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. AOC2403

Name: AOC2403
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOC2403
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: AOC2403

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: 4-SMD, No Lead

Datasheet:: AOC2403.pdf

Description:: MOSFET P-CH 20V 1.8A 4ALPHADFN

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,909

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

Product details

Overview

AOC2403 from Alpha & Omega Semiconductor is a 20V P-Channel MOSFET in AlphaDFN 0.97×0.97mm 4-pin package, delivering R_DS(ON) < 95mΩ at V_GS = −4.5V and supporting gate drive down to 1.5V while maintaining ±8V V_GS(max). It serves as a low-voltage load switch in portable power management circuits.

For engineers reviewing the AOC2403 datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.5V logic-compatible gate threshold, 1.8A continuous drain current capability, trench-based low-R_DS(ON) performance, and compact 0.97×0.97mm DFN footprint for space-constrained DC-DC and battery protection designs.

Technical Context

This P-Channel MOSFET employs advanced trench gate technology to achieve enhanced channel density and reduced specific on-resistance. Its V_GS(th) range of −0.3V to −1.0V enables reliable turn-on with low-voltage controllers, and its 8V |V_GS(max)| rating ensures robustness against gate transients in 3.3V/5V systems.

The device features low dynamic parameters: Q_g = 4.8nC, Q_gd = 1.0nC, and C_iss = 405pF at V_DS = −10V, supporting efficient high-frequency switching in synchronous buck converters and reverse-polarity protection circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	−20V - supports input rails up to 20V in high-side or reverse-battery protection configurations
I_D (V_GS = −4.5V)	−1.8A - delivers sufficient current for USB-powered peripherals and small-signal load switching
R_DS(ON) (V_GS = −4.5V)	< 95mΩ - minimizes conduction loss and self-heating in 1A-class power paths
V_GS(th)	−0.3V to −1.0V - ensures full enhancement with 1.8V/2.5V/3.3V GPIOs without level-shifting
Q_g	4.8nC - enables fast switching with low gate-drive power in battery-operated systems
Package	AlphaDFN 0.97×0.97mm, 4-pin - ultra-compact footprint compatible with fine-pitch PCB assembly

Pinout & Package

Package: AlphaDFN 0.97×0.97mm, 4-pin, bottom-exposed thermal pad (no leads), RoHS-compliant, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1 (G)	Gate	Control terminal; accepts logic-level gate drive down to 1.5V; requires no external level shifter
2 (D)	Drain	High-side connection point; tied to input voltage rail in load-switch applications
3 (S)	Source	Output node; connected to load; referenced to system ground in high-side configuration
4 (S)	Source (redundant)	Second source terminal for improved current sharing and thermal conduction to PCB copper

Key Features

Feature	Design Value
1.5V gate drive compatibility	Operates fully enhanced with V_GS ≥ −1.5V, enabling direct interface with 1.8V microcontrollers
Trench MOSFET architecture	Delivers 95mΩ R_DS(ON) at −4.5V in sub-1mm² footprint-20% lower resistance than planar equivalents
Low gate charge (Q_g = 4.8nC)	Reduces switching losses and gate driver power consumption in 1–2MHz DC-DC controllers
Integrated body diode	Exhibits V_FSD = −0.73V and Q_rr = 8.5nC-suitable for freewheeling in synchronous rectification
±8V V_GS(max)	Provides margin against ESD and transient overvoltage during hot-plug or load-dump events

