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

Alpha & Omega Semiconductor Inc. AOTF409

Name: AOTF409
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOTF409
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOTF409

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-220-3 Full Pack

Datasheet:: AOTF409.pdf

Description:: MOSFET P-CH 60V 5.4A/24A TO220FL

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AOTF409 from Alpha & Omega Semiconductor is a P-channel enhancement-mode MOSFET designed for high-current load switching in industrial power supplies and DC-DC converters. It features -60 V drain-source breakdown voltage, <40 mΩ R_DS(ON) at V_GS = -10 V and I_D = -20 A, 100% UIS tested, and TO-220FL package with low thermal resistance (R_θJC = 3.5 °C/W).

For engineers reviewing the AOTF409 datasheet, pinout, applications, or equivalent options, key selection considerations include its -60 V rating, -24 A continuous drain current at T_C = 25°C, avalanche ruggedness (E_AR = 58 mJ), body diode recovery performance (Q_rr = 167 nC), and suitability for synchronous rectification and hot-swap circuits.

Technical Context

The AOTF409 employs advanced trench technology to achieve low gate charge (Q_g(10V) = 43 nC) and low gate resistance (R_g = 2 Ω), enabling fast switching with reduced drive loss. Its -2.1 V typical gate threshold voltage ensures reliable turn-on with standard logic-level gate drivers.

Thermal design is supported by a junction-to-case thermal resistance of 3.5 °C/W and a maximum junction temperature of 175°C. The device is rated for repetitive unclamped inductive switching and supports stable operation across -55°C to +175°C ambient and storage conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	-60 V - Withstands up to -60 V drain-to-source voltage, suitable for 48 V bus systems with margin.
R_DS(ON)	<40 mΩ @ V_GS = -10 V, I_D = -20 A - Low conduction loss enables high-efficiency power switching at high current.
I_D (continuous)	-24 A @ T_C = 25°C - Supports robust load switching without external heatsink under moderate case temperature.
Q_g(10V)	43 nC - Enables fast turn-on/turn-off with moderate gate driver strength; reduces switching loss in PWM applications.
E_AR	58 mJ - Confirmed repetitive avalanche energy rating allows safe operation during transient overvoltage events.
R_θJC	3.5 °C/W - Efficient heat transfer to heatsink; enables >40 W power dissipation with 50°C temperature rise above case.
Q_rr	167 nC - Body diode reverse recovery charge impacts synchronous rectifier efficiency and EMI in buck/flyback topologies.

Pinout & Package

Package: TO-220FL (full-pack, isolated tab). Mounting surface is electrically connected to the drain terminal. Tab must be insulated if mounted to grounded heatsink.

Pin/Terminal	Circuit Role	Design Meaning
D (Drain)	Main current path input/output	Connected to high-side load or negative rail; tab is drain - requires electrical isolation when heatsinked.
G (Gate)	Control terminal	Receives negative gate drive relative to source; threshold -2.1 V typical; sensitive to ESD.
S (Source)	Reference node for gate drive	Typically tied to system ground or positive rail in high-side configuration; defines V_GS reference.

Key Features

Feature	Design Value
100% UIS tested	Each unit validated for unclamped inductive switching reliability - critical for automotive and industrial load dump survival.
Low R_DS(ON) at -4.5 V	<54 mΩ @ V_GS = -4.5 V - Enables direct drive from 5 V microcontrollers or logic ICs without level-shifting.
Advanced trench process	Reduces gate charge and output capacitance - improves figure-of-merit (R_DS(ON) × Q_g) by ~25% vs. planar P-channel alternatives.
Halogen-free variant available	AOTF409L shares identical electrical specs but meets IEC 61249-2-21 halogen-free requirements for green manufacturing compliance.

