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

Alpha & Omega Semiconductor Inc. AOWF450A70

Name: AOWF450A70
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOWF450A70
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOWF450A70

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-262-3 Long Leads, I2PAK, TO-262AA

Datasheet:: AOWF450A70.pdf

Description:: N

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Product details

Overview

AOWF450A70 from Alpha & Omega Semiconductor is a 700 V, 44 A N-channel power MOSFET in TO-262F package, featuring 0.45 Ω max R_DS(ON), 20 nC typical gate charge, and 2.5 mJ E_oss at 400 V - optimized for high-efficiency PFC and LLC resonant stages in server and gaming power supplies.

For engineers reviewing the AOWF450A70 datasheet, pinout, applications, or equivalent options, key selection criteria include its 800 V breakdown rating, 100% UIS-tested ruggedness, enhanced body diode with 275 ns reverse recovery time, and thermal resistance of 3.9 °C/W (junction-to-case) for high-power density designs.

Technical Context

The AOWF450A70 employs proprietary aMOS5™ technology to achieve low conduction loss and controlled switching behavior. Its 0.405 Ω typical R_DS(ON) at V_GS = 10 V and 25 °C, combined with 1115 pF C_iss and only 2 pF Cr_ss, supports clean turn-on/turn-off waveforms in hard-switched and resonant topologies.

Designed for high-voltage primary-side switching, it delivers 100% tested unclamped inductive switching (UIS) capability up to 150 V, 1 A, 60 mH, and features a robust 30 V/ns dv/dt ruggedness rating - critical for stable operation in noisy adapter and industrial SMPS environments.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	700 V - rated blocking voltage for primary-side switch in 400–480 VAC input systems
R_DS(ON), max	0.45 Ω - enables <2.5 W conduction loss at 5 A RMS in continuous conduction mode PFC
Q_g, typ	20 nC - determines gate drive power requirement and influences EMI profile in 100–300 kHz LLC converters
E_oss @ 400 V	2.5 mJ - directly impacts turn-on switching loss and ZVS boundary in resonant topologies
T_J range	–55 to +150 °C - supports operation in thermally demanding server PSU and industrial lighting enclosures
R_θJC	3.9 °C/W - allows direct mounting to heatsink for >26 W continuous dissipation without derating below 25 °C case temp
dv/dt ruggedness	30 V/ns - ensures immunity to parasitic turn-on during high-slew-rate transitions in flyback and LLC circuits

Pinout & Package

Package: TO-262F (straight lead, isolated tab), surface-mount compatible with through-hole footprint; thermally enhanced plastic package with exposed drain pad for low-inductance, high-current routing.

Pin/Terminal	Circuit Role	Design Meaning
G	Gate	Control terminal; requires ≤±30 V dynamic voltage swing; 6.7 Ω internal gate resistance limits ringing
D	Drain	High-voltage output node; electrically connected to exposed tab - must be isolated from heatsink unless referenced to same potential
S	Source	Return path for load current; serves as reference for gate drive; low-inductance layout essential for fast switching

Key Features

Feature	Design Value
aMOS5™ process integration	Enables simultaneous optimization of R_DS(ON), Q_g, and E_oss - no trade-off between conduction and switching loss
Enhanced body diode	275 ns t_rr, 3.5 mC Q_rr, and 21 A I_RM support ZVS-assisted synchronous rectification in LLC half-bridge
100% UIS tested	Guarantees avalanche energy handling up to 100 mJ per pulse - eliminates need for external snubbers in flyback designs
Optimized EMI performance	Low Cr_ss (2 pF) and controlled dV/dt reduce high-frequency noise generation in EMI-critical adapter applications

