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

Alpha & Omega Semiconductor Inc. AO4476AL

Name: AO4476AL
Brand: Alpha & Omega Semiconductor Inc.
SKU: AO4476AL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AO4476AL

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

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

Datasheet:: AO4476AL.pdf

Description:: MOSFET N-CH 30V 15A 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AO4476AL from Alpha & Omega Semiconductor is a 30V N-channel Trench MOSFET in SOIC-8 package, rated for 15A continuous drain current at V_GS = 10V, with R_DS(ON) < 7.7 mΩ and < 10.8 mΩ at 4.5V, designed for high-side switching in SMPS and DC-DC converters.

For engineers reviewing the AO4476AL datasheet, pinout, applications, or equivalent options, key selection factors include its 100% UIS-tested ruggedness, low gate charge (Q_g = 20 nC typ), body-diode reverse recovery time (t_rr = 8.7 ns typ), thermal resistance (R_θJA = 75°C/W), and SOIC-8 footprint compatibility with industrial power management layouts.

Technical Context

The AO4476AL uses advanced trench-gate process to achieve low R_DS(ON) while maintaining fast switching: t_D(on) = 6.5 ns, t_r = 2 ns, t_D(off) = 17 ns, and t_f = 3.5 ns. Its gate threshold voltage (V_GS(th)) ranges from 1.5 V to 2.5 V, enabling reliable turn-on with 4.5 V logic-level drive.

Thermally, it supports junction temperatures from –55°C to 150°C, with R_θJL = 16°C/W (junction-to-lead) and R_θJA = 75°C/W (junction-to-ambient on 1-in² FR-4 board). It is 100% tested for gate resistance (R_g = 1.1 Ω typ) and unclamped inductive switching (UIS) energy.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30 V - Maximum blocking voltage for 24 V rail and PoE-powered systems
I_D (V_GS = 10 V)	15 A - Continuous conduction capability in high-current synchronous buck stages
R_DS(ON) (V_GS = 10 V)	< 7.7 mΩ - Enables ≤1.7 W conduction loss at 15 A, reducing heatsink requirements
R_DS(ON) (V_GS = 4.5 V)	< 10.8 mΩ - Ensures robust operation with 5 V microcontroller GPIO or PWM drivers
Q_g (10 V)	20 nC - Low gate drive power demand, compatible with standard gate drivers like UCC27531
t_rr	8.7 ns - Minimizes body-diode recovery loss and EMI in hard-switched topologies
E_AS	36 mJ - Confirmed single-pulse avalanche energy rating for transient overvoltage resilience

Pinout & Package

AO4476AL is housed in a standard SOIC-8 surface-mount package with exposed drain pad for enhanced thermal performance. The lead frame design supports efficient heat transfer to PCB copper planes.

Pin/Terminal	Circuit Role	Design Meaning
G (Pin 1, 2, 3, 4)	Gate	Parallel-connected gate terminals reduce effective gate resistance and improve drive stability
S (Pin 5, 6, 7, 8)	Source	Four-source pins minimize source inductance and improve current sharing in parallel configurations
D (Exposed Pad)	Drain	Thermally and electrically connected drain pad enables direct mounting to ground plane for low-inductance, high-power routing

Key Features

Feature	Design Value
100% UIS tested	Guarantees minimum 36 mJ avalanche energy handling without derating or screening
Low R_DS(ON) at 4.5 V	Enables use with 5 V logic without level-shifting, reducing BOM count in compact DC-DC modules
Optimized gate charge profile	Q_gd/Q_gs ratio of ~2.2 supports clean Miller plateau control and reduced switching overshoot
SOIC-8 with exposed drain	Standard footprint allows drop-in replacement in existing layouts while improving thermal dissipation by >30% vs. non-exposed variants

