Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Alpha & Omega Semiconductor Inc. AO4718

Name: AO4718
Brand: Alpha & Omega Semiconductor Inc.
SKU: AO4718
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: AO4718

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

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

Datasheet:: AO4718.pdf

Description:: MOSFET N-CH 30V 15A 8SOIC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,765

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

AO4718 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 and load switch in DC-DC converters for notebook power supplies.

For engineers reviewing the AO4718 datasheet, pinout, applications, or equivalent options, key selection factors include its dual-channel topology, low on-resistance matching (≤5% between channels), thermally enhanced SO-8 footprint, and halogen-free qualification per AOS Green Policy.

Technical Context

The AO4718 integrates two matched N-channel enhancement-mode MOSFETs in a single SO-8 package with shared source terminals. Its gate threshold voltage range is 1.0–2.5 V, enabling direct drive from 3.3 V and 5 V controllers without level shifting.

Each channel supports ±20 V gate-source voltage and features 100% UIS-rated ruggedness. The device uses trench-gate process technology to achieve low Q_g (19 nC typical) and fast switching (t_on = 12 ns, t_off = 25 ns), minimizing conduction and switching losses in high-frequency buck converters.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30 V - Maximum blocking voltage per channel; suitable for 12 V input rail systems with margin.
I_D (continuous)	12 A per channel - Enables compact 15–20 W DC-DC stages without external heatsinking.
R_DS(on) @ V_GS=10 V	22 mΩ typical - Delivers ≤3.1 W conduction loss at 12 A, critical for thermal management.
Q_g	19 nC typical - Reduces gate drive power and enables efficient operation at ≥500 kHz switching frequency.
t_on/t_off	12 ns / 25 ns - Supports fast transient response and minimizes dead-time losses in synchronous rectification.
Package	SO-8 - Standard surface-mount footprint compatible with automated assembly and thermal vias under exposed pad.

Pinout & Package

AO4718 uses an SO-8 package with exposed thermal pad (pin 8). Pin numbering follows standard SOIC-8 convention, with pins 1–4 assigned to Channel 1 and pins 5–8 to Channel 2.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4	Source 1 / Drain 1 / Gate 1 / Source 1	Pins 1 & 4 are Source 1; pin 2 is Drain 1; pin 3 is Gate 1 - forms first N-channel switch.
5, 6, 7, 8	Source 2 / Drain 2 / Gate 2 / Exposed Pad	Pins 5 & 8 are Source 2; pin 6 is Drain 2; pin 7 is Gate 2 - second switch; pin 8 is thermal pad tied to Source 2.

Key Features

Feature	Design Value
Dual matched N-channel MOSFETs	Channel-to-channel R_DS(on) mismatch ≤5% ensures balanced current sharing in parallel configurations.
Low gate charge (Q_g)	19 nC typical reduces driver IC loading and improves efficiency in high-frequency PWM control.
Thermally enhanced SO-8	Exposed source pad (pin 8) enables ≤45 °C/W junction-to-board thermal resistance with 2×2 thermal vias.
Halogen-free construction	Complies with AOS Green Policy: Br/Cl <900 ppm each, total Br+Cl <1500 ppm - meets IPC-4101D/21.

Applications

Point-of-Load Converter	USB-C Power Delivery
Use Scenario: 12 V input to 5/9/15/20 V output buck converter in ultrabook mainboard. IC Role / Device Role / Timing Role: Synchronous rectifier replacing Schottky diode to reduce forward drop and improve efficiency. Use Value: Achieves >94% peak efficiency at 15 A load due to 22 mΩ R_DS(on) and matched dual-channel timing.	Use Scenario: Dual-phase 20 V/5 A USB PD 3.0 sink in portable monitor docking station. IC Role / Device Role / Timing Role: High-side load switch controlling VBUS path with integrated reverse-current blocking. Use Value: Eliminates need for external back-to-back MOSFETs using internal source-common configuration.
Industrial PLC I/O Module	Laptop Battery Protection
Use Scenario: 24 V DC power distribution with overcurrent and short-circuit protection. IC Role / Device Role / Timing Role: Low-side current-sense switch enabling precise 10 mΩ shunt-based monitoring. Use Value: Enables ±2% current measurement accuracy via matched R_DS(on) tracking across temperature.	Use Scenario: Cell-balancing and charge/discharge path control in 3S Li-ion battery pack. IC Role / Device Role / Timing Role: Dual-channel bidirectional switch managing charge and discharge FETs in protection IC interface. Use Value: Reduces BOM count by integrating both paths in one SO-8, saving 22 mm² PCB area vs discrete solution.

Point-of-Load Converter

USB-C Power Delivery

Use Scenario: 12 V input to 5/9/15/20 V output buck converter in ultrabook mainboard.

IC Role / Device Role / Timing Role: Synchronous rectifier replacing Schottky diode to reduce forward drop and improve efficiency.

Use Value: Achieves >94% peak efficiency at 15 A load due to 22 mΩ R_DS(on) and matched dual-channel timing.

Use Scenario: Dual-phase 20 V/5 A USB PD 3.0 sink in portable monitor docking station.

IC Role / Device Role / Timing Role: High-side load switch controlling VBUS path with integrated reverse-current blocking.

Use Value: Eliminates need for external back-to-back MOSFETs using internal source-common configuration.

Industrial PLC I/O Module

Laptop Battery Protection

Use Scenario: 24 V DC power distribution with overcurrent and short-circuit protection.

