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

Alpha & Omega Semiconductor Inc. AOI423

Name: AOI423
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOI423
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOI423

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-251-3 Stub Leads, IPAK

Datasheet:: AOI423.pdf

Description:: MOSFET P-CH 30V 15A/70A TO251A

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AOI423 from Alpha & Omega Semiconductor is a -30V, -70A P-channel MOSFET in TO-251A (IPAK) package, featuring R_DS(ON) < 6.7 mΩ at V_GS = -20V and < 8.5 mΩ at V_GS = -10V, with 100% UIS and R_g tested, designed for high-current load switching in DC-DC converters and motor drivers.

For engineers reviewing the AOI423 datasheet, pinout, applications, or equivalent options, key selection criteria include its P-channel topology, thermal resistance (R_θJC = 1.6°C/W), avalanche-rated operation, gate charge (Q_g = 45–65 nC), and TO-251A package compatibility with high-power PCB layouts.

Technical Context

This device employs AlphaSGT™ trench technology to achieve low R_DS(ON), low gate charge (Q_g = 45–65 nC), and low gate resistance (R_g = 1.5–6.0 Ω), enabling fast switching with reduced conduction and switching losses. Its body diode exhibits t_rr = 15 ns and Q_rr = 30 nC under IF = -20 A, dI/dt = 500 A/μs conditions.

The AOI423 operates across -55°C to +175°C junction temperature range, supports pulsed drain current up to -200 A, and is characterized for unclamped inductive switching (UIS) with E_AS = 125 mJ - critical for robustness in relay replacement and H-bridge freewheeling applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	-30 V - maximum blocking voltage for low-voltage P-channel high-side switch applications
I_D (V_GS = -20 V)	-70 A - continuous drain current rating at full gate drive, suitable for >50 W load control
R_DS(ON) (V_GS = -20 V)	< 6.7 mΩ - enables <1 W conduction loss at 40 A, reducing heatsink requirements
R_DS(ON) (V_GS = -10 V)	< 8.5 mΩ - ensures usable on-resistance with standard logic-level gate drive
Q_g	45–65 nC - defines total gate charge needed for full turn-on, directly impacting driver sizing
R_θJC	1.6 °C/W - junction-to-case thermal resistance enables efficient heat transfer to heatsink or copper pour
E_AS	125 mJ - single-pulse avalanche energy rating confirms ruggedness in inductive load switching

Pinout & Package

AOI423 is housed in TO-251A (IPAK) package - surface-mount, single-gull-wing lead, thermally enhanced variant of IPAK with short leads optimized for high-current PCB mounting and thermal dissipation.

Pin/Terminal	Circuit Role	Design Meaning
G	Gate	Control terminal accepting -10 V to -20 V gate drive; R_g = 1.5–6.0 Ω affects switching speed and ringing
D	Drain	Main current-carrying terminal connected to input rail in high-side switch configuration
S	Source	Reference terminal tied to load return; body diode anode, enabling reverse-current freewheeling

Key Features

Feature	Design Value
AlphaSGT™ trench process	Delivers ultra-low R_DS(ON) and high cell density without compromising ruggedness or gate oxide reliability
100% UIS tested	Guarantees minimum 125 mJ avalanche energy per device, eliminating screening failures in inductive switching
100% R_g tested	Ensures consistent gate drive timing and reduces variation in turn-on/turn-off delays across production lots
TO-251A thermal performance	R_θJC = 1.6°C/W enables >90 W power dissipation with modest heatsinking, exceeding TO-252 limits
Low Q_gd/Q_g ratio	Q_gd = 12 nC / Q_g ≈ 20% minimizes Miller effect, improving hard-switching stability at high dV/dt

