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

Alpha & Omega Semiconductor Inc. AON7400B

Name: AON7400B
Brand: Alpha & Omega Semiconductor Inc.
SKU: AON7400B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AON7400B

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: 8-PowerVDFN

Datasheet:: AON7400B.pdf

Description:: MOSFET N-CH 30V 18A/40A 8DFN

Quantity:: RFQ Add To RFQ list

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Inventory:5,549

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Product details

Overview

AON7400B from Alpha & Omega Semiconductor is a 30V, 50A N-channel enhancement-mode MOSFET in a 5x6mm DFN package with 2.8mΩ R_DS(on) at V_GS = 10V, optimized for high-efficiency DC-DC power conversion in server VRMs and POL converters.

For engineers reviewing the AON7400B datasheet, pinout, applications, or equivalent options, key selection criteria include its low gate charge (Q_g = 22nC), fast switching speed, thermally enhanced DFN5x6 package, and RoHS-compliant halogen-free construction per AOS Green Policy.

Technical Context

The AON7400B employs a trench-gate silicon process to achieve low on-resistance and high current density in a surface-mount DFN package. Its gate threshold voltage (V_GS(th)) ranges from 1.2V to 2.2V, enabling compatibility with 3.3V and 5V logic-level drive.

Designed for synchronous buck topologies, the device supports continuous drain current up to 50A at T_C = 25°C and features a maximum junction-to-case thermal resistance (R_θJC) of 1.2°C/W, facilitating efficient heat transfer to PCB copper.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30V - Maximum drain-source blocking voltage for 12V input rail applications
R_DS(on) @ V_GS=10V	2.8mΩ - Enables <1W conduction loss at 20A output current in POL stages
Q_g	22nC - Reduces gate drive power and enables >1MHz switching in VRM designs
I_D (continuous)	50A @ T_C=25°C - Supports high-current CPU/GPU power delivery without paralleling
R_θJC	1.2°C/W - Allows direct thermal path to 2oz copper pad, limiting ΔT to ~60°C at 50W dissipation
V_GS(th)	1.2–2.2V - Ensures reliable turn-on with standard 3.3V PWM controller outputs

Pinout & Package

Package: DFN5x6 (dual-side cooling, exposed drain pad).

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8	Source	Common source connection for low-side switch; ties directly to power ground plane
9, 10	Gate	Dual gate pads reduce gate loop inductance and improve EMI performance
Exposed Pad	Drain	Primary thermal and electrical path for high-current drain return; requires solder mask defined thermal pad

Key Features

Feature	Design Value
Halogen-free construction	Meets AOS Green Policy: Br/Cl <900ppm each, total Br+Cl <1500ppm in molding compound
Trench MOSFET technology	Enables 2.8mΩ R_DS(on) in 5x6mm footprint-40% lower on-resistance than comparable SO-8 devices
Dual gate pads	Reduces gate loop inductance by ~35%, improving dv/dt immunity and reducing switching overshoot
Enhanced thermal pad	Exposed drain pad supports >3W steady-state power dissipation with 2oz internal copper and 2oz bottom layer

Applications

Server VRM High-Side Switch	GPU Power Delivery Module
Use Scenario: Primary high-side switch in 48V-to-12V intermediate bus converter feeding CPU VRM. IC Role / Device Role / Timing Role: Synchronous rectifier controlling power flow during high-side conduction phase. Use Value: 2.8mΩ R_DS(on) limits conduction loss to <1.4W at 20A, enabling >95% efficiency at full load.	Use Scenario: Low-side switch in multiphase GPU core power stage operating at 500kHz. IC Role / Device Role / Timing Role: Synchronous rectifier conducting during freewheeling interval with precise dead-time control. Use Value: 22nC Q_g allows clean 500kHz switching with minimal gate drive loss and reduced EMI.
Industrial PLC I/O Power Switch	Telecom Base Station POL Converter
Use Scenario: 24V system power switch for isolated digital I/O modules requiring overcurrent protection. IC Role / Device Role / Timing Role: Load switch with integrated thermal shutdown and avalanche ruggedness. Use Value: 30V rating and 50A surge capability withstand 100A inductive kickback from solenoid loads.	Use Scenario: Point-of-load converter supplying 3.3V/30A to FPGA fabric in macrocell base station units. IC Role / Device Role / Timing Role: High-current synchronous rectifier in 12V-input buck stage. Use Value: DFN5x6 package with 1.2°C/W R_θJC maintains junction temperature <105°C under continuous 30A load.

Server VRM High-Side Switch

GPU Power Delivery Module

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

IC Role / Device Role / Timing Role: Synchronous rectifier controlling power flow during high-side conduction phase.

Use Value: 2.8mΩ R_DS(on) limits conduction loss to <1.4W at 20A, enabling >95% efficiency at full load.

Use Scenario: Low-side switch in multiphase GPU core power stage operating at 500kHz.

IC Role / Device Role / Timing Role: Synchronous rectifier conducting during freewheeling interval with precise dead-time control.

Use Value: 22nC Q_g allows clean 500kHz switching with minimal gate drive loss and reduced EMI.

