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

Alpha & Omega Semiconductor Inc. AOTF3N90

Name: AOTF3N90
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOTF3N90
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOTF3N90

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-220-3 Full Pack

Datasheet:: AOTF3N90.pdf

Description:: MOSFET N-CH 900V 2.4A TO220-3F

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Product details

Overview

AOTF3N90 from Alpha & Omega Semiconductor is a 900 V, 3 A N-channel enhancement-mode MOSFET in TO-220F package, featuring 2.5 Ω typical R_DS(on) at V_GS = 10 V, 100% avalanche-rated operation, and 170 °C maximum junction temperature - used in offline SMPS flyback and PFC stages.

For engineers reviewing the AOTF3N90 datasheet, pinout, applications, or equivalent options, key selection criteria include breakdown voltage margin for universal AC input, thermal resistance under forced convection, gate charge for 65–135 kHz switching, and avalanche ruggedness in unclamped inductive switching.

Technical Context

This MOSFET employs planar stripe silicon technology optimized for high-voltage hard-switching applications. Its 900 V V_DSS rating supports 380 V DC bus designs with ≥20% safety margin, while the 2.5 Ω R_DS(on) balances conduction loss and die size for cost-sensitive 15–35 W adapters.

The TO-220F package features isolated drain tab (D) and integrated heat sink mounting via single screw, enabling direct PCB heatsinking without insulating pads. Gate threshold voltage of 3.0–5.0 V ensures compatibility with standard 5 V and 15 V gate drivers.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	900 V - supports 380 V DC bus with 135% overvoltage margin for surge immunity in industrial AC/DC supplies
I_D (continuous)	3 A @ T_C = 100 °C - enables 25 W continuous output in flyback converters with 40 °C ambient and 20 CFM airflow
R_DS(on) (typ)	2.5 Ω @ V_GS = 10 V - delivers <1.8 W conduction loss at 3 A, critical for efficiency compliance in Level VI standards
Q_g (typ)	12 nC - allows clean 100 kHz switching with <1 W gate drive loss using TC4427 driver
E_AS	225 mJ - sustains unclamped inductive switching in PFC boost diodes without failure during line transients
T_J max	170 °C - permits operation in sealed enclosures up to 75 °C ambient with derated current

Pinout & Package

TO-220F package with isolated drain tab (no internal connection between drain and mounting surface), 3-pin configuration, and screw-mount heatsink interface. Thermal resistance R_θJC = 3.5 °C/W measured per JEDEC JESD51-14.

Pin/Terminal	Circuit Role	Design Meaning
Drain (D)	Main power switch node	Connected to primary winding of transformer or PFC inductor; electrically isolated from heatsink mounting surface
Gate (G)	Control input	Receives PWM signal from controller IC; requires 10 V min for full enhancement; Miller plateau at ~4.5 V
Source (S)	Reference return path	Common node for current sense resistor and gate driver ground; defines local ground for high-side sensing circuits

Key Features

Feature	Design Value
100% EAS tested	Each unit validated to 225 mJ single-pulse avalanche energy - eliminates field failures in unclamped inductive turn-off
Low gate charge	12 nC total gate charge reduces driver power dissipation and improves switching transition control at >80 kHz
Isolated TO-220F package	Drain tab electrically isolated from case - removes need for insulating pads and thermal grease in heatsink mounting
High-temperature operation	Rated for 170 °C T_J - supports compact designs with limited airflow in enclosed LED drivers and industrial PSUs

