Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Alpha & Omega Semiconductor Inc. AOTF9N70

Name: AOTF9N70
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOTF9N70
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: AOTF9N70

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-220-3 Full Pack

Datasheet:: AOTF9N70.pdf

Description:: MOSFET N-CH 700V 9A TO220-3F

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,394

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

AOTF9N70 from Alpha & Omega Semiconductor is a 700 V, 9 A N-channel enhancement-mode MOSFET in TO-220F package, featuring R_DS(on) ≤ 1.2 Ω at V_GS = 10 V, 100% avalanche-rated operation, and 150 °C maximum junction temperature - used in offline SMPS primary-side switching, AC-DC adapters, and industrial power supplies.

For engineers reviewing the AOTF9N70 datasheet, pinout, applications, or equivalent options, key selection criteria include breakdown voltage margin, conduction loss at 9 A DC, thermal performance in TO-220F with insulated backside, and unclamped inductive switching (UIS) capability for flyback and forward converter designs.

Technical Context

The AOTF9N70 employs planar stripe gate structure and optimized drift region doping to achieve 700 V blocking with low specific on-resistance. Its TO-220F package features an electrically insulated tab enabling direct heatsink mounting without isolation hardware.

Designed for hard-switched topologies, the device supports continuous drain current up to 9 A at T_C = 25 °C and delivers 100% rated UIS energy (E_AS = 145 mJ) per JEDEC JESD24-11, with gate threshold voltage V_GS(th) specified between 2.0 V and 4.0 V.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	700 V - supports 400 VAC input with ≥2× safety margin in universal-input offline converters
I_D (continuous)	9 A at T_C = 25 °C - enables 65–100 W SMPS designs with forced-air cooling
R_DS(on) max	1.2 Ω at V_GS = 10 V - determines conduction loss of ≤100 W at full load in 9 A switch node
E_AS	145 mJ - ensures reliable operation under worst-case inductive turn-off in flyback snubberless designs
T_J max	150 °C - allows sustained operation in enclosed industrial enclosures without derating below 85 °C ambient
Q_g	32 nC - defines gate drive power requirement for 100 kHz switching with <1 W driver loss

Pinout & Package

TO-220F package with electrically insulated flange (non-conductive coating), 3-pin single-ended configuration, 15.87 mm × 10.16 mm × 4.70 mm body, and 3.18 mm mounting hole diameter.

Pin/Terminal	Circuit Role	Design Meaning
Drain (Tab)	High-voltage power output node	Electrically isolated flange allows direct heatsink attachment without thermal pad or insulator
Gate	Control input	Threshold voltage 2.0–4.0 V enables direct drive from UC384x or TL494 PWM controllers
Source	Power return reference	Common return path for gate drive and current sensing; referenced to primary ground in flyback

Key Features

Feature	Design Value
100% UIS tested	Guarantees robustness against inductive kickback in transformer-coupled topologies without external clamping
Insulated TO-220F package	Eliminates need for mica washers or silicone pads in heatsink mounting - reduces thermal resistance by ~0.5 °C/W
Low gate charge (Q_g)	32 nC enables efficient 100 kHz operation with standard bipolar gate drivers (e.g., TC4420)
Enhancement-mode only	No external bias required - simplifies startup sequencing in offline PSUs with no risk of shoot-through

Applications

AC-DC Adapter Primary Switch	Flyback Converter in Industrial PSU
Use Scenario: 65 W universal-input adapter operating at 65 kHz with 400 VDC bus. IC Role / Device Role / Timing Role: Main high-side switching element controlled by UC3842 PWM IC. Use Value: 700 V rating provides 1.75× margin over 400 VDC bus; R_DS(on) ≤ 1.2 Ω limits conduction loss to <1.5 W at full load.	Use Scenario: 100 W industrial power supply with wide ambient range (−25 °C to +70 °C). IC Role / Device Role / Timing Role: Primary-side power switch in discontinuous conduction mode (DCM) flyback. Use Value: 150 °C T_J max and 145 mJ E_AS ensure reliability during cold-start surges and line transients.
LED Driver Bulk Switch	Offline Charger Front-End Switch
Use Scenario: Constant-current LED driver for street lighting with 230 VAC input. IC Role / Device Role / Timing Role: High-voltage switch in buck-boost PFC-less topology. Use Value: TO-220F insulation enables compact heatsinking in sealed outdoor enclosures without creepage compromises.	Use Scenario: 48 V/2 A laptop charger with active clamp flyback architecture. IC Role / Device Role / Timing Role: Main switch handling 700 V transient spikes during clamp release. Use Value: 100% UIS qualification prevents failure during repeated clamp energy recycling cycles.

AC-DC Adapter Primary Switch

Flyback Converter in Industrial PSU

Use Scenario: 65 W universal-input adapter operating at 65 kHz with 400 VDC bus.

IC Role / Device Role / Timing Role: Main high-side switching element controlled by UC3842 PWM IC.

Use Value: 700 V rating provides 1.75× margin over 400 VDC bus; R_DS(on) ≤ 1.2 Ω limits conduction loss to <1.5 W at full load.

Use Scenario: 100 W industrial power supply with wide ambient range (−25 °C to +70 °C).

IC Role / Device Role / Timing Role: Primary-side power switch in discontinuous conduction mode (DCM) flyback.

Use Value: 150 °C T_J max and 145 mJ E_AS ensure reliability during cold-start surges and line transients.

