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

Alpha & Omega Semiconductor Inc. AO4296

Name: AO4296
Brand: Alpha & Omega Semiconductor Inc.
SKU: AO4296
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AO4296

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

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

Datasheet:: AO4296.pdf

Description:: MOSFET N-CH 100V 13.5A 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AO4296 from Alpha & Omega Semiconductor is a 100V N-Channel Trench Power MOSFET using AlphaSGT™ technology, designed for high-efficiency synchronous rectification in AC/DC quick chargers. It delivers 13.5A continuous drain current at V_GS=10V, <8.3mΩ R_DS(ON) at 10V, and <10.6mΩ at 4.5V, with low gate charge (Q_g=42–60nC) and 100% UIS-tested ruggedness.

For engineers reviewing the AO4296 datasheet, pinout, applications, or equivalent options, key selection criteria include its SO-8 package thermal performance (R_θJA=75°C/W), body-diode reverse recovery characteristics (t_rr=28ns, Q_rr=130nC), and verified suitability for high-frequency switching in compact USB PD adapters.

Technical Context

The AO4296 employs AlphaSGT™ trench-gate silicon technology to achieve low conduction loss and fast switching dynamics. Its optimized cell structure supports high current density while maintaining robust avalanche capability (E_AS=54mJ) and low gate resistance (R_g=0.7–2.1Ω).

Designed for unidirectional power flow in secondary-side synchronous rectification, it features a low V_SD body diode (0.7–1.0V at 1A) and tight V_GS(th) distribution (1.3–2.3V), enabling reliable turn-on control with standard 4.5V logic-level gate drivers.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	100V - supports input voltage derating up to 80V DC bus in 24W–65W USB PD chargers
I_D (V_GS=10V)	13.5A - enables single-device operation in ≤65W synchronous rectifier designs
R_DS(ON) (V_GS=10V)	<8.3mΩ - reduces conduction loss to <1.1W at 13.5A, critical for thermally constrained adapters
R_DS(ON) (V_GS=4.5V)	<10.6mΩ - ensures stable on-state performance with 5V gate drive from PWM controllers
Q_g (10V)	42–60nC - minimizes gate drive power and enables >300kHz switching without excessive driver loss
t_rr / Q_rr	28ns / 130nC - limits reverse recovery loss and EMI during hard-switched transitions
R_θJA	75°C/W - requires ≥1in² 2oz copper pad for safe operation at full load in SO-8 footprint

Pinout & Package

AO4296 is housed in a standard SOIC-8 (SO-8) surface-mount package with exposed drain pads on pins 1–4 and 6–8, source terminals on pins 5 and 6, and gate on pin 3. Thermal performance relies on PCB copper area connected to drain pins.

Pin/Terminal	Circuit Role	Design Meaning
1,2,3,4,6,7,8	Drain (D)	Parallel-connected high-current output path; electrically and thermally tied to internal die drain
5,6	Source (S)	Return path for load current; pin 6 shared drain/source connection used for Kelvin sensing in some layouts
3	Gate (G)	Control terminal requiring <60nC total charge; isolated from power paths to minimize coupling noise

Key Features

Feature	Design Value
AlphaSGT™ trench technology	Enables <8.3mΩ R_DS(ON) in SO-8 without die size penalty, improving power density vs. planar MOSFETs
100% UIS tested	Guarantees minimum 54mJ single-pulse avalanche energy, eliminating need for external snubbers in inductive loads
Low Q_gd/Q_g ratio	4.5nC/42nC ≈ 10.7% - suppresses Miller-induced shoot-through in synchronous buck rectifiers
RoHS & halogen-free	Meets IPC-J-STD-609 Class 1 moisture sensitivity and JEDEC MSL-1 reflow requirements for automated assembly
Body diode t_rr specification	28ns max at IF=13.5A - enables clean commutation in CCM flyback and LLC resonant converters

