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

Alpha & Omega Semiconductor Inc. AOT2146L

Name: AOT2146L
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOT2146L
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOT2146L

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: AOT2146L.pdf

Description:: N

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Product details

Overview

AOT2146L from Alpha & Omega Semiconductor is a 40V, 105A N-channel Trench Power MOSFET using AlphaSGT™ technology, with R_DS(ON) < 2.8 mΩ at V_GS = 10 V and < 3.9 mΩ at V_GS = 4.5 V, optimized for high-efficiency DC motor drivers and synchronous rectification in DC/DC converters.

For engineers reviewing the AOT2146L datasheet, pinout, applications, or equivalent options, key selection criteria include its 100% UIS-tested ruggedness, low gate charge (Q_g = 50–70 nC at 10 V), TO-220 package thermal performance (R_θJC = 0.85 °C/W), and body-diode reverse recovery characteristics (t_rr = 18.5 ns, Q_rr = 50 nC).

Technical Context

The AOT2146L employs AlphaSGT™ trench-gate superjunction architecture to achieve ultra-low R_DS(ON) while maintaining robust avalanche capability (E_AS = 217 mJ) and 100% R_g-tested gate resistance (1–3 Ω). Its gate threshold voltage (1.5–2.5 V at 25°C) enables reliable 4.5 V logic-level drive compatibility.

Thermal design is supported by a junction-to-case thermal resistance of 0.85 °C/W and a maximum continuous drain current rating of 105 A at T_C = 25°C - limited by TO-220 package construction. The device features a fast body diode (t_rr = 18.5 ns, Q_rr = 50 nC) suitable for hard-switched synchronous rectification.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V - Maximum blocking voltage for 12–24 V system-level power stages
I_D (V_GS=10 V)	105 A - Continuous drain current at T_C = 25°C, package-limited
R_DS(ON) (V_GS=10 V)	< 2.8 mΩ - Enables ≤ 3 W conduction loss at 100 A, critical for high-current motor drives
Q_g (10 V)	50–70 nC - Low gate charge reduces switching losses and driver power requirements
t_rr / Q_rr	18.5 ns / 50 nC - Fast body-diode recovery minimizes shoot-through risk and EMI in synchronous buck topologies
R_θJC	0.85 °C/W - Enables high-power operation with minimal heatsink mass when mounted to copper plane
E_AS	217 mJ - 100% unclamped inductive switching tested, supports robust fault handling in motor control

Pinout & Package

Package: TO-220 (3-lead, through-hole, vertical mounting). Thermal pad on drain-connected tab; leads are G (Gate), D (Drain), S (Source) in standard top-view orientation.

Pin/Terminal	Circuit Role	Design Meaning
Lead 1 (left)	Gate (G)	Control terminal; low input capacitance (C_iss = 3830 pF) eases gate driver sizing
Lead 2 (center)	Drain (D)	Main power output path; electrically connected to metal tab for thermal and electrical conduction
Lead 3 (right)	Source (S)	Power return reference; ties to PCB ground plane and provides low-inductance source loop

Key Features

Feature	Design Value
AlphaSGT™ trench technology	Delivers sub-3 mΩ R_DS(ON) at 40 V while maintaining high dV/dt immunity and avalanche reliability
100% UIS tested	Guarantees minimum 217 mJ single-pulse avalanche energy without derating, critical for motor stall protection
Low Q_g/Q_gd ratio	Q_gd = 3 nC vs. Q_g = 50–70 nC ensures Miller immunity and clean hard-switching transitions
RoHS & halogen-free	Complies with IPC-1752A material declaration requirements for industrial and automotive supply chains
Optimized body diode	t_rr = 18.5 ns with soft recovery reduces voltage overshoot and EMI in synchronous rectifier applications

