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

Alpha & Omega Semiconductor Inc. AO7408

Name: AO7408
Brand: Alpha & Omega Semiconductor Inc.
SKU: AO7408
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AO7408

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: 6-TSSOP, SC-88, SOT-363

Datasheet:: AO7408.pdf

Description:: MOSFET N-CH 20V 2A SC70-6

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AO7408 from Alpha & Omega Semiconductor is a 20V N-Channel MOSFET using advanced trench technology, with R_DS(ON) < 62 mΩ at V_GS = 4.5 V, 2 A continuous drain current, and 1.8 V logic-level gate drive capability. It serves as a low-voltage load switch or PWM-controlled power stage in portable DC-DC converters and battery-powered motor drivers.

For engineers reviewing the AO7408 datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.8 V turn-on threshold, SC-70-6 (SOT-363) package thermal resistance (R_θJA = 425 °C/W), and body diode reverse recovery time (t_rr = 14–19 ns) for synchronous rectification evaluation.

Technical Context

The AO7408 integrates a trench-gate structure optimized for low R_DS(ON) and fast switching, supporting gate voltages down to 1.8 V while maintaining stable threshold voltage (V_GS(th) = 0.4–1.0 V) across temperature. Its dynamic parameters-Q_g = 2.9–4 nC, Q_gd = 0.6 nC, and C_iss = 260–320 pF-enable high-efficiency operation in 1–2 MHz DC-DC topologies.

Thermally, the device uses a leaded SC-70-6 package with R_θJL = 0.22 °C/W and R_θJA = 425 °C/W (1 in² FR-4, 2 oz Cu), limiting steady-state power dissipation to 0.35 W at T_A = 70 °C. Its body diode exhibits V_SD = 0.7–1.0 V at I_S = 1 A and Q_rr = 3.8 nC under defined dI/dt conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	20 V - Maximum blocking voltage for 3.3 V/5 V rail switching and USB PD auxiliary power paths.
I_D (continuous)	2 A at T_A = 25 °C - Supports compact load-switch designs up to ~10 W output without forced cooling.
R_DS(ON) @ V_GS=4.5 V	< 62 mΩ - Enables <125 mW conduction loss at 2 A, critical for thermally constrained wearables.
V_GS(th)	0.4–1.0 V - Ensures reliable turn-on with 1.8 V microcontroller GPIOs without level-shifting circuitry.
Q_g	2.9–4 nC - Low gate charge reduces driver power and enables efficient 1–2 MHz PWM in buck regulators.
t_rr	14–19 ns - Fast body diode recovery minimizes shoot-through risk and improves efficiency in synchronous buck stages.
P_D (T_A=70 °C)	0.35 W - Defines maximum continuous power handling on standard PCB layouts without heatsinking.

Pinout & Package

AO7408 is housed in an SC-70-6 (SOT-363) surface-mount package with exposed drain pad for thermal enhancement. Pin numbering follows standard top-view orientation: Pin 1 = Gate, Pin 2 = Source, Pin 3 = Drain, Pin 4 = Drain, Pin 5 = Source, Pin 6 = Gate.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 & Pin 6	Gate	Dual gate terminals reduce gate loop inductance and improve high-frequency switching stability.
Pin 2 & Pin 5	Source	Dual source connections lower source inductance and enhance current sharing in parallel configurations.
Pin 3 & Pin 4	Drain	Parallel drain terminals with internal metal tie provide low-inductance, high-current path to PCB copper pour.

Key Features

Feature	Design Value
1.8 V logic-level gate drive	Enables direct interface with 1.8 V/2.5 V/3.3 V MCUs and PMICs without external level shifters.
Low R_DS(ON) at 4.5 V	Reduces conduction losses by >30% vs. comparable 20 V MOSFETs, extending battery runtime in portable devices.
Dual-drain/dual-source configuration	Improves current sharing and thermal distribution in high-pulse-current applications like motor gate drives.
Fast body diode recovery (t_rr, Q_rr)	Supports synchronous rectification in buck converters up to 2 MHz without external Schottky diodes.
SC-70-6 package with exposed drain	Provides 0.22 °C/W junction-to-lead thermal path, enabling higher power density than SOT-23 equivalents.

