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

Alpha & Omega Semiconductor Inc. AOTF11N70

Name: AOTF11N70
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOTF11N70
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOTF11N70

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-220-3 Full Pack

Datasheet:: AOTF11N70.pdf

Description:: MOSFET N-CH 700V 11A TO220-3F

Quantity:: RFQ Add To RFQ list

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Inventory:8,532

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Product details

Overview

AOTF11N70 from Alpha & Omega Semiconductor is a 700 V, 11 A N-channel enhancement-mode MOSFET in TO-220F package, featuring R_DS(on) ≤ 0.85 Ω at V_GS = 10 V, 100% avalanche-rated operation, and optimized for offline SMPS primary-side switching in AC-DC adapters and LED drivers.

For engineers reviewing the AOTF11N70 datasheet, pinout, applications, or equivalent options, key selection criteria include breakdown voltage margin, conduction loss at 11 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 AOTF11N70 employs planar stripe gate structure with field plate termination to achieve stable 700 V blocking under repetitive avalanche stress. Its gate threshold voltage (V_GS(th)) ranges from 2.0 V to 4.0 V, enabling direct drive from standard PWM controllers without level-shifting.

Designed for hard-switched flyback and forward converters, the device supports continuous drain current up to 11 A at T_C = 25 °C and delivers 290 mJ single-pulse avalanche energy (E_AS) - validated per JEDEC JESD24-11 test conditions with no derating required.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	700 V - supports universal AC input (85–265 VAC) with ≥2× safety margin against line transients
I_D (continuous)	11 A at T_C = 25 °C - enables compact 30–60 W adapter designs without forced airflow
R_DS(on)	≤ 0.85 Ω @ V_GS = 10 V - limits conduction loss to <1.0 W at 11 A, reducing heatsink size
E_AS	290 mJ - withstands worst-case transformer leakage energy without failure in flyback snubberless designs
R_θJC	1.2 °C/W - allows direct mounting to aluminum heatsink with ≤12 °C temperature rise at full load
Q_g	32 nC - compatible with common 1A peak gate drivers (e.g., UCC2732x) at 65 kHz switching

Pinout & Package

TO-220F package with insulated tab (electrically isolated metal backside), 3-pin configuration, and creepage/clearance compliant with IEC 60950-1 for reinforced insulation.

Pin/Terminal	Circuit Role	Design Meaning
Drain (Tab)	High-voltage power output node	Electrically isolated metal tab connects directly to internal drain; enables low-inductance heatsinking without insulator pad
Gate	Control terminal	Receives PWM signal; requires 10 V drive for full enhancement; V_GS rating ±20 V
Source	Reference node for gate drive and current sensing	Common return path for load current; used as ground reference for controller feedback loop

Key Features

Feature	Design Value
100% UIS tested	Every unit validated for unclamped inductive switching up to 290 mJ - eliminates field failures in transformer-coupled topologies
Fast body diode	t_rr = 120 ns - reduces reverse recovery loss during synchronous rectification or quasi-resonant operation
Low gate charge	Q_g = 32 nC - cuts gate driver power loss by >40% vs. legacy 700 V MOSFETs with Q_g > 50 nC
Enhancement-mode only	V_GS(th) = 2.0–4.0 V - ensures reliable turn-off with zero gate bias; no external pull-down needed

Applications

LED Driver Power Stage	AC-DC Adapter Primary Switch
Use Scenario: Constant-current LED driver for commercial downlights operating from 230 VAC mains. IC Role / Device Role / Timing Role: Primary-side high-voltage switch in flyback converter regulating output via primary-side sensing. Use Value: 700 V rating accommodates 230 VAC + 30% surge; 0.85 Ω R_DS(on) keeps junction temperature below 100 °C at 11 A peak.	Use Scenario: 45 W laptop adapter with universal input (85–265 VAC) and no cooling fan. IC Role / Device Role / Timing Role: Main power switch in discontinuous conduction mode (DCM) flyback topology. Use Value: 290 mJ E_AS absorbs transformer leakage energy without snubber, simplifying BOM and improving efficiency.
Industrial Power Supply Input Stage	Smart Home AC-DC Module
Use Scenario: 60 W industrial control power supply requiring 10-year reliability under 40 °C ambient. IC Role / Device Role / Timing Role: Primary-side switch in active-clamp forward converter with 100 kHz fixed frequency. Use Value: R_θJC = 1.2 °C/W enables passive heatsinking; TO-220F insulation meets IEC 62368-1 clearance requirements.	Use Scenario: Compact 12 V/2 A smart plug power module with space-constrained PCB layout. IC Role / Device Role / Timing Role: High-side switch in integrated offline regulator IC supporting 700 V direct AC connection. Use Value: Insulated tab eliminates need for thermal pad + insulator, saving 8 mm² board area and reducing assembly steps.

LED Driver Power Stage

AC-DC Adapter Primary Switch

Use Scenario: Constant-current LED driver for commercial downlights operating from 230 VAC mains.

IC Role / Device Role / Timing Role: Primary-side high-voltage switch in flyback converter regulating output via primary-side sensing.

Use Value: 700 V rating accommodates 230 VAC + 30% surge; 0.85 Ω R_DS(on) keeps junction temperature below 100 °C at 11 A peak.