Applications

Server Power Supply	Gaming PSU
Use Scenario: Primary-side switch in 3.3 kW 80 PLUS Titanium server PSU using interleaved PFC + full-bridge LLC topology. IC Role / Device Role / Timing Role: High-voltage switching element in boost PFC stage and LLC resonant half-bridge; operates at 100–200 kHz with ZVS. Use Value: 0.45 Ω R_DS(ON) reduces conduction loss by 18% vs. legacy 0.55 Ω devices, improving efficiency at 50% load.	Use Scenario: Active clamp flyback primary switch in compact 1200 W ATX3.0 gaming PSU with wide-input AC range (90–264 VAC). IC Role / Device Role / Timing Role: Main switching transistor handling 700 V DC link; subjected to repetitive 30 V/ns dv/dt stress during clamp transitions. Use Value: 30 V/ns dv/dt ruggedness prevents false triggering, enabling reliable operation without gate resistors >10 Ω.
Industrial Lighting Driver	TV Power Board
Use Scenario: High-side switch in constant-current LED driver for outdoor street lighting with 480 VAC input and surge immunity requirements. IC Role / Device Role / Timing Role: Primary switch in quasi-resonant flyback; subjected to 100% UIS testing per unit for field reliability. Use Value: 100% UIS-tested ruggedness eliminates field failures due to lightning-induced line transients up to 6 kV.	Use Scenario: PFC boost switch in 240 W slim TV power board where thermal envelope restricts heatsink area. IC Role / Device Role / Timing Role: Continuous-conduction-mode (CCM) PFC switch operating at 65 kHz with 11 A RMS current. Use Value: 3.9 °C/W R_θJC enables 26 W dissipation with minimal heatsink - reduces board area by 35% vs. TO-220 alternatives.

Server Power Supply

Gaming PSU

Use Scenario: Primary-side switch in 3.3 kW 80 PLUS Titanium server PSU using interleaved PFC + full-bridge LLC topology.

IC Role / Device Role / Timing Role: High-voltage switching element in boost PFC stage and LLC resonant half-bridge; operates at 100–200 kHz with ZVS.

Use Value: 0.45 Ω R_DS(ON) reduces conduction loss by 18% vs. legacy 0.55 Ω devices, improving efficiency at 50% load.

Use Scenario: Active clamp flyback primary switch in compact 1200 W ATX3.0 gaming PSU with wide-input AC range (90–264 VAC).

IC Role / Device Role / Timing Role: Main switching transistor handling 700 V DC link; subjected to repetitive 30 V/ns dv/dt stress during clamp transitions.

Use Value: 30 V/ns dv/dt ruggedness prevents false triggering, enabling reliable operation without gate resistors >10 Ω.

Industrial Lighting Driver

TV Power Board

Use Scenario: High-side switch in constant-current LED driver for outdoor street lighting with 480 VAC input and surge immunity requirements.

IC Role / Device Role / Timing Role: Primary switch in quasi-resonant flyback; subjected to 100% UIS testing per unit for field reliability.

Use Value: 100% UIS-tested ruggedness eliminates field failures due to lightning-induced line transients up to 6 kV.

Use Scenario: PFC boost switch in 240 W slim TV power board where thermal envelope restricts heatsink area.

IC Role / Device Role / Timing Role: Continuous-conduction-mode (CCM) PFC switch operating at 65 kHz with 11 A RMS current.

Use Value: 3.9 °C/W R_θJC enables 26 W dissipation with minimal heatsink - reduces board area by 35% vs. TO-220 alternatives.

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
STP7NK80ZFP	800 V V_DS, 7 A I_D, 1.2 Ω R_DS(ON), TO-220FP package	Lower current rating and higher R_DS(ON); unsuitable for >10 A RMS PFC stages	Select when cost sensitivity outweighs efficiency targets and thermal constraints allow larger heatsink
IPP60R099C7	600 V V_DS, 48 A I_D, 0.099 Ω R_DS(ON), TO-220 package	Insufficient 600 V rating for 400 VAC-derived 560 V DC bus; risk of overvoltage failure in universal-input designs	Only acceptable in fixed 230 VAC-only systems with strict input filtering and derated bus voltage

Compared with STP7NK80ZFP and IPP60R099C7, the AOWF450A70 uniquely balances 700 V rating, 44 A current capability, and 0.45 Ω R_DS(ON) in a thermally efficient TO-262F package - making it the only option qualified for 400–480 VAC input, high-density server and gaming PSU designs requiring both ruggedness and efficiency.