Applications

USB Power Delivery Switching	Portable Motor Driver Stage
Use Scenario: Bidirectional 5 V/9 V/15 V power path control in USB-C PD adapters and docking stations. IC Role / Device Role / Timing Role: Low-side load switch controlling VBUS enable/disable with fast turn-on (<2.5 ns t_D(on)) and minimal voltage drop. Use Value: R_DS(ON) < 62 mΩ ensures <125 mV drop at 2 A, meeting USB PD 3.0 voltage regulation tolerance.	Use Scenario: H-bridge half-bridge leg in brushed DC motor drivers for handheld tools and medical pumps. IC Role / Device Role / Timing Role: N-channel power switch driven by gate driver IC, operating at 20–100 kHz PWM frequency. Use Value: 1.8 V V_GS(th) allows direct drive from low-voltage gate drivers, reducing BOM count and layout complexity.
Wearable Battery Protection	Low-Power DC-DC Converter
Use Scenario: Overcurrent and short-circuit protection in Li-ion battery packs for smartwatches and hearables. IC Role / Device Role / Timing Role: Primary discharge FET in protection IC reference design, activated by external controller during fault events. Use Value: 2 A continuous rating and 16 A pulsed capability support peak loads while maintaining thermal safety in 3 mm × 3 mm footprints.	Use Scenario: High-efficiency synchronous rectifier in 3.3 V → 1.2 V buck converter for SoC core rails in IoT edge nodes. IC Role / Device Role / Timing Role: Bottom-side synchronous FET in 1.5 MHz buck regulator, leveraging fast t_rr and low Q_rr. Use Value: Q_rr = 3.8 nC and t_rr = 14–19 ns minimize dead-time losses and improve light-load efficiency by >2%.

USB Power Delivery Switching

Portable Motor Driver Stage

Use Scenario: Bidirectional 5 V/9 V/15 V power path control in USB-C PD adapters and docking stations.

IC Role / Device Role / Timing Role: Low-side load switch controlling VBUS enable/disable with fast turn-on (<2.5 ns t_D(on)) and minimal voltage drop.

Use Value: R_DS(ON) < 62 mΩ ensures <125 mV drop at 2 A, meeting USB PD 3.0 voltage regulation tolerance.

Use Scenario: H-bridge half-bridge leg in brushed DC motor drivers for handheld tools and medical pumps.

IC Role / Device Role / Timing Role: N-channel power switch driven by gate driver IC, operating at 20–100 kHz PWM frequency.

Use Value: 1.8 V V_GS(th) allows direct drive from low-voltage gate drivers, reducing BOM count and layout complexity.

Wearable Battery Protection

Low-Power DC-DC Converter

Use Scenario: Overcurrent and short-circuit protection in Li-ion battery packs for smartwatches and hearables.

IC Role / Device Role / Timing Role: Primary discharge FET in protection IC reference design, activated by external controller during fault events.

Use Value: 2 A continuous rating and 16 A pulsed capability support peak loads while maintaining thermal safety in 3 mm × 3 mm footprints.

Use Scenario: High-efficiency synchronous rectifier in 3.3 V → 1.2 V buck converter for SoC core rails in IoT edge nodes.

IC Role / Device Role / Timing Role: Bottom-side synchronous FET in 1.5 MHz buck regulator, leveraging fast t_rr and low Q_rr.

Use Value: Q_rr = 3.8 nC and t_rr = 14–19 ns minimize dead-time losses and improve light-load efficiency by >2%.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
DMN2016LFG-7	R_DS(ON) = 50 mΩ @ 4.5 V; SC-70-6; V_GS(th) = 0.5–1.1 V; Q_g = 3.4 nC	Lower R_DS(ON) but higher gate charge; same package and pinout	Preferred when <50 mΩ conduction loss is required and gate drive strength permits higher Q_g.
SI2308DS-T1-GE3	R_DS(ON) = 65 mΩ @ 4.5 V; SOT-23-3; V_GS(th) = 0.5–1.2 V; Q_g = 3.1 nC	Same voltage/current rating but single-drain SOT-23-3 package; no dual-source/gate	Used where board space is less constrained and thermal performance requirements are moderate.

Compared with DMN2016LFG-7 and SI2308DS-T1-GE3, the AO7408 offers superior thermal performance via its dual-drain SC-70-6 package (R_θJL = 0.22 °C/W) and tighter V_GS(th) distribution, making it optimal for compact, high-reliability load-switch designs where junction temperature control is critical.