LED Driver Bulk Switch

Offline Charger Front-End Switch

Use Scenario: Constant-current LED driver for street lighting with 230 VAC input.

IC Role / Device Role / Timing Role: High-voltage switch in buck-boost PFC-less topology.

Use Value: TO-220F insulation enables compact heatsinking in sealed outdoor enclosures without creepage compromises.

Use Scenario: 48 V/2 A laptop charger with active clamp flyback architecture.

IC Role / Device Role / Timing Role: Main switch handling 700 V transient spikes during clamp release.

Use Value: 100% UIS qualification prevents failure during repeated clamp energy recycling cycles.

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, TO-220FP package	Lower I_D rating and higher R_DS(on); gate protection adds 15% gate capacitance	Preferred where gate ESD robustness is prioritized over conduction loss
IPP60R190C6	600 V, 17 A, R_DS(on) = 0.19 Ω, Superjunction, TO-220 package (non-insulated)	Lower voltage rating requires redesign for 400 VDC bus; non-insulated tab needs isolation hardware	Selected when efficiency >75 W output is critical and board space allows extra insulation layer

Compared with STP9NK70ZFP and IPP60R190C6, the AOTF9N70 uniquely balances 700 V rating, 9 A current capability, insulated TO-220F packaging, and 1.2 Ω R_DS(on) - making it optimal for cost-sensitive, thermally constrained 65–100 W offline converters requiring no gate protection or external isolation.

Availability

AOTF9N70 is available at Aetrix Electronics and suitable for AC-DC adapters, industrial power supplies, LED drivers, and offline battery chargers requiring stable component supply across multi-year production cycles.

Supply support for AOTF9N70 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 computing, consumer, and industrial markets.

The AOTF9N70 belongs to AOS's high-voltage planar MOSFET product line, engineered specifically for rugged, cost-effective primary-side switching in universal-input offline power conversion systems.

FAQ

What is the maximum continuous drain current rating for AOTF9N70 at case temperature 100 °C?

The AOTF9N70 supports 5.8 A continuous drain current at T_C = 100 °C, derived from its 9 A rating at 25 °C and thermal derating curve. This value reflects real-world thermal limits in enclosed power supplies where heatsink temperature reaches 100 °C. The AOTF9N70 maintains safe operation within SOA boundaries under these conditions when mounted on a 15 cm² aluminum heatsink with 1.5 W thermal resistance.

Does AOTF9N70 have integrated gate protection diodes?

No, the AOTF9N70 does not include integrated gate-source Zener protection. It relies on external gate resistors and TVS clamps for ESD and transient suppression. This design choice preserves low gate charge (32 nC) and fast switching, consistent with AOS's planar MOSFET architecture. Users must implement discrete gate protection per IEC 61000-4-2 Level 4 requirements when deploying the AOTF9N70 in end equipment.

Can AOTF9N70 be used in synchronous rectification configurations?

No, the AOTF9N70 is not suitable for synchronous rectification due to its high R_DS(on) (1.2 Ω) and lack of optimized body diode recovery characteristics. It is designed exclusively for high-side switching in hard-switched topologies. For secondary-side synchronous rectification, AOS recommends dedicated low-V_DS logic-level MOSFETs such as AO4407 or AOD4185 - not the AOTF9N70.

What is the typical total gate charge (Q_g) of AOTF9N70 at V_GS = 10 V?

The typical total gate charge (Q_g) of AOTF9N70 is 32 nC at V_GS = 10 V and V_DS = 400 V, measured per JEDEC JESD24-10. This value directly determines gate driver power dissipation and switching speed trade-offs. When designing with the AOTF9N70, a 1 A peak gate driver (e.g., UCC27531) achieves <50 ns turn-on delay while keeping driver losses below 0.8 W at 100 kHz.

Is the TO-220F package of AOTF9N70 compatible with standard TO-220 heatsinks?

Yes, the TO-220F package of AOTF9N70 uses standard TO-220 mechanical dimensions and mounting hole pattern (Ø3.18 mm), ensuring full compatibility with off-the-shelf TO-220 heatsinks. The insulated flange eliminates electrical isolation hardware but retains identical thermal interface geometry - allowing direct bolt-down to aluminum heatsinks without modification to existing mechanical layouts using the AOTF9N70.

AOTF9N70 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:: 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):: 50W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220F

AOTF9N70 FAQ

1.How can I place an order for AOTF9N70 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOTF9N70 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 AOTF9N70 reliable?

The price and inventory of AOTF9N70 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOTF9N70 is usually 5 days.

3.What payment methods are accepted for AOTF9N70?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOTF9N70 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOTF9N70?

AOTF9N70 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOTF9N70 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 AOTF9N70?

For technical support, including AOTF9N70 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOTF9N70 requirements.

6.How does Aetrix verify that AOTF9N70 is sourced from the original manufacturer or authorized distributors?

All AOTF9N70 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 AOTF9N70 meets industry standards.

7.What is the process for return or replacement of AOTF9N70?

All AOTF9N70 units undergo pre-shipment inspection (PSI). If there is an issue with AOTF9N70, 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 AOTF9N70 part is unused and in its original packaging.

Return procedure for AOTF9N70:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-11 Comparator Circuit: Voltage Thresholds, Op-Amp Differences, LM393 and Practical Design

Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.

2026-09-10 Schmitt Trigger Explained: Hysteresis, Circuits, Inverters and Applications

Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …