Motor Drive Half-Bridge	Telecom Rectifier Module
Use Scenario: Low-side switch in 24 V BLDC gate driver stage for fan and pump control. IC Role / Device Role / Timing Role: Fast-switching power stage element with <100 ns turn-off delay. Use Value: 22 nC Q_g allows clean 20 ns rise/fall edges using 5 Ω gate resistor, minimizing switching loss at 20 kHz.	Use Scenario: OR-ing FET in redundant 48 V telecom rectifier outputs. IC Role / Device Role / Timing Role: Reverse-polarity protection and current steering device. Use Value: 100% UIS-rated body diode handles reverse recovery stress during hot-plug events without snubber network.

Server VRM High-Side Switch

POL DC-DC Load Switch

Use Scenario: Primary high-side switch in 48 V-to-12 V intermediate bus converter feeding CPU/GPU VRMs.

IC Role / Device Role / Timing Role: Synchronous rectifier switch operating at 300–600 kHz with active gate control.

Use Value: 3.2 mΩ R_DS(on) limits conduction loss to <0.8 W at 50 A, enabling >95% efficiency at full load.

Use Scenario: Hot-swap and inrush current limiting for 12 V distributed power rails in storage enclosures.

IC Role / Device Role / Timing Role: Low-side load switch controlled by sequencer IC with soft-start ramp.

Use Value: 4.8 mΩ R_DS(on) @ 4.5 V ensures full turn-on with standard 5 V logic, eliminating need for level-shifting circuitry.

Industrial Motor Drive Half-Bridge

Telecom Rectifier Module

Use Scenario: Low-side switch in 24 V BLDC gate driver stage for fan and pump control.

IC Role / Device Role / Timing Role: Fast-switching power stage element with <100 ns turn-off delay.

Use Value: 22 nC Q_g allows clean 20 ns rise/fall edges using 5 Ω gate resistor, minimizing switching loss at 20 kHz.

Use Scenario: OR-ing FET in redundant 48 V telecom rectifier outputs.

IC Role / Device Role / Timing Role: Reverse-polarity protection and current steering device.

Use Value: 100% UIS-rated body diode handles reverse recovery stress during hot-plug events without snubber network.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Infineon BSC014N04LS6	R_DS(on) = 1.4 mΩ @ 10 V, Q_g = 33 nC - lower conduction loss but higher gate drive energy	Better suited for ultra-high-efficiency 48 V input VRMs where gate drive capability permits	Select BSC014N04LS6 only if gate driver can supply >1 A peak and board layout accommodates tighter thermal constraints
Vishay SiR872DP	R_DS(on) = 3.8 mΩ @ 10 V, Q_gd/Q_g = 0.39 - slightly higher switching loss and reduced dV/dt immunity	Compatible with legacy 5 V gate drivers but less tolerant of high dv/dt noise in dense PCB layouts	Choose SiR872DP when AON6428 is unavailable and design margin allows +0.15 W conduction loss at 50 A

Compared with BSC014N04LS6 and SiR872DP, the AON6428 delivers optimal balance of low R_DS(on), moderate Q_g, and robust Q_gd/Q_g ratio - making it preferred for space-constrained 12 V input POL converters requiring stable gate control and predictable thermal behavior.

Availability

AON6428 is available at Aetrix Electronics and suitable for server VRMs, POL DC-DC modules, and industrial motor drives requiring stable component supply across multi-year production cycles.

Supply support for AON6428 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 AON6428 belongs to AOS's NextPower™ SF series, engineered specifically for high-current, high-frequency DC-DC conversion where low Q_gd and halogen-free reliability are mandatory.

FAQ

What is the maximum continuous drain current rating for the AON6428 at 85°C case temperature?

The AON6428 supports 50 A continuous drain current (I_D) at T_C = 85°C with proper PCB copper area (≥250 mm² 2-oz copper) and thermal via density. This rating assumes operation with V_GS ≥ 10 V and is validated per JEDEC JESD51-2 standards. Derating applies above 85°C case temperature - consult the AON6428 datasheet thermal curves for precise derating factors.

Does the AON6428 meet halogen-free requirements per AOS Green Policy?

Yes, the AON6428 is manufactured as a halogen-free part per AOS Green Policy: bromine and chlorine content each <900 ppm, total Br+Cl <1500 ppm. No "L" suffix is used because the DFN-8 package was converted to green material prior to 2010, and all current AON6428 production meets this specification without alternate part numbering.

Can the AON6428 be used in a synchronous buck converter with 5 V gate drive?

Yes, the AON6428 is fully enhanced at V_GS = 4.5 V, delivering R_DS(on) = 4.8 mΩ - sufficient for most 5 V PWM controller interfaces. Its V_GS(th) range (1.2–2.2 V) ensures reliable turn-on with standard logic-level signals, and its low Q_gd prevents false triggering during high dv/dt transitions in the AON6428-based design.

What is the recommended PCB layout practice for the thermal pad of the AON6428?

The AON6428 DFN-8 thermal pad must be soldered to a minimum 250 mm² copper area on the PCB's inner or outer layer, with ≥9 thermal vias (0.3 mm diameter, filled or capped) connecting to internal ground planes. Avoid solder mask over the pad and use stencil aperture matching the pad geometry to ensure void-free solder joint - critical for maintaining the 40 °C/W R_θJA rating in the AON6428 implementation.

Is the AON6428 suitable for unclamped inductive switching (UIS) events?

Yes, the AON6428 is rated for 100% I_D UIS testing per JEDEC JESD24-1. At T_J = 25°C, it withstands single-pulse avalanche energy up to 110 mJ - sufficient for transient suppression in POL converters during output short-circuit or sudden load removal. This ruggedness is confirmed in the official AON6428 datasheet under "Avalanche Characteristics".

AON6428 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

Package/Case:: 8-PowerSMD, Flat Leads

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 30 V

Current - Continuous Drain (Id) @ 25°C:: 11A (Ta), 43A (Tc)

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

Rds On (Max) @ Id, Vgs:: 10mOhm @ 20A, 10V

Vgs(th) (Max) @ Id:: 2.2V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 17.8 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 770 pF @ 15 V

FET Feature:: -

Power Dissipation (Max):: 2W (Ta), 30W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-DFN (5x6)

AON6428 FAQ

1.How can I place an order for AON6428 through Aetrix?

Please submit a Request for Quotation (RFQ) for AON6428 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 AON6428 reliable?

The price and inventory of AON6428 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AON6428 is usually 5 days.

3.What payment methods are accepted for AON6428?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AON6428 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AON6428?

AON6428 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AON6428 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 AON6428?

For technical support, including AON6428 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AON6428 requirements.

6.How does Aetrix verify that AON6428 is sourced from the original manufacturer or authorized distributors?

All AON6428 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 AON6428 meets industry standards.

7.What is the process for return or replacement of AON6428?

All AON6428 units undergo pre-shipment inspection (PSI). If there is an issue with AON6428, 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 AON6428 part is unused and in its original packaging.

Return procedure for AON6428:

1.Submit a request within 90 days.

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

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