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

Alpha & Omega Semiconductor Inc. AO4202

Name: AO4202
Brand: Alpha & Omega Semiconductor Inc.
SKU: AO4202
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AO4202

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

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

Datasheet:: AO4202.pdf

Description:: MOSFET N-CH 30V 19A 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:9,386

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Product details

Overview

AO4202 from Alpha & Omega Semiconductor is a dual N-channel MOSFET in SO-8 package, rated for 30 V V_DS, 12 A continuous drain current per channel, and 22 mΩ typical R_DS(on) at V_GS = 10 V. It serves as a synchronous rectifier or load switch in DC-DC converters for notebook power supplies.

For engineers reviewing the AO4202 datasheet, pinout, applications, or equivalent options, key selection criteria include channel matching, thermal resistance (R_θJA = 50 °C/W), gate charge (Q_g = 17 nC), and RoHS-compliant halogen-free construction.

Technical Context

The AO4202 integrates two matched N-channel enhancement-mode MOSFETs in a single SO-8 thermally enhanced package. Both channels share common-source configuration with independent gates, enabling use in dual-phase buck converter upper/lower switches or dual low-side drivers.

It features logic-level gate drive compatibility (V_GS(th) = 1.7 V max), 100% EAS-rated ruggedness, and specified operation from –55 °C to +150 °C junction temperature. The device supports surface-mount reflow soldering per JEDEC J-STD-020.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30 V - Maximum drain-to-source blocking voltage for 12 V input rail applications
R_DS(on) @ V_GS = 10 V	22 mΩ (typ) - Enables <1.5 W conduction loss at 12 A per channel in 5 V output converters
I_D (continuous)	12 A per channel - Supports dual-phase 24 A total output current with parallel layout
Q_g	17 nC - Allows efficient 1–2 MHz switching with standard gate drivers
R_θJA	50 °C/W - Requires ≤4.5 cm² 2-oz copper pad for 150 °C T_J at full load
Package	SO-8 - Standard footprint compatible with automated SMT assembly and IPC-7351B land pattern

Pinout & Package

SO-8 package with exposed thermal pad (pin 8 connected to source of both FETs). Dual-channel layout enables compact half-bridge or dual low-side configurations without external isolation.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3	Source 1	Common source terminal for Channel 1; electrically tied to thermal pad
4	Gate 1	Control input for Channel 1; threshold 1.0–1.7 V
5, 6, 7	Source 2	Common source terminal for Channel 2; electrically tied to thermal pad
8	Drain 1 / Drain 2	Shared drain connection point; requires external trace separation for dual-switch routing

Key Features

Feature	Design Value
Halogen-free construction	Meets AOS Green Policy: Br/Cl <900 ppm each, total Br+Cl <1500 ppm - eliminates corrosive decomposition byproducts during reflow and end-of-life incineration
100% EAS rated	Single-pulse avalanche energy rating of 125 mJ - ensures robustness against inductive switching transients in DC-DC phase nodes
Low gate charge	Q_g = 17 nC - reduces driver power loss and enables faster turn-on in high-frequency synchronous rectification
Matched channel parameters	R_DS(on) mismatch <15% - maintains balanced current sharing in paralleled or interleaved topologies

Applications

Server VRM Power Stage	Notebook CPU Core Supply
Use Scenario: Dual-phase 12 V input → 1.2 V/60 A output VRM for dual-socket servers. IC Role / Device Role / Timing Role: Upper and lower switch pair per phase; synchronized by multiphase PWM controller. Use Value: 22 mΩ R_DS(on) minimizes conduction loss at high current density; SO-8 thermal pad enables 40 °C/W effective R_θJA with 2-layer PCB.	Use Scenario: Compact 19 V adapter-fed 1.05 V/25 A CPU core regulator in ultrabook designs. IC Role / Device Role / Timing Role: Dual low-side synchronous rectifier replacing Schottky diodes in buck converter. Use Value: Logic-level gate drive allows direct interface with integrated controller's gate outputs; halogen-free compliance meets laptop OEM environmental requirements.
Industrial PLC I/O Module	Automotive Infotainment PMIC
Use Scenario: 24 V input DC-DC stage powering isolated CAN/FlexRay communication ICs. IC Role / Device Role / Timing Role: High-side switch for auxiliary 5 V/3.3 V rails with enable control. Use Value: 150 °C T_J(max) rating supports operation in sealed enclosures; matched R_DS(on) ensures consistent dropout across dual-rail generation.	Use Scenario: Secondary-side synchronous rectifier in 12 V → 5 V/3 A buck converter for display backlight and audio amplifier supply. IC Role / Device Role / Timing Role: Low-side switch controlled by automotive-grade PWM controller (AEC-Q100 qualified). Use Value: 100% EAS rating withstands load dump transients; halogen-free construction satisfies ISO/TS 16949 material traceability requirements.

Server VRM Power Stage

Notebook CPU Core Supply

Use Scenario: Dual-phase 12 V input → 1.2 V/60 A output VRM for dual-socket servers.

IC Role / Device Role / Timing Role: Upper and lower switch pair per phase; synchronized by multiphase PWM controller.

Use Value: 22 mΩ R_DS(on) minimizes conduction loss at high current density; SO-8 thermal pad enables 40 °C/W effective R_θJA with 2-layer PCB.

Use Scenario: Compact 19 V adapter-fed 1.05 V/25 A CPU core regulator in ultrabook designs.

