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

Alpha & Omega Semiconductor Inc. AO4498

Name: AO4498
Brand: Alpha & Omega Semiconductor Inc.
SKU: AO4498
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AO4498

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

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

Datasheet:: AO4498.pdf

Description:: MOSFET N CH 30V 18A 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:6,174

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Product details

Overview

AO4498 from Alpha & Omega Semiconductor is a 30V N-channel enhancement-mode MOSFET in SOIC-8 package, featuring R_DS(ON) < 5.5 mΩ at V_GS = 10 V and 18 A continuous drain current. It integrates 100% UIS and 100% R_g testing, optimized for high-efficiency load switching and battery protection circuits in portable power systems.

For engineers reviewing the AO4498 datasheet, pinout, applications, or equivalent options, key selection criteria include its low on-resistance at 4.5 V gate drive, robust avalanche energy rating (88 mJ), thermal resistance (R_θJA = 40 °C/W), and SOIC-8 footprint compatibility with space-constrained DC-DC and power management designs.

Technical Context

The AO4498 employs advanced trench-gate silicon process to achieve sub-6 mΩ R_DS(ON) at 10 V drive while maintaining V_GS(th) of 1.3–2.5 V and gate charge Q_g(10V) = 37–44.5 nC. Its body diode exhibits t_rr = 14–17 ns and Q_rr = 40 nC under IF = 18 A, dI/dt = 500 A/μs conditions.

Designed for unidirectional high-current switching, the device supports pulsed drain current up to 59 A and operates across –55 °C to +150 °C junction temperature range. Its SOIC-8 leadframe construction enables direct thermal coupling to PCB copper, supporting PD = 3.1 W at T_C = 25 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30 V - Maximum blocking voltage for 12–24 V rail applications
I_D (continuous)	18 A @ T_C = 25 °C - Supports high-current load switches without heatsinking
R_DS(ON)	< 5.5 mΩ @ V_GS = 10 V - Minimizes conduction loss in battery-fed systems
Q_g(10V)	37–44.5 nC - Enables fast switching with moderate gate driver strength
E_AR	88 mJ - Withstands repetitive inductive energy spikes in motor or solenoid drives
R_θJA	40 °C/W - Validated on 1 in² FR-4 board with 2 oz copper; guides thermal layout
t_rr	14–17 ns - Reduces body-diode recovery loss in synchronous rectification

Pinout & Package

AO4498 is housed in a standard SOIC-8 surface-mount package with exposed drain pad for enhanced thermal performance. Pin numbering follows JEDEC MS-012, with pins 1–4 and 5–8 forming dual-source/drain parallel configurations.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4	Source	Common source terminals; internally paralleled for low-inductance, high-current return path
5, 6, 7, 8	Drain	Common drain terminals; connected to exposed pad for thermal and current conduction
G (Pin 3)	Gate	Single gate input; requires <2.5 V threshold for logic-level drive compatibility

Key Features

Feature	Design Value
100% UIS tested	Guarantees ruggedness against unclamped inductive switching stress in real-world loads
R_DS(ON) < 7.5 mΩ @ 4.5 V	Enables full enhancement with 3.3 V or 5 V microcontroller GPIO drive
Low Q_gd/Q_g ratio (≈0.25)	Improves Miller immunity and reduces switching instability in high-dV/dt environments
Exposed drain pad	Provides direct thermal path to PCB ground plane, lowering R_θJA by up to 30%

Applications

Battery Protection Circuit	Load Switch for Portable Devices
Use Scenario: Reverse-polarity and overcurrent protection in 2-cell Li-ion battery packs. IC Role / Device Role / Timing Role: Primary N-channel high-side switch controlling battery discharge path. Use Value: Sub-6 mΩ R_DS(ON) limits voltage drop to <100 mV at 16 A, preserving runtime and enabling accurate current sensing.	Use Scenario: Controlled power-up sequencing for USB-C PD accessories and wearables. IC Role / Device Role / Timing Role: Low-loss, logic-level–driven load switch isolating downstream rails. Use Value: Gate threshold of 1.3–2.5 V ensures reliable turn-on with 3.3 V MCU outputs; fast 8.1 ns t_D(on) supports precise timing control.
DC-DC Synchronous Rectifier	Motor Driver Half-Bridge Leg
Use Scenario: Secondary-side rectification in isolated 5–12 V flyback converters. IC Role / Device Role / Timing Role: Low-V_F body diode and fast t_rr enable efficient synchronous rectification. Use Value: Body diode V_SD = 0.7–1.0 V and t_rr = 14–17 ns reduce reverse-recovery loss versus Schottky alternatives.	Use Scenario: Low-side switch in brushed DC motor drivers for robotics and power tools. IC Role / Device Role / Timing Role: High-current, avalanche-rated switch handling commutation transients. Use Value: 88 mJ E_AR and 59 A I_DM support repeated inductive kickback without derating.

Battery Protection Circuit

Load Switch for Portable Devices

Use Scenario: Reverse-polarity and overcurrent protection in 2-cell Li-ion battery packs.

IC Role / Device Role / Timing Role: Primary N-channel high-side switch controlling battery discharge path.

Use Value: Sub-6 mΩ R_DS(ON) limits voltage drop to <100 mV at 16 A, preserving runtime and enabling accurate current sensing.

Use Scenario: Controlled power-up sequencing for USB-C PD accessories and wearables.

IC Role / Device Role / Timing Role: Low-loss, logic-level–driven load switch isolating downstream rails.

