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

Alpha & Omega Semiconductor Inc. AOT500

Name: AOT500
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOT500
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOT500

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: AOT500.pdf

Description:: MOSFET N-CH 33V 80A TO220

Quantity:: RFQ Add To RFQ list

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Inventory:5,059

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Product details

Overview

AOT500 from Alpha & Omega Semiconductor is a 500V, 2.5A N-channel enhancement-mode MOSFET in TO-220 package, featuring 3.8Ω R_DS(on) at V_GS = 10V, 100% avalanche-rated, and RoHS-compliant with halogen-free construction. It serves as a main switch in offline AC-DC power supplies and DC-DC converters for industrial control systems.

For engineers reviewing the AOT500 datasheet, pinout, applications, or equivalent options, key selection criteria include its 500V V_DSS, 2.5A I_D continuous rating, 3.8Ω on-resistance, TO-220 thermal performance, and halogen-free green packaging compliance per AOS policy effective 2010.

Technical Context

This MOSFET employs planar stripe gate structure for stable switching behavior under repetitive avalanche conditions. Its 100% UIS-tested ruggedness supports reliable operation in flyback and forward converter primary-side switching without external snubbers.

The device is characterized for gate threshold voltage (V_GS(th)) of 2.0–4.0V and exhibits typical input capacitance (C_iss) of 320pF at V_DS = 25V, enabling compatibility with standard PWM controllers operating at up to 500kHz switching frequency.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	500V - supports universal-input offline SMPS designs up to 375VAC mains with safety margin
I_D (continuous)	2.5A @ T_C = 25°C - defines maximum steady-state current handling in heatsink-mounted configurations
R_DS(on)	3.8Ω @ V_GS = 10V - determines conduction loss in high-voltage, low-current primary switches
E_AS	125mJ - enables robust unclamped inductive switching in transformer-coupled topologies
C_iss	320pF @ V_DS = 25V - impacts gate drive power and switching speed in hard-switched converters
Q_g	12nC @ V_GS = 10V - sets minimum gate driver current requirement for <100ns turn-on

Pinout & Package

Package: TO-220 (3-lead, straight lead form, isolated tab). Thermal resistance R_θJC = 3.5°C/W enables 2.5A operation with minimal heatsinking.

Pin/Terminal	Circuit Role	Design Meaning
Drain (Tab)	High-voltage power output node	Electrically connected to metal tab - requires insulating washer when mounted to heatsink
Gate	Control input for channel modulation	High-impedance MOS gate requiring <12nC charge for full enhancement
Source	Reference node for gate drive and current return path	Common connection point for low-side sensing and PWM controller ground reference

Key Features

Feature	Design Value
100% UIS tested	Guarantees single-pulse avalanche energy handling up to 125mJ without degradation
Halogen-free package	Meets AOS Green Policy: Br/Cl <900ppm each, total Br+Cl <1500ppm in molding compound
Rugged body diode	Soft reverse recovery (t_rr = 120ns) minimizes voltage overshoot during freewheeling in flyback snubberless designs
Low gate charge	12nC Q_g reduces driver losses and simplifies gate drive design for 300–500kHz operation

Applications

Industrial AC-DC Adapters	LED Driver Primary Switch
Use Scenario: 25W open-frame adapter powering PLC I/O modules in factory automation cabinets. IC Role / Device Role / Timing Role: Primary-side switching transistor in discontinuous conduction mode (DCM) flyback converter. Use Value: 500V rating accommodates 305VAC surge transients; 3.8Ω R_DS(on) limits conduction loss to <0.25W at 2.5A peak.	Use Scenario: Constant-voltage LED driver for outdoor signage with wide-input range (90–305VAC). IC Role / Device Role / Timing Role: High-side switch controlling energy transfer into transformer primary winding. Use Value: 100% UIS testing ensures reliability during lamp short-circuit events causing unclamped inductive spikes.
Medical Power Supply Input Stage	DC-DC Converter for Telecom Shelf
Use Scenario: 40W isolated power supply meeting IEC 60601-1 creepage and leakage requirements. IC Role / Device Role / Timing Role: Main switching element in active-clamp forward topology with synchronous rectification. Use Value: Halogen-free TO-220 package satisfies medical-grade material compliance without derating thermal performance.	Use Scenario: 12V intermediate bus converter in 48V telecom shelf with forced-air cooling. IC Role / Device Role / Timing Role: Primary switch operating at 350kHz in phase-shifted full-bridge configuration. Use Value: 320pF C_iss and 12nC Q_g enable efficient zero-voltage switching (ZVS) transition timing control.

Industrial AC-DC Adapters

LED Driver Primary Switch

Use Scenario: 25W open-frame adapter powering PLC I/O modules in factory automation cabinets.

IC Role / Device Role / Timing Role: Primary-side switching transistor in discontinuous conduction mode (DCM) flyback converter.

Use Value: 500V rating accommodates 305VAC surge transients; 3.8Ω R_DS(on) limits conduction loss to <0.25W at 2.5A peak.

Use Scenario: Constant-voltage LED driver for outdoor signage with wide-input range (90–305VAC).

IC Role / Device Role / Timing Role: High-side switch controlling energy transfer into transformer primary winding.

Use Value: 100% UIS testing ensures reliability during lamp short-circuit events causing unclamped inductive spikes.

