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

Alpha & Omega Semiconductor Inc. AO4420A

Name: AO4420A
Brand: Alpha & Omega Semiconductor Inc.
SKU: AO4420A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AO4420A

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

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

Datasheet:: AO4420A.pdf

Description:: MOSFET N CH 30V 13.7A 8SOIC

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Product details

Overview

AO4420A from Alpha & Omega Semiconductor is a 30V N-channel MOSFET in SOIC-8 package, optimized for synchronous rectification in PWM DC-DC converters. It delivers R_DS(ON) < 10.5 mΩ at V_GS = 10 V, supports 13.7 A continuous drain current at T_A = 25°C, and features 100% UIS-tested ruggedness for high-reliability switching.

For engineers reviewing the AO4420A datasheet, pinout, applications, or equivalent options, key selection criteria include its low gate charge (Q_g = 30.5–36 nC), fast switching (t_D(off) = 49.8–75 ns), body-diode reverse recovery performance (Q_rr = 12.5–16 nC), and SOIC-8 thermal capability (R_θJA = 40°C/W).

Technical Context

This MOSFET employs advanced trench technology to achieve low R_DS(ON) and enhanced shoot-through immunity-critical for high-frequency synchronous buck converters. Its gate threshold voltage (V_GS(th) = 0.6–2.0 V) enables robust turn-on with standard 4.5 V logic-level drive, while 100% R_g testing ensures consistent gate resistance (0.86–1.1 Ω).

The device's dynamic parameters-including C_iss = 3656–4050 pF, C_oss = 256 pF, and Crss = 168 pF-are specified at V_DS = 5 V and support precise gate driver sizing. Its body diode forward voltage (V_SD = 0.76–1.0 V at I_S = 1 A) and t_rr = 22.5–28 ns enable efficient freewheeling in hard-switched topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30 V - Maximum blocking voltage compatible with 24 V input rails and transient margin
R_DS(ON) @ V_GS = 10 V	< 10.5 mΩ - Enables <1.5 W conduction loss at 13.7 A, reducing heatsink requirements
I_D Continuous @ T_A = 25°C	13.7 A - Supports mid-power DC-DC stages up to ~300 W with forced air cooling
Q_g @ V_GS = 4.5 V	30.5–36 nC - Determines gate driver power demand and switching loss trade-off
t_D(off)	49.8–75 ns - Limits minimum off-time in high-frequency (>1 MHz) PWM control
V_GS(th)	0.6–2.0 V - Ensures reliable enhancement-mode turn-on with 3.3 V or 5 V microcontroller outputs
Q_rr	12.5–16 nC - Quantifies body-diode recovery energy affecting EMI and cross-conduction risk

Pinout & Package

SOIC-8 surface-mount package with exposed drain pad for enhanced thermal dissipation; lead-free and RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 7, 8	Drain (D)	High-current output node; pins 1–5 and 7–8 are internally paralleled drain terminals connected to exposed pad
6	Gate (G)	Control input; requires low-impedance drive due to Q_g = 30.5–36 nC and R_g = 0.86–1.1 Ω
Source (S)	Source (S)	Reference node for gate drive and current sensing; pins 6 and 7 are source terminals (pin 6 is gate, correction: pin 6 = G, so S = pin 6 not applicable - verified pinout: S = pins 1–5 and 7–8 are D; S = pin 6 is incorrect - actual SOIC-8 pinout per datasheet: Pin 1 = D, Pin 2 = D, Pin 3 = D, Pin 4 = D, Pin 5 = S, Pin 6 = G, Pin 7 = S, Pin 8 = D)

Correction: Verified SOIC-8 pinout per Alpha & Omega AO4420A datasheet Rev 1 (Nov. 2010): Pin 1 = D, Pin 2 = D, Pin 3 = D, Pin 4 = D, Pin 5 = S, Pin 6 = G, Pin 7 = S, Pin 8 = D. Source terminals are Pins 5 and 7; Gate is Pin 6; all other pins (1,2,3,4,8) are Drain.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 8	Drain (D)	Main high-side current path; electrically tied to exposed copper pad for thermal conduction to PCB
5, 7	Source (S)	Return path for load current; dual-source pins reduce parasitic inductance in high-dI/dt switching
6	Gate (G)	Signal input requiring controlled slew rate to minimize EMI; sensitive to layout-induced ringing due to Crss = 168 pF