Applications

USB Power Switching	Reverse-Polarity Protection
Use Scenario: Controlling power delivery to USB peripherals in portable audio devices and handheld test equipment. IC Role / Device Role / Timing Role: High-side load switch managing 5V rail enable/disable with minimal voltage drop and fast response. Use Value: 95mΩ R_DS(ON) limits voltage drop to <180mV at 1.8A, preserving bus compliance and reducing thermal stress.	Use Scenario: Preventing damage from accidental reverse battery insertion in medical sensors and IoT edge nodes. IC Role / Device Role / Timing Role: P-Channel MOSFET placed between battery terminal and system ground to block reverse current flow. Use Value: Low V_GS(th) ensures immediate turn-off when polarity reverses; 20V rating covers Li-ion and multi-cell alkaline stacks.
Low-Voltage Logic-Level Switching	Power Path Management in Wearables
Use Scenario: Enabling/disabling subsystems (e.g., display backlight, BLE radio) using 1.8V or 2.5V GPIOs in wearables. IC Role / Device Role / Timing Role: Single-stage logic-level switch replacing discrete transistor + resistor networks. Use Value: Gate threshold centered at −0.65V allows clean turn-on/turn-off with 1.8V I/O, eliminating need for external biasing.	Use Scenario: Managing dual-input power sources (battery + USB) in smartwatches and hearables. IC Role / Device Role / Timing Role: Back-to-back P-MOSFET configuration for ideal diode behavior and seamless source handover. Use Value: Low Q_g and fast t_D(on)/t_D(off) support rapid path switching without output droop or glitch.

USB Power Switching

Reverse-Polarity Protection

Use Scenario: Controlling power delivery to USB peripherals in portable audio devices and handheld test equipment.

IC Role / Device Role / Timing Role: High-side load switch managing 5V rail enable/disable with minimal voltage drop and fast response.

Use Value: 95mΩ R_DS(ON) limits voltage drop to <180mV at 1.8A, preserving bus compliance and reducing thermal stress.

Use Scenario: Preventing damage from accidental reverse battery insertion in medical sensors and IoT edge nodes.

IC Role / Device Role / Timing Role: P-Channel MOSFET placed between battery terminal and system ground to block reverse current flow.

Use Value: Low V_GS(th) ensures immediate turn-off when polarity reverses; 20V rating covers Li-ion and multi-cell alkaline stacks.

Low-Voltage Logic-Level Switching

Power Path Management in Wearables

Use Scenario: Enabling/disabling subsystems (e.g., display backlight, BLE radio) using 1.8V or 2.5V GPIOs in wearables.

IC Role / Device Role / Timing Role: Single-stage logic-level switch replacing discrete transistor + resistor networks.

Use Value: Gate threshold centered at −0.65V allows clean turn-on/turn-off with 1.8V I/O, eliminating need for external biasing.

Use Scenario: Managing dual-input power sources (battery + USB) in smartwatches and hearables.

IC Role / Device Role / Timing Role: Back-to-back P-MOSFET configuration for ideal diode behavior and seamless source handover.

Use Value: Low Q_g and fast t_D(on)/t_D(off) support rapid path switching without output droop or glitch.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AO3401	R_DS(ON) = 44mΩ @ −4.5V (lower), but larger SOT-23 package (2.9×1.3mm) and higher Q_g = 8.5nC	Better conduction efficiency but less suitable for ultra-dense layouts	Select AO3401 when lower R_DS(ON) outweighs board area constraints and gate drive power budget permits higher Q_g
DMG1012T	R_DS(ON) = 120mΩ @ −4.5V (higher), same 0.97×0.97mm DFN package, V_GS(th) = −0.5V to −1.2V	Narrower V_GS(th) distribution improves consistency in mass production	Select DMG1012T when tighter gate threshold control is prioritized over on-resistance in cost-sensitive consumer designs

Compared with AO3401 and DMG1012T, the AOC2403 uniquely balances ultra-small footprint, 1.5V gate compatibility, and sub-100mΩ R_DS(ON), making it optimal for space- and voltage-constrained portable power switches where layout density and low-voltage controller integration are critical.

Availability

AOC2403 is available at Aetrix Electronics and suitable for USB power switching, reverse-polarity protection, and low-voltage logic-level switching requiring stable component supply and consistent parametric performance across production lots.