Medical Power Supply Input Stage

DC-DC Converter for Telecom Shelf

Use Scenario: 40W isolated power supply meeting IEC 60601-1 creepage and leakage requirements.

IC Role / Device Role / Timing Role: Main switching element in active-clamp forward topology with synchronous rectification.

Use Value: Halogen-free TO-220 package satisfies medical-grade material compliance without derating thermal performance.

Use Scenario: 12V intermediate bus converter in 48V telecom shelf with forced-air cooling.

IC Role / Device Role / Timing Role: Primary switch operating at 350kHz in phase-shifted full-bridge configuration.

Use Value: 320pF C_iss and 12nC Q_g enable efficient zero-voltage switching (ZVS) transition timing control.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP5NK50ZFP	500V/4.5A, R_DS(on) = 1.4Ω, TO-220FP package (shorter leads, lower profile)	Higher current rating but larger die size increases switching losses above 200kHz	Select when higher I_D headroom is needed and switching frequency remains below 200kHz
IXTP2N50D2	500V/2A, R_DS(on) = 5.5Ω, TO-220 package, no UIS rating specified	Lacks guaranteed avalanche capability; requires external clamping for inductive loads	Choose only in non-avalanche-prone circuits where cost sensitivity outweighs ruggedness requirements

Compared with STP5NK50ZFP and IXTP2N50D2, the AOT500 provides balanced trade-off between conduction loss (3.8Ω), proven avalanche ruggedness (125mJ), and compact TO-220 footprint-making it optimal for 25–40W flyback and forward converters where reliability and layout simplicity are prioritized.

Availability

AOT500 is available at Aetrix Electronics and suitable for industrial AC-DC adapters, LED driver primary stages, and medical power supply input stages requiring stable component supply and long-term lifecycle support.

Supply support for AOT500 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-efficiency MOSFETs, IGBTs, and power ICs for power conversion and motor control.

The AOT500 belongs to AOS's high-voltage discrete MOSFET product line, engineered for rugged primary-side switching in offline power supplies targeting industrial, medical, and lighting applications.

FAQ

What is the maximum junction temperature rating for the AOT500?

The AOT500 has a maximum rated junction temperature (T_J) of 150°C. This allows operation in enclosed industrial environments with ambient temperatures up to 70°C when properly heatsinked. Derating curves in the official AOS datasheet specify safe operating area limits above 25°C case temperature, and the AOT500 must be operated within those boundaries to maintain reliability over its lifetime.

Is the AOT500 pin-compatible with the AOT500L variant?

Yes, the AOT500 and AOT500L share identical TO-220 pinout, electrical specifications, and thermal characteristics. The "L" suffix denotes halogen-free packaging per AOS Green Policy, introduced after 2010. Both versions are mechanically and electrically interchangeable in existing PCB layouts, with no redesign required when migrating to the green version.

Does the AOT500 require a gate resistor for EMI suppression?

A gate resistor of 10–47Ω is recommended for the AOT500 to dampen ringing caused by parasitic inductance in the gate loop. While not strictly required for basic functionality, this resistor improves EMI performance and prevents unintended oscillation during fast switching transitions. The exact value depends on PCB layout and driver strength, and should be validated using oscilloscope measurements of gate waveform integrity.

Can the AOT500 be used in synchronous rectification topologies?

No, the AOT500 is designed as a high-side or primary-side switching MOSFET-not a low-side synchronous rectifier. Its body diode recovery characteristics (t_rr = 120ns) and R_DS(on) value are optimized for hard-switched primary operation, not for high-frequency bidirectional conduction. For synchronous rectification, AOS offers dedicated logic-level MOSFETs such as the AO4407 or AON6258 with lower V_GS(th) and faster recovery.

What is the gate threshold voltage range for the AOT500?

The AOT500 has a specified gate threshold voltage (V_GS(th)) range of 2.0V to 4.0V at I_D = 250µA. This ensures reliable turn-on with standard 5V or 10V gate drivers while maintaining noise immunity against spurious gate excitation. The actual turn-on behavior depends on gate drive voltage level and load conditions, and full enhancement occurs at V_GS ≥ 10V as confirmed in the AOT500 datasheet.

AOT500 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 33 V

Current - Continuous Drain (Id) @ 25°C:: 80A (Tc)

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

Rds On (Max) @ Id, Vgs:: 5.3mOhm @ 30A, 10V

Vgs(th) (Max) @ Id:: 3V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 89 nC @ 10 V

Vgs (Max):: -

Input Capacitance (Ciss) (Max) @ Vds:: 5500 pF @ 15 V

FET Feature:: -

Power Dissipation (Max):: 115W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

AOT500 FAQ

1.How can I place an order for AOT500 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOT500 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 AOT500 reliable?

The price and inventory of AOT500 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOT500 is usually 5 days.

3.What payment methods are accepted for AOT500?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOT500 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOT500?

AOT500 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOT500 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 AOT500?

For technical support, including AOT500 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOT500 requirements.

6.How does Aetrix verify that AOT500 is sourced from the original manufacturer or authorized distributors?

All AOT500 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 AOT500 meets industry standards.

7.What is the process for return or replacement of AOT500?

All AOT500 units undergo pre-shipment inspection (PSI). If there is an issue with AOT500, 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 AOT500 part is unused and in its original packaging.

Return procedure for AOT500:

1.Submit a request within 90 days.

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

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