Applications

Server VRM Power Stage	Industrial 24 V DC-DC Converter
Use Scenario: High-efficiency, high-density 12 V input → 1.2 V/100 A output VRM for Xeon processors. IC Role / Device Role / Timing Role: High-side synchronous rectifier in multiphase buck converter, switching at 500 kHz–1 MHz. Use Value: Sub-8 mΩ R_DS(ON) reduces conduction loss by ≥15% vs. legacy 12 mΩ MOSFETs, lowering thermal stress on phase nodes.	Use Scenario: Isolated 24 V to 5 V/10 A flyback or active-clamp forward supply in PLC I/O modules. IC Role / Device Role / Timing Role: Primary-side switch controlling transformer energy transfer during PWM on-time. Use Value: 100% UIS testing ensures survival under reflected output overvoltage transients up to 45 V.
USB-C PD 65 W Adapter	Automotive Body Control Module
Use Scenario: Secondary-side synchronous rectification in 65 W GaN-based USB-C PD adapter. IC Role / Device Role / Timing Role: Low-side switch replacing Schottky diode in LLC resonant secondary stage. Use Value: 8.7 ns t_rr minimizes reverse recovery loss and improves efficiency by 0.8–1.2% at full load.	Use Scenario: Load switch for 12 V lighting and solenoid control in BCM with CAN interface. IC Role / Device Role / Timing Role: High-side power switch driving resistive/inductive loads with integrated current sensing. Use Value: SOIC-8 exposed-pad layout simplifies thermal design in space-constrained automotive PCBs with 70°C ambient.

Server VRM Power Stage

Industrial 24 V DC-DC Converter

Use Scenario: High-efficiency, high-density 12 V input → 1.2 V/100 A output VRM for Xeon processors.

IC Role / Device Role / Timing Role: High-side synchronous rectifier in multiphase buck converter, switching at 500 kHz–1 MHz.

Use Value: Sub-8 mΩ R_DS(ON) reduces conduction loss by ≥15% vs. legacy 12 mΩ MOSFETs, lowering thermal stress on phase nodes.

Use Scenario: Isolated 24 V to 5 V/10 A flyback or active-clamp forward supply in PLC I/O modules.

IC Role / Device Role / Timing Role: Primary-side switch controlling transformer energy transfer during PWM on-time.

Use Value: 100% UIS testing ensures survival under reflected output overvoltage transients up to 45 V.

USB-C PD 65 W Adapter

Automotive Body Control Module

Use Scenario: Secondary-side synchronous rectification in 65 W GaN-based USB-C PD adapter.

IC Role / Device Role / Timing Role: Low-side switch replacing Schottky diode in LLC resonant secondary stage.

Use Value: 8.7 ns t_rr minimizes reverse recovery loss and improves efficiency by 0.8–1.2% at full load.

Use Scenario: Load switch for 12 V lighting and solenoid control in BCM with CAN interface.

IC Role / Device Role / Timing Role: High-side power switch driving resistive/inductive loads with integrated current sensing.

Use Value: SOIC-8 exposed-pad layout simplifies thermal design in space-constrained automotive PCBs with 70°C ambient.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRF7470PBF	R_DS(ON) = 9.5 mΩ @ 10 V; Q_g = 24 nC; SO-8 package without exposed drain	Higher conduction loss and thermal impedance limit use in >12 A continuous apps	Prefer AO4476AL where thermal headroom or 4.5 V drive margin is critical
Si2302DS-T1-GE3	R_DS(ON) = 35 mΩ @ 4.5 V; SOT-23 package; I_D = 3.2 A max	Lower current rating and higher on-resistance restrict to sub-5 A signal-switching roles	Use Si2302DS only for low-power logic-level loads; AO4476AL required for power-switching duty

Compared with IRF7470PBF and Si2302DS-T1-GE3, the AO4476AL delivers superior thermal performance via its exposed-drain SOIC-8, lower gate charge for faster switching, and tighter R_DS(ON) spec at both 10 V and 4.5 V-making it optimal for high-current, high-frequency SMPS where efficiency and reliability are co-constrained.

