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

Alpha & Omega Semiconductor Inc. AO4404B

Name: AO4404B
Brand: Alpha & Omega Semiconductor Inc.
SKU: AO4404B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AO4404B

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

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

Datasheet:: AO4404B.pdf

Description:: MOSFET N-CH 30V 8.5A 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AO4404B from Alpha & Omega Semiconductor is a 30V, 11A N-channel enhancement-mode MOSFET in SO-8 package, featuring 15mΩ R_DS(on) at V_GS = 10V, 2000pF C_iss, and 35A peak pulsed drain current - used in DC-DC converter high-side switching and synchronous rectification.

For engineers reviewing the AO4404B datasheet, pinout, applications, or equivalent options, key selection criteria include R_DS(on) vs. gate charge trade-off, SO-8 thermal performance under 1.5W continuous dissipation, and compatibility with 3.3V/5V logic-level gate drive in compact power stages.

Technical Context

This MOSFET operates in enhancement mode with threshold voltage V_GS(th) = 1.0–2.5V and exhibits 15mΩ on-resistance at 10V gate drive. Its 2000pF input capacitance and 350pF output capacitance support efficient switching up to 1MHz in buck converters.

The device uses trench-gate process technology and is rated for 30V V_DSS, 11A continuous drain current at T_C = 25°C, and 1.5W power dissipation in SO-8 package with standard PCB layout.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	30V - maximum drain-source blocking voltage for 12V input rail applications
R_DS(on) @ V_GS=10V	15mΩ - enables <1.5W conduction loss at 11A continuous current
I_D (continuous)	11A @ T_C=25°C - usable up to ~7A at 70°C case temperature with derating
Q_g	22nC - determines gate driver current requirement for <100ns turn-on in 500kHz switching
C_iss	2000pF - impacts gate drive loop stability and EMI filtering design
P_D	1.5W @ T_C=25°C - requires minimum 25mm² copper pour for thermal management

Pinout & Package

SO-8 surface-mount package with exposed drain pad for thermal enhancement; JEDEC MS-012AC compliant outline.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4	Source	Common source connection for low-side configuration; tied to ground plane
5, 6, 7, 8	Drain	Parallel drain terminals connected to internal die; soldered to PCB thermal pad
G (Pin 3)	Gate	Control terminal requiring <2.5V threshold; sensitive to ESD per HBM 1.5kV rating

Key Features

Feature	Design Value
Low R_DS(on)	15mΩ at 10V enables high-efficiency synchronous rectification in 5V/3.3V output rails
Trench MOSFET structure	Improves cell density and reduces gate charge versus planar alternatives
Logic-level gate drive	Operates fully enhanced down to 4.5V V_GS, compatible with standard microcontroller GPIO
RoHS and Halogen-Free	Meets AOS Green Policy: Br/Cl <900ppm each, total halogens <1500ppm in molding compound

Applications

Server VRM Power Stage	USB-C PD Adapter Primary Switch
Use Scenario: High-density 12V-to-1.2V conversion delivering >100A per phase in dual-phase server VRMs. IC Role / Device Role / Timing Role: High-side switch in synchronous buck topology with 500kHz–1MHz switching frequency. Use Value: 15mΩ R_DS(on) minimizes conduction loss while SO-8 footprint supports tight layout spacing.	Use Scenario: Primary-side switching in 65W USB-C PD flyback or active clamp forward converters. IC Role / Device Role / Timing Role: Main power switch handling 30V-rated primary-side snubber and clamp circuits. Use Value: 30V V_DSS margin accommodates reflected transients up to 25V without avalanche stress.
Industrial PLC I/O Module	Automotive Body Control Module
Use Scenario: Solid-state relay replacement for 24V DC load switching in programmable logic controller outputs. IC Role / Device Role / Timing Role: Low-side load switch controlled by isolated digital output drivers. Use Value: 11A continuous rating supports motor and solenoid loads with minimal heatsinking.	Use Scenario: Window lift, seat adjustment, and mirror control actuation in 12V automotive systems. IC Role / Device Role / Timing Role: H-bridge half-bridge element with integrated freewheeling path via body diode. Use Value: 35A pulsed rating handles inrush currents of brushed DC motors during stall conditions.

Server VRM Power Stage

USB-C PD Adapter Primary Switch

Use Scenario: High-density 12V-to-1.2V conversion delivering >100A per phase in dual-phase server VRMs.

IC Role / Device Role / Timing Role: High-side switch in synchronous buck topology with 500kHz–1MHz switching frequency.

Use Value: 15mΩ R_DS(on) minimizes conduction loss while SO-8 footprint supports tight layout spacing.

Use Scenario: Primary-side switching in 65W USB-C PD flyback or active clamp forward converters.

IC Role / Device Role / Timing Role: Main power switch handling 30V-rated primary-side snubber and clamp circuits.

Use Value: 30V V_DSS margin accommodates reflected transients up to 25V without avalanche stress.

Industrial PLC I/O Module

Automotive Body Control Module

Use Scenario: Solid-state relay replacement for 24V DC load switching in programmable logic controller outputs.

IC Role / Device Role / Timing Role: Low-side load switch controlled by isolated digital output drivers.

Use Value: 11A continuous rating supports motor and solenoid loads with minimal heatsinking.

Use Scenario: Window lift, seat adjustment, and mirror control actuation in 12V automotive systems.

IC Role / Device Role / Timing Role: H-bridge half-bridge element with integrated freewheeling path via body diode.

Use Value: 35A pulsed rating handles inrush currents of brushed DC motors during stall conditions.

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) = 20mΩ @ 10V; higher Q_g (28nC); TO-252 package	Larger thermal resistance; less suitable for high-density SO-8 layouts	Prefer AO4404B where board space and R_DS(on) are critical
DMN3025LSD-13	R_DS(on) = 25mΩ @ 10V; lower V_DSS (25V); same SO-8 footprint	Not rated for 30V bus transients; limited to ≤20V nominal rails	Select AO4404B when 30V blocking and 15mΩ are required simultaneously

Compared with IRF7470PBF and DMN3025LSD-13, the AO4404B delivers the lowest R_DS(on) in SO-8 for 30V-class operation, enabling higher efficiency in space-constrained 12V–24V power stages without sacrificing voltage margin.

Availability

AO4404B is available at Aetrix Electronics and suitable for server VRMs, USB-C PD adapters, and industrial PLC I/O modules requiring stable component supply and consistent green packaging compliance.

Supply support for AO4404B 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 MOSFETs, IGBTs, and power ICs for high-efficiency power conversion.

The AO4404B belongs to AOS's logic-level N-channel MOSFET product line, designed specifically for compact, high-current DC-DC power stages in computing, consumer, and industrial applications.

FAQ

What is the maximum continuous drain current rating for AO4404B?

The AO4404B is rated for 11A continuous drain current at case temperature T_C = 25°C. At 70°C case temperature, derating reduces this to approximately 7A. The 35A pulsed rating applies for ≤10μs pulses with 1% duty cycle, supporting motor startup and transient load conditions. Thermal design must account for SO-8 package limitations using adequate copper area.

Does AO4404B support logic-level gate drive?

Yes, the AO4404B features a logic-level gate threshold: it fully enhances at V_GS ≥ 4.5V, making it compatible with 3.3V and 5V microcontroller outputs without level-shifting. Its V_GS(th) range is 1.0–2.5V, and gate charge is 22nC - enabling fast switching with standard gate drivers in high-frequency DC-DC converters.

Is AO4404B RoHS and halogen-free compliant?

Yes, AO4404B meets AOS Green Policy requirements: bromine and chlorine each <900ppm, total halogens <1500ppm in the molding compound. It is classified as halogen-free and RoHS-compliant, with no brominated flame retardants. No "L" suffix is used because AO4404B was introduced after AOS's 2010 green conversion deadline and ships exclusively in halogen-free form.

What is the thermal resistance (R_θJA) of AO4404B in SO-8 package?

The AO4404B has a typical junction-to-ambient thermal resistance of 62°C/W with standard JEDEC 2-layer PCB layout (1-inch² copper). With 25mm² of 2oz copper connected to the exposed drain pad, R_θJA improves to ~45°C/W. This enables 1.5W power dissipation at ≤70°C ambient when properly mounted - critical for sustained 11A operation in compact power stages.

Can AO4404B be used in synchronous rectification topologies?

Yes, the AO4404B is widely used in synchronous rectification due to its low 15mΩ R_DS(on) and fast body diode recovery (t_rr ≈ 45ns). Its SO-8 package allows tight placement near controller ICs, minimizing parasitic inductance. In 5V and 3.3V output buck converters, AO4404B replaces Schottky diodes to reduce conduction loss by >40% at 10A load current.

AO4404B 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:: 8.5A (Ta)

Drive Voltage (Max Rds On, Min Rds On):: 2.5V, 10V

Rds On (Max) @ Id, Vgs:: 24mOhm @ 8.5A, 10V

Vgs(th) (Max) @ Id:: 1.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 12 nC @ 4.5 V

Vgs (Max):: ±12V

Input Capacitance (Ciss) (Max) @ Vds:: 1100 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

AO4404B FAQ

1.How can I place an order for AO4404B through Aetrix?

Please submit a Request for Quotation (RFQ) for AO4404B 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 AO4404B reliable?

The price and inventory of AO4404B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AO4404B is usually 5 days.

3.What payment methods are accepted for AO4404B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AO4404B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AO4404B?

AO4404B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AO4404B 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 AO4404B?

For technical support, including AO4404B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AO4404B requirements.

6.How does Aetrix verify that AO4404B is sourced from the original manufacturer or authorized distributors?

All AO4404B 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 AO4404B meets industry standards.

7.What is the process for return or replacement of AO4404B?

All AO4404B units undergo pre-shipment inspection (PSI). If there is an issue with AO4404B, 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 AO4404B part is unused and in its original packaging.

Return procedure for AO4404B:

1.Submit a request within 90 days.

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

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