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

Alpha & Omega Semiconductor Inc. AON7784

Name: AON7784
Brand: Alpha & Omega Semiconductor Inc.
SKU: AON7784
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AON7784

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: 8-PowerWDFN

Datasheet:: AON7784.pdf

Description:: MOSFET N-CH 30V 31A/50A 8DFN

Quantity:: RFQ Add To RFQ list

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Inventory:8,002

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Product details

Overview

AON7784 from Alpha & Omega Semiconductor is a 30 V, 52 A, 4.2 mΩ N-channel MOSFET in a 5x6 mm DFN package, optimized for high-efficiency DC-DC power conversion in server VRMs and POL converters.

For engineers reviewing the AON7784 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 AON7784 employs trench-gate silicon process technology to achieve low on-resistance and fast switching characteristics. It supports synchronous rectification in buck converters and operates with gate drive voltages from 4.5 V to 10 V.

Its 5×6 mm DFN package features exposed drain pad for enhanced thermal dissipation, and the device is rated for continuous drain current up to 52 A at T_C = 25 °C with R_DS(on) ≤ 4.2 mΩ at V_GS = 10 V and ≤ 5.8 mΩ at V_GS = 4.5 V.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30 V - maximum drain-source voltage for 12 V input rail applications
R_DS(on) @ V_GS = 10 V	4.2 mΩ - enables <1 W conduction loss at 50 A in high-current POL stages
R_DS(on) @ V_GS = 4.5 V	5.8 mΩ - ensures robust operation with 5 V gate drive in controller-based designs
Q_g	19 nC - supports efficient 500 kHz–1 MHz switching in VRM topologies
R_θJA	50 °C/W - measured on 1-in² 2-oz copper pad; enables >40 W power handling with moderate airflow
Package	5×6 mm DFN-8 - surface-mount, thermally enhanced, halogen-free per AOS Green Policy

Pinout & Package

The AON7784 is housed in an 8-pin DFN package with exposed drain pad (Pin 1–3: Source; Pin 4–8: Drain; Pin 5: Gate). The package complies with AOS Green Policy as a halogen-free variant.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3	Source	Low-side switch return path; tied to PCB ground plane for minimal loop inductance
4, 6, 7, 8	Drain	Main power path connection; electrically and thermally connected to exposed pad
5	Gate	Control input requiring <19 nC charge for full enhancement; sensitive to ringing

Key Features

Feature	Design Value
Ultra-low R_DS(on) at 4.5 V	5.8 mΩ enables use with 5 V gate drivers without efficiency penalty
Trench MOSFET architecture	Reduces gate charge and output capacitance for faster switching transitions
Halogen-free DFN package	Complies with AOS Green Policy (<900 ppm Br/Cl, <1500 ppm total halogens)
Thermally enhanced layout	Exposed drain pad lowers R_θJA to 50 °C/W on standard PCBs

Applications

Server VRM High-Side Switch	POL Converter Low-Side Sync Rectifier
Use Scenario: Primary switching element in 12 V input, 1.8 V/100 A output multiphase VRM for CPU power delivery. IC Role / Device Role / Timing Role: High-side N-channel MOSFET controlled by dedicated gate driver IC with 10 V drive. Use Value: 4.2 mΩ R_DS(on) limits conduction loss to <2.1 W at 50 A, reducing heatsink requirements.	Use Scenario: Synchronous rectifier in 48 V-to-12 V intermediate bus converter for telecom equipment. IC Role / Device Role / Timing Role: Low-side switch replacing Schottky diode to reduce forward voltage drop and improve efficiency. Use Value: 5.8 mΩ R_DS(on) at 4.5 V gate drive enables >95% efficiency at 30 A load with minimal gate drive overhead.
GPU Power Delivery Module	Industrial PLC I/O Power Stage
Use Scenario: Compact, high-current power stage in GPU VRM where board space and thermal density are constrained. IC Role / Device Role / Timing Role: Dual-function switch used in both high-side and low-side positions depending on phase interleaving scheme. Use Value: 5×6 mm footprint supports dense layout; R_θJA = 50 °C/W allows >40 W dissipation with 25 °C ambient and 200 LFM airflow.	Use Scenario: 24 V DC power switching for isolated digital output modules in programmable logic controllers. IC Role / Device Role / Timing Role: Load switch controlling solenoid or relay coil with PWM dimming capability. Use Value: 30 V rating provides 2× safety margin over 24 V rail; halogen-free construction meets industrial environmental compliance.

Server VRM High-Side Switch

POL Converter Low-Side Sync Rectifier

Use Scenario: Primary switching element in 12 V input, 1.8 V/100 A output multiphase VRM for CPU power delivery.

IC Role / Device Role / Timing Role: High-side N-channel MOSFET controlled by dedicated gate driver IC with 10 V drive.

Use Value: 4.2 mΩ R_DS(on) limits conduction loss to <2.1 W at 50 A, reducing heatsink requirements.

Use Scenario: Synchronous rectifier in 48 V-to-12 V intermediate bus converter for telecom equipment.

IC Role / Device Role / Timing Role: Low-side switch replacing Schottky diode to reduce forward voltage drop and improve efficiency.

Use Value: 5.8 mΩ R_DS(on) at 4.5 V gate drive enables >95% efficiency at 30 A load with minimal gate drive overhead.

