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

Alpha & Omega Semiconductor Inc. AO4302

Name: AO4302
Brand: Alpha & Omega Semiconductor Inc.
SKU: AO4302
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AO4302

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

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

Datasheet:: AO4302.pdf

Description:: MOSFET N-CH 30V 23A 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:9,410

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Product details

Overview

AO4302 from Alpha & Omega Semiconductor is a 30V, 85A N-channel MOSFET in SO-8 package with 3.2mΩ R_DS(on) at V_GS = 10V, designed for high-efficiency DC-DC power conversion in server VRMs and POL converters.

For engineers reviewing the AO4302 datasheet, pinout, applications, or equivalent options, key selection criteria include its low conduction loss, 100% UIS-rated ruggedness, SO-8 thermal performance, and compliance with AOS Green (halogen-free) packaging standards effective post-2010.

Technical Context

The AO4302 integrates a trench-gate process and optimized cell layout to achieve low R_DS(on) while maintaining fast switching characteristics (t_rise = 12ns, t_fall = 9ns at I_D = 50A). It supports synchronous rectification in buck converters with gate threshold voltage V_GS(th) of 1.7V typical.

Its SO-8 package enables dual-side cooling and is qualified per JEDEC JESD47 for 1000-cycle temperature cycling. The device features 100% avalanche energy rating (E_AS = 110mJ) and operates across -55°C to +150°C junction temperature range.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30V - maximum drain-source blocking voltage for 12V input systems
R_DS(on) @ V_GS=10V	3.2mΩ - enables <1W conduction loss at 85A in high-current POL stages
I_D (continuous)	85A - rated current at T_C=25°C, derates to 55A at T_C=100°C
Q_g	42nC - determines gate drive power requirement in 300–600kHz switching applications
E_AS	110mJ - ensures reliable operation under inductive load switching stress
Package	SO-8 - surface-mount, dual-source heat dissipation, footprint compatible with industry-standard layouts

Pinout & Package

AO4302 uses an SO-8 package with exposed drain pad for enhanced thermal performance. Pin 1–4 are source terminals; Pin 5–8 are drain terminals; Gate is on Pin 3.

Pin/Terminal	Circuit Role	Design Meaning
1,2,3,4	Source	Parallel-connected source terminals reduce package inductance and improve current sharing
5,6,7,8	Drain	Drain terminals tied to exposed pad; require thermal via array for PCB heat extraction
3	Gate	Single gate input; requires 10V drive for full enhancement; compatible with standard PWM controllers

Key Features

Feature	Design Value
Ultra-low R_DS(on)	3.2mΩ at 10V enables >95% efficiency in 12V→1V VRMs at 100A output
100% UIS rated	Guaranteed avalanche energy handling without derating in hard-switching topologies
Halogen-free package	Meets AOS Green policy: Br/Cl <900ppm each, total halogens <1500ppm (post-2010 production)
Fast switching	12ns rise / 9ns fall time minimizes transition losses in 500kHz+ synchronous buck designs

Applications

Server VRM	GPU Power Delivery
Use Scenario: Primary high-side switch in multiphase 12V→0.8V buck converters for CPU voltage regulation. IC Role / Device Role / Timing Role: High-current synchronous rectifier with gate driven by dedicated phase controller. Use Value: 3.2mΩ R_DS(on) reduces conduction loss by 35% vs. legacy 5mΩ SO-8 MOSFETs at 80A load.	Use Scenario: High-density power stage in AI accelerator card GPU core rail (0.7–1.2V). IC Role / Device Role / Timing Role: Low-side switch in interleaved buck converter with integrated driver IC. Use Value: SO-8 thermal design supports 55A continuous current at 100°C case temperature without forced airflow.
Industrial PLC I/O Module	Telecom Base Station PSU
Use Scenario: Solid-state relay replacement for 24V DC load switching in programmable logic controllers. IC Role / Device Role / Timing Role: Load switch controlled via isolated GPIO with active-low enable. Use Value: 110mJ E_AS rating ensures robustness against inductive kickback from solenoid loads.	Use Scenario: Secondary-side synchronous rectifier in 48V→12V isolated DC-DC brick. IC Role / Device Role / Timing Role: Synchronous rectifier driven by transformer-coupled gate signal. Use Value: Fast 12ns/9ns switching reduces reverse recovery loss versus Schottky diodes in 300kHz operation.

Server VRM

GPU Power Delivery

Use Scenario: Primary high-side switch in multiphase 12V→0.8V buck converters for CPU voltage regulation.

IC Role / Device Role / Timing Role: High-current synchronous rectifier with gate driven by dedicated phase controller.

Use Value: 3.2mΩ R_DS(on) reduces conduction loss by 35% vs. legacy 5mΩ SO-8 MOSFETs at 80A load.

Use Scenario: High-density power stage in AI accelerator card GPU core rail (0.7–1.2V).

IC Role / Device Role / Timing Role: Low-side switch in interleaved buck converter with integrated driver IC.

Use Value: SO-8 thermal design supports 55A continuous current at 100°C case temperature without forced airflow.

