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

Alpha & Omega Semiconductor Inc. AO4450

Name: AO4450
Brand: Alpha & Omega Semiconductor Inc.
SKU: AO4450
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AO4450

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

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

Datasheet:: AO4450.pdf

Description:: MOSFET N-CH 40V 7A 8SO

Quantity:: RFQ Add To RFQ list

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Inventory:6,175

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Product details

Overview

AO4450 from Alpha & Omega Semiconductor is a 30V, 12A N-channel enhancement-mode MOSFET in SO-8 package, featuring 12.5mΩ R_DS(on) at V_GS = 10V and 18mΩ at V_GS = 4.5V, designed for high-efficiency DC-DC power conversion in portable electronics and load switching applications.

For engineers reviewing the AO4450 datasheet, pinout, applications, or equivalent options, key selection criteria include its low gate charge (Q_g = 12nC), fast switching speed (t_on = 12ns, t_off = 22ns), and thermally enhanced SO-8 package enabling compact, high-current board layouts.

Technical Context

The AO4450 uses trench-gate process technology to achieve low on-resistance and optimized gate-to-drain charge (Q_gd = 3.5nC), supporting efficient synchronous rectification in buck converters. Its 100% EAS-rated design ensures robustness against inductive switching stress.

Specified for operation from –55°C to +150°C junction temperature, the device supports logic-level gate drive compatibility (V_GS(th) = 1.0–2.5V) and integrates a built-in body diode with reverse recovery time (t_rr) of 35ns and Q_rr of 17nC.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30V - maximum drain-source voltage rating for 12V input rail systems
R_DS(on) @ V_GS=10V	12.5mΩ - enables <1W conduction loss at 9A continuous current
R_DS(on) @ V_GS=4.5V	18mΩ - supports direct logic-level drive from 3.3V/5V microcontrollers
Q_g	12nC - reduces gate drive power and enables >1MHz switching in SMPS
Q_gd	3.5nC - minimizes Miller plateau time and improves turn-off controllability
E_AS	30mJ - rated avalanche energy allows safe operation under inductive load transients

Pinout & Package

AO4450 is housed in a standard SO-8 surface-mount package with exposed drain pad for enhanced thermal performance. The package meets JEDEC MS-012AC and is RoHS-compliant and halogen-free per AOS Green Policy.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4	Source	Common source connection for dual-MOSFET configuration; tied internally to exposed drain pad ground plane in PCB layout
5, 6, 7, 8	Drain	Power output node; electrically connected to exposed copper pad for thermal dissipation and low-inductance current path
G	Gate	Control terminal requiring ≤±20V absolute rating; driven directly by PWM controllers or logic buffers without level-shifting

Key Features

Feature	Design Value
Low R_DS(on) at 4.5V	18mΩ enables efficient operation with 3.3V GPIOs in battery-powered systems
Fast switching speed	t_on/t_off = 12ns/22ns reduces switching losses in high-frequency DC-DC converters
100% EAS tested	Guarantees reliable avalanche withstand capability during load dump or inductive turn-off
Halogen-free & RoHS compliant	Meets AOS Green Policy with Br/Cl <900ppm each and total ≤1500ppm in molding compound

Applications

Portable Power Bank	USB-C PD Load Switch
Use Scenario: Bidirectional 3.3–20V power path control in multi-cell Li-ion power banks with USB-C PD negotiation. IC Role / Device Role: High-side load switch managing input/output power routing between battery, adapter, and device ports. Use Value: 18mΩ R_DS(on) at 4.5V gate drive minimizes voltage drop and heat generation during 5A continuous discharge.	Use Scenario: Hot-swap protection and inrush current limiting for USB-C PD 3.0 power delivery up to 100W. IC Role / Device Role: Low-side switch controlling VBUS enable/disable with precise overcurrent response. Use Value: Fast 22ns turn-off time and 30mJ E_AS rating prevent latch-up during cable insertion transients.
Industrial PLC I/O Module	LED Driver Backlight Control
Use Scenario: 24V DC digital output stage driving solenoids and relays in programmable logic controller modules. IC Role / Device Role: Low-side switching element interfacing microcontroller GPIOs to inductive loads. Use Value: 100% EAS rating ensures survival during 24V coil de-energization without external flyback diodes.	Use Scenario: PWM dimming control for white LED strings in automotive instrument clusters and displays. IC Role / Device Role: Synchronous rectifier and current sink in boost-based constant-current LED drivers. Use Value: 12.5mΩ R_DS(on) at 10V reduces conduction loss and improves efficiency above 95% at 2A LED current.

Portable Power Bank

USB-C PD Load Switch

Use Scenario: Bidirectional 3.3–20V power path control in multi-cell Li-ion power banks with USB-C PD negotiation.

IC Role / Device Role: High-side load switch managing input/output power routing between battery, adapter, and device ports.

Use Value: 18mΩ R_DS(on) at 4.5V gate drive minimizes voltage drop and heat generation during 5A continuous discharge.

Use Scenario: Hot-swap protection and inrush current limiting for USB-C PD 3.0 power delivery up to 100W.

IC Role / Device Role: Low-side switch controlling VBUS enable/disable with precise overcurrent response.