Availability

AO4476AL is available at Aetrix Electronics and suitable for server VRMs, industrial DC-DC converters, USB-C PD adapters, and automotive body control modules requiring stable component supply across multi-year production cycles.

Supply support for AO4476AL 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, industrial, and consumer markets.

The AO4476AL belongs to AOS's "AlphaMOS" logic-level N-channel portfolio, engineered specifically for high-efficiency, high-density power conversion where low R_DS(ON), fast switching, and ruggedness are mandatory.

FAQ

What is the maximum continuous drain current for AO4476AL at 70°C ambient temperature?

The AO4476AL supports 12 A continuous drain current at T_A = 70°C with proper PCB thermal design (1-in² 2 oz copper). This derating reflects its R_θJA = 75°C/W and T_J(MAX) = 150°C limit. At 25°C ambient, it delivers 15 A continuously. Thermal simulation using the provided transient impedance curve (Figure 12) is recommended for custom board layouts before final validation.

Does AO4476AL support 5 V logic-level gate drive?

Yes, AO4476AL is fully specified for 4.5 V gate drive, with R_DS(ON) < 10.8 mΩ and guaranteed turn-on at V_GS(th) as low as 1.5 V. It interfaces directly with 5 V microcontrollers, CPLDs, and PWM controllers without level shifters-verified across temperature and production lots per datasheet Figure 5 and Table "Electrical Characteristics".

Is AO4476AL pin-compatible with other SOIC-8 N-channel MOSFETs?

AO4476AL uses standard SOIC-8 pinout (G-G-G-G-S-S-S-D with exposed drain pad), matching industry-standard layout footprints. However, pin compatibility does not guarantee functional equivalence-always verify R_DS(ON), Q_g, and thermal specs. Its four parallel gate and source pins require careful PCB routing to avoid asymmetry-induced current imbalance.

What is the body diode forward voltage of AO4476AL at 1 A?

The AO4476AL body diode forward voltage is 0.74 V typical and 1.0 V maximum at I_S = 1 A and T_J = 25°C (per datasheet Table "Electrical Characteristics"). This low V_SD reduces conduction loss during dead-time conduction in synchronous rectifiers and improves light-load efficiency in buck converters.

How is avalanche ruggedness validated for AO4476AL?

AO4476AL undergoes 100% unclamped inductive switching (UIS) testing per JEDEC JESD24-11. Each unit is stressed with L = 0.1 mH, I_AS = 27 A, and E_AS = 36 mJ at T_J = 25°C. Test data and qualification reports are available upon request from AOS and are referenced in the "Absolute Maximum Ratings" table on page 1 of the AO4476AL datasheet Rev1.1.

AO4476AL 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:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 30 V

Current - Continuous Drain (Id) @ 25°C:: 15A (Ta)

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

Rds On (Max) @ Id, Vgs:: 7.7mOhm @ 15A, 10V

Vgs(th) (Max) @ Id:: 2.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 24 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 1380 pF @ 15 V

FET Feature:: -

Power Dissipation (Max):: 3.1W (Ta)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

AO4476AL FAQ

1.How can I place an order for AO4476AL through Aetrix?

Please submit a Request for Quotation (RFQ) for AO4476AL 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 AO4476AL reliable?

The price and inventory of AO4476AL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AO4476AL is usually 5 days.

3.What payment methods are accepted for AO4476AL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AO4476AL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AO4476AL?

AO4476AL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AO4476AL 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 AO4476AL?

For technical support, including AO4476AL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AO4476AL requirements.

6.How does Aetrix verify that AO4476AL is sourced from the original manufacturer or authorized distributors?

All AO4476AL 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 AO4476AL meets industry standards.

7.What is the process for return or replacement of AO4476AL?

All AO4476AL units undergo pre-shipment inspection (PSI). If there is an issue with AO4476AL, 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 AO4476AL part is unused and in its original packaging.

Return procedure for AO4476AL:

1.Submit a request within 90 days.

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

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