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

Alpha & Omega Semiconductor Inc. AOTF8N65

Name: AOTF8N65
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOTF8N65
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOTF8N65

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-220-3 Full Pack

Datasheet:: AOTF8N65.pdf

Description:: MOSFET N-CH 650V 8A TO220-3F

Quantity:: RFQ Add To RFQ list

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Inventory:4,723

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Product details

Overview

AOTF8N65 from Alpha & Omega Semiconductor is a 650 V, 8 A N-channel enhancement-mode high-voltage power MOSFET in TO-220F package, designed for offline AC-DC power supplies, LED drivers, and industrial motor control where high breakdown voltage and low conduction loss are required.

For engineers reviewing the AOTF8N65 datasheet, pinout, applications, or equivalent options, key selection criteria include R_DS(on) at 10 V gate drive, avalanche ruggedness rating, thermal resistance (R_θJC), and TO-220F package's insulated tab for simplified heatsinking without isolation hardware.

Technical Context

The AOTF8N65 employs planar stripe silicon process with optimized cell pitch to achieve balanced switching speed and conduction efficiency. It features 100% UIS-tested avalanche capability and specified gate charge (Q_g) of 34 nC at V_GS = 10 V, enabling predictable turn-on/turn-off timing in hard-switched flyback and PFC stages.

Its TO-220F package integrates an electrically isolated metal tab (rated to 2500 V_RMS dielectric strength), eliminating need for insulating pads in grounded-heatsink configurations. Maximum junction temperature is rated at 150 °C with continuous drain current limited by package thermal constraints.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	650 V - Withstands peak line voltages up to 400 VAC input after rectification with margin for transients.
I_D (continuous)	8 A @ T_C = 25 °C - Supports medium-power SMPS designs up to ~150 W output with proper heatsinking.
R_DS(on) max	0.85 Ω @ V_GS = 10 V - Enables <1.5 W conduction loss at 4 A RMS drain current in typical LED driver operation.
Q_g	34 nC - Determines gate driver current requirement (~17 mA average for 2 MHz switching at 10 V swing).
E_AS	320 mJ - Confirmed single-pulse avalanche energy rating supports robustness against inductive switching stress.
R_θJC	1.5 °C/W - Enables direct thermal path from die to heatsink via insulated tab, critical for compact industrial enclosures.

Pinout & Package

TO-220F package with electrically insulated metal tab (dielectric strength ≥2500 V_RMS), standard 3-pin configuration, and footprint compatible with industry-standard TO-220 mounting holes per recommended pattern (ØP = 3.18 mm, E = 10.16 mm, D = 15.87 mm).

Pin/Terminal	Circuit Role	Design Meaning
Drain (Tab)	High-side power switch node	Electrically isolated tab connects directly to drain; enables heatsink mounting without additional insulation hardware.
Gate	Control input	Threshold voltage V_GS(th) = 3–5 V; requires 10 V drive for full R_DS(on) specification and optimal switching performance.
Source	Reference return path	Low-impedance source connection; must be routed with minimal inductance to avoid gate oscillation during fast switching.

Key Features

Feature	Design Value
100% UIS tested	Guarantees single-pulse avalanche energy handling up to 320 mJ, reducing need for external snubbers in flyback transformer reset.
Insulated TO-220F tab	Eliminates thermal pad and insulator hardware in grounded heatsink layouts, lowering BOM cost and assembly steps.
Low gate charge	34 nC Q_g reduces driver power consumption and simplifies gate drive design in high-frequency PFC circuits.
Enhancement-mode operation	Normally-off behavior ensures safe default state during startup, brownout, or controller fault conditions.

Applications

LED Constant-Current Driver	Offline Flyback SMPS
Use Scenario: High-efficiency constant-current driver for commercial LED streetlights operating from 90–305 VAC input. IC Role / Device Role / Timing Role: Primary-side high-side switch regulating output current via primary-sense feedback. Use Value: 650 V rating accommodates universal input with margin; 0.85 Ω R_DS(on) limits conduction loss to <1.2 W at 3.5 A LED string current.	Use Scenario: 65 W open-frame adapter for industrial control panels requiring reinforced isolation and long-term reliability. IC Role / Device Role / Timing Role: Main power switch in discontinuous conduction mode (DCM) flyback converter. Use Value: 320 mJ E_AS withstands transformer leakage energy without clamping diode, simplifying secondary-side design.
PFC Boost Converter	Brushless DC Motor Control
Use Scenario: Active front-end boost PFC stage in HVAC blower modules targeting >0.95 PF and <10% THD. IC Role / Device Role / Timing Role: Switching element in continuous conduction mode (CCM) boost topology. Use Value: Low Q_g (34 nC) enables efficient 65 kHz switching with minimal gate drive loss and reduced EMI filter size.	Use Scenario: Half-bridge high-side switch in 24 V BLDC motor driver for automated gate operators. IC Role / Device Role / Timing Role: High-side power switch controlled via isolated gate driver in three-phase inverter leg. Use Value: Insulated tab allows direct mounting to shared chassis heatsink while maintaining functional isolation between phases.

LED Constant-Current Driver

Offline Flyback SMPS

Use Scenario: High-efficiency constant-current driver for commercial LED streetlights operating from 90–305 VAC input.

IC Role / Device Role / Timing Role: Primary-side high-side switch regulating output current via primary-sense feedback.

Use Value: 650 V rating accommodates universal input with margin; 0.85 Ω R_DS(on) limits conduction loss to <1.2 W at 3.5 A LED string current.