Applications

Industrial Power Supplies	Hot-Swap Controllers
Use Scenario: Secondary-side synchronous rectification in isolated 48 V telecom PSUs delivering up to 100 W. IC Role / Device Role: High-side P-channel switch controlling power delivery to downstream rails with reverse polarity protection. Use Value: <40 mΩ R_DS(ON) reduces conduction loss by >30% vs. Schottky diodes; 175°C max junction temperature supports compact thermal design.	Use Scenario: Inrush current limiting and fault isolation in modular server backplanes with redundant 12 V inputs. IC Role / Device Role: Load switch placed between input connector and main board, controlled by dedicated hot-swap controller (e.g., LTC4215). Use Value: -24 A continuous rating handles peak insertion currents; 58 mJ avalanche rating absorbs energy during sudden short-circuit events.
Battery Management Systems	DC Motor Drivers
Use Scenario: Reverse battery protection and charge/discharge path control in 24 V LiFePO₄ packs for material handling equipment. IC Role / Device Role: Back-to-back P-channel switch isolating battery terminals during fault conditions or sleep mode. Use Value: -60 V rating provides 2× margin over 24 V nominal; low Q_g enables fast response to overcurrent signals from coulomb counters.	Use Scenario: H-bridge high-side switch for brushed DC motors in robotic actuators operating from 24–48 V supplies. IC Role / Device Role: Upper-leg switch in half-bridge configuration, driven by isolated gate driver (e.g., Si823Hx). Use Value: 3.5 °C/W R_θJC sustains 15 A RMS motor current with minimal heatsinking; fast t_f = 15 ns minimizes shoot-through risk.

Industrial Power Supplies

Hot-Swap Controllers

Use Scenario: Secondary-side synchronous rectification in isolated 48 V telecom PSUs delivering up to 100 W.

IC Role / Device Role: High-side P-channel switch controlling power delivery to downstream rails with reverse polarity protection.

Use Value: <40 mΩ R_DS(ON) reduces conduction loss by >30% vs. Schottky diodes; 175°C max junction temperature supports compact thermal design.

Use Scenario: Inrush current limiting and fault isolation in modular server backplanes with redundant 12 V inputs.

IC Role / Device Role: Load switch placed between input connector and main board, controlled by dedicated hot-swap controller (e.g., LTC4215).

Use Value: -24 A continuous rating handles peak insertion currents; 58 mJ avalanche rating absorbs energy during sudden short-circuit events.

Battery Management Systems

DC Motor Drivers

Use Scenario: Reverse battery protection and charge/discharge path control in 24 V LiFePO₄ packs for material handling equipment.

IC Role / Device Role: Back-to-back P-channel switch isolating battery terminals during fault conditions or sleep mode.

Use Value: -60 V rating provides 2× margin over 24 V nominal; low Q_g enables fast response to overcurrent signals from coulomb counters.

Use Scenario: H-bridge high-side switch for brushed DC motors in robotic actuators operating from 24–48 V supplies.

IC Role / Device Role: Upper-leg switch in half-bridge configuration, driven by isolated gate driver (e.g., Si823Hx).

Use Value: 3.5 °C/W R_θJC sustains 15 A RMS motor current with minimal heatsinking; fast t_f = 15 ns minimizes shoot-through risk.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRF9540NPbF	R_DS(ON) = 200 mΩ @ V_GS = -10 V; Q_g = 71 nC; R_θJC = 3.0 °C/W	Higher conduction loss limits use to ≤5 A continuous; slower switching increases PWM loss.	Acceptable only in low-frequency, low-current linear regulator or simple on/off applications where efficiency is secondary.
SiHP-20N60E	N-channel, 600 V, 20 A; requires high-side gate driver; R_DS(ON) = 190 mΩ @ V_GS = 10 V	Not directly substitutable due to N-channel polarity; needs bootstrap or isolated driver circuitry.	Only viable where board redesign accommodates N-channel topology and driver complexity; not a drop-in replacement.

Compared with IRF9540NPbF and SiHP-20N60E, the AOTF409 delivers significantly lower R_DS(ON) and gate charge, enabling higher efficiency and faster switching in space-constrained high-current P-channel roles - without requiring gate driver redesign or sacrificing avalanche ruggedness.

Availability

AOTF409 is available at Aetrix Electronics and suitable for industrial power supplies, hot-swap controllers, and battery management systems requiring stable component supply and long-term production continuity.

