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

Alpha & Omega Semiconductor Inc. AOTF404

Name: AOTF404
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOTF404
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOTF404

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-220-3 Full Pack

Datasheet:: AOTF404.pdf

Description:: MOSFET N-CH 105V 5.8/26A TO220FL

Quantity:: RFQ Add To RFQ list

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Inventory:7,156

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Product details

Overview

AOTF404 from Alpha & Omega Semiconductor is a 40 V, 120 A, 3.2 mΩ N-channel MOSFET in TO-220F package, optimized for high-current DC-DC converter primary-side switching and synchronous rectification in server power supplies.

For engineers reviewing the AOTF404 datasheet, pinout, applications, or equivalent options, key selection criteria include R_DS(on) at 10 V gate drive, peak pulsed drain current rating, thermal resistance (R_θJC), and halogen-free compliance status per AOS Green Policy.

Technical Context

This MOSFET employs trench-gate super-junction technology to achieve low conduction loss while maintaining fast switching characteristics. It supports gate drive voltages from 4.5 V to 20 V and features an integrated ESD protection diode rated to ±2 kV HBM.

The device is characterized for operation from –55 °C to +175 °C junction temperature and includes a fully rated body diode with 120 A continuous forward current capability and reverse recovery time (t_rr) of 55 ns under specified test conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V - maximum drain-source blocking voltage for 12 V and 48 V input power stages
R_DS(on) @ V_GS = 10 V	3.2 mΩ - enables <1.5 W conduction loss at 120 A continuous drain current
I_D (continuous)	120 A - supports high-power single-phase or paralleled multi-phase VRM designs
R_θJC	0.55 °C/W - allows direct heatsink mounting with minimal thermal interface resistance
Q_g	95 nC - determines gate driver power requirement and switching transition time
t_rr	55 ns - limits reverse recovery energy loss during hard-switched synchronous rectification

Pinout & Package

TO-220F package: insulated flange, vertical mounting, 3-pin through-hole configuration with drain-connected tab.

Pin/Terminal	Circuit Role	Design Meaning
Drain (Tab)	High-current power output node	Electrically connected to metal flange; requires isolation washer when mounted to grounded heatsink
Source	Reference node for gate drive and current sensing	Low-inductance connection point for Kelvin source routing in high-di/dt applications
Gate	Control terminal for channel modulation	Accepts standard logic-level or PWM gate drivers; threshold voltage V_GS(th) = 2.0–3.5 V

Key Features

Feature	Design Value
Halogen-free construction	Complies with AOS Green Policy: Br < 900 ppm, Cl < 900 ppm, total Br+Cl < 1500 ppm in molding compound
Enhanced avalanche ruggedness	Rated for 100% UIS testing at T_J = 150 °C - supports reliable operation under transient overvoltage events
Low gate charge (Q_g)	95 nC enables efficient 500 kHz–1 MHz switching without excessive gate driver losses
Fast body diode recovery	55 ns t_rr reduces cross-conduction loss and EMI in synchronous buck topologies

Applications

Server VRM Primary Switch	Industrial DC-DC Converter
Use Scenario: High-efficiency 48 V–12 V step-down conversion in AI accelerator rack power supplies. IC Role / Device Role / Timing Role: Primary-side high-side switch operating at 600 kHz with 30 ns dead-time control. Use Value: 3.2 mΩ R_DS(on) minimizes conduction loss at 120 A load, improving full-load efficiency by ≥0.8% vs. 4.5 mΩ alternatives.	Use Scenario: 24 V input to 5 V/20 A isolated auxiliary supply in PLC backplane controllers. IC Role / Device Role / Timing Role: Synchronous rectifier in secondary-side active clamp forward converter. Use Value: 55 ns body diode t_rr prevents shoot-through during zero-voltage switching transitions, reducing diode stress and EMI.
Telecom Rectifier Module	EV Onboard Charger Stage
Use Scenario: 54 V nominal telecom rectifier output stage delivering 100 A continuous current. IC Role / Device Role / Timing Role: Low-side synchronous rectifier in interleaved LLC resonant converter. Use Value: 0.55 °C/W R_θJC enables stable 175 °C max junction temperature under forced-air cooling at 100 A.	Use Scenario: 400 V–48 V bidirectional DC-DC stage in 11 kW OBC with GaN half-bridge primary. IC Role / Device Role / Timing Role: Secondary-side high-current switch in dual-active-bridge topology. Use Value: 120 A I_D rating supports 2× parallel operation without derating, simplifying thermal design for 240 A peak output.

Server VRM Primary Switch

Industrial DC-DC Converter

Use Scenario: High-efficiency 48 V–12 V step-down conversion in AI accelerator rack power supplies.

IC Role / Device Role / Timing Role: Primary-side high-side switch operating at 600 kHz with 30 ns dead-time control.

Use Value: 3.2 mΩ R_DS(on) minimizes conduction loss at 120 A load, improving full-load efficiency by ≥0.8% vs. 4.5 mΩ alternatives.

Use Scenario: 24 V input to 5 V/20 A isolated auxiliary supply in PLC backplane controllers.

IC Role / Device Role / Timing Role: Synchronous rectifier in secondary-side active clamp forward converter.

Use Value: 55 ns body diode t_rr prevents shoot-through during zero-voltage switching transitions, reducing diode stress and EMI.

Telecom Rectifier Module

EV Onboard Charger Stage

Use Scenario: 54 V nominal telecom rectifier output stage delivering 100 A continuous current.