Use Value: Gate threshold of 1.3–2.5 V ensures reliable turn-on with 3.3 V MCU outputs; fast 8.1 ns t_D(on) supports precise timing control.

DC-DC Synchronous Rectifier

Motor Driver Half-Bridge Leg

Use Scenario: Secondary-side rectification in isolated 5–12 V flyback converters.

IC Role / Device Role / Timing Role: Low-V_F body diode and fast t_rr enable efficient synchronous rectification.

Use Value: Body diode V_SD = 0.7–1.0 V and t_rr = 14–17 ns reduce reverse-recovery loss versus Schottky alternatives.

Use Scenario: Low-side switch in brushed DC motor drivers for robotics and power tools.

IC Role / Device Role / Timing Role: High-current, avalanche-rated switch handling commutation transients.

Use Value: 88 mJ E_AR and 59 A I_DM support repeated inductive kickback without derating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si2302DS-T1-GE3	R_DS(ON) = 30 mΩ @ 4.5 V; SOT-23 package; 2.9 A I_D	Lower current, smaller footprint; suited for <3 A signal-switching, not power switching	Select only for ultra-low-cost, low-power logic-level switching where R_DS(ON) > 25 mΩ is acceptable.
IRF7470PBF	R_DS(ON) = 6.5 mΩ @ 10 V; SO-8; 14.5 A I_D; no 100% UIS test	Similar package and voltage rating but lower current rating and unverified UIS robustness	Consider when legacy IR design reuse is required, but verify avalanche margin in final layout.

Compared with Si2302DS-T1-GE3 and IRF7470PBF, the AO4498 delivers superior current density (18 A), lower on-resistance at both 4.5 V and 10 V, and factory-validated UIS performance-making it the preferred choice for production-grade battery and load-switch applications demanding reliability and efficiency.

Availability

AO4498 is available at Aetrix Electronics and suitable for battery protection circuits, portable device load switching, DC-DC synchronous rectification, and motor driver half-bridge legs requiring stable component supply and long-term industrial availability.

Supply support for AO4498 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, industrial, and automotive markets.

The AO4498 belongs to AOS's TrenchMOS™ low-R_DS(ON) N-channel portfolio, engineered specifically for high-efficiency, high-current switching in space-constrained portable and battery-powered systems.

FAQ

What is the maximum gate-source voltage rating for the AO4498?

The AO4498 has a maximum gate-source voltage (V_GS) rating of ±20 V. Exceeding this limit risks permanent gate oxide damage. In practice, drive circuits should clamp V_GS to ≤12 V for safety margin, especially during transient events. The AO4498 datasheet specifies V_GS = 10 V for R_DS(ON) characterization and confirms operation down to V_GS(th) = 1.3 V minimum.

Does the AO4498 support logic-level gate drive from a 3.3 V microcontroller?

Yes, the AO4498 supports logic-level drive: its gate threshold voltage (V_GS(th)) ranges from 1.3 V to 2.5 V, and R_DS(ON) is specified at 7.5 mΩ with V_GS = 4.5 V and ID = 16 A. At 3.3 V, the device conducts sufficiently for many load-switch applications, though R_DS(ON) increases-confirm actual on-resistance using Figure 5 in the AO4498 datasheet.

What is the thermal resistance from junction to ambient for the AO4498?

The AO4498 has a junction-to-ambient thermal resistance (R_θJA) of 40 °C/W, measured on a 1 in² FR-4 board with 2 oz copper in still air. This value assumes standard SOIC-8 mounting; actual R_θJA improves significantly with added copper pour or thermal vias under the exposed drain pad. The AO4498's R_θJL is 16–24 °C/W, confirming strong lead-to-board conduction.

Is the AO4498 suitable for synchronous rectification in DC-DC converters?

Yes, the AO4498 is well-suited for synchronous rectification due to its low R_DS(ON), fast body diode (t_rr = 14–17 ns, Q_rr = 40 nC), and low V_SD (0.7–1.0 V). These characteristics reduce conduction and recovery losses compared to discrete Schottky diodes. When used in a 5–12 V output converter, the AO4498 improves efficiency by 1–3% over conventional rectification-provided gate timing avoids shoot-through.

What does "100% UIS tested" mean for the AO4498?

"100% UIS tested" means every AO4498 unit undergoes unclamped inductive switching stress screening at rated current and voltage, verifying ability to absorb inductive energy without failure. This ensures field reliability in applications like motor drives and relay drivers where inductive kickback occurs. Unlike statistical sampling, 100% UIS testing provides lot-level confidence that each AO4498 meets AOS's published E_AR = 88 mJ specification.

AO4498 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:: 18A (Tc)

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

Rds On (Max) @ Id, Vgs:: 5.5mOhm @ 18A, 10V

Vgs(th) (Max) @ Id:: 2.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 44.5 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 2300 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

AO4498 FAQ

1.How can I place an order for AO4498 through Aetrix?

Please submit a Request for Quotation (RFQ) for AO4498 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 AO4498 reliable?

The price and inventory of AO4498 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AO4498 is usually 5 days.

3.What payment methods are accepted for AO4498?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AO4498 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AO4498?

AO4498 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AO4498 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 AO4498?

For technical support, including AO4498 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AO4498 requirements.

6.How does Aetrix verify that AO4498 is sourced from the original manufacturer or authorized distributors?

All AO4498 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 AO4498 meets industry standards.

7.What is the process for return or replacement of AO4498?

All AO4498 units undergo pre-shipment inspection (PSI). If there is an issue with AO4498, 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 AO4498 part is unused and in its original packaging.

Return procedure for AO4498:

1.Submit a request within 90 days.

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

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