Applications

DC Motor Driver	Synchronous Rectifier
Use Scenario: High-current brushed DC motor control in industrial actuators and power tools operating from 24 V bus. IC Role / Device Role / Timing Role: Main power switch in H-bridge leg, conducting up to 105 A continuously with minimal I²R loss. Use Value: Sub-2.8 mΩ R_DS(ON) limits conduction loss to under 11 W at 100 A, reducing heatsink size and improving system efficiency.	Use Scenario: Secondary-side synchronous rectification in isolated 48 V–12 V DC/DC converters for telecom and server PSUs. IC Role / Device Role / Timing Role: Low-side switch replacing Schottky diode, driven by controller with precise dead-time control. Use Value: 3.9 mΩ R_DS(ON) at 4.5 V gate drive enables >95% efficiency at full load, outperforming 40 V Schottky alternatives.
Power OR-ing Circuit	Hot-Swap Controller FET
Use Scenario: Redundant 12 V power rail OR-ing in network switches and storage enclosures. IC Role / Device Role / Timing Role: Back-to-back configured N-channel MOSFET providing low-loss bidirectional current path with reverse polarity protection. Use Value: Low R_DS(ON) and fast t_rr minimize forward voltage drop (< 40 mV at 50 A) and prevent cross-conduction during rail switchover.	Use Scenario: Inrush current limiting and fault isolation in 24 V industrial backplane hot-swap modules. IC Role / Device Role / Timing Role: Main pass FET controlled by dedicated hot-swap IC to manage slew rate and overcurrent shutdown. Use Value: 100% UIS-rated ruggedness withstands repeated short-circuit events during insertion, extending board lifecycle.

DC Motor Driver

Synchronous Rectifier

Use Scenario: High-current brushed DC motor control in industrial actuators and power tools operating from 24 V bus.

IC Role / Device Role / Timing Role: Main power switch in H-bridge leg, conducting up to 105 A continuously with minimal I²R loss.

Use Value: Sub-2.8 mΩ R_DS(ON) limits conduction loss to under 11 W at 100 A, reducing heatsink size and improving system efficiency.

Use Scenario: Secondary-side synchronous rectification in isolated 48 V–12 V DC/DC converters for telecom and server PSUs.

IC Role / Device Role / Timing Role: Low-side switch replacing Schottky diode, driven by controller with precise dead-time control.

Use Value: 3.9 mΩ R_DS(ON) at 4.5 V gate drive enables >95% efficiency at full load, outperforming 40 V Schottky alternatives.

Power OR-ing Circuit

Hot-Swap Controller FET

Use Scenario: Redundant 12 V power rail OR-ing in network switches and storage enclosures.

IC Role / Device Role / Timing Role: Back-to-back configured N-channel MOSFET providing low-loss bidirectional current path with reverse polarity protection.

Use Value: Low R_DS(ON) and fast t_rr minimize forward voltage drop (< 40 mV at 50 A) and prevent cross-conduction during rail switchover.

Use Scenario: Inrush current limiting and fault isolation in 24 V industrial backplane hot-swap modules.

IC Role / Device Role / Timing Role: Main pass FET controlled by dedicated hot-swap IC to manage slew rate and overcurrent shutdown.

Use Value: 100% UIS-rated ruggedness withstands repeated short-circuit events during insertion, extending board lifecycle.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel power 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	Higher conduction and switching losses limit use to lower-frequency, lower-current motor drives	Choose when legacy design reuse or cost sensitivity outweighs efficiency targets
STP110N4F6	R_DS(ON) = 3.2 mΩ @ 10 V; no 100% UIS test data published; similar Q_g (65 nC)	Lacks documented avalanche ruggedness validation, unsuitable for unclamped inductive loads	Prefer only in non-inductive, well-clamped applications where avalanche stress is absent

Compared with IRF1404PbF and STP110N4F6, the AOT2146L delivers superior conduction efficiency (2.8 mΩ vs. ≥3.2 mΩ), lower gate drive demand (50–70 nC vs. ≥65 nC), and guaranteed avalanche ruggedness - making it optimal for high-reliability 24–48 V motor and power conversion systems.

Availability

AOT2146L is available at Aetrix Electronics and suitable for DC motor drivers, synchronous rectifiers in DC/DC converters, and hot-swap controllers requiring stable component supply across industrial OEM production cycles.

