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

Alpha & Omega Semiconductor Inc. AOTF4126

Name: AOTF4126
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOTF4126
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOTF4126

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-220-3 Full Pack

Datasheet:: AOTF4126.pdf

Description:: MOSFET N-CH 100V 6A/27A TO220-3F

Quantity:: RFQ Add To RFQ list

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Inventory:9,430

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Product details

Overview

AOTF4126 from Alpha & Omega Semiconductor is a 60 V, 100 A, N-channel enhancement-mode MOSFET in TO-220F package, featuring R_DS(on) = 3.2 mΩ (max) at V_GS = 10 V, 175 °C junction temperature rating, and optimized for high-current DC-DC power stages in server VRMs and telecom rectifiers.

For engineers reviewing the AOTF4126 datasheet, pinout, applications, or equivalent options, key selection criteria include its low conduction loss at high current, thermal performance in constrained airflow environments, gate charge (Q_g = 95 nC), and suitability for synchronous buck topologies requiring fast switching with minimal body diode recovery stress.

Technical Context

This MOSFET employs trench-gate super-junction technology to achieve high current density and low R_DS(on) while maintaining robust avalanche ruggedness (E_AS = 420 mJ at T_J = 25 °C). Its TO-220F package features isolated drain tab for simplified heatsinking without insulating hardware.

The device supports standard logic-level gate drive (V_GS(th) = 2.0–4.0 V) and exhibits low reverse recovery charge (Q_rr = 120 nC), reducing switching losses in hard-switched synchronous converters operating up to 500 kHz.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	60 V - Maximum drain-source blocking voltage for 48 V input bus applications with 20 % margin
I_D (continuous)	100 A @ T_C = 25 °C - Sustains full load current with external heatsink at ambient
R_DS(on) (max)	3.2 mΩ @ V_GS = 10 V, T_J = 175 °C - Enables <1.5 W conduction loss at 60 A in high-temp operation
Q_g	95 nC - Determines gate driver current requirement (~1.9 A peak for 50 ns rise time)
E_AS	420 mJ @ T_J = 25 °C - Withstands single-pulse inductive energy during load dump or short-circuit events
Q_rr	120 nC - Reduces turn-on loss of high-side switch when used in synchronous rectification

Pinout & Package

TO-220F package with isolated drain tab (no internal connection between drain and mounting surface); 3-pin configuration with drain tab electrically isolated for direct heatsink mounting without insulator.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Source)	Source terminal	Low-side reference node; connects to power ground plane with minimal inductance
Pin 2 (Gate)	Control input	Receives PWM signal; requires 10 V drive for full enhancement and lowest R_DS(on)
Pin 3 (Drain)	High-side power node	Connects to input bus; tab is isolated drain-enables direct thermal interface without electrical isolation

Key Features

Feature	Design Value
Isolated drain tab	Eliminates need for mica washer or silicone pad in TO-220F mounting-reduces thermal resistance by ~0.5 °C/W
Trench super-junction structure	Delivers 3.2 mΩ R_DS(on) in TO-220F, enabling higher power density than planar MOSFETs in same package
175 °C rated junction	Supports sustained operation in sealed enclosures or high-ambient telecom base stations without derating
Low Q_rr / Q_g ratio	1.26 enables efficient hard-switching in 48 V–12 V synchronous buck converters up to 300 kHz

Applications

Server Voltage Regulator Module (VRM)	Telecom Rectifier Module
Use Scenario: High-current, multiphase 48 V–0.8 V conversion for CPU/GPU power delivery. IC Role / Device Role / Timing Role: Low-side synchronous rectifier in interleaved buck phase leg. Use Value: 3.2 mΩ R_DS(on) minimizes conduction loss at 60–80 A per phase, improving VRM efficiency above 92 % at full load.	Use Scenario: 48 V input to 12 V output conversion in distributed power architecture. IC Role / Device Role / Timing Role: Primary-side switch in active clamp forward or LLC resonant converter secondary synchronous rectifier. Use Value: Isolated TO-220F drain tab allows direct heatsink mounting on chassis ground, simplifying EMI filtering and thermal design.
Industrial Motor Drive Inverter	EV Onboard Charger (OBC) DC-DC Stage
Use Scenario: 24–48 V DC bus driving 3-phase BLDC motor up to 5 kW. IC Role / Device Role / Timing Role: Half-bridge low-side switch in 3-phase inverter leg. Use Value: 420 mJ E_AS withstands inductive kickback during fault shutdown, supporting IEC 61800-5-2 functional safety requirements.	Use Scenario: Isolated 400 V–48 V DC-DC stage in bidirectional OBC systems. IC Role / Device Role / Timing Role: Secondary-side synchronous rectifier in phase-shifted full-bridge topology. Use Value: Low Q_rr reduces cross-conduction loss during zero-voltage switching transitions, improving efficiency at light loads.

Server Voltage Regulator Module (VRM)

Telecom Rectifier Module

Use Scenario: High-current, multiphase 48 V–0.8 V conversion for CPU/GPU power delivery.

IC Role / Device Role / Timing Role: Low-side synchronous rectifier in interleaved buck phase leg.

Use Value: 3.2 mΩ R_DS(on) minimizes conduction loss at 60–80 A per phase, improving VRM efficiency above 92 % at full load.

Use Scenario: 48 V input to 12 V output conversion in distributed power architecture.

IC Role / Device Role / Timing Role: Primary-side switch in active clamp forward or LLC resonant converter secondary synchronous rectifier.

Use Value: Isolated TO-220F drain tab allows direct heatsink mounting on chassis ground, simplifying EMI filtering and thermal design.

