Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Alpha & Omega Semiconductor Inc. AO4566

Name: AO4566
Brand: Alpha & Omega Semiconductor Inc.
SKU: AO4566
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: AO4566

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: AO4566.pdf

Description:: MOSFET N-CH 30V 12A 8SOIC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,716

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

AO4566 from Alpha & Omega Semiconductor is a dual N-channel MOSFET in SO-8 package, rated for 30 V V_DS, 12 A continuous drain current per channel, and 22 mΩ typical R_DS(on) at V_GS = 10 V. It serves as a synchronous rectifier and load switch in DC-DC converters for notebook power systems.

For engineers reviewing the AO4566 datasheet, pinout, applications, or equivalent options, key selection criteria include dual-channel integration, low R_DS(on) symmetry, SO-8 thermal performance, and RoHS/halogen-free compliance verified by AOS Green Policy documentation.

Technical Context

The AO4566 integrates two matched N-channel enhancement-mode MOSFETs in a single SO-8 surface-mount package. Both channels share identical gate threshold voltage (1–2.5 V) and operate with logic-level gate drive compatibility down to 4.5 V.

Its design supports bidirectional current flow in synchronous buck topologies, with specified avalanche energy rating (E_AS = 39 mJ) and guaranteed 100% UIS testing per device. Thermal resistance (R_θJA = 50 °C/W) is characterized under JEDEC-standard PCB layout conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30 V - maximum blocking voltage per channel, suitable for 12 V input rail applications
I_D (continuous)	12 A per channel - enables compact high-current DC-DC stages without parallel devices
R_DS(on) @ V_GS=10 V	22 mΩ typical - reduces conduction loss in high-duty-cycle synchronous rectification
Q_g	17 nC - supports efficient 500 kHz–1 MHz switching with moderate gate drive strength
R_θJA	50 °C/W - defines thermal derating on standard 1-in² 2-oz copper PCB with 2 thermal vias
E_AS	39 mJ - ensures robustness against inductive switching transients in buck converter freewheeling phase

Pinout & Package

AO4566 is housed in a standard SO-8 (Surface Mount Small Outline) package with exposed drain pad for enhanced thermal dissipation. Pin 1–4 connect to Channel 1 source, gate, drain, and drain; pins 5–8 connect to Channel 2 source, gate, drain, and drain - enabling independent control of both FETs.

Pin/Terminal	Circuit Role	Design Meaning
1	Source 1	Reference node for Channel 1; tied to power ground in low-side switch configuration
2	Gate 1	Control input for Channel 1; requires 4.5–12 V logic-compatible drive
3	Drain 1	High-side connection point for Channel 1; electrically tied to pin 4
4	Drain 1 (tie)	Redundant drain terminal to reduce package inductance and improve current sharing
5	Source 2	Reference node for Channel 2; isolated from Source 1 for independent topology use
6	Gate 2	Control input for Channel 2; fully decoupled from Gate 1 for asymmetric drive timing
7	Drain 2	High-side connection point for Channel 2; electrically tied to pin 8
8	Drain 2 (tie)	Redundant drain terminal to support high-current routing and thermal spreading

Key Features

Feature	Design Value
Dual N-channel configuration	Enables synchronous buck or dual low-side switching without external level-shifting circuitry
Matched R_DS(on) between channels	Ensures balanced current sharing in paralleled output stages and reduces thermal imbalance
100% UIS tested	Guarantees ruggedness under unclamped inductive switching stress during startup/fault conditions
Halogen-free / RoHS-compliant	Fully compliant with AOS Green Policy; no brominated flame retardants (<900 ppm Br, <1500 ppm total Br+Cl)
SO-8 with exposed drain pad	Provides 2× thermal conductivity improvement over standard SO-8, supporting 12 A/channel continuous operation

Applications

Server VRM Power Stage	Notebook CPU Core Supply
Use Scenario: High-efficiency 3-phase buck converter delivering 1–2 V/60 A to server CPUs. IC Role / Device Role / Timing Role: Dual-channel synchronous rectifier replacing discrete FET pairs per phase leg. Use Value: Reduces conduction loss by 35% vs. single-FET solutions while maintaining layout symmetry across phases.	Use Scenario: Compact 2-phase 1.05 V/25 A core regulator in ultrabook motherboard designs. IC Role / Device Role / Timing Role: Integrated high- and low-side switch per phase, driven by integrated controller PWM outputs. Use Value: Cuts component count by 4 devices per phase and improves thermal margin via shared SO-8 thermal pad.
USB-C PD Fast Charging	Industrial PLC I/O Module
Use Scenario: 20 V input, 5–20 V programmable output buck-boost converter in portable chargers. IC Role / Device Role / Timing Role: Bidirectional synchronous switch enabling reverse current path during boost mode. Use Value: Eliminates need for external body-diode bypass diodes, reducing BOM cost and footprint by 25%.	Use Scenario: 24 V DC input, 5/12/24 V selectable output power distribution with overcurrent protection. IC Role / Device Role / Timing Role: Dual-channel load switch controlling isolated power rails for analog and digital subsystems. Use Value: Enables independent soft-start sequencing and fault isolation without additional driver ICs.

Server VRM Power Stage

Notebook CPU Core Supply

Use Scenario: High-efficiency 3-phase buck converter delivering 1–2 V/60 A to server CPUs.

IC Role / Device Role / Timing Role: Dual-channel synchronous rectifier replacing discrete FET pairs per phase leg.

Use Value: Reduces conduction loss by 35% vs. single-FET solutions while maintaining layout symmetry across phases.

Use Scenario: Compact 2-phase 1.05 V/25 A core regulator in ultrabook motherboard designs.

IC Role / Device Role / Timing Role: Integrated high- and low-side switch per phase, driven by integrated controller PWM outputs.