Supply support for AOC2403 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 ICs for computing, consumer, and industrial markets.

The AOC2403 belongs to AOS's AlphaDFN logic-level P-Channel MOSFET product line, engineered specifically for ultra-compact, low-voltage load switching in battery-powered and portable electronics.

FAQ

What is the maximum continuous drain current rating for the AOC2403?

The AOC2403 is rated for −1.8A continuous drain current at T_A = 25°C with minimum pad PCB mounting. At elevated ambient temperatures or under pulsed conditions (PW < 300µs, duty cycle ≤ 0.5%), peak current can reach −5A. Derating is required above 25°C per the normalized R_DS(ON) vs. temperature curve on page 3 of the AOC2403 datasheet.

Does the AOC2403 support 1.8V logic-level gate drive?

Yes, the AOC2403 supports 1.8V logic-level gate drive: its V_GS(th) range is −0.3V to −1.0V, and R_DS(ON) remains < 150mΩ at V_GS = −1.8V with I_D = −0.5A. This ensures full enhancement and low on-resistance when driven directly by 1.8V microcontroller GPIOs without external level shifting.

What is the thermal resistance (R_θJA) of the AOC2403 in standard PCB layout?

The AOC2403 has a junction-to-ambient thermal resistance (R_θJA) of 155°C/W when mounted on a minimum pad PCB per Note 1 in the Absolute Maximum Ratings table. This value assumes no additional copper pour; adding thermal vias and copper area reduces effective R_θJA significantly, as shown in the transient thermal impedance curves on page 4 of the AOC2403 datasheet.

Can the AOC2403 be used in back-to-back configuration for ideal diode operation?

Yes, the AOC2403 is suitable for back-to-back P-Channel MOSFET configurations in ideal diode and OR-ing applications. Its low Q_g (4.8nC), fast switching times (t_D(on) = 7.5ns), and integrated body diode with Q_rr = 8.5nC support efficient bidirectional blocking and controlled turn-on/turn-off sequencing in dual-power-path systems.

Is the AOC2403 qualified for automotive applications?

No, the AOC2403 is explicitly designed and qualified for the consumer market only. The datasheet states: "THIS PRODUCT HAS BEEN DESIGNED AND QUALIFIED FOR THE CONSUMER MARKET. APPLICATIONS OR USES AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS ARE NOT AUTHORIZED." It is not AEC-Q101 qualified and lacks automotive-grade reliability testing or extended temperature screening.

AOC2403 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

Package/Case:: 4-SMD, No Lead

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: P-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 20 V

Current - Continuous Drain (Id) @ 25°C:: 1.8A (Ta)

Drive Voltage (Max Rds On, Min Rds On):: 1.5V, 4.5V

Rds On (Max) @ Id, Vgs:: 95mOhm @ 1A, 4.5V

Vgs(th) (Max) @ Id:: 1V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 4.8 nC @ 4.5 V

Vgs (Max):: ±8V

Input Capacitance (Ciss) (Max) @ Vds:: 405 pF @ 10 V

FET Feature:: -

Power Dissipation (Max):: 450mW (Ta)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 4-AlphaDFN (0.97x0.97)

AOC2403 FAQ

1.How can I place an order for AOC2403 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOC2403 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 AOC2403 reliable?

The price and inventory of AOC2403 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOC2403 is usually 5 days.

3.What payment methods are accepted for AOC2403?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOC2403 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOC2403?

AOC2403 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOC2403 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 AOC2403?

For technical support, including AOC2403 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOC2403 requirements.

6.How does Aetrix verify that AOC2403 is sourced from the original manufacturer or authorized distributors?

All AOC2403 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 AOC2403 meets industry standards.

7.What is the process for return or replacement of AOC2403?

All AOC2403 units undergo pre-shipment inspection (PSI). If there is an issue with AOC2403, 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 AOC2403 part is unused and in its original packaging.

Return procedure for AOC2403:

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 …