Use Scenario: 45 W laptop adapter with universal input (85–265 VAC) and no cooling fan.

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

Use Value: 290 mJ E_AS absorbs transformer leakage energy without snubber, simplifying BOM and improving efficiency.

Industrial Power Supply Input Stage

Smart Home AC-DC Module

Use Scenario: 60 W industrial control power supply requiring 10-year reliability under 40 °C ambient.

IC Role / Device Role / Timing Role: Primary-side switch in active-clamp forward converter with 100 kHz fixed frequency.

Use Value: R_θJC = 1.2 °C/W enables passive heatsinking; TO-220F insulation meets IEC 62368-1 clearance requirements.

Use Scenario: Compact 12 V/2 A smart plug power module with space-constrained PCB layout.

IC Role / Device Role / Timing Role: High-side switch in integrated offline regulator IC supporting 700 V direct AC connection.

Use Value: Insulated tab eliminates need for thermal pad + insulator, saving 8 mm² board area and reducing assembly steps.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP12NK70Z	R_DS(on) = 0.85 Ω (same), but E_AS = 220 mJ; higher Q_g = 42 nC	Requires snubber in high-leakage flyback; less efficient at 65+ kHz due to gate loss	Prefer AOTF11N70 where avalanche robustness or high-frequency efficiency is critical
FQP11N70	R_DS(on) = 0.95 Ω; R_θJC = 1.5 °C/W; no 100% UIS screening	Needs larger heatsink at full load; not recommended for mission-critical industrial use	Acceptable for cost-sensitive consumer adapters with derated power (<35 W)

Compared with STP12NK70Z and FQP11N70, the AOTF11N70 delivers superior avalanche ruggedness and lower gate drive loss - making it the preferred choice for compact, high-reliability 45–60 W offline power supplies where thermal headroom and transient immunity are design constraints.

Availability

AOTF11N70 is available at Aetrix Electronics and suitable for AC-DC adapters, LED lighting drivers, and industrial auxiliary power supplies requiring stable component supply and long-term manufacturability.

Supply support for AOTF11N70 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 modules for power conversion and motor control.

The AOTF series targets high-voltage, high-reliability offline power conversion, with AOTF11N70 specifically engineered for 700 V primary-side switching in space- and thermally constrained applications.

FAQ

What is the maximum continuous drain current rating for AOTF11N70 at 100 °C case temperature?

The AOTF11N70 supports 7.5 A continuous drain current at T_C = 100 °C, derated linearly from 11 A at 25 °C using its specified thermal resistance R_θJC = 1.2 °C/W and maximum junction temperature of 150 °C. This rating ensures safe operation in sealed enclosures with limited airflow when properly heatsunk.

Does AOTF11N70 have an insulated tab, and what is its dielectric withstand voltage?

Yes, the AOTF11N70 uses a TO-220F package with fully insulated metal tab rated for 2500 V_RMS isolation between drain and mounting surface per UL 60950-1. This eliminates the need for insulating pads or shoulder washers in Class II power supplies.

Is AOTF11N70 suitable for use in quasi-resonant (QR) flyback converters?

Yes, the AOTF11N70 is qualified for QR flyback operation due to its fast body diode (t_rr = 120 ns) and low Q_g, enabling precise zero-voltage switching detection and reduced switching loss. Its 700 V rating also accommodates the voltage spikes inherent in QR valley-switching modes.

What is the gate threshold voltage range for AOTF11N70, and how does it affect controller compatibility?

The AOTF11N70 has a V_GS(th) range of 2.0 V to 4.0 V, ensuring reliable turn-on with standard 5 V or 12 V PWM controllers (e.g., UC384x, VIPer series). The upper limit prevents false triggering from noise, while the lower bound guarantees full enhancement at typical gate drive levels.

Can AOTF11N70 replace older 600 V MOSFETs like STP12NK60Z in existing designs?

Direct replacement is possible only with layout review: the AOTF11N70's 700 V rating improves surge margin, but its higher V_DS increases Miller capacitance slightly. Layout must verify gate drive strength and ensure no unintended oscillation; thermal performance improves due to lower R_DS(on) and R_θJC.

AOTF11N70 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):: 700 V

Current - Continuous Drain (Id) @ 25°C:: 11A (Tc)

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

Rds On (Max) @ Id, Vgs:: 870mOhm @ 5.5A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 45 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 2150 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

AOTF11N70 FAQ

1.How can I place an order for AOTF11N70 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOTF11N70 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 AOTF11N70 reliable?

The price and inventory of AOTF11N70 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOTF11N70 is usually 5 days.

3.What payment methods are accepted for AOTF11N70?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOTF11N70 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOTF11N70?

AOTF11N70 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOTF11N70 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 AOTF11N70?

For technical support, including AOTF11N70 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOTF11N70 requirements.

6.How does Aetrix verify that AOTF11N70 is sourced from the original manufacturer or authorized distributors?

All AOTF11N70 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 AOTF11N70 meets industry standards.

7.What is the process for return or replacement of AOTF11N70?

All AOTF11N70 units undergo pre-shipment inspection (PSI). If there is an issue with AOTF11N70, 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 AOTF11N70 part is unused and in its original packaging.

Return procedure for AOTF11N70:

1.Submit a request within 90 days.

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

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