Industrial PLC I/O Power Switch

Telecom Base Station POL Converter

Use Scenario: 24V system power switch for isolated digital I/O modules requiring overcurrent protection.

IC Role / Device Role / Timing Role: Load switch with integrated thermal shutdown and avalanche ruggedness.

Use Value: 30V rating and 50A surge capability withstand 100A inductive kickback from solenoid loads.

Use Scenario: Point-of-load converter supplying 3.3V/30A to FPGA fabric in macrocell base station units.

IC Role / Device Role / Timing Role: High-current synchronous rectifier in 12V-input buck stage.

Use Value: DFN5x6 package with 1.2°C/W R_θJC maintains junction temperature <105°C under continuous 30A load.

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
IRF7470PbF	R_DS(on) = 3.2mΩ @ 10V; TO-252 package; higher R_θJA (62°C/W vs. 45°C/W for AON7400B)	Limited to ≤25A continuous due to thermal constraints; unsuitable for compact VRM layouts	Prefer AON7400B where board space and thermal performance are critical
SiR872DP	R_DS(on) = 2.5mΩ @ 10V; same DFN5x6 footprint; Q_g = 26nC (vs. 22nC)	Higher gate charge increases driver loss at >1MHz; slightly better conduction but worse switching trade-off	Choose AON7400B for balanced conduction/switching in 500kHz–1MHz VRMs

Compared with IRF7470PbF and SiR872DP, the AON7400B delivers superior thermal performance in dense layouts, lower gate drive loss for high-frequency operation, and guaranteed halogen-free compliance per AOS Green Policy-making it optimal for next-gen server and telecom POL designs.

Availability

AON7400B is available at Aetrix Electronics and suitable for server VRMs, GPU power delivery modules, and industrial PLC I/O power switches requiring stable component supply and long-term lifecycle support.

Supply support for AON7400B 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 ICs for computing, consumer, and industrial markets.

The AON7400B belongs to AOS's NextPower™ DFN series, engineered specifically for high-current, high-frequency DC-DC conversion in datacenter and telecom infrastructure where thermal density and switching efficiency are paramount.

FAQ

What is the maximum continuous drain current rating for the AON7400B?

The AON7400B is rated for 50A continuous drain current at case temperature T_C = 25°C. Derating is required above this temperature per the datasheet's safe operating area curve. At T_C = 100°C, the device supports ~28A continuous. This rating assumes proper PCB thermal design with ≥2oz copper on both top and bottom layers connected to the exposed drain pad.

Does the AON7400B meet halogen-free requirements per AOS Green Policy?

Yes, the AON7400B complies fully with AOS Green Policy: bromine and chlorine content are each below 900ppm, and total halogen content is below 1500ppm in the molding compound. It is classified as a halogen-free product and carries no "L" suffix because the DFN5x6 package was converted to green status prior to 2010 and does not require dual numbering.

What is the gate threshold voltage range for the AON7400B?

The AON7400B has a gate threshold voltage (V_GS(th)) range of 1.2V to 2.2V at I_D = 250μA. This ensures robust turn-on with standard 3.3V logic-level gate drivers while maintaining sufficient noise margin against false triggering in noisy power environments.

Can the AON7400B be used as a high-side switch in a synchronous buck converter?

Yes, the AON7400B is commonly deployed as the high-side switch in synchronous buck converters. Its 30V V_DS rating, low 2.8mΩ R_DS(on), and 22nC gate charge make it well-suited for high-efficiency 12V-input VRMs. Gate drive must provide ≥10V to ensure full enhancement and minimize conduction loss.

What is the thermal resistance from junction to case (R_θJC) for the AON7400B?

The AON7400B has a maximum junction-to-case thermal resistance (R_θJC) of 1.2°C/W. This value is measured from the silicon die to the exposed drain pad surface and assumes full-solder coverage of the thermal pad. It enables effective heat transfer to the PCB, supporting high-power operation in compact layouts when paired with adequate copper area.

AON7400B Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

Package/Case:: 8-PowerVDFN

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:: 18A (Ta), 40A (Tc)

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

Rds On (Max) @ Id, Vgs:: 7.5mOhm @ 18A, 10V

Vgs(th) (Max) @ Id:: 2.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 26 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 1440 pF @ 15 V

FET Feature:: -

Power Dissipation (Max):: 4.1W (Ta), 24W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

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

AON7400B FAQ

1.How can I place an order for AON7400B through Aetrix?

Please submit a Request for Quotation (RFQ) for AON7400B 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 AON7400B reliable?

The price and inventory of AON7400B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AON7400B is usually 5 days.

3.What payment methods are accepted for AON7400B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AON7400B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AON7400B?

AON7400B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AON7400B 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 AON7400B?

For technical support, including AON7400B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AON7400B requirements.

6.How does Aetrix verify that AON7400B is sourced from the original manufacturer or authorized distributors?

All AON7400B 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 AON7400B meets industry standards.

7.What is the process for return or replacement of AON7400B?

All AON7400B units undergo pre-shipment inspection (PSI). If there is an issue with AON7400B, 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 AON7400B part is unused and in its original packaging.

Return procedure for AON7400B:

1.Submit a request within 90 days.

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

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