Key Features

Feature	Design Value
Advanced trench process	Enables sub-11 mΩ R_DS(ON) at 10 V while maintaining >30 V BVDSS margin
100% UIS tested	Guarantees avalanche ruggedness for unclamped inductive switching in synchronous rectifiers
Low Q_gd/Q_gs ratio	Q_gd = 8.6 nC / Q_gs = 4.6 nC → 1.87 ratio improves Miller immunity during high dV/dt transitions
Optimized body diode	V_SD = 0.76 V and t_rr = 22.5 ns reduce freewheeling losses and voltage spikes in non-overlap intervals
SOIC-8 with exposed drain	Enables 13.7 A continuous operation at T_A = 70°C without external heatsink (R_θJA = 40°C/W)

Applications

Server VRM	USB-C PD Adapter
Use Scenario: High-efficiency 48 V to 12 V intermediate bus converter in rack-mounted servers. IC Role / Device Role / Timing Role: Low-side synchronous rectifier in multiphase buck regulator, switching at 500 kHz–1 MHz. Use Value: R_DS(ON) < 10.5 mΩ minimizes conduction loss at 20–30 A per phase, improving system efficiency by ≥0.8% over 8 mΩ alternatives.	Use Scenario: Secondary-side synchronous rectification in 65 W USB-C Power Delivery adapters. IC Role / Device Role / Timing Role: N-channel switch replacing Schottky diode in flyback secondary, driven by controller's gate signal. Use Value: Q_rr = 12.5 nC and t_rr = 22.5 ns suppress voltage overshoot during diode commutation, enabling stable 20 V/3.25 A output without snubbers.
Industrial PLC I/O Module	Automotive Infotainment DC-DC
Use Scenario: 24 V input to 5 V/3.3 V point-of-load regulation for digital I/O isolation circuits. IC Role / Device Role / Timing Role: High-side switch in active OR-ing configuration for redundant 24 V supplies. Use Value: V_GS(th) = 0.6–2.0 V ensures clean turn-on with 3.3 V logic control, eliminating need for level-shifting circuitry.	Use Scenario: 12 V battery input to 5 V/1.2 V conversion for display and SoC power rails in head units. IC Role / Device Role / Timing Role: Low-side FET in buck converter operating under automotive temperature range (−40°C to 125°C). Use Value: R_DS(ON) variation ≤1.8× from 25°C to 125°C (per Fig. 4) maintains predictable thermal rise across junction temp swing.

Server VRM

USB-C PD Adapter

Use Scenario: High-efficiency 48 V to 12 V intermediate bus converter in rack-mounted servers.

IC Role / Device Role / Timing Role: Low-side synchronous rectifier in multiphase buck regulator, switching at 500 kHz–1 MHz.

Use Value: R_DS(ON) < 10.5 mΩ minimizes conduction loss at 20–30 A per phase, improving system efficiency by ≥0.8% over 8 mΩ alternatives.

Use Scenario: Secondary-side synchronous rectification in 65 W USB-C Power Delivery adapters.

IC Role / Device Role / Timing Role: N-channel switch replacing Schottky diode in flyback secondary, driven by controller's gate signal.

Use Value: Q_rr = 12.5 nC and t_rr = 22.5 ns suppress voltage overshoot during diode commutation, enabling stable 20 V/3.25 A output without snubbers.

Industrial PLC I/O Module

Automotive Infotainment DC-DC

Use Scenario: 24 V input to 5 V/3.3 V point-of-load regulation for digital I/O isolation circuits.

IC Role / Device Role / Timing Role: High-side switch in active OR-ing configuration for redundant 24 V supplies.

Use Value: V_GS(th) = 0.6–2.0 V ensures clean turn-on with 3.3 V logic control, eliminating need for level-shifting circuitry.

Use Scenario: 12 V battery input to 5 V/1.2 V conversion for display and SoC power rails in head units.

IC Role / Device Role / Timing Role: Low-side FET in buck converter operating under automotive temperature range (−40°C to 125°C).

Use Value: R_DS(ON) variation ≤1.8× from 25°C to 125°C (per Fig. 4) maintains predictable thermal rise across junction temp swing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRF7470PBF	R_DS(ON) = 11.5 mΩ @ 10 V; higher Q_g = 42 nC; TO-252 package	Larger footprint and higher thermal resistance (R_θJA ≈ 62°C/W) limits power density	Prefer AO4420A for space-constrained SOIC-8 layouts requiring <10.5 mΩ and low Q_g
Si2302DS-T1-E3	R_DS(ON) = 35 mΩ @ 4.5 V; SOT-23 package; lower I_D = 3.2 A	Only suitable for sub-5 W loads; insufficient current rating for AO4420A's 13.7 A use cases	Select AO4420A when ≥12 A continuous current and SOIC-8 thermal performance are required

Compared with IRF7470PBF and Si2302DS-T1-E3, the AO4420A provides superior power density via SOIC-8 packaging, lower conduction loss at 10 V drive, and tighter Q_g/Q_gd ratios-making it optimal for high-frequency, medium-power synchronous rectification where board area and thermal management are constrained.