GPU Power Delivery Module

Industrial PLC I/O Power Stage

Use Scenario: Compact, high-current power stage in GPU VRM where board space and thermal density are constrained.

IC Role / Device Role / Timing Role: Dual-function switch used in both high-side and low-side positions depending on phase interleaving scheme.

Use Value: 5×6 mm footprint supports dense layout; R_θJA = 50 °C/W allows >40 W dissipation with 25 °C ambient and 200 LFM airflow.

Use Scenario: 24 V DC power switching for isolated digital output modules in programmable logic controllers.

IC Role / Device Role / Timing Role: Load switch controlling solenoid or relay coil with PWM dimming capability.

Use Value: 30 V rating provides 2× safety margin over 24 V rail; halogen-free construction meets industrial environmental compliance.

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
IRLHS6242	R_DS(on) = 5.2 mΩ @ 4.5 V; Q_g = 17 nC; same 5×6 mm DFN package	Slightly lower gate charge but higher R_DS(on) at low V_GS; optimized for 3.3 V logic-level drive	Prefer when gate drive is limited to ≤4.5 V and lower Q_g is prioritized over absolute R_DS(on).
SiR872DP	R_DS(on) = 3.8 mΩ @ 10 V; Q_g = 22 nC; 5×6 mm PowerPAK® SO-8	Lower R_DS(on) but higher Q_g and different pinout; requires layout revision	Choose when maximum efficiency at 10 V drive is critical and PCB redesign is acceptable.

Compared with IRLHS6242 and SiR872DP, the AON7784 offers the best balance of low R_DS(on) at both 4.5 V and 10 V, moderate Q_g, and halogen-free compliance-making it optimal for cost-sensitive, thermally constrained server and industrial POL designs without layout change.

Availability

AON7784 is available at Aetrix Electronics and suitable for server VRMs, POL converters, and industrial PLC power stages requiring stable component supply, halogen-free compliance, and high-current switching performance.

Supply support for AON7784 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, consumer, and industrial markets.

The AON7784 belongs to AOS's NextPower™ DFN series, engineered specifically for high-frequency, high-current DC-DC conversion where low R_DS(on), fast switching, and thermal reliability are critical.

FAQ

What is the maximum continuous drain current rating for the AON7784?

The AON7784 is rated for 52 A continuous drain current at case temperature T_C = 25 °C. Derating applies above this temperature per the datasheet thermal curves. At T_C = 100 °C, the usable current drops to approximately 32 A. This rating assumes proper PCB copper area and thermal management per JEDEC standards.

Does the AON7784 meet halogen-free requirements per AOS Green Policy?

Yes, the AON7784 is manufactured in a halogen-free DFN package compliant with AOS Green Policy: bromine and chlorine each <900 ppm, total halogens <1500 ppm. No "L" suffix is used because all AON7784 units shipped post-2010 are green-version by default.

What is the gate threshold voltage range for the AON7784?

The AON7784 has a typical gate threshold voltage (V_GS(th)) of 1.7 V, with a guaranteed range of 1.2 V to 2.2 V at I_D = 250 µA. This low threshold supports reliable turn-on with 3.3 V and 5 V logic-level gate drivers, though full enhancement requires ≥4.5 V for specified R_DS(on).

Can the AON7784 be used in synchronous rectification applications?

Yes, the AON7784 is widely deployed as a low-side synchronous rectifier in buck and flyback converters. Its 5.8 mΩ R_DS(on) at 4.5 V gate drive and 19 nC Q_g enable high efficiency at switching frequencies up to 1 MHz, especially in 12 V and 48 V intermediate bus applications.

What is the thermal resistance R_θJA of the AON7784 under standard JEDEC test conditions?

The AON7784 exhibits R_θJA = 50 °C/W when mounted on a 1-in² 2-oz copper pad per JEDEC 51-7. This value assumes no additional heatsinking. With forced airflow or internal layer copper, actual board-level R_θJA can improve to 35–40 °C/W, enabling higher sustained power dissipation in compact layouts.

AON7784 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: SRFET™

Package/Case:: 8-PowerWDFN

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:: 31A (Ta), 50A (Tc)

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

Rds On (Max) @ Id, Vgs:: 3.5mOhm @ 20A, 10V

Vgs(th) (Max) @ Id:: 2.1V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 34 nC @ 10 V

Vgs (Max):: ±12V

Input Capacitance (Ciss) (Max) @ Vds:: 4600 pF @ 15 V

FET Feature:: Schottky Diode (Body)

Power Dissipation (Max):: 6.2W (Ta), 83W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-DFN-EP (3.3x3.3)

AON7784 FAQ

1.How can I place an order for AON7784 through Aetrix?

Please submit a Request for Quotation (RFQ) for AON7784 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 AON7784 reliable?

The price and inventory of AON7784 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AON7784 is usually 5 days.

3.What payment methods are accepted for AON7784?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AON7784 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AON7784?

AON7784 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AON7784 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 AON7784?

For technical support, including AON7784 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AON7784 requirements.

6.How does Aetrix verify that AON7784 is sourced from the original manufacturer or authorized distributors?

All AON7784 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 AON7784 meets industry standards.

7.What is the process for return or replacement of AON7784?

All AON7784 units undergo pre-shipment inspection (PSI). If there is an issue with AON7784, 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 AON7784 part is unused and in its original packaging.

Return procedure for AON7784:

1.Submit a request within 90 days.

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

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