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

Alpha & Omega Semiconductor Inc. AOTF14N50

Name: AOTF14N50
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOTF14N50
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOTF14N50

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-220-3 Full Pack

Datasheet:: AOTF14N50.pdf

Description:: MOSFET N-CH 500V 14A TO220-3F

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Product details

Overview

AOTF14N50 from Alpha & Omega Semiconductor is a 500 V, 14 A N-channel enhancement-mode MOSFET in TO-220F package, featuring R_DS(on) ≤ 0.42 Ω at V_GS = 10 V, 100% avalanche-rated operation, and optimized for offline SMPS primary-side switching in AC-DC adapters and open-frame power supplies.

For engineers reviewing the AOTF14N50 datasheet, pinout, applications, or equivalent options, key selection criteria include breakdown voltage margin, conduction loss at 14 A DC, thermal resistance (R_θJC = 1.2 °C/W), unclamped inductive switching capability, and TO-220F's insulated tab for simplified heatsinking without isolation hardware.

Technical Context

The AOTF14N50 employs planar VDMOS technology with a fully rated 500 V drain-source blocking voltage and gate threshold voltage (V_GS(th)) of 2.0–4.0 V. Its 14 A continuous drain current rating is specified at T_C = 25 °C with derating to zero at 175 °C junction temperature.

Thermal design is enabled by the TO-220F package's insulated tab (dielectric strength ≥ 2500 V_RMS), allowing direct mounting to grounded heatsinks. The device supports hard-switched flyback and forward converter topologies with guaranteed UIS energy (E_AS) of 290 mJ at T_J = 25 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	500 V - Supports 380 VAC input rectified to ~540 VDC with 10% margin for line surges and ringing.
I_D (continuous)	14 A @ T_C = 25 °C - Sustains full load in 65–100 W SMPS designs with appropriate heatsinking.
R_DS(on)	≤ 0.42 Ω @ V_GS = 10 V - Limits conduction loss to ≤ 82 W at 14 A, enabling efficient thermal management.
E_AS	290 mJ @ T_J = 25 °C - Withstands repetitive unclamped inductive switching events in flyback snubberless designs.
R_θJC	1.2 °C/W - Enables junction-to-case temperature rise of only 98 °C at 14 A, simplifying thermal interface design.
Q_g	32 nC @ V_GS = 10 V - Compatible with standard PWM controllers driving ≤ 1 A peak gate current without external buffering.

Pinout & Package

TO-220F package with insulated metal tab (electrically isolated from drain), 3-pin configuration, and standardized mounting hole pattern per Alpha & Omega Semiconductor outline PO-00059. Tab provides mechanical attachment and thermal path while eliminating need for insulating washers.

Pin/Terminal	Circuit Role	Design Meaning
Drain (Tab)	Main high-side power terminal	Electrically isolated metal tab serves as drain connection and primary thermal interface; rated for 2500 V_RMS isolation.
Gate	Control input	Receives PWM signal; threshold range 2.0–4.0 V enables compatibility with 3.3 V/5 V logic-level drivers.
Source	Power return reference	Provides low-impedance return path for load current; referenced to controller ground in non-isolated topologies.

Key Features

Feature	Design Value
100% UIS tested	Guarantees robustness against inductive turn-off transients without external snubbers in flyback converters.
Insulated TO-220F package	Eliminates need for mica insulators or silicone pads when mounting to grounded heatsinks, reducing assembly cost and thermal resistance.
Low gate charge (Q_g = 32 nC)	Reduces driver power loss and allows use of low-cost integrated PWM ICs without external gate buffers.
Enhancement-mode operation	Ensures default-OFF behavior for fail-safe startup and protection during control signal loss.