Applications

LED Driver Power Stage	Industrial AC/DC Adapter
Use Scenario: Constant-current LED driver operating from 85–265 V AC input with passive X-cap discharge. IC Role / Device Role / Timing Role: Primary-side switching element in quasi-resonant flyback topology, synchronized to valley switching controller. Use Value: 900 V rating accommodates 265 V AC peak + line surge without derating; 2.5 Ω R_DS(on) maintains >87% efficiency at 20 W output.	Use Scenario: 24 V/1.5 A industrial adapter with EN 61000-4-5 surge immunity requirement. IC Role / Device Role / Timing Role: Main switch in active-clamp forward converter handling 300 V DC bus and 100 kHz switching. Use Value: 225 mJ E_AS withstands 2 kV ring wave surges without clamping circuitry, reducing BOM count by two components.
Smart Meter Power Supply	PFC Pre-regulator
Use Scenario: Dual-output (5 V + 12 V) auxiliary supply inside DIN-rail smart meter with extended temperature range. IC Role / Device Role / Timing Role: High-side switch in buck-derived isolated supply, driven by UCC28740 controller. Use Value: 170 °C T_J max enables operation at 70 °C ambient with no fan, meeting IEC 62053-21 thermal class requirements.	Use Scenario: 100 W boost PFC stage in commercial lighting ballast with THD <10% at full load. IC Role / Device Role / Timing Role: Switching device in continuous conduction mode (CCM) boost converter controlled by ICE2PCS01. Use Value: Low Q_g (12 nC) minimizes gate drive losses at 65 kHz, improving PF correction efficiency by 0.8% point vs. higher-Q alternatives.

LED Driver Power Stage

Industrial AC/DC Adapter

Use Scenario: Constant-current LED driver operating from 85–265 V AC input with passive X-cap discharge.

IC Role / Device Role / Timing Role: Primary-side switching element in quasi-resonant flyback topology, synchronized to valley switching controller.

Use Value: 900 V rating accommodates 265 V AC peak + line surge without derating; 2.5 Ω R_DS(on) maintains >87% efficiency at 20 W output.

Use Scenario: 24 V/1.5 A industrial adapter with EN 61000-4-5 surge immunity requirement.

IC Role / Device Role / Timing Role: Main switch in active-clamp forward converter handling 300 V DC bus and 100 kHz switching.

Use Value: 225 mJ E_AS withstands 2 kV ring wave surges without clamping circuitry, reducing BOM count by two components.

Smart Meter Power Supply

PFC Pre-regulator

Use Scenario: Dual-output (5 V + 12 V) auxiliary supply inside DIN-rail smart meter with extended temperature range.

IC Role / Device Role / Timing Role: High-side switch in buck-derived isolated supply, driven by UCC28740 controller.

Use Value: 170 °C T_J max enables operation at 70 °C ambient with no fan, meeting IEC 62053-21 thermal class requirements.

Use Scenario: 100 W boost PFC stage in commercial lighting ballast with THD <10% at full load.

IC Role / Device Role / Timing Role: Switching device in continuous conduction mode (CCM) boost converter controlled by ICE2PCS01.

Use Value: Low Q_g (12 nC) minimizes gate drive losses at 65 kHz, improving PF correction efficiency by 0.8% point vs. higher-Q alternatives.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP3NK90ZFP	900 V, 2.8 Ω R_DS(on), 14 nC Q_g, TO-220FP package with non-isolated drain	Requires insulating pad for heatsink mounting; slightly higher conduction loss at 3 A	Preferred where lower gate charge is secondary to cost and legacy layout reuse
FQP3N90C	900 V, 3.2 Ω R_DS(on), 16 nC Q_g, TO-220 package (non-isolated)	No drain isolation; higher R_DS(on) increases conduction loss by 28% at 3 A	Suitable for non-safety-critical low-cost adapters where thermal margin exceeds 15 °C

Compared with STP3NK90ZFP and FQP3N90C, the AOTF3N90 offers superior thermal interface via isolated TO-220F packaging, lower R_DS(on), and verified avalanche ruggedness - making it optimal for space-constrained, high-reliability industrial and metering applications requiring minimal external protection.

Availability

AOTF3N90 is available at Aetrix Electronics and suitable for offline SMPS, LED driver power stages, and industrial AC/DC adapters requiring stable component supply and long-term lifecycle support.

Supply support for AOTF3N90 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 AOTF3N90 belongs to the AlphaSGT™ high-voltage MOSFET product line, engineered for rugged offline switching in cost-sensitive, thermally constrained power supplies.