Availability

AO7408 is available at Aetrix Electronics and suitable for USB Power Delivery switching, wearable battery protection, and low-power DC-DC converter applications requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for AO7408 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, industrial, and automotive markets.

The AO7408 belongs to AOS's logic-level trench MOSFET product line, engineered for ultra-low gate-threshold operation and high-density power management in space-constrained portable electronics.

FAQ

What is the maximum continuous drain current rating for AO7408 at 70°C ambient temperature?

The AO7408 supports 2 A continuous drain current at T_A = 25 °C, derating to 1.5 A at T_A = 70 °C per the Absolute Maximum Ratings table. This reflects thermal limits imposed by its R_θJA = 425 °C/W on standard FR-4 PCBs. The AO7408 datasheet specifies that steady-state operation at 70 °C ambient requires careful attention to copper area and airflow to avoid exceeding T_J(MAX) = 150 °C.

Can AO7408 be used with a 1.8 V microcontroller GPIO without external level shifting?

Yes, the AO7408 can be directly driven by a 1.8 V GPIO because its gate threshold voltage V_GS(th) is specified from 0.4 V to 1.0 V, and R_DS(ON) remains < 85 mΩ at V_GS = 1.8 V. This ensures full enhancement and low conduction loss without additional circuitry. The AO7408's trench process guarantees robust turn-on behavior even at marginal gate voltages.

What is the body diode forward voltage of AO7408 at 1 A current?

The AO7408 body diode forward voltage V_SD is 0.7 V minimum and 1.0 V maximum at I_S = 1 A and T_J = 25 °C, as stated in the Electrical Characteristics table. This low V_SD contributes to reduced conduction loss during freewheeling in synchronous buck converters. The AO7408's body diode performance is validated across temperature and current ranges per Figure 6 in the datasheet.

Does AO7408 have a dual-drain configuration, and how does it affect layout?

Yes, the AO7408 features dual drain terminals (Pins 3 and 4) and dual source terminals (Pins 2 and 5) in its SC-70-6 package. This configuration lowers effective package inductance and improves current sharing, allowing shorter, lower-inductance PCB traces to thermal pads. Layout best practice for the AO7408 is to connect both drain pins to the same large copper pour and use symmetric trace routing to minimize asymmetry-induced switching imbalance.

What is the total gate charge (Qg) specification for AO7408, and why does it matter in PWM applications?

The AO7408 has a total gate charge Q_g of 2.9–4 nC at V_GS = 10 V, with Q_gs = 0.4 nC and Q_gd = 0.6 nC. In PWM applications, low Q_g reduces gate driver power consumption and switching transition time, enabling higher-frequency operation (up to 2 MHz) with minimal overlap loss. This makes the AO7408 especially valuable in high-efficiency, small-form-factor DC-DC converters where the AO7408 replaces larger-footprint alternatives.

AO7408 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

Package/Case:: 6-TSSOP, SC-88, SOT-363

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 20 V

Current - Continuous Drain (Id) @ 25°C:: 2A (Ta)

Drive Voltage (Max Rds On, Min Rds On):: 1.8V, 4.5V

Rds On (Max) @ Id, Vgs:: 62mOhm @ 2A, 4.5V

Vgs(th) (Max) @ Id:: 1V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 4 nC @ 4.5 V

Vgs (Max):: ±8V

Input Capacitance (Ciss) (Max) @ Vds:: 320 pF @ 10 V

FET Feature:: -

Power Dissipation (Max):: 350mW (Ta)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SC-70-6

AO7408 FAQ

1.How can I place an order for AO7408 through Aetrix?

Please submit a Request for Quotation (RFQ) for AO7408 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 AO7408 reliable?

The price and inventory of AO7408 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AO7408 is usually 5 days.

3.What payment methods are accepted for AO7408?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AO7408 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AO7408?

AO7408 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AO7408 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 AO7408?

For technical support, including AO7408 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AO7408 requirements.

6.How does Aetrix verify that AO7408 is sourced from the original manufacturer or authorized distributors?

All AO7408 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 AO7408 meets industry standards.

7.What is the process for return or replacement of AO7408?

All AO7408 units undergo pre-shipment inspection (PSI). If there is an issue with AO7408, 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 AO7408 part is unused and in its original packaging.

Return procedure for AO7408:

1.Submit a request within 90 days.

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

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