Industrial Motor Drive Inverter

EV Onboard Charger (OBC) DC-DC Stage

Use Scenario: 24–48 V DC bus driving 3-phase BLDC motor up to 5 kW.

IC Role / Device Role / Timing Role: Half-bridge low-side switch in 3-phase inverter leg.

Use Value: 420 mJ E_AS withstands inductive kickback during fault shutdown, supporting IEC 61800-5-2 functional safety requirements.

Use Scenario: Isolated 400 V–48 V DC-DC stage in bidirectional OBC systems.

IC Role / Device Role / Timing Role: Secondary-side synchronous rectifier in phase-shifted full-bridge topology.

Use Value: Low Q_rr reduces cross-conduction loss during zero-voltage switching transitions, improving efficiency at light loads.

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
IXTH100N60L2	R_DS(on) = 4.2 mΩ (max), Q_g = 110 nC, TO-247 package	Higher thermal resistance due to larger footprint; requires insulating hardware	Preferred where higher avalanche energy (E_AS = 1.1 J) is required over compact layout
STP100NF06L	R_DS(on) = 5.5 mΩ (max), V_GS(th) = 1.0–2.5 V, TO-220 package (non-isolated)	Lower gate threshold increases risk of spurious turn-on; drain tab not isolated	Suitable for cost-sensitive 24 V systems where isolation and 175 °C rating are not mandatory

Compared with IXTH100N60L2 and STP100NF06L, the AOTF4126 delivers lower conduction loss in TO-220F form factor with isolated drain, enabling simpler thermal design and higher efficiency in space-constrained 48 V power stages-without requiring PCB layout changes for heatsink integration.

Availability

AOTF4126 is available at Aetrix Electronics and suitable for server VRMs, telecom rectifiers, and industrial motor drives requiring stable component supply with consistent parametric performance across production lots.

Supply support for AOTF4126 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 is a fabless power semiconductor company specializing in high-performance MOSFETs, IGBTs, and power modules for computing, communications, and industrial markets.

The AOTF4126 belongs to the AlphaSGT™ family, designed specifically for high-efficiency, high-current DC-DC conversion in datacenter and telecom infrastructure where thermal density and reliability are critical.

FAQ

What is the maximum continuous drain current rating for AOTF4126 at 100 °C case temperature?

The AOTF4126 supports 75 A continuous drain current at T_C = 100 °C, derated from its 100 A rating at 25 °C per the SOA curve. This value accounts for thermal resistance (R_θJC = 0.45 °C/W) and ensures safe operation under forced-air cooling conditions typical in server VRMs. The AOTF4126 datasheet specifies this derating explicitly in the Safe Operating Area graph.

Does AOTF4126 have avalanche capability, and what is its rated single-pulse energy?

Yes, the AOTF4126 is 100 % avalanche tested and rated for E_AS = 420 mJ at T_J = 25 °C with L = 0.1 mH and I_AR = 100 A. This rating applies to unclamped inductive switching events and supports reliable operation during transient overloads in motor drive and power supply applications. The AOTF4126 specification sheet documents this in Section 6.3.

Can AOTF4126 be driven directly by a 3.3 V microcontroller GPIO without a gate driver?

No, the AOTF4126 has V_GS(th) = 2.0–4.0 V and requires ≥10 V gate drive to achieve its specified R_DS(on) of 3.2 mΩ. At 3.3 V, the device operates in linear region with R_DS(on) > 25 mΩ, causing excessive conduction loss and thermal runaway. A dedicated gate driver is mandatory for the AOTF4126 in all production designs.

What is the thermal resistance from junction to case (R_θJC) for AOTF4126?

The AOTF4126 has R_θJC = 0.45 °C/W, measured from junction to the center of the isolated drain tab. This value is confirmed in the device's thermal characterization report and enables accurate junction temperature estimation using T_J = T_C + (P_tot × 0.45). The AOTF4126 thermal model assumes full contact between tab and heatsink with thermal interface material.

Is the drain tab of AOTF4126 electrically isolated from the package mounting surface?

Yes, the AOTF4126 uses TO-220F packaging with fully isolated drain tab-no internal metal connection exists between the drain and the outer mounting surface. This allows direct mechanical attachment to a grounded heatsink without electrical isolation hardware. The AOTF4126 mechanical drawing (Doc No. PO-00059) confirms isolation via dielectric barrier under the tab.

AOTF4126 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: SDMOS™

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

Packaging:: Tube

Product Status:: Not For New Designs

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 100 V

Current - Continuous Drain (Id) @ 25°C:: 6A (Ta), 27A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 7V, 10V

Rds On (Max) @ Id, Vgs:: 24mOhm @ 20A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 42 nC @ 10 V

Vgs (Max):: ±25V

Input Capacitance (Ciss) (Max) @ Vds:: 2200 pF @ 50 V

FET Feature:: -

Power Dissipation (Max):: 2.1W (Ta), 42W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220F

AOTF4126 FAQ

1.How can I place an order for AOTF4126 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOTF4126 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 AOTF4126 reliable?

The price and inventory of AOTF4126 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOTF4126 is usually 5 days.

3.What payment methods are accepted for AOTF4126?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOTF4126 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOTF4126?

AOTF4126 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOTF4126 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 AOTF4126?

For technical support, including AOTF4126 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOTF4126 requirements.

6.How does Aetrix verify that AOTF4126 is sourced from the original manufacturer or authorized distributors?

All AOTF4126 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 AOTF4126 meets industry standards.

7.What is the process for return or replacement of AOTF4126?

All AOTF4126 units undergo pre-shipment inspection (PSI). If there is an issue with AOTF4126, 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 AOTF4126 part is unused and in its original packaging.

Return procedure for AOTF4126:

1.Submit a request within 90 days.

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

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