Use Scenario: 65 W open-frame adapter for industrial control panels requiring reinforced isolation and long-term reliability.

IC Role / Device Role / Timing Role: Main power switch in discontinuous conduction mode (DCM) flyback converter.

Use Value: 320 mJ E_AS withstands transformer leakage energy without clamping diode, simplifying secondary-side design.

PFC Boost Converter

Brushless DC Motor Control

Use Scenario: Active front-end boost PFC stage in HVAC blower modules targeting >0.95 PF and <10% THD.

IC Role / Device Role / Timing Role: Switching element in continuous conduction mode (CCM) boost topology.

Use Value: Low Q_g (34 nC) enables efficient 65 kHz switching with minimal gate drive loss and reduced EMI filter size.

Use Scenario: Half-bridge high-side switch in 24 V BLDC motor driver for automated gate operators.

IC Role / Device Role / Timing Role: High-side power switch controlled via isolated gate driver in three-phase inverter leg.

Use Value: Insulated tab allows direct mounting to shared chassis heatsink while maintaining functional isolation between phases.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP8NK60ZFP	R_DS(on) = 0.75 Ω (slightly lower), Q_g = 32 nC, same TO-220FP package with insulated tab.	Identical use in flyback and PFC; slightly higher I_D rating (8.5 A) offers marginal thermal headroom.	Select when prioritizing lowest possible conduction loss at cost of marginally higher gate drive complexity.
FQP8N65CF	R_DS(on) = 0.88 Ω, Q_g = 36 nC, TO-220F package but no certified UIS rating.	Suitable for non-critical LED drivers; not recommended for high-reliability PFC or motor control with frequent overload events.	Choose for cost-sensitive consumer lighting where avalanche testing is not mandated by safety standards.

Compared with STP8NK60ZFP and FQP8N65CF, the AOTF8N65 delivers verified avalanche ruggedness and tighter R_DS(on) consistency across temperature, making it preferred for industrial-grade power conversion where field failure risk must be minimized.

Availability

AOTF8N65 is available at Aetrix Electronics and suitable for offline AC-DC power supplies, LED constant-current drivers, and industrial PFC boost converters requiring stable component supply and long-lifecycle support.

Supply support for AOTF8N65 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, and industrial markets.

The AOTF8N65 belongs to AOS's high-voltage SuperFET® II family, engineered specifically for high-efficiency, high-reliability offline power conversion with emphasis on ruggedness, low gate charge, and thermally optimized packaging.

FAQ

What is the maximum junction temperature rating for the AOTF8N65?

The AOTF8N65 has a maximum rated junction temperature of 150 °C. This limit is defined under steady-state thermal conditions with appropriate heatsinking and accounts for both conduction and switching losses. Operation beyond this temperature risks permanent degradation of the silicon die and must be avoided in all AOTF8N65 designs.

Does the AOTF8N65 require a gate resistor for reliable operation?

Yes, the AOTF8N65 requires an external gate resistor to control dV/dt and prevent parasitic oscillation during switching transitions. Typical values range from 10 Ω to 47 Ω depending on driver strength and layout inductance. Proper gate resistance selection ensures stable AOTF8N65 turn-on/turn-off behavior and minimizes EMI generation in high-frequency SMPS applications.

Is the AOTF8N65 suitable for use in automotive applications?

No, the AOTF8N65 is not qualified to AEC-Q101 or any automotive-grade reliability standard. It is rated for industrial and commercial environments only. For automotive applications requiring 650 V MOSFETs, designers should select AEC-Q101-qualified alternatives; the AOTF8N65 is intended for industrial power supplies, LED drivers, and similar non-automotive systems.

How does the insulated tab of the AOTF8N65 simplify thermal design?

The insulated tab of the AOTF8N65 provides 2500 V_RMS dielectric isolation between the drain and heatsink, allowing direct mounting to a grounded metal chassis without thermal pads or insulators. This reduces thermal resistance, lowers assembly cost, and improves long-term reliability compared to standard TO-220 variants-key advantages in compact AOTF8N65-based power modules.

What is the gate threshold voltage range for the AOTF8N65?

The AOTF8N65 has a gate threshold voltage (V_GS(th)) range of 3.0 V to 5.0 V at I_D = 250 µA. This ensures reliable turn-on with standard 5 V or 10 V logic-level gate drivers. However, full enhancement and minimum R_DS(on) are only achieved at V_GS ≥ 10 V, so the AOTF8N65 must be driven accordingly in production designs.

AOTF8N65 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):: 650 V

Current - Continuous Drain (Id) @ 25°C:: 8A (Tc)

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

Rds On (Max) @ Id, Vgs:: 1.15Ohm @ 4A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 28 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 1400 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

AOTF8N65 FAQ

1.How can I place an order for AOTF8N65 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOTF8N65 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 AOTF8N65 reliable?

The price and inventory of AOTF8N65 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOTF8N65 is usually 5 days.

3.What payment methods are accepted for AOTF8N65?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOTF8N65 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOTF8N65?

AOTF8N65 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOTF8N65 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 AOTF8N65?

For technical support, including AOTF8N65 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOTF8N65 requirements.

6.How does Aetrix verify that AOTF8N65 is sourced from the original manufacturer or authorized distributors?

All AOTF8N65 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 AOTF8N65 meets industry standards.

7.What is the process for return or replacement of AOTF8N65?

All AOTF8N65 units undergo pre-shipment inspection (PSI). If there is an issue with AOTF8N65, 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 AOTF8N65 part is unused and in its original packaging.

Return procedure for AOTF8N65:

1.Submit a request within 90 days.

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

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