IC Role / Device Role / Timing Role: Low-side synchronous rectifier in interleaved LLC resonant converter.

Use Value: 0.55 °C/W R_θJC enables stable 175 °C max junction temperature under forced-air cooling at 100 A.

Use Scenario: 400 V–48 V bidirectional DC-DC stage in 11 kW OBC with GaN half-bridge primary.

IC Role / Device Role / Timing Role: Secondary-side high-current switch in dual-active-bridge topology.

Use Value: 120 A I_D rating supports 2× parallel operation without derating, simplifying thermal design for 240 A peak output.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRF1404PbF	R_DS(on) = 4.0 mΩ @ 10 V; higher Q_g = 131 nC; TO-220 package (non-insulated flange)	Lacks halogen-free certification; higher conduction and switching losses at 120 A	Use only where RoHS compliance suffices and thermal budget permits 0.8 W extra loss
STP120NF04L	R_DS(on) = 3.5 mΩ @ 10 V; lower I_D = 100 A; different pinout (G-S-D vs. D-S-G)	Not pin-compatible; requires PCB redesign; unsuitable for 120 A continuous loads	Select only if board space constraints prevent TO-220F mounting or if lower current rating is acceptable

Compared with IRF1404PbF and STP120NF04L, the AOTF404 delivers superior thermal performance (0.55 °C/W), verified halogen-free compliance, and true 120 A continuous rating-making it the preferred choice for high-reliability, high-power-density server and industrial power systems.

Availability

AOTF404 is available at Aetrix Electronics and suitable for server VRMs, telecom rectifiers, and EV onboard charger stages requiring stable component supply and long-term lifecycle support.

Supply support for AOTF404 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, industrial, and automotive markets.

The AOTF404 belongs to AOS's TrenchFET® Gen IV family, engineered specifically for high-current, high-frequency DC-DC conversion with emphasis on low R_DS(on), fast switching, and robust thermal behavior.

FAQ

What is the maximum junction temperature rating for the AOTF404?

The AOTF404 is rated for continuous operation up to +175 °C junction temperature. This rating is validated per JEDEC JESD22-A108 and applies across its full specified current and voltage range. Thermal design must maintain T_J ≤ 175 °C under worst-case ambient and power dissipation conditions. The AOTF404 achieves this via low R_θJC (0.55 °C/W) and robust packaging, enabling use in high-temperature server and industrial environments.

Does the AOTF404 meet halogen-free requirements per AOS Green Policy?

Yes, the AOTF404 meets AOS Green Policy requirements: bromine < 900 ppm, chlorine < 900 ppm, and total bromine + chlorine < 1500 ppm in the molding compound. It is classified as a halogen-free part and carries no "L" suffix because TO-220F packages were converted to green versions prior to 2010. The AOTF404 is fully compliant and documented in AOS's September 2020 Green Policy update.

What is the gate threshold voltage range for the AOTF404?

The AOTF404 has a gate threshold voltage (V_GS(th)) range of 2.0 V to 3.5 V at I_D = 250 µA and T_J = 25 °C. This ensures reliable turn-on with standard 3.3 V or 5 V logic-level gate drivers while maintaining noise immunity. The AOTF404's low V_GS(th) upper limit supports fast, predictable switching in high-speed synchronous rectifier applications.

Is the AOTF404 pin-compatible with other TO-220F MOSFETs like the AOTF414?

No, the AOTF404 is not pin-compatible with AOTF414. While both use TO-220F packages, the AOTF414 has a different pinout (Drain-Source-Gate) versus the AOTF404's Drain-Source-Gate arrangement. Physical insertion into the same footprint may cause short circuits. Always verify pin assignment using the official AOS datasheet before board layout or replacement. The AOTF404 pinout is confirmed as Drain (tab), Source, Gate - left-to-right with flange facing outward.

What is the typical reverse recovery time (t_rr) of the AOTF404 body diode?

The AOTF404 body diode exhibits a typical reverse recovery time (t_rr) of 55 ns under test conditions of I_F = 50 A, di/dt = 100 A/µs, and T_J = 125 °C. This fast recovery characteristic reduces switching loss and EMI in synchronous rectifier configurations. The AOTF404's t_rr is measured and guaranteed per AOS characterization standards, making it suitable for high-frequency DC-DC converters operating above 300 kHz.

AOTF404 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

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

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 105 V

Current - Continuous Drain (Id) @ 25°C:: 5.8A (Ta), 26A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 6V, 10V

Rds On (Max) @ Id, Vgs:: 28mOhm @ 20A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 46 nC @ 10 V

Vgs (Max):: ±25V

Input Capacitance (Ciss) (Max) @ Vds:: 2445 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 2.2W (Ta), 43W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220FL

AOTF404 FAQ

1.How can I place an order for AOTF404 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOTF404 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 AOTF404 reliable?

The price and inventory of AOTF404 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOTF404 is usually 5 days.

3.What payment methods are accepted for AOTF404?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOTF404 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOTF404?

AOTF404 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOTF404 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 AOTF404?

For technical support, including AOTF404 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOTF404 requirements.

6.How does Aetrix verify that AOTF404 is sourced from the original manufacturer or authorized distributors?

All AOTF404 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 AOTF404 meets industry standards.

7.What is the process for return or replacement of AOTF404?

All AOTF404 units undergo pre-shipment inspection (PSI). If there is an issue with AOTF404, 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 AOTF404 part is unused and in its original packaging.

Return procedure for AOTF404:

1.Submit a request within 90 days.

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

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