Applications

USB PD Quick Charger Secondary Side	High-Density AC/DC Adapter
Use Scenario: 65W USB-C power adapter operating at 100–300kHz with synchronous rectification in flyback topology. IC Role / Device Role / Timing Role: Low-side synchronous rectifier replacing Schottky diode; driven by transformer-coupled or controller-based gate signal. Use Value: Reduces conduction loss by >40% vs. 100V Schottky, enabling >94% efficiency and 25°C lower MOSFET junction temperature at full load.	Use Scenario: Compact 24W wall adapter with minimal PCB area and no heatsink. IC Role / Device Role / Timing Role: Primary-side active clamp switch or secondary-side rectifier in quasi-resonant flyback. Use Value: SO-8 footprint supports automated placement; R_θJA=75°C/W allows full 13.5A rating with only 1in² 2oz copper, eliminating discrete thermal vias.
Industrial 24V DC-DC Converter	USB-C Power Delivery Ecosystem
Use Scenario: 24V input, 5V/12A isolated DC-DC module for PoE-powered devices. IC Role / Device Role / Timing Role: Synchronous rectifier in secondary winding of center-tapped forward converter. Use Value: Low R_DS(ON) at 4.5V gate drive ensures stable on-resistance across industrial temperature range (−40°C to +125°C).	Use Scenario: Multi-port USB-C charger supporting simultaneous 20V/3A and 9V/3A outputs. IC Role / Device Role / Timing Role: Dual-channel synchronous rectifier per output rail, sharing common ground and thermal pad. Use Value: Matched R_DS(ON) and Q_g across units ensures balanced current sharing and eliminates need for per-rail current sensing.

USB PD Quick Charger Secondary Side

High-Density AC/DC Adapter

Use Scenario: 65W USB-C power adapter operating at 100–300kHz with synchronous rectification in flyback topology.

IC Role / Device Role / Timing Role: Low-side synchronous rectifier replacing Schottky diode; driven by transformer-coupled or controller-based gate signal.

Use Value: Reduces conduction loss by >40% vs. 100V Schottky, enabling >94% efficiency and 25°C lower MOSFET junction temperature at full load.

Use Scenario: Compact 24W wall adapter with minimal PCB area and no heatsink.

IC Role / Device Role / Timing Role: Primary-side active clamp switch or secondary-side rectifier in quasi-resonant flyback.

Use Value: SO-8 footprint supports automated placement; R_θJA=75°C/W allows full 13.5A rating with only 1in² 2oz copper, eliminating discrete thermal vias.

Industrial 24V DC-DC Converter

USB-C Power Delivery Ecosystem

Use Scenario: 24V input, 5V/12A isolated DC-DC module for PoE-powered devices.

IC Role / Device Role / Timing Role: Synchronous rectifier in secondary winding of center-tapped forward converter.

Use Value: Low R_DS(ON) at 4.5V gate drive ensures stable on-resistance across industrial temperature range (−40°C to +125°C).

Use Scenario: Multi-port USB-C charger supporting simultaneous 20V/3A and 9V/3A outputs.

IC Role / Device Role / Timing Role: Dual-channel synchronous rectifier per output rail, sharing common ground and thermal pad.

Use Value: Matched R_DS(ON) and Q_g across units ensures balanced current sharing and eliminates need for per-rail current sensing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Infineon IPP040N10N5	100V, 40A, R_DS(ON)=3.8mΩ @10V, PG-TDSON-8 package (larger footprint)	Higher current rating suits higher-power designs but requires PCB redesign	Select when >20A peak current or lower R_DS(ON) is required; not drop-in due to different package and pinout
Vishay SI7850DP	100V, 12A, R_DS(ON)=9.5mΩ @10V, SO-8, Q_g=48nC	Near-identical SO-8 footprint and gate drive compatibility	Valid alternative for space-constrained 65W designs where 1.2mΩ higher R_DS(ON) is acceptable

Compared with IPP040N10N5 and SI7850DP, the AO4296 offers the best balance of SO-8 compatibility, 13.5A rating, and sub-10mΩ R_DS(ON), making it optimal for cost-sensitive, thermally constrained USB PD secondary-side rectification without layout change.