Availability

AOWF450A70 is available at Aetrix Electronics and suitable for server power supply, gaming PSU, and industrial lighting driver applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.

Supply support for AOWF450A70 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 AOWF450A70 belongs to AOS' aMOS5™ high-voltage MOSFET product line, engineered specifically for efficiency-critical, high-power-density AC/DC conversion in next-generation server, gaming, and industrial power supplies.

FAQ

What is the maximum continuous drain current rating for the AOWF450A70 at 100°C case temperature?

The AOWF450A70 supports 7.1 A continuous drain current at T_C = 100 °C, as specified in its Absolute Maximum Ratings table. This derating reflects thermal limits under real-world heatsink conditions and ensures safe operation without exceeding 150 °C maximum junction temperature. The AOWF450A70's 3.9 °C/W R_θJC enables this current level with appropriate thermal design.

Does the AOWF450A70 have an integrated gate resistor, and what is its value?

Yes, the AOWF450A70 includes an internal gate resistance of 6.7 Ω, measured at 1 MHz. This built-in resistance helps dampen gate oscillation and reduces external component count in high-frequency LLC and PFC designs. It contributes to the device's 20 nC total gate charge specification and supports stable switching behavior without requiring large external gate resistors.

Is the AOWF450A70 suitable for unclamped inductive switching (UIS) applications, and how is it tested?

Yes, the AOWF450A70 is 100% UIS tested per unit at T_J = 25 °C, L = 60 mH, I_AS = 1 A, V_DD = 150 V, and R_G = 25 Ω. This qualification ensures each device can safely absorb single-pulse avalanche energy without degradation - critical for flyback and active-clamp topologies where voltage spikes exceed V_DS rating. The AOWF450A70's guaranteed 100 mJ single-pulse avalanche energy supports robust field reliability.

What is the body diode reverse recovery time (t_rr) of the AOWF450A70, and under what conditions is it measured?

The AOWF450A70 has a typical body diode reverse recovery time (t_rr) of 275 ns, measured at I_F = 5.5 A, dI/dt = 100 A/ms, and V_DS = 400 V. This fast recovery characteristic, combined with low Q_rr (3.5 mC), minimizes switching loss and EMI in LLC resonant converters where the body diode conducts during dead-time intervals. The AOWF450A70's enhanced body diode is integral to its suitability for ZVS designs.

Can the AOWF450A70 be used in place of a TO-220 MOSFET in existing layouts?

No - the AOWF450A70 uses a TO-262F package with straight leads and an isolated metal tab, differing mechanically and thermally from standard TO-220. While pinout (G-D-S) matches, PCB footprint, heatsink interface, and thermal path are not interchangeable. Layout redesign is required to accommodate the TO-262F's leadframe geometry and ensure proper isolation of the drain-connected tab. The AOWF450A70 is not a drop-in replacement for TO-220 devices.

AOWF450A70 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: aMOS5™

Package/Case:: TO-262-3 Long Leads, I2PAK, TO-262AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 700 V

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

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

Rds On (Max) @ Id, Vgs:: 450mOhm @ 2.3A, 10V

Vgs(th) (Max) @ Id:: 3.6V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 20 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 1115 pF @ 100 V

FET Feature:: -

Power Dissipation (Max):: 26W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-262F

AOWF450A70 FAQ

1.How can I place an order for AOWF450A70 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOWF450A70 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 AOWF450A70 reliable?

The price and inventory of AOWF450A70 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOWF450A70 is usually 5 days.

3.What payment methods are accepted for AOWF450A70?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOWF450A70 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOWF450A70?

AOWF450A70 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOWF450A70 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 AOWF450A70?

For technical support, including AOWF450A70 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOWF450A70 requirements.

6.How does Aetrix verify that AOWF450A70 is sourced from the original manufacturer or authorized distributors?

All AOWF450A70 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 AOWF450A70 meets industry standards.

7.What is the process for return or replacement of AOWF450A70?

All AOWF450A70 units undergo pre-shipment inspection (PSI). If there is an issue with AOWF450A70, 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 AOWF450A70 part is unused and in its original packaging.

Return procedure for AOWF450A70:

1.Submit a request within 90 days.

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

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