Supply support for AOT2146L 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, industrial, and communications markets.

The AOT2146L belongs to AOS's AlphaSGT™ Trench Power MOSFET product line, engineered specifically for high-current, high-efficiency switching in 12–48 V power systems where low R_DS(ON), ruggedness, and fast body-diode recovery are essential.

FAQ

What is the maximum continuous drain current rating for the AOT2146L?

The AOT2146L has a maximum continuous drain current (I_D) of 105 A at case temperature T_C = 25°C, as specified in the Absolute Maximum Ratings table. This rating is package-limited by the TO-220 construction and decreases to 38 A at T_C = 100°C per the derating curve in the datasheet. The AOT2146L must be mounted to an adequate heatsink to sustain high-current operation.

Does the AOT2146L support 4.5 V logic-level gate drive?

Yes, the AOT2146L is fully compatible with 4.5 V logic-level gate drive, delivering R_DS(ON) < 3.9 mΩ under those conditions. Its gate threshold voltage range (1.5–2.5 V at 25°C) ensures strong turn-on margin, and its low Q_g (20–30 nC at 4.5 V) minimizes driver loading. The AOT2146L is widely used in 5 V microcontroller-driven motor control designs.

Is the AOT2146L rated for avalanche energy, and what is the value?

Yes, the AOT2146L is 100% unclamped inductive switching (UIS) tested, with a guaranteed single-pulse avalanche energy (E_AS) of 217 mJ at T_J = 25°C. This rating is validated per JEDEC JESD24-11 and supports robust operation in motor drive fault conditions. The AOT2146L's ruggedness makes it suitable for applications where inductive load interruption is possible.

What is the thermal resistance from junction to case (R_θJC) for the AOT2146L?

The AOT2146L has a typical junction-to-case thermal resistance (R_θJC) of 0.85 °C/W, measured with the device mounted to a large heatsink. This low value reflects efficient heat transfer from the silicon die to the TO-220 metal tab. When designing thermal management, this R_θJC value must be combined with heatsink thermal resistance to calculate total junction temperature rise. The AOT2146L's R_θJC enables high-power operation with compact thermal solutions.

How does the body diode performance of the AOT2146L compare to standard MOSFETs?

The AOT2146L features an optimized body diode with t_rr = 18.5 ns and Q_rr = 50 nC at I_F = 20 A and di/dt = 500 A/µs - significantly faster than standard planar MOSFETs. This enables clean commutation in synchronous rectification and reduces voltage spikes and EMI. The AOT2146L's body diode is characterized across temperature and supports hard-switched topologies without external Schottky supplementation.

AOT2146L Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: AlphaSGT™

Package/Case:: TO-220-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 40 V

Current - Continuous Drain (Id) @ 25°C:: 42A (Ta), 105A (Tc)

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

Rds On (Max) @ Id, Vgs:: 2.8mOhm @ 20A, 10V

Vgs(th) (Max) @ Id:: 2.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 70 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 3830 pF @ 20 V

FET Feature:: -

Power Dissipation (Max):: 8.3W (Ta), 119W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

AOT2146L FAQ

1.How can I place an order for AOT2146L through Aetrix?

Please submit a Request for Quotation (RFQ) for AOT2146L 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 AOT2146L reliable?

The price and inventory of AOT2146L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOT2146L is usually 5 days.

3.What payment methods are accepted for AOT2146L?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOT2146L transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOT2146L?

AOT2146L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOT2146L 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 AOT2146L?

For technical support, including AOT2146L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOT2146L requirements.

6.How does Aetrix verify that AOT2146L is sourced from the original manufacturer or authorized distributors?

All AOT2146L 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 AOT2146L meets industry standards.

7.What is the process for return or replacement of AOT2146L?

All AOT2146L units undergo pre-shipment inspection (PSI). If there is an issue with AOT2146L, 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 AOT2146L part is unused and in its original packaging.

Return procedure for AOT2146L:

1.Submit a request within 90 days.

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

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