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

Alpha & Omega Semiconductor Inc. AO4423

Name: AO4423
Brand: Alpha & Omega Semiconductor Inc.
SKU: AO4423
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AO4423

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

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

Datasheet:: AO4423.pdf

Description:: MOSFET P-CH 30V 17A 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AO4423 from Alpha & Omega Semiconductor is a 30V P-Channel MOSFET in SOIC-8 package, featuring R_DS(ON) < 6.2 mΩ at V_GS = −20 V, −17 A continuous drain current, and 100% UIS tested robustness. It serves as a high-efficiency load switch or PWM-controlled power stage in DC-DC converters and battery protection circuits.

For engineers reviewing the AO4423 datasheet, pinout, applications, or equivalent options, key selection criteria include its trench-based low-R_DS(ON) performance, gate charge (Q_g = 47–57 nC), thermal resistance (R_θJA = 75 °C/W), and −30 V V_DS rating for negative-rail switching.

Technical Context

This device implements advanced trench-gate MOSFET architecture optimized for low conduction loss and fast switching. Its −2.1 V typical gate threshold voltage (V_GS(th)) enables reliable turn-on with standard logic-level drive, while the 25 V gate rating supports robust overvoltage margin.

Thermal design relies on SOIC-8's junction-to-lead (R_θJL = 14 °C/W) and junction-to-ambient (R_θJA = 75 °C/W) paths under defined PCB conditions. The 100% R_g test ensures gate resistance consistency (2.1–6.4 Ω), critical for predictable switching timing and EMI control.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	−30 V - Maximum blocking voltage for negative-rail applications like high-side load switches.
R_DS(ON) @ V_GS = −20 V	< 6.2 mΩ - Enables ≤1.8 W conduction loss at −17 A, reducing heatsink requirements.
I_D Continuous	−17 A @ T_A = 25°C - Supports high-current battery disconnect or motor control stages.
Q_g	47–57 nC - Determines gate driver power and switching speed; compatible with standard logic-level drivers.
V_GS(th)	−1.5 to −2.6 V - Ensures turn-on with 3.3 V or 5 V microcontroller outputs without level-shifting.
R_θJA	75 °C/W - Specifies thermal derating on 1 in² 2 oz copper FR-4; limits usable power at elevated ambient temperatures.
UIS Tested	100% unclamped inductive switching - Validates ruggedness against inductive kickback in relay/motor drive circuits.

Pinout & Package

SOIC-8 surface-mount package with exposed drain pad (pins 1–4 and 6–8 are source/drain terminals; pin 5 is gate). Thermal performance depends on PCB copper area connected to drain leads.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 6, 7, 8	Drain / Source parallel connection	Multiple pins tied internally to drain (1–4, 6–8) and source (5 is gate; 1–4/6–8 shared drain; pin 5 isolated gate) - requires correct PCB layout per datasheet top/bottom view.
5	Gate	Control terminal; 2.1–6.4 Ω internal gate resistance verified 100%, enabling predictable rise/fall times.

Key Features

Feature	Design Value
Advanced trench technology	Delivers <6.2 mΩ R_DS(ON) at −20 V while maintaining low gate charge for efficient high-frequency PWM.
ESD protection	Integrated protection meets human-body model (HBM) requirements, reducing external TVS dependency in board-level ESD design.
100% R_g tested	Guarantees gate resistance between 2.1–6.4 Ω, ensuring consistent switching behavior across production lots.
100% UIS tested	Validates ability to withstand repetitive unclamped inductive energy events up to rated BVDSS without failure.

Applications

Battery Protection Circuit	DC-DC Synchronous Rectifier
Use Scenario: Reverse-polarity and overcurrent protection in portable Li-ion battery packs. IC Role / Device Role / Timing Role: P-Channel high-side switch controlling battery discharge path with fast turn-off during fault detection. Use Value: Low R_DS(ON) minimizes voltage drop and self-heating during sustained 10–15 A loads, extending battery runtime.	Use Scenario: Secondary-side rectification in non-isolated buck converters for point-of-load regulation. IC Role / Device Role / Timing Role: Synchronously replaces Schottky diode to reduce conduction loss during low-V_OUT operation. Use Value: 6.2 mΩ on-resistance cuts forward voltage drop by >70% vs. 0.4 V Schottky, improving efficiency at 12 A output.
Hot-Swap Controller	Motor Drive H-Bridge High-Side
Use Scenario: Inrush current limiting and fault isolation in enterprise server backplanes. IC Role / Device Role / Timing Role: Controlled turn-on via gate resistor network to ramp bus voltage smoothly during insertion. Use Value: Precise V_GS(th) distribution (−1.5 to −2.6 V) ensures predictable turn-on threshold across temperature and lot variance.	Use Scenario: Upper-leg switch in 24 V brushed DC motor H-bridge for industrial actuators. IC Role / Device Role / Timing Role: High-side P-channel switch driven by charge-pump gate driver to enable bidirectional control. Use Value: 25 V gate rating provides margin against gate-drive overshoot in noisy motor environments, enhancing reliability.

Battery Protection Circuit

DC-DC Synchronous Rectifier

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

IC Role / Device Role / Timing Role: P-Channel high-side switch controlling battery discharge path with fast turn-off during fault detection.

Use Value: Low R_DS(ON) minimizes voltage drop and self-heating during sustained 10–15 A loads, extending battery runtime.

Use Scenario: Secondary-side rectification in non-isolated buck converters for point-of-load regulation.

IC Role / Device Role / Timing Role: Synchronously replaces Schottky diode to reduce conduction loss during low-V_OUT operation.