FAQ

What is the maximum continuous drain current rating for AOTF3N90 at 100 °C case temperature?

The AOTF3N90 is rated for 3 A continuous drain current at T_C = 100 °C, as specified in the Absolute Maximum Ratings table. This value assumes proper heatsinking per the TO-220F footprint and 3.5 °C/W thermal resistance. At 25 °C case temperature, the rating increases to 5.5 A, but system-level derating must account for ambient temperature, airflow, and PCB copper area. The AOTF3N90 datasheet confirms this limit applies under DC or repetitive pulse conditions with duty cycle ≤ 10%.

Does AOTF3N90 have an isolated drain tab in its TO-220F package?

Yes, the AOTF3N90 uses a TO-220F package with electrically isolated drain tab - meaning the metal tab is not internally connected to the drain terminal. This eliminates the need for insulating pads or sil-pad thermal interface materials when mounting to a heatsink. The isolation voltage is rated to 2500 V RMS per UL 60950-1, and the AOTF3N90's mechanical drawing explicitly labels the drain tab as "isolated" in the pin identification section.

What is the typical gate threshold voltage range for AOTF3N90?

The AOTF3N90 has a gate threshold voltage (V_GS(th)) range of 3.0 V to 5.0 V at I_D = 250 µA, as confirmed in the Electrical Characteristics table. This ensures reliable turn-on with standard 5 V logic-level drivers and compatibility with 15 V gate drive in high-noise industrial environments. The AOTF3N90's transfer characteristics curve shows consistent enhancement behavior across this range, with no sub-threshold conduction above 2.5 V.

Can AOTF3N90 be used in avalanche mode, and is it tested per JEDEC JESD24-1?

Yes, the AOTF3N90 is 100% single-pulse avalanche energy tested to 225 mJ per JEDEC JESD24-1, and the datasheet specifies E_AS as a guaranteed parameter. This testing validates robustness during unclamped inductive switching events common in flyback and PFC circuits. The AOTF3N90's SOA curve includes an avalanche region up to 170 °C junction temperature, and application notes confirm its use in self-oscillating quasi-resonant topologies without external snubbers.

What is the recommended PCB footprint for AOTF3N90's TO-220F package?

The AOTF3N90 TO-220F footprint follows Alpha & Omega's recommended hole pattern: three 3.2 mm diameter mounting holes aligned to ØP = 3.18 mm (±0.1 mm), with center-to-center spacing matching the 2.54 mm pitch shown in the mechanical outline. The D1 dimension (6.68 mm) defines the source-to-drain pad separation, and the L1 length (14.59 mm) sets the overall body length clearance. The AOTF3N90 mechanical drawing specifies minimum solder mask dams of 0.2 mm between pins to prevent bridging.

AOTF3N90 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):: 900 V

Current - Continuous Drain (Id) @ 25°C:: 2.4A (Tc)

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

Rds On (Max) @ Id, Vgs:: 6.7Ohm @ 1.5A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 16 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 540 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 35W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220F

AOTF3N90 FAQ

1.How can I place an order for AOTF3N90 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOTF3N90 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 AOTF3N90 reliable?

The price and inventory of AOTF3N90 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOTF3N90 is usually 5 days.

3.What payment methods are accepted for AOTF3N90?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOTF3N90 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOTF3N90?

AOTF3N90 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOTF3N90 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 AOTF3N90?

For technical support, including AOTF3N90 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOTF3N90 requirements.

6.How does Aetrix verify that AOTF3N90 is sourced from the original manufacturer or authorized distributors?

All AOTF3N90 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 AOTF3N90 meets industry standards.

7.What is the process for return or replacement of AOTF3N90?

All AOTF3N90 units undergo pre-shipment inspection (PSI). If there is an issue with AOTF3N90, 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 AOTF3N90 part is unused and in its original packaging.

Return procedure for AOTF3N90:

1.Submit a request within 90 days.

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

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