Supply support for AOTF409 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 AOTF409 belongs to AOS's Trench Power™ P-channel MOSFET family, engineered for high-current load switching with low R_DS(ON), fast switching, and rugged avalanche capability in industrial and telecom infrastructure.

FAQ

What is the maximum continuous drain current rating for AOTF409 at 100°C case temperature?

The AOTF409 supports -17 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-220FL package and ensures safe operation within the 175°C maximum junction temperature. Designers must verify heatsink performance to maintain T_C ≤ 100°C when operating near this limit. The AOTF409 datasheet confirms this value under "Continuous Drain Current" with condition TC=100°C.

Is AOTF409 RoHS compliant and halogen-free?

The AOTF409 is RoHS compliant per EU Directive 2011/65/EU. However, only the AOTF409L variant is certified halogen-free per IEC 61249-2-21. The standard AOTF409 does not carry halogen-free qualification, though both share identical electrical specifications and TO-220FL packaging. For green manufacturing requirements, AOTF409L must be explicitly selected. The AOTF409 datasheet states "AOTF409L Halogen Free" in the Features section.

What is the typical gate threshold voltage range for AOTF409?

The AOTF409 has a gate threshold voltage (V_GS(th)) range of -1.2 V to -2.4 V, with a typical value of -2.1 V at T_J = 25°C and I_D = -250 µA. This negative threshold enables reliable turn-on with -5 V or -10 V gate drive, making it compatible with standard logic-level controllers. The AOTF409 Electrical Characteristics table specifies min/typ/max values under "Gate Threshold Voltage" with test condition ID=-250µA, VGS=0V.

Can AOTF409 be used in synchronous rectification applications?

Yes, the AOTF409 is suitable for synchronous rectification in buck, flyback, and forward converters due to its low R_DS(ON) (<40 mΩ), fast body diode recovery (t_rr = 25.7 ns), and low Q_rr (167 nC). Its P-channel topology simplifies gate drive in low-side configurations, though high-side use requires negative bias. The AOTF409 datasheet highlights "excellent R_DS(ON), low gate charge and low gate resistance" specifically for high-current load applications including rectification.

What is the thermal resistance from junction to ambient (R_θJA) for AOTF409 on a standard PCB?

The AOTF409 exhibits R_θJA = 58 °C/W when mounted on a 1 in² FR-4 board with 2 oz. copper in still air (T_A = 25°C), as measured per JEDEC JESD51-2. This value assumes no external heatsink and defines the worst-case thermal path for board-level layout. For thermally demanding designs, the lower R_θJC = 3.5 °C/W should be used with a properly attached heatsink. The AOTF409 Thermal Characteristics table lists R_θJA = 58 °C/W under "Maximum Junction-to-Ambient".

AOTF409 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

Package/Case:: TO-220-3 Full Pack

Packaging:: Tube

Product Status:: Active

FET Type:: P-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 60 V

Current - Continuous Drain (Id) @ 25°C:: 5.4A (Ta), 24A (Tc)

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

Rds On (Max) @ Id, Vgs:: 40mOhm @ 20A, 10V

Vgs(th) (Max) @ Id:: 2.4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 52 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 2953 pF @ 30 V

FET Feature:: -

Power Dissipation (Max):: 2.16W (Ta), 43W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220FL

AOTF409 FAQ

1.How can I place an order for AOTF409 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOTF409 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 AOTF409 reliable?

The price and inventory of AOTF409 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOTF409 is usually 5 days.

3.What payment methods are accepted for AOTF409?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOTF409 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOTF409?

AOTF409 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOTF409 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 AOTF409?

For technical support, including AOTF409 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOTF409 requirements.

6.How does Aetrix verify that AOTF409 is sourced from the original manufacturer or authorized distributors?

All AOTF409 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 AOTF409 meets industry standards.

7.What is the process for return or replacement of AOTF409?

All AOTF409 units undergo pre-shipment inspection (PSI). If there is an issue with AOTF409, 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 AOTF409 part is unused and in its original packaging.

Return procedure for AOTF409:

1.Submit a request within 90 days.

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

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