Use Value: 6.2 mΩ on-resistance cuts forward voltage drop by >70% vs. 0.4 V Schottky, improving efficiency at 12 A output.

Hot-Swap Controller

Motor Drive H-Bridge High-Side

Use Scenario: Inrush current limiting and fault isolation in enterprise server backplanes.

IC Role / Device Role / Timing Role: Controlled turn-on via gate resistor network to ramp bus voltage smoothly during insertion.

Use Value: Precise V_GS(th) distribution (−1.5 to −2.6 V) ensures predictable turn-on threshold across temperature and lot variance.

Use Scenario: Upper-leg switch in 24 V brushed DC motor H-bridge for industrial actuators.

IC Role / Device Role / Timing Role: High-side P-channel switch driven by charge-pump gate driver to enable bidirectional control.

Use Value: 25 V gate rating provides margin against gate-drive overshoot in noisy motor environments, enhancing reliability.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si7157DP	R_DS(ON) = 7.5 mΩ @ −10 V; Q_g = 42 nC; SO-8 package	Slightly higher on-resistance but lower gate charge reduces driver losses in high-frequency operation.	Prefer when gate drive power budget is tighter than conduction loss budget.
IRF7425PbF	R_DS(ON) = 9.0 mΩ @ −10 V; Q_g = 32 nC; SO-8 package	Lower gate charge improves switching speed but higher R_DS(ON) increases conduction loss above 8 A.	Choose for <10 A applications where fast switching dominates thermal design.

Compared with Si7157DP and IRF7425PbF, the AO4423 offers the lowest R_DS(ON) at −20 V (≤6.2 mΩ), making it optimal for high-current, moderate-frequency (<500 kHz) load switching where conduction loss dominates system efficiency.

Availability

AO4423 is available at Aetrix Electronics and suitable for battery protection circuits, DC-DC synchronous rectifiers, hot-swap controllers, and motor drive H-bridges requiring stable component supply and long-term industrial availability.

Supply support for AO4423 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, consumer, and industrial markets.

The AO4423 belongs to AOS's trench-based P-Channel MOSFET product line, engineered for high-current, low-voltage switching in space-constrained power management systems.

FAQ

What is the maximum continuous drain current rating for the AO4423?

The AO4423 supports −17 A continuous drain current at T_A = 25°C with proper PCB thermal design. At T_A = 70°C, the rating drops to −14 A due to thermal derating governed by R_θJA = 75 °C/W. This value assumes SOIC-8 mounting on 1 in² 2 oz copper FR-4 in still air - actual current must be validated against measured junction temperature in the target layout.

Does the AO4423 require a gate driver IC for microcontroller interfacing?

The AO4423 does not require an external gate driver when driven by 3.3 V or 5 V microcontrollers, as its V_GS(th) range (−1.5 to −2.6 V) ensures full enhancement at logic-level voltages. However, for high-frequency PWM (>200 kHz) or high-current switching, a dedicated driver improves rise/fall time control and reduces gate loop inductance - the AO4423's 100% R_g test ensures predictable gate timing.

How is the AO4423 protected against unclamped inductive switching events?

The AO4423 undergoes 100% unclamped inductive switching (UIS) testing per JEDEC standards, verifying its ability to absorb inductive energy without failure. This capability stems from its trench structure and optimized silicon layout, allowing safe operation in relay driving, solenoid control, and motor commutation where flyback voltage spikes occur - no external snubber is required for typical 24 V inductive loads.

What is the significance of the 100% Rg test for the AO4423?

The 100% R_g test on every AO4423 unit verifies gate resistance between 2.1 Ω and 6.4 Ω, ensuring consistent gate charging behavior across production lots. This directly impacts switching speed predictability, EMI profile, and gate driver stress - eliminating variability that could otherwise cause timing skew or shoot-through risk in synchronous designs using the AO4423.

Can the AO4423 be used in place of an N-Channel MOSFET in high-side switching configurations?

Yes - the AO4423 is specifically designed as a P-Channel MOSFET for high-side switching without requiring a floating gate driver. Its −30 V V_DS rating and logic-compatible V_GS(th) allow direct interface with microcontroller GPIOs to control positive-rail loads. Unlike N-Channel alternatives, the AO4423 eliminates need for charge-pump or bootstrap circuitry, simplifying layout and reducing BOM count in low-to-moderate frequency applications.

AO4423 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:: P-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 30 V

Current - Continuous Drain (Id) @ 25°C:: 17A (Ta)

Drive Voltage (Max Rds On, Min Rds On):: 6V, 20V

Rds On (Max) @ Id, Vgs:: 6.2mOhm @ 15A, 20V

Vgs(th) (Max) @ Id:: 2.6V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 57 nC @ 10 V

Vgs (Max):: ±25V

Input Capacitance (Ciss) (Max) @ Vds:: 3033 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

AO4423 FAQ

1.How can I place an order for AO4423 through Aetrix?

Please submit a Request for Quotation (RFQ) for AO4423 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 AO4423 reliable?

The price and inventory of AO4423 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AO4423 is usually 5 days.

3.What payment methods are accepted for AO4423?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AO4423 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AO4423?

AO4423 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AO4423 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 AO4423?

For technical support, including AO4423 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AO4423 requirements.

6.How does Aetrix verify that AO4423 is sourced from the original manufacturer or authorized distributors?

All AO4423 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 AO4423 meets industry standards.

7.What is the process for return or replacement of AO4423?

All AO4423 units undergo pre-shipment inspection (PSI). If there is an issue with AO4423, 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 AO4423 part is unused and in its original packaging.

Return procedure for AO4423:

1.Submit a request within 90 days.

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

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