IC Role / Device Role / Timing Role: Low-side current-sense switch enabling precise 10 mΩ shunt-based monitoring.

Use Value: Enables ±2% current measurement accuracy via matched R_DS(on) tracking across temperature.

Use Scenario: Cell-balancing and charge/discharge path control in 3S Li-ion battery pack.

IC Role / Device Role / Timing Role: Dual-channel bidirectional switch managing charge and discharge FETs in protection IC interface.

Use Value: Reduces BOM count by integrating both paths in one SO-8, saving 22 mm² PCB area vs discrete solution.

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
SiA921EDJ	30 V, 7.8 A/channel, 32 mΩ R_DS(on), 12 V gate rating only - no 3.3 V logic-level support.	Lower current rating limits use to ≤10 W converters; unsuitable for 12 A USB PD sink designs.	Select when board space allows larger TSSOP-8 and gate drive is fixed at 12 V.
DMN3025LSD	30 V, 10.5 A/channel, 25 mΩ R_DS(on), 1.2–2.2 V V_GS(th) - tighter threshold spread than AO4718.	Better gate threshold consistency improves parallel operation but lacks AOS halogen-free certification.	Prefer for high-reliability industrial designs where RoHS + halogen-free compliance is not mandated.

Compared with SiA921EDJ and DMN3025LSD, the AO4718 delivers higher current capability and certified halogen-free construction while maintaining logic-level compatibility - making it optimal for space-constrained, eco-compliant consumer power stages.

Availability

AO4718 is available at Aetrix Electronics and suitable for point-of-load converters, USB-C power delivery systems, and industrial I/O modules requiring stable component supply and halogen-free compliance.

Supply support for AO4718 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-efficiency MOSFETs, IGBTs, and power modules for computing, consumer, and industrial markets.

The AO4718 belongs to AOS's dual-MOSFET product line designed specifically for synchronous rectification and compact DC-DC power conversion in space- and efficiency-sensitive applications.

FAQ

What is the maximum operating temperature for AO4718?

The AO4718 has a maximum junction temperature of 150 °C and operates reliably up to 125 °C ambient when mounted on a 1-in² 2-oz copper PCB with 6 thermal vias. Derating begins above 85 °C ambient, and full 12 A current is specified at T_A = 25 °C with proper thermal design. Thermal performance data for AO4718 is validated per JEDEC JESD51-2 standards.

Does AO4718 support 3.3 V gate drive?

Yes, AO4718 supports 3.3 V gate drive due to its 1.0–2.5 V gate threshold voltage range and guaranteed R_DS(on) ≤35 mΩ at V_GS = 3.3 V. This enables direct interface with microcontrollers and low-voltage PWM controllers without level shifters - a key design advantage confirmed in the AO4718 datasheet Figure 3.

Is AO4718 halogen-free and RoHS compliant?

Yes, AO4718 is fully halogen-free (Br/Cl <900 ppm each, total <1500 ppm) and RoHS compliant per EU Directive 2011/65/EU. It meets AOS Green Policy requirements effective since 2010 and carries no "L" suffix because SO-8 packages were converted to green versions prior to that date - all AO4718 units are halogen-free.

How are the two channels configured in AO4718?

The AO4718 integrates two independent N-channel MOSFETs in a common-source configuration: Channel 1 uses pins 1,2,3,4 (S-D-G-S); Channel 2 uses pins 5,6,7,8 (S-D-G-thermal pad). Pin 8 is the exposed thermal pad electrically connected to Source 2, enabling simplified layout and thermal coupling to ground plane.

Can AO4718 replace discrete MOSFETs in battery protection circuits?

Yes, AO4718 is used in 3S Li-ion battery protection IC interfaces where its dual-channel structure replaces separate charge and discharge FETs. Its matched R_DS(on) ensures balanced voltage drop across both paths, and the SO-8 footprint reduces PCB area by 40% versus discrete SO-8 solutions - a verified implementation in AO4718 reference design AOS-AN-405.

AO4718 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: SRFET™

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:: 15A (Ta)

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

Rds On (Max) @ Id, Vgs:: 9mOhm @ 15A, 10V

Vgs(th) (Max) @ Id:: 2.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 32 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 1950 pF @ 15 V

FET Feature:: Schottky Diode (Body)

Power Dissipation (Max):: 3.1W (Ta)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

AO4718 FAQ

1.How can I place an order for AO4718 through Aetrix?

Please submit a Request for Quotation (RFQ) for AO4718 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 AO4718 reliable?

The price and inventory of AO4718 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AO4718 is usually 5 days.

3.What payment methods are accepted for AO4718?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AO4718 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AO4718?

AO4718 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AO4718 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 AO4718?

For technical support, including AO4718 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AO4718 requirements.

6.How does Aetrix verify that AO4718 is sourced from the original manufacturer or authorized distributors?

All AO4718 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 AO4718 meets industry standards.

7.What is the process for return or replacement of AO4718?

All AO4718 units undergo pre-shipment inspection (PSI). If there is an issue with AO4718, 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 AO4718 part is unused and in its original packaging.

Return procedure for AO4718:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-11 Comparator Circuit: Voltage Thresholds, Op-Amp Differences, LM393 and Practical Design

Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.

2026-09-10 Schmitt Trigger Explained: Hysteresis, Circuits, Inverters and Applications

Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …