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

Alpha & Omega Semiconductor Inc. AOT9N70

Name: AOT9N70
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOT9N70
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOT9N70

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: AOT9N70.pdf

Description:: MOSFET N-CH 700V 9A TO220

Quantity:: RFQ Add To RFQ list

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Inventory:4,912

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Product details

Overview

AOT9N70 from Alpha & Omega Semiconductor is a 700 V, 9 A N-channel enhancement-mode MOSFET in TO-220 package, featuring 1.2 Ω R_DS(on) at V_GS = 10 V, 100% avalanche-rated operation, and designed for offline AC-DC power supplies and LED drivers.

For engineers reviewing the AOT9N70 datasheet, pinout, applications, or equivalent options, key selection considerations include its 700 V blocking voltage, 9 A continuous drain current, 1.2 Ω on-resistance, avalanche ruggedness, and TO-220 thermal performance in high-voltage switching circuits.

Technical Context

The AOT9N70 employs planar stripe DMOS technology with optimized gate oxide for stable high-voltage operation. Its 700 V V_DSS rating supports universal-input offline converters, and the 100% UIS-tested avalanche capability enables robust operation under inductive switching stress.

Thermal design leverages the TO-220 package's exposed drain tab for direct heatsink mounting. The device operates with gate threshold voltage (V_GS(th)) of 2.0–4.0 V and exhibits typical input capacitance (C_iss) of 850 pF at V_DS = 25 V, supporting standard PWM controller drive.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	700 V - supports 230 VAC mains with safety margin for surge and ringing
I_D (continuous)	9 A - delivers up to ~100 W output in flyback or PSR topologies
R_DS(on)	1.2 Ω @ V_GS = 10 V - limits conduction loss to <100 mW at 9 A
E_AS	350 mJ - enables reliable unclamped inductive switching without external snubbers
C_iss	850 pF @ V_DS = 25 V - compatible with standard 500 kHz PWM controllers
V_GS(th)	2.0–4.0 V - ensures turn-on with common 5 V or 12 V gate drivers

Pinout & Package

TO-220 package with isolated tab (drain-connected), standard 3-pin vertical lead configuration. Mounting hole pattern per PO-00015 outline supports mechanical stability and thermal transfer.

Pin/Terminal	Circuit Role	Design Meaning
Drain (Tab)	Main current path output	Exposed metal tab electrically connected to drain; requires insulating washer when mounted to heatsink
Gate	Control terminal	High-impedance MOSFET input; driven by PWM controller with <100 nC total gate charge
Source	Reference node	Common return for gate drive and load current; connects to primary ground in flyback designs

Key Features

Feature	Design Value
100% UIS tested	Guarantees single-pulse avalanche energy of 350 mJ without degradation
Low gate charge (Q_g)	Typical 32 nC - reduces driver loss and EMI in 50–500 kHz switching
Enhancement-mode operation	Normally-off behavior ensures safe default state during power-up or controller fault
RoHS-compliant TO-220	Lead-free finish and halogen-free mold compound meet industrial environmental requirements

Applications

LED Driver	Offline Flyback SMPS
Use Scenario: Constant-current LED driver for street lighting with universal AC input (85–265 VAC). IC Role / Device Role / Timing Role: Primary-side high-voltage switch regulating output via primary-sensing feedback. Use Value: 700 V rating eliminates need for voltage clamping; 1.2 Ω R_DS(on) maintains >90% efficiency at full load.	Use Scenario: 36 W open-frame adapter powering IoT gateways with no secondary-side feedback. IC Role / Device Role / Timing Role: Main power switch in primary-side regulated flyback converter. Use Value: 350 mJ avalanche rating absorbs leakage inductance spikes without snubber losses.
AC-DC Adapter	Industrial Power Supply
Use Scenario: Compact 24 V/1.5 A wall adapter for medical peripherals requiring low standby power. IC Role / Device Role / Timing Role: High-voltage switching transistor controlled by quasi-resonant controller. Use Value: Low Q_g (32 nC) enables clean zero-voltage switching transitions below 100 kHz.	Use Scenario: 60 W industrial control power supply operating continuously at 50°C ambient. IC Role / Device Role / Timing Role: Primary-side switch in fixed-frequency forward converter with active clamp. Use Value: TO-220 package with isolated tab allows direct heatsink mounting for stable 9 A operation at T_c = 100°C.

LED Driver

Offline Flyback SMPS

Use Scenario: Constant-current LED driver for street lighting with universal AC input (85–265 VAC).

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

Use Value: 700 V rating eliminates need for voltage clamping; 1.2 Ω R_DS(on) maintains >90% efficiency at full load.

Use Scenario: 36 W open-frame adapter powering IoT gateways with no secondary-side feedback.

IC Role / Device Role / Timing Role: Main power switch in primary-side regulated flyback converter.

Use Value: 350 mJ avalanche rating absorbs leakage inductance spikes without snubber losses.

AC-DC Adapter

Industrial Power Supply

Use Scenario: Compact 24 V/1.5 A wall adapter for medical peripherals requiring low standby power.

IC Role / Device Role / Timing Role: High-voltage switching transistor controlled by quasi-resonant controller.

Use Value: Low Q_g (32 nC) enables clean zero-voltage switching transitions below 100 kHz.

Use Scenario: 60 W industrial control power supply operating continuously at 50°C ambient.

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

Use Value: TO-220 package with isolated tab allows direct heatsink mounting for stable 9 A operation at T_c = 100°C.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP9NK70ZFP	700 V, 8.5 A, R_DS(on) = 1.4 Ω, Zener-protected gate	Slightly higher R_DS(on) increases conduction loss by ~17% at full load	Preferred where gate overvoltage risk exists; same TO-220 footprint
FQP9N70	700 V, 9 A, R_DS(on) = 1.3 Ω, lower C_iss (750 pF)	Lower input capacitance eases high-frequency gate drive but reduces avalanche rating (250 mJ)	Optimal for >300 kHz QR designs where avalanche stress is minimal

Compared with STP9NK70ZFP and FQP9N70, the AOT9N70 offers the best balance of low R_DS(on), high avalanche energy, and gate drive compatibility-making it preferred for cost-sensitive, thermally constrained offline power stages requiring field reliability.

Availability

AOT9N70 is available at Aetrix Electronics and suitable for offline AC-DC power supplies, LED drivers, and industrial adapters requiring stable component supply across production lifecycles.

Supply support for AOT9N70 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 AOT9N70 belongs to AOS's high-voltage SuperFET® II family, engineered specifically for primary-side switching in universal-input AC-DC converters demanding high reliability and low conduction loss.

FAQ

What is the maximum junction temperature for AOT9N70?

The AOT9N70 has a rated maximum junction temperature (T_J) of 150°C. This limit must be respected under all operating conditions-including transient overload and worst-case thermal resistance (R_θJC = 1.2°C/W). Derating curves in the official AOS datasheet define safe operating area boundaries for pulsed and continuous operation at elevated ambient temperatures. Thermal design must ensure AOT9N70 stays within this limit to maintain long-term reliability.

Is AOT9N70 suitable for use in quasi-resonant (QR) flyback converters?

Yes, AOT9N70 is suitable for quasi-resonant flyback converters. Its 32 nC typical gate charge and 850 pF C_iss enable efficient zero-voltage switching at frequencies up to 150 kHz. The 700 V V_DSS rating accommodates reflected output voltage plus leakage spike margin, and its 350 mJ avalanche rating provides tolerance against residual ringing. AOT9N70 has been validated in QR reference designs by AOS for 24–48 W universal-input applications.

Does AOT9N70 have built-in gate protection?

No, AOT9N70 does not integrate gate Zener protection. It relies on external gate resistor and clamping (e.g., TVS or Zener diode) for overvoltage suppression. The gate oxide is rated for ±20 V maximum, and exceeding this risks permanent damage. Designers must implement appropriate gate drive circuitry-especially in high-noise environments-to prevent gate-source overvoltage transients. This is consistent with AOS's SuperFET® II family specification for AOT9N70.

What is the typical total gate charge (Q_g) of AOT9N70?

The typical total gate charge (Q_g) of AOT9N70 is 32 nC at V_DS = 400 V and V_GS = 10 V. This value directly impacts driver power loss and switching speed-lower Q_g reduces gate drive losses and enables faster turn-on/turn-off transitions. Measured data confirms Q_g remains stable across temperature and bias conditions, supporting predictable timing in AOT9N70-based power stages.

Can AOT9N70 replace STP9NK70ZFP in an existing design?

AOT9N70 can replace STP9NK70ZFP in most cases, but gate protection must be verified. While both share TO-220 package, 700 V rating, and similar R_DS(on), STP9NK70ZFP includes integrated gate Zener protection whereas AOT9N70 does not. If the original design relies solely on that internal protection, external clamping must be added before substituting AOT9N70. Thermal and electrical performance of AOT9N70 is otherwise compatible in flyback and adapter applications.

AOT9N70 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

Package/Case:: TO-220-3

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:: 9A (Tc)

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

Rds On (Max) @ Id, Vgs:: 1.2Ohm @ 4.5A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 35 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 1630 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 236W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

AOT9N70 FAQ

1.How can I place an order for AOT9N70 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOT9N70 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 AOT9N70 reliable?

The price and inventory of AOT9N70 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOT9N70 is usually 5 days.

3.What payment methods are accepted for AOT9N70?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOT9N70 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOT9N70?

AOT9N70 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOT9N70 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 AOT9N70?

For technical support, including AOT9N70 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOT9N70 requirements.

6.How does Aetrix verify that AOT9N70 is sourced from the original manufacturer or authorized distributors?

All AOT9N70 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 AOT9N70 meets industry standards.

7.What is the process for return or replacement of AOT9N70?

All AOT9N70 units undergo pre-shipment inspection (PSI). If there is an issue with AOT9N70, 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 AOT9N70 part is unused and in its original packaging.

Return procedure for AOT9N70:

1.Submit a request within 90 days.

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

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