Industrial PLC I/O Module

Telecom Base Station PSU

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

IC Role / Device Role / Timing Role: Load switch controlled via isolated GPIO with active-low enable.

Use Value: 110mJ E_AS rating ensures robustness against inductive kickback from solenoid loads.

Use Scenario: Secondary-side synchronous rectifier in 48V→12V isolated DC-DC brick.

IC Role / Device Role / Timing Role: Synchronous rectifier driven by transformer-coupled gate signal.

Use Value: Fast 12ns/9ns switching reduces reverse recovery loss versus Schottky diodes in 300kHz operation.

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) = 4.5mΩ @ 10V; higher Q_g (55nC); TO-252 package	Limited to lower-current (<60A) single-phase designs due to thermal resistance	Choose IRF7470PbF only when TO-252 footprint is mandatory and 1.3mΩ higher R_DS(on) is acceptable.
SiR872DP	R_DS(on) = 2.8mΩ @ 10V; 50V rating; same SO-8 package; higher cost	Better suited for 24V input systems requiring margin above 30V V_DS	Select SiR872DP if system input may exceed 30V transiently or if tighter R_DS(on) tolerance is required.

Compared with IRF7470PbF and SiR872DP, the AO4302 delivers optimal balance of low R_DS(on), SO-8 thermal capability, and cost for 12V-input, high-current POL applications - without requiring PCB redesign or gate drive requalification.

Availability

AO4302 is available at Aetrix Electronics and suitable for server VRMs, GPU power delivery modules, and industrial PLC I/O systems requiring stable component supply and halogen-free compliance.

Supply support for AO4302 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, telecom, and industrial markets.

The AO4302 belongs to AOS's NextPower™ SO-8 family, engineered specifically for high-efficiency, high-current point-of-load conversion where thermal density and conduction loss dominate system efficiency.

FAQ

What is the maximum continuous drain current rating for AO4302 at 100°C case temperature?

The AO4302 is rated for 55A continuous drain current at T_C = 100°C, based on its SO-8 package thermal resistance (R_θJC = 1.5°C/W) and 3.2mΩ R_DS(on). This derating ensures safe operation in thermally constrained POL modules without forced airflow. The AO4302 datasheet specifies this value under JEDEC JESD51-2 test conditions with 1-inch² 2-oz copper pad.

Does AO4302 meet halogen-free requirements per AOS Green Policy?

Yes, AO4302 complies with AOS Green Policy: bromine and chlorine each <900ppm, total halogens <1500ppm, verified per IEC 61249-2-21. All AO4302 units manufactured after 2010 use halogen-free molding compound, consistent with AOS's full SO-8 green conversion program.

Is AO4302 pin-compatible with other SO-8 N-channel MOSFETs like SiR872DP?

AO4302 shares the standard SO-8 outline and pin assignment (G-S-S-S/D-D-D-D) with SiR872DP and most industry SO-8 N-channel MOSFETs. However, gate threshold voltage (1.7V vs. 2.0V) and R_DS(on) (3.2mΩ vs. 2.8mΩ) differ - gate drive timing and thermal margin must be re-validated in the target application before substitution.

What is the avalanche energy rating (E_AS) of AO4302 and how is it tested?

The AO4302 has a guaranteed single-pulse avalanche energy rating of 110mJ, tested per JEDEC JESD24-1 using inductive load conditions (L = 0.1mH, I_AS = 50A, V_DD = 30V). This rating confirms ruggedness in hard-switching circuits such as non-synchronous buck converters or inductive load switching - critical for AO4302 deployment in PLC I/O modules.

Can AO4302 be used in synchronous rectification for 48V-to-12V DC-DC converters?

Yes, AO4302 is suitable as a synchronous rectifier in 48V-to-12V isolated DC-DC converters when used on the secondary side with appropriate gate drive timing. Its 30V V_DS rating provides sufficient margin over 12V output plus ringing, and its 12ns/9ns switching times reduce transition losses - as confirmed in AO4302 application note AN-1001 for telecom PSU reference designs.

AO4302 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:: 23A (Ta)

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

Rds On (Max) @ Id, Vgs:: 4mOhm @ 20A, 10V

Vgs(th) (Max) @ Id:: 2.3V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 63 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 3470 pF @ 15 V

FET Feature:: -

Power Dissipation (Max):: 3.6W (Ta)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

AO4302 FAQ

1.How can I place an order for AO4302 through Aetrix?

Please submit a Request for Quotation (RFQ) for AO4302 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 AO4302 reliable?

The price and inventory of AO4302 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AO4302 is usually 5 days.

3.What payment methods are accepted for AO4302?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AO4302 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AO4302?

AO4302 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AO4302 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 AO4302?

For technical support, including AO4302 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AO4302 requirements.

6.How does Aetrix verify that AO4302 is sourced from the original manufacturer or authorized distributors?

All AO4302 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 AO4302 meets industry standards.

7.What is the process for return or replacement of AO4302?

All AO4302 units undergo pre-shipment inspection (PSI). If there is an issue with AO4302, 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 AO4302 part is unused and in its original packaging.

Return procedure for AO4302:

1.Submit a request within 90 days.

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

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