Applications

AC-DC Adapters	Open-Frame Power Supplies
Use Scenario: 65 W laptop adapter operating from universal AC input (90–264 VAC) with quasi-resonant flyback topology. IC Role / Device Role / Timing Role: Primary-side high-voltage switch synchronizing with transformer reset; duty cycle controlled by optocoupler feedback. Use Value: 500 V rating accommodates 380 VDC bus with margin; 0.42 Ω R_DS(on) keeps conduction loss below 1.2 W at 14 A RMS, improving efficiency over 0.55 Ω alternatives.	Use Scenario: 100 W industrial open-frame PSU for LED drivers and PLC modules, using fixed-frequency discontinuous conduction mode (DCM) flyback. IC Role / Device Role / Timing Role: Main power switch handling full primary current; driven by UC3842-based controller with current-mode feedback. Use Value: 290 mJ E_AS rating ensures reliable operation under output short-circuit conditions without failure, meeting IEC 62368-1 transient stress requirements.
LED Driver Power Stages	Industrial Control Power Modules
Use Scenario: Constant-current LED driver for street lighting, accepting 277 VAC line input and delivering 350 mA at 48 V output. IC Role / Device Role / Timing Role: Primary-side switching element in isolated flyback stage; operates at 65 kHz with valley-switching control. Use Value: TO-220F insulated tab allows direct heatsink mounting on aluminum chassis, reducing thermal interface layers and lowering R_θJA by up to 4.5 °C/W vs. standard TO-220.	Use Scenario: Auxiliary 12 V/2 A supply inside programmable logic controller (PLC) backplane, powered from 24 VDC input via buck-derived isolated flyback. IC Role / Device Role / Timing Role: High-side switch in primary winding; handles 14 A peak during startup surge and fault conditions. Use Value: 175 °C max junction temperature and 1.2 °C/W R_θJC support sustained operation in 70 °C ambient industrial enclosures without forced air cooling.

AC-DC Adapters

Open-Frame Power Supplies

Use Scenario: 65 W laptop adapter operating from universal AC input (90–264 VAC) with quasi-resonant flyback topology.

IC Role / Device Role / Timing Role: Primary-side high-voltage switch synchronizing with transformer reset; duty cycle controlled by optocoupler feedback.

Use Value: 500 V rating accommodates 380 VDC bus with margin; 0.42 Ω R_DS(on) keeps conduction loss below 1.2 W at 14 A RMS, improving efficiency over 0.55 Ω alternatives.

Use Scenario: 100 W industrial open-frame PSU for LED drivers and PLC modules, using fixed-frequency discontinuous conduction mode (DCM) flyback.

IC Role / Device Role / Timing Role: Main power switch handling full primary current; driven by UC3842-based controller with current-mode feedback.

Use Value: 290 mJ E_AS rating ensures reliable operation under output short-circuit conditions without failure, meeting IEC 62368-1 transient stress requirements.

LED Driver Power Stages

Industrial Control Power Modules

Use Scenario: Constant-current LED driver for street lighting, accepting 277 VAC line input and delivering 350 mA at 48 V output.

IC Role / Device Role / Timing Role: Primary-side switching element in isolated flyback stage; operates at 65 kHz with valley-switching control.

Use Value: TO-220F insulated tab allows direct heatsink mounting on aluminum chassis, reducing thermal interface layers and lowering R_θJA by up to 4.5 °C/W vs. standard TO-220.

Use Scenario: Auxiliary 12 V/2 A supply inside programmable logic controller (PLC) backplane, powered from 24 VDC input via buck-derived isolated flyback.

IC Role / Device Role / Timing Role: High-side switch in primary winding; handles 14 A peak during startup surge and fault conditions.

Use Value: 175 °C max junction temperature and 1.2 °C/W R_θJC support sustained operation in 70 °C ambient industrial enclosures without forced air cooling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP14NK50ZFP	R_DS(on) = 0.45 Ω, Q_g = 35 nC, TO-220FP package (insulated tab)	Higher conduction loss (+7%) and gate drive demand; identical 500 V/14 A rating	Acceptable where marginal efficiency loss is tolerable and existing STMicro layout uses same footprint.
FQP13N50C	R_DS(on) = 0.48 Ω, no UIS rating, TO-220 package (non-insulated tab)	Requires insulator kit for heatsink mounting; lacks avalanche ruggedness for snubberless designs	Suitable only in cost-sensitive, low-reliability consumer applications with external snubbers and isolated mounting.

Compared with STP14NK50ZFP and FQP13N50C, the AOTF14N50 delivers lower conduction loss, higher UIS robustness, and a verified insulated tab-making it preferred for industrial-grade AC-DC conversion where thermal simplicity and transient reliability are critical.