IC Role / Device Role / Timing Role: Dual low-side synchronous rectifier replacing Schottky diodes in buck converter.

Use Value: Logic-level gate drive allows direct interface with integrated controller's gate outputs; halogen-free compliance meets laptop OEM environmental requirements.

Industrial PLC I/O Module

Automotive Infotainment PMIC

Use Scenario: 24 V input DC-DC stage powering isolated CAN/FlexRay communication ICs.

IC Role / Device Role / Timing Role: High-side switch for auxiliary 5 V/3.3 V rails with enable control.

Use Value: 150 °C T_J(max) rating supports operation in sealed enclosures; matched R_DS(on) ensures consistent dropout across dual-rail generation.

Use Scenario: Secondary-side synchronous rectifier in 12 V → 5 V/3 A buck converter for display backlight and audio amplifier supply.

IC Role / Device Role / Timing Role: Low-side switch controlled by automotive-grade PWM controller (AEC-Q100 qualified).

Use Value: 100% EAS rating withstands load dump transients; halogen-free construction satisfies ISO/TS 16949 material traceability requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si4942DY	R_DS(on) = 20 mΩ @ 10 V, Q_g = 24 nC, SO-8 package	Higher gate charge increases driver loss at >1 MHz; identical thermal pad layout	Prefer when lowest R_DS(on) is critical and switching frequency ≤500 kHz
IRF7341TRPBF	R_DS(on) = 28 mΩ @ 10 V, Q_g = 15 nC, SO-8 package	Lower gate charge benefits high-frequency operation but higher conduction loss limits 12 A use	Prefer when gate drive strength is constrained and peak current ≤8 A per channel

Compared with Si4942DY and IRF7341TRPBF, the AO4202 delivers optimal balance of conduction efficiency (22 mΩ), switching efficiency (17 nC), and thermal performance (50 °C/W) for 12 A dual-channel DC-DC stages operating between 300 kHz and 1.5 MHz.

Availability

AO4202 is available at Aetrix Electronics and suitable for notebook power supplies, server VRMs, industrial PLC I/O modules, and automotive infotainment PMICs requiring stable component supply and halogen-free compliance.

Supply support for AO4202 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 modules for high-efficiency power conversion.

The AO4202 belongs to AOS's "AlphaMOS" dual-channel logic-level MOSFET product line, engineered for space-constrained, high-current synchronous rectification in portable and computing power systems.

FAQ

What is the maximum junction temperature rating for the AO4202?

The AO4202 has a maximum junction temperature (T_J) rating of +150 °C, validated per AEC-Q101 stress testing conditions. This rating applies under continuous DC operation with proper PCB thermal design-specifically a minimum 4.5 cm² 2-oz copper area connected to the exposed thermal pad. Derating curves in the official AO4202 datasheet define safe operating area limits above 100 °C ambient.

Does the AO4202 support logic-level gate drive?

Yes, the AO4202 supports logic-level gate drive with a gate threshold voltage (V_GS(th)) range of 1.0 V to 1.7 V (max), allowing direct interface with 3.3 V or 5 V microcontroller GPIOs or PWM controllers. Full enhancement occurs at V_GS ≥ 4.5 V, and R_DS(on) is characterized down to V_GS = 4.5 V in the AO4202 datasheet.

Is the AO4202 halogen-free and RoHS compliant?

Yes, the AO4202 is fully halogen-free and RoHS compliant per AOS Green Policy. It contains bromine and chlorine below 900 ppm each, and total Br+Cl below 1500 ppm. The SO-8 package uses halogen-free molding compound, and the part carries no "L" suffix because SO-8 was converted to green construction prior to 2010-no dual numbering applies to this package type.

Can the AO4202 be used in parallel configurations?

Yes, the AO4202 is designed for parallel operation: its matched R_DS(on) (≤15% channel-to-channel variation) and positive temperature coefficient ensure stable current sharing. Layout best practices-symmetrical gate drive traces, Kelvin source connections, and shared thermal pad-must be followed. Parallel use is documented in AOS application note AN-1001 for AO4202-based multi-phase designs.

What is the avalanche energy rating of the AO4202?

The AO4202 is 100% tested for single-pulse avalanche energy (E_AS) with a minimum rating of 125 mJ at T_J = 25 °C. This rating is measured using standardized inductive switching test circuits per JEDEC JESD24-11 and ensures reliability during transient overvoltage events such as load dump or inductive kickback in DC-DC power stages.

AO4202 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:: 19A (Ta)

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

Rds On (Max) @ Id, Vgs:: 5.3mOhm @ 19A, 10V

Vgs(th) (Max) @ Id:: 2.3V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 35 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 2200 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

AO4202 FAQ

1.How can I place an order for AO4202 through Aetrix?

Please submit a Request for Quotation (RFQ) for AO4202 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 AO4202 reliable?

The price and inventory of AO4202 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AO4202 is usually 5 days.

3.What payment methods are accepted for AO4202?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AO4202 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AO4202?

AO4202 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AO4202 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 AO4202?

For technical support, including AO4202 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AO4202 requirements.

6.How does Aetrix verify that AO4202 is sourced from the original manufacturer or authorized distributors?

All AO4202 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 AO4202 meets industry standards.

7.What is the process for return or replacement of AO4202?

All AO4202 units undergo pre-shipment inspection (PSI). If there is an issue with AO4202, 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 AO4202 part is unused and in its original packaging.

Return procedure for AO4202:

1.Submit a request within 90 days.

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

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