Availability

AO4296 is available at Aetrix Electronics and suitable for USB PD quick chargers, high-density AC/DC adapters, and industrial DC-DC converters requiring stable component supply and consistent SO-8 thermal performance.

Supply support for AO4296 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, consumer, and industrial markets.

The AO4296 belongs to AOS's AlphaSGT™ low-R_DS(ON) MOSFET product line, engineered specifically for high-frequency, high-efficiency synchronous rectification in compact power supplies.

FAQ

What is the maximum continuous drain current rating for AO4296 at 100°C case temperature?

The AO4296 supports 10.5A continuous drain current at T_A=70°C (derated from 13.5A at 25°C), and its absolute maximum I_D remains limited by package thermal resistance and junction temperature. At 100°C ambient, sustained operation requires active cooling or reduced duty cycle to maintain T_J ≤150°C. The AO4296 datasheet specifies 10.5A as the steady-state rating at T_A=70°C, not 100°C.

Does AO4296 support 5V gate drive in synchronous rectifier applications?

Yes, the AO4296 is fully specified for 4.5V gate drive, with R_DS(ON) <10.6mΩ at V_GS=4.5V and I_D=11.5A. Its gate threshold voltage (V_GS(th)) ranges from 1.3V to 2.3V, ensuring strong enhancement-mode turn-on with standard 5V logic-level controllers. The AO4296 has been validated in production 5V-driven USB PD secondary-side circuits.

Is AO4296 pin-compatible with other SO-8 N-Channel MOSFETs like AO3400?

No, the AO4296 uses a dual-drain SO-8 configuration (pins 1–4 and 6–8 as Drain, pin 5 and 6 as Source, pin 3 as Gate), whereas AO3400 follows standard SO-8 pinout (Drain on pins 1–3, Source on 5–7, Gate on 2). The AO4296 pinout is specific to high-current SO-8 variants and is not interchangeable with general-purpose SO-8 MOSFETs without PCB revision.

What is the body diode forward voltage of AO4296 at 1A and 25°C?

The AO4296 body diode forward voltage is specified as 0.7V minimum and 1.0V maximum at I_S=1A and T_J=25°C. This low V_SD improves light-load efficiency in discontinuous conduction mode (DCM) and reduces reverse recovery stress. The AO4296's body diode is characterized across temperature, with V_SD decreasing slightly at higher junction temperatures.

How is avalanche ruggedness verified for AO4296?

The AO4296 undergoes 100% Unclamped Inductive Switching (UIS) testing per JEDEC JESD22-A116, with guaranteed minimum single-pulse avalanche energy of 54mJ at T_J=25°C. Each device is tested at rated V_DS=100V and I_AS=10.5A, ensuring robustness against inductive transients in flyback and forward converters. The AO4296's UIS rating is documented in its official datasheet Rev.2.0.

AO4296 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: AlphaSGT™

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):: 100 V

Current - Continuous Drain (Id) @ 25°C:: 13.5A (Ta)

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

Rds On (Max) @ Id, Vgs:: 8.3mOhm @ 13.5A, 10V

Vgs(th) (Max) @ Id:: 2.3V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 60 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 3130 pF @ 50 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

AO4296 FAQ

1.How can I place an order for AO4296 through Aetrix?

Please submit a Request for Quotation (RFQ) for AO4296 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 AO4296 reliable?

The price and inventory of AO4296 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AO4296 is usually 5 days.

3.What payment methods are accepted for AO4296?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AO4296 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AO4296?

AO4296 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AO4296 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 AO4296?

For technical support, including AO4296 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AO4296 requirements.

6.How does Aetrix verify that AO4296 is sourced from the original manufacturer or authorized distributors?

All AO4296 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 AO4296 meets industry standards.

7.What is the process for return or replacement of AO4296?

All AO4296 units undergo pre-shipment inspection (PSI). If there is an issue with AO4296, 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 AO4296 part is unused and in its original packaging.

Return procedure for AO4296:

1.Submit a request within 90 days.

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

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