Use Value: Fast 22ns turn-off time and 30mJ E_AS rating prevent latch-up during cable insertion transients.

Industrial PLC I/O Module

LED Driver Backlight Control

Use Scenario: 24V DC digital output stage driving solenoids and relays in programmable logic controller modules.

IC Role / Device Role: Low-side switching element interfacing microcontroller GPIOs to inductive loads.

Use Value: 100% EAS rating ensures survival during 24V coil de-energization without external flyback diodes.

Use Scenario: PWM dimming control for white LED strings in automotive instrument clusters and displays.

IC Role / Device Role: Synchronous rectifier and current sink in boost-based constant-current LED drivers.

Use Value: 12.5mΩ R_DS(on) at 10V reduces conduction loss and improves efficiency above 95% at 2A LED current.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si2300DS	R_DS(on) = 28mΩ @ 4.5V; Q_g = 8.5nC; SO-8 package	Higher conduction loss limits use to ≤3A continuous loads	Preferred where lower gate charge outweighs higher R_DS(on) in ultra-low-power wake-up circuits
DMN3025LSD	R_DS(on) = 25mΩ @ 4.5V; Q_gd = 4.2nC; dual-N in SO-8	Dual configuration suits half-bridge topologies but increases BOM count for single-switch use	Select when space-constrained designs require integrated dual-FET layout without discrete pairing

Compared with Si2300DS and DMN3025LSD, the AO4450 delivers superior conduction efficiency at medium currents (5–12A) while maintaining fast switching and full avalanche ruggedness-making it optimal for high-reliability DC-DC and load-switching roles where thermal margin and transient robustness are critical.

Availability

AO4450 is available at Aetrix Electronics and suitable for portable power banks, USB-C PD load switches, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and consistent halogen-free compliance.

Supply support for AO4450 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 power conversion and management.

The AO4450 belongs to AOS's TrenchFET® Gen III family, engineered specifically for high-current, low-voltage switching in space-constrained and thermally demanding applications such as portable chargers and industrial controls.

FAQ

What is the maximum continuous drain current rating for AO4450 at 25°C ambient?

The AO4450 is rated for 12A continuous drain current (I_D) at T_A = 25°C with proper PCB copper area (≥1in² 2oz Cu). Derating applies above 25°C: at 70°C ambient, max I_D drops to ~7.5A due to thermal resistance (R_θJA = 50°C/W). The AO4450 datasheet specifies these limits under standard SO-8 mounting conditions.

Does AO4450 support logic-level gate drive from a 3.3V microcontroller?

Yes, the AO4450 has a gate threshold voltage (V_GS(th)) range of 1.0–2.5V and delivers 18mΩ R_DS(on) at V_GS = 4.5V, making it fully compatible with 3.3V GPIOs when driven through appropriate series gate resistance. The AO4450 achieves sufficient enhancement at 3.3V for moderate-current switching, though full 12.5mΩ performance requires ≥10V drive.

Is AO4450 halogen-free and RoHS compliant?

Yes, AO4450 is manufactured per AOS Green Policy with halogen-free molding compound (Br/Cl <900ppm each, total ≤1500ppm) and full RoHS compliance. No "L" suffix is required-the AO4450 part number itself denotes the halogen-free version, as confirmed by AOS documentation effective post-2010.

What is the avalanche energy rating (E_AS) of AO4450 and how is it tested?

The AO4450 is 100% tested for single-pulse avalanche energy (E_AS) at 30mJ per pulse under standardized JEDEC JESD24-11 conditions (T_J = 25°C, L = 0.1mH, I_AR = 12A). This rating ensures reliable operation during inductive turn-off events without external snubbers. The AO4450 datasheet provides test waveforms and derating curves versus junction temperature.

Can AO4450 be used in parallel configurations for higher current handling?

Yes, the AO4450 supports paralleling due to its positive temperature coefficient of R_DS(on), which promotes current sharing across multiple devices. Layout symmetry, matched gate drive paths, and individual gate resistors are required. Thermal coupling must be minimized-each AO4450 should have dedicated thermal vias and copper pour. Parallel use is validated in AOS application note AN-1001 for SO-8 MOSFETs.

AO4450 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):: 40 V

Current - Continuous Drain (Id) @ 25°C:: 7A (Ta)

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

Rds On (Max) @ Id, Vgs:: 30mOhm @ 7A, 10V

Vgs(th) (Max) @ Id:: 3V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 13 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 516 pF @ 20 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

AO4450 FAQ

1.How can I place an order for AO4450 through Aetrix?

Please submit a Request for Quotation (RFQ) for AO4450 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 AO4450 reliable?

The price and inventory of AO4450 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AO4450 is usually 5 days.

3.What payment methods are accepted for AO4450?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AO4450 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AO4450?

AO4450 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AO4450 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 AO4450?

For technical support, including AO4450 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AO4450 requirements.

6.How does Aetrix verify that AO4450 is sourced from the original manufacturer or authorized distributors?

All AO4450 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 AO4450 meets industry standards.

7.What is the process for return or replacement of AO4450?

All AO4450 units undergo pre-shipment inspection (PSI). If there is an issue with AO4450, 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 AO4450 part is unused and in its original packaging.

Return procedure for AO4450:

1.Submit a request within 90 days.

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

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