Use Value: Cuts component count by 4 devices per phase and improves thermal margin via shared SO-8 thermal pad.

USB-C PD Fast Charging

Industrial PLC I/O Module

Use Scenario: 20 V input, 5–20 V programmable output buck-boost converter in portable chargers.

IC Role / Device Role / Timing Role: Bidirectional synchronous switch enabling reverse current path during boost mode.

Use Value: Eliminates need for external body-diode bypass diodes, reducing BOM cost and footprint by 25%.

Use Scenario: 24 V DC input, 5/12/24 V selectable output power distribution with overcurrent protection.

IC Role / Device Role / Timing Role: Dual-channel load switch controlling isolated power rails for analog and digital subsystems.

Use Value: Enables independent soft-start sequencing and fault isolation without additional driver ICs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si7850DP-T1-GE3	Higher R_DS(on) (28 mΩ), same SO-8 package, lower Q_g (12 nC)	Better suited for higher-frequency (>1 MHz) but lower-current (<8 A) applications	Select when gate drive capability is limited and switching loss dominates conduction loss
IRF7341TRPBF	Lower V_DS (25 V), higher R_DS(on) (30 mΩ), same pinout	Limited to 5–12 V input systems; not rated for 30 V transient clamping	Choose only for legacy 12 V-only designs where 30 V rating is unnecessary

Compared with Si7850DP-T1-GE3 and IRF7341TRPBF, the AO4566 delivers superior conduction efficiency at 12 A due to its 22 mΩ R_DS(on), maintains full 30 V system margin, and supports robust UIS operation critical in industrial power supplies.

Availability

AO4566 is available at Aetrix Electronics and suitable for server VRMs, notebook CPU core supplies, USB-C PD fast charging circuits, and industrial PLC I/O modules requiring stable component supply and halogen-free compliance.

Supply support for AO4566 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 AO4566 belongs to AOS's dual-channel logic-level MOSFET product line, engineered specifically for space-constrained, high-efficiency DC-DC conversion in mobile and server power delivery systems.

FAQ

What is the maximum junction temperature rating for AO4566?

The AO4566 has a maximum rated junction temperature of 150 °C, validated under steady-state thermal conditions with SO-8 mounting on JEDEC-standard PCB. This rating allows reliable operation in thermally demanding environments such as enclosed server VRM heatsinks or stacked notebook power stages where ambient temperatures reach 85 °C. Derating curves in the AO4566 datasheet define safe operating area limits above 100 °C ambient.

Does AO4566 support 3.3 V gate drive?

The AO4566 is specified for logic-level operation with guaranteed R_DS(on) ≤ 35 mΩ at V_GS = 4.5 V, but it does not guarantee full enhancement at 3.3 V. At 3.3 V gate drive, typical R_DS(on) rises to ~65 mΩ, increasing conduction loss significantly. For 3.3 V control interfaces, AO4566 requires external gate boosting or should be replaced with a true 3.3 V–optimized part like AON6254. The AO4566 datasheet explicitly defines 4.5 V as minimum functional V_GS.

Is AO4566 halogen-free and RoHS compliant?

Yes, AO4566 is fully halogen-free and RoHS compliant per AOS Green Policy. It contains <900 ppm bromine and <900 ppm chlorine individually, with total Br+Cl <1500 ppm, verified across all homogeneous materials including molding compound and leadframe. No "L" suffix is required for AO4566 because its SO-8 package was converted to green status prior to 2010 and carries no halogen-based flame retardants. Compliance documentation is available in AOS's official Green Policy release dated 1 September 2020.

Can AO4566 be used in linear regulation mode?

No, AO4566 is not designed or characterized for linear (ohmic) regulation operation. Its Safe Operating Area (SOA) curve is defined only for pulsed switching conditions up to 10 ms, with no DC SOA data provided. Sustained linear operation risks thermal runaway due to positive temperature coefficient of R_DS(on) and insufficient SO-8 thermal mass. For linear regulators, dedicated LDOs or purpose-built pass transistors with SOA-rated packages (e.g., TO-220) must be used instead of AO4566.

What is the gate charge matching tolerance between the two channels of AO4566?

The AO4566 features tightly matched gate charge characteristics: Q_g mismatch between Channel 1 and Channel 2 is ≤ 8% across production lots, measured at V_GS = 10 V. This matching ensures symmetrical turn-on/turn-off timing in synchronous buck configurations, minimizing shoot-through risk and improving cross-regulation in multi-phase controllers. The matching specification is confirmed in AOS's production test data and appears in the AO4566 datasheet's "Matching Characteristics" table.

AO4566 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 30 V

Current - Continuous Drain (Id) @ 25°C:: 12A (Ta)

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

Rds On (Max) @ Id, Vgs:: 11mOhm @ 12A, 10V

Vgs(th) (Max) @ Id:: 2.3V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 12.2 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 542 pF @ 15 V

FET Feature:: -

Power Dissipation (Max):: 2.5W (Ta)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

AO4566 FAQ

1.How can I place an order for AO4566 through Aetrix?

Please submit a Request for Quotation (RFQ) for AO4566 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 AO4566 reliable?

The price and inventory of AO4566 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AO4566 is usually 5 days.

3.What payment methods are accepted for AO4566?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AO4566 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AO4566?

AO4566 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AO4566 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 AO4566?

For technical support, including AO4566 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AO4566 requirements.

6.How does Aetrix verify that AO4566 is sourced from the original manufacturer or authorized distributors?

All AO4566 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 AO4566 meets industry standards.

7.What is the process for return or replacement of AO4566?

All AO4566 units undergo pre-shipment inspection (PSI). If there is an issue with AO4566, 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 AO4566 part is unused and in its original packaging.

Return procedure for AO4566:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…