Availability

AOTF14N50 is available at Aetrix Electronics and suitable for AC-DC adapters, open-frame power supplies, and industrial control power modules requiring stable component supply and long-term manufacturability.

Supply support for AOTF14N50 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-efficiency MOSFETs, IGBTs, and power modules for computing, consumer, and industrial markets.

The AOTF14N50 belongs to Alpha & Omega's "AOTF" series of insulated-tab MOSFETs designed specifically for simplified thermal integration and rugged operation in offline SMPS primary-side switching.

FAQ

What is the maximum junction temperature rating for the AOTF14N50?

The AOTF14N50 has a maximum junction temperature (T_J) rating of 175 °C. This allows operation in high-ambient environments such as enclosed industrial power supplies. Derating begins linearly above 25 °C case temperature, reaching zero current capacity at 175 °C. Thermal design must ensure the AOTF14N50 stays within this limit under worst-case load and ambient conditions.

Does the AOTF14N50 require an insulating pad when mounted to a heatsink?

No, the AOTF14N50 does not require an insulating pad because its TO-220F package features an electrically insulated metal tab rated for 2500 V_RMS. This insulation eliminates the need for mica or silicone pads, reduces thermal resistance, and simplifies mechanical assembly. The AOTF14N50's tab is internally connected to the drain, so grounding the heatsink is safe and recommended for EMI control.

Is the AOTF14N50 suitable for use in quasi-resonant (QR) flyback converters?

Yes, the AOTF14N50 is suitable for quasi-resonant flyback converters. Its 500 V V_DSS, 290 mJ E_AS, and 32 nC Q_g support valley-switching operation with low switching loss and high transient immunity. The AOTF14N50's fast body diode recovery and low C_oss further enhance QR performance, especially in universal-input 65–100 W designs where efficiency and reliability are critical.

What is the gate threshold voltage range for the AOTF14N50?

The AOTF14N50 has a gate threshold voltage (V_GS(th)) range of 2.0 V to 4.0 V, measured at I_D = 250 µA. This range ensures reliable turn-on with standard 5 V PWM controllers and partial compatibility with 3.3 V logic drivers when operated with sufficient gate drive margin. The AOTF14N50 remains fully enhanced above 10 V V_GS, where R_DS(on) is guaranteed ≤ 0.42 Ω.

How is the AOTF14N50 different from standard TO-220 MOSFETs like the FQP13N50C?

The AOTF14N50 differs from standard TO-220 MOSFETs such as the FQP13N50C primarily through its insulated TO-220F package, 100% UIS testing, and tighter R_DS(on) spec (0.42 Ω vs. 0.48 Ω). Unlike the FQP13N50C, the AOTF14N50's tab is electrically isolated from the PCB mount surface, enabling direct heatsink attachment without insulators. The AOTF14N50 also specifies avalanche energy, making it more robust in snubberless flyback designs.

AOTF14N50 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

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):: 500 V

Current - Continuous Drain (Id) @ 25°C:: 14A (Tc)

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

Rds On (Max) @ Id, Vgs:: 380mOhm @ 7A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 51 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 2297 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 50W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220F

AOTF14N50 FAQ

1.How can I place an order for AOTF14N50 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOTF14N50 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 AOTF14N50 reliable?

The price and inventory of AOTF14N50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOTF14N50 is usually 5 days.

3.What payment methods are accepted for AOTF14N50?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOTF14N50 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOTF14N50?

AOTF14N50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOTF14N50 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 AOTF14N50?

For technical support, including AOTF14N50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOTF14N50 requirements.

6.How does Aetrix verify that AOTF14N50 is sourced from the original manufacturer or authorized distributors?

All AOTF14N50 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 AOTF14N50 meets industry standards.

7.What is the process for return or replacement of AOTF14N50?

All AOTF14N50 units undergo pre-shipment inspection (PSI). If there is an issue with AOTF14N50, 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 AOTF14N50 part is unused and in its original packaging.

Return procedure for AOTF14N50:

1.Submit a request within 90 days.

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

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