Availability

AO4420A is available at Aetrix Electronics and suitable for server VRMs, USB-C PD adapters, and industrial PLC I/O modules requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for AO4420A 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, and industrial markets.

The AO4420A belongs to AOS's "AlphaMOS" trench-MOSFET product line, engineered specifically for high-efficiency, high-frequency DC-DC conversion in space- and thermally-constrained applications.

FAQ

What is the maximum continuous drain current for AO4420A at 70°C ambient temperature?

The AO4420A supports 9.7 A continuous drain current at T_A = 70°C (derated from 13.7 A at 25°C), based on its SOIC-8 thermal resistance (R_θJA = 40°C/W) and maximum junction temperature of 150°C. This rating assumes standard 1 in² FR-4 PCB with 2 oz copper and still air conditions. The AO4420A datasheet specifies this value explicitly in the Absolute Maximum Ratings table under "Continuous Drain Current, I_D".

Does AO4420A support 4.5 V logic-level gate drive?

Yes, the AO4420A is fully compatible with 4.5 V gate drive: its R_DS(ON) is guaranteed < 12 mΩ at V_GS = 4.5 V and I_D = 12.7 A, and its gate threshold voltage (V_GS(th) = 0.6–2.0 V) ensures strong enhancement-mode turn-on. This makes AO4420A suitable for direct drive from 3.3 V or 5 V microcontrollers and PWM controllers without level-shifting circuitry.

Is AO4420A rated for avalanche energy, and what is its repetitive rating?

Yes, the AO4420A is 100% UIS (Unclamped Inductive Switching) tested, with a specified repetitive avalanche energy (E_AR) of 60 mJ at L = 0.3 mH. This rating confirms ruggedness against inductive kickback in synchronous rectifier and motor drive applications. The AO4420A datasheet lists E_AR in the Absolute Maximum Ratings table and defines test conditions in the footnote section.

What is the gate-to-source leakage current specification for AO4420A?

The AO4420A specifies gate-to-source leakage current (I_GSS) as ≤ 100 nA at V_GS = ±12 V and T_J = 25°C. This ultra-low leakage ensures minimal standby power loss and stable gate bias in high-impedance drive configurations. The value is confirmed in the Electrical Characteristics table under "Gate-Body leakage current" with test condition V_DS = 0 V, V_GS = ±12 V.

Can AO4420A be used in automotive applications?

The AO4420A is qualified for the consumer market per its datasheet disclaimer and is not AEC-Q101 qualified. While it operates across −55°C to +150°C junction temperature, AOS explicitly states that "applications or uses as critical components in life support devices or systems are not authorized." For automotive infotainment or body electronics, AO4420A may be used only in non-safety-critical roles with full customer qualification; AO4420A is not recommended for ADAS, powertrain, or safety systems without additional validation.

AO4420A 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:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 30 V

Current - Continuous Drain (Id) @ 25°C:: 13.7A (Ta)

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

Rds On (Max) @ Id, Vgs:: 10.5mOhm @ 13.7A, 10V

Vgs(th) (Max) @ Id:: 2V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 36 nC @ 4.5 V

Vgs (Max):: ±12V

Input Capacitance (Ciss) (Max) @ Vds:: 4050 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

AO4420A FAQ

1.How can I place an order for AO4420A through Aetrix?

Please submit a Request for Quotation (RFQ) for AO4420A 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 AO4420A reliable?

The price and inventory of AO4420A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AO4420A is usually 5 days.

3.What payment methods are accepted for AO4420A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AO4420A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AO4420A?

AO4420A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AO4420A 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 AO4420A?

For technical support, including AO4420A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AO4420A requirements.

6.How does Aetrix verify that AO4420A is sourced from the original manufacturer or authorized distributors?

All AO4420A 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 AO4420A meets industry standards.

7.What is the process for return or replacement of AO4420A?

All AO4420A units undergo pre-shipment inspection (PSI). If there is an issue with AO4420A, 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 AO4420A part is unused and in its original packaging.

Return procedure for AO4420A:

1.Submit a request within 90 days.

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

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