Applications

DC-DC Converter High-Side Switch	Motor Driver Half-Bridge
Use Scenario: Used as synchronous rectifier or high-side switch in non-isolated buck converters delivering 12–24 V output at up to 40 A. IC Role / Device Role / Timing Role: P-channel MOSFET providing controlled power path from input rail to inductor; body diode handles freewheeling during low-side conduction. Use Value: R_DS(ON) < 8.5 mΩ at -10 V gate drive enables >94% efficiency at 30 A, reducing thermal stress vs. N-channel alternatives requiring bootstrap circuitry.	Use Scenario: Integrated into dual half-bridge modules for 12 V brushed DC motor control in automotive HVAC actuators and industrial valves. IC Role / Device Role / Timing Role: Upper-leg switch in H-bridge topology; paired with complementary N-channel device for bidirectional drive and regenerative braking. Use Value: 100% UIS-tested ruggedness withstands inductive kickback during PWM commutation, eliminating external snubbers in 20 kHz switching designs.
Hot-Swap Controller	Load Switch for Industrial PLC I/O
Use Scenario: Enables controlled inrush current limiting and fault isolation in 24 V backplane hot-swap circuits for modular I/O systems. IC Role / Device Role / Timing Role: High-side load switch managed by dedicated hot-swap controller IC; AOI423 provides main current path and overcurrent protection interface. Use Value: Low R_DS(ON) minimizes voltage drop during steady-state operation (<150 mV @ 20 A), preserving downstream rail regulation while supporting fast fault shutdown via gate control.	Use Scenario: Powers field devices (sensors, solenoids, indicators) in programmable logic controller (PLC) digital output modules with individual channel protection. IC Role / Device Role / Timing Role: Individually controllable P-channel load switch per output channel, driven by microcontroller GPIO or level-shifter. Use Value: TO-251A package allows dense layout with thermal vias; -55°C to +175°C rating supports operation in uncooled control cabinets exposed to ambient extremes.

DC-DC Converter High-Side Switch

Motor Driver Half-Bridge

Use Scenario: Used as synchronous rectifier or high-side switch in non-isolated buck converters delivering 12–24 V output at up to 40 A.

IC Role / Device Role / Timing Role: P-channel MOSFET providing controlled power path from input rail to inductor; body diode handles freewheeling during low-side conduction.

Use Value: R_DS(ON) < 8.5 mΩ at -10 V gate drive enables >94% efficiency at 30 A, reducing thermal stress vs. N-channel alternatives requiring bootstrap circuitry.

Use Scenario: Integrated into dual half-bridge modules for 12 V brushed DC motor control in automotive HVAC actuators and industrial valves.

IC Role / Device Role / Timing Role: Upper-leg switch in H-bridge topology; paired with complementary N-channel device for bidirectional drive and regenerative braking.

Use Value: 100% UIS-tested ruggedness withstands inductive kickback during PWM commutation, eliminating external snubbers in 20 kHz switching designs.

Hot-Swap Controller

Load Switch for Industrial PLC I/O

Use Scenario: Enables controlled inrush current limiting and fault isolation in 24 V backplane hot-swap circuits for modular I/O systems.

IC Role / Device Role / Timing Role: High-side load switch managed by dedicated hot-swap controller IC; AOI423 provides main current path and overcurrent protection interface.

Use Value: Low R_DS(ON) minimizes voltage drop during steady-state operation (<150 mV @ 20 A), preserving downstream rail regulation while supporting fast fault shutdown via gate control.

Use Scenario: Powers field devices (sensors, solenoids, indicators) in programmable logic controller (PLC) digital output modules with individual channel protection.

IC Role / Device Role / Timing Role: Individually controllable P-channel load switch per output channel, driven by microcontroller GPIO or level-shifter.

Use Value: TO-251A package allows dense layout with thermal vias; -55°C to +175°C rating supports operation in uncooled control cabinets exposed to ambient extremes.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRF4905PbF	R_DS(ON) = 20 mΩ @ V_GS = -10 V; higher Q_g = 130 nC; TO-220 package	Larger footprint, lower current density, less suitable for compact high-frequency DC-DC designs	Prefer AOI423 where board space, thermal performance, or switching speed are critical
Si2301DS-T1-E3	R_DS(ON) = 115 mΩ @ V_GS = -4.5 V; SOT-23 package; I_D = -3 A max	Only suitable for sub-5 W loads; lacks UIS rating and thermal capacity for industrial use	Select AOI423 for >10 A, >20 W, or ruggedized applications requiring avalanche capability

Compared with IRF4905PbF and Si2301DS-T1-E3, the AOI423 delivers superior current density (-70 A), lower on-resistance (<8.5 mΩ), and proven UIS ruggedness - making it the preferred choice for space-constrained, high-reliability 24 V industrial power stages.

Availability

AOI423 is available at Aetrix Electronics and suitable for DC-DC converter design, motor driver development, and industrial load switching applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AOI423 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, industrial, and automotive markets.

The AOI423 belongs to AOS' AlphaSGT™ P-channel MOSFET product line, engineered for high-current, low-voltage switching in space-constrained industrial and automotive power systems where thermal performance and avalanche ruggedness are essential.

FAQ

What is the maximum continuous drain current for AOI423 at 100°C case temperature?

The AOI423 supports -67 A continuous drain current at T_C = 100°C, as specified in its Absolute Maximum Ratings table. This derating reflects thermal limits of the TO-251A package and ensures reliable operation when mounted on PCBs with adequate copper area or heatsinking. The AOI423 maintains this rating due to its low R_θJC of 1.6°C/W and robust silicon process.

Does AOI423 have a specified gate threshold voltage range?

Yes, the AOI423 has a gate threshold voltage (V_GS(th)) range of -1.5 V to -3.5 V at I_D = -250 μA, with typical value -2.5 V. This ensures reliable turn-on with standard -10 V or -12 V gate drive while maintaining noise immunity. The AOI423's defined V_GS(th) window supports predictable logic-level interfacing in industrial control circuits.

Is AOI423 rated for avalanche energy, and what is the test condition?

Yes, the AOI423 is 100% tested for unclamped inductive switching (UIS) with E_AS = 125 mJ at T_J = 25°C, L = 0.1 mH, and I_AR = -12 A. This rating is confirmed per JEDEC JESD24-11 and guarantees ruggedness in inductive load switching. The AOI423's UIS validation makes it suitable for H-bridge freewheeling and relay replacement without external clamping.

What is the body diode forward voltage of AOI423 at -1 A?

The AOI423 body diode forward voltage (V_SD) is -0.7 V to -1.0 V at I_S = -1 A and T_J = 25°C. This low V_SD reduces conduction loss during freewheeling phases in synchronous rectifiers and half-bridge topologies. The AOI423's diode characteristics are fully characterized in Figure 6 of its datasheet, supporting accurate loss modeling.

Can AOI423 be used with gate drive voltages down to -4.5 V?

Yes, the AOI423 is functional at V_GS = -4.5 V, though R_DS(ON) increases significantly above 20 mΩ. Its guaranteed R_DS(ON) spec applies at -10 V and -20 V, but the device remains conductive at lower voltages due to its -1.5 V minimum V_GS(th). For reliable low-loss operation, AOI423 should be driven with ≥ -10 V; designs using -4.5 V must verify thermal margin at target load current.

AOI423 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

Package/Case:: TO-251-3 Stub Leads, IPAK

Packaging:: Tube

Product Status:: Not For New Designs

FET Type:: P-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 30 V

Current - Continuous Drain (Id) @ 25°C:: 15A (Ta), 70A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 10V, 20V

Rds On (Max) @ Id, Vgs:: 6.7mOhm @ 20A, 20V

Vgs(th) (Max) @ Id:: 3.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 65 nC @ 10 V

Vgs (Max):: ±25V

Input Capacitance (Ciss) (Max) @ Vds:: 2760 pF @ 15 V

FET Feature:: -

Power Dissipation (Max):: 2.5W (Ta), 90W (Tc)

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-251A

AOI423 FAQ

1.How can I place an order for AOI423 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOI423 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 AOI423 reliable?

The price and inventory of AOI423 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOI423 is usually 5 days.

3.What payment methods are accepted for AOI423?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOI423 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOI423?

AOI423 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOI423 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 AOI423?

For technical support, including AOI423 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOI423 requirements.

6.How does Aetrix verify that AOI423 is sourced from the original manufacturer or authorized distributors?

All AOI423 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 AOI423 meets industry standards.

7.What is the process for return or replacement of AOI423?

All AOI423 units undergo pre-shipment inspection (PSI). If there is an issue with AOI423, 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 AOI423 part is unused and in its original packaging.

Return procedure for AOI423:

1.Submit a request within 90 days.

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

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