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

Alpha & Omega Semiconductor Inc. AOI450A70

Name: AOI450A70
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOI450A70
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOI450A70

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-251-3 Stub Leads, IPAK

Datasheet:: AOI450A70.pdf

Description:: N

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AOI450A70 from Alpha & Omega Semiconductor is a 700V, 44A N-channel enhancement-mode MOSFET in TO-251A (IPAK) package, featuring 0.45Ω max R_DS(ON), 20nC typical gate charge, and 2.5mJ E_OSS at 400V - designed for high-voltage PFC and LLC resonant converter stages in server, gaming PSU, and industrial power supplies.

For engineers reviewing the AOI450A70 datasheet, pinout, applications, or equivalent options, key selection criteria include its 800V V_DS rating at T_J,max, 100% UIS-tested ruggedness, enhanced body diode with 275ns reverse recovery time, and thermal resistance of 1°C/W junction-to-case - critical for high-reliability, high-efficiency SMPS designs.

Technical Context

This device uses proprietary aMOS5™ technology to achieve low conduction loss while maintaining robust switching performance. Its optimized capacitance profile (C_iss = 1115pF, C_oss = 30pF, C_rss = 2pF) and 6.7Ω gate resistance support controlled dv/dt and reduced EMI in hard-switched topologies.

The AOI450A70 integrates a fast, rugged body diode (V_SD = 0.8–1.2V, Q_rr = 3.5mC, t_rr = 275ns) and is rated for repetitive avalanche energy (E_AS = 6.8mJ), enabling reliable operation under transient overvoltage conditions without external snubbers.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	700V - supports primary-side switching in 400VAC+ input PFC and LLC converters
R_DS(ON), max	0.45Ω at V_GS = 10V - enables low conduction loss at 11A continuous drain current
Q_g, typ	20nC - determines gate drive power requirement and switching speed in 100–500kHz applications
E_OSS @ 400V	2.5mJ - quantifies output capacitance energy loss during turn-on, critical for ZVS design margin
t_rr	275ns - ensures fast body diode recovery in synchronous rectification and bidirectional topologies
T_J range	−55°C to +150°C - validated for industrial and server ambient temperature extremes
R_θJC	1°C/W - defines minimum heatsink interface requirement for 125W dissipation at T_C = 25°C

Pinout & Package

AOI450A70 is housed in a TO-251A (IPAK) surface-mount package with gull-wing leads, thermally optimized for PCB copper pad mounting. The case serves as the Drain terminal, enabling low-inductance, high-current routing.

Pin/Terminal	Circuit Role	Design Meaning
G	Gate	Controls channel conduction; requires 10V drive for full enhancement; 6.7Ω internal gate resistance limits peak dI/dt
D	Drain	High-voltage power node; electrically connected to exposed tab - must be isolated from heatsink unless referenced to same potential
S	Source	Power return path and gate reference; connects to PCB ground plane for low-noise switching and thermal conduction

Key Features

Feature	Design Value
aMOS5™ process technology	Enables 0.45Ω R_DS(ON) at 700V rating - 20% lower on-resistance vs. prior-gen 700V MOSFETs in same package
100% UIS tested	Guarantees unclamped inductive switching survival up to 6.8mJ - eliminates need for derating in flyback/LLC transient stress
Enhanced body diode	275ns t_rr and 3.5mC Q_rr reduce reverse recovery loss and EMI in quasi-resonant and synchronous rectifier circuits
Optimized switching parameters	C_iss/C_oss ratio >37:1 and low Crss enable stable, low-noise operation with minimal gate oscillation in high-dv/dt environments

Applications

Server Power Supply PFC Stage	Gaming PSU LLC Resonant Converter
Use Scenario: Boost PFC stage operating at 100–300kHz with 380–400VDC bus and 10–20A RMS input current. IC Role / Device Role / Timing Role: High-side switch in continuous conduction mode (CCM) boost converter; handles 700V blocking and 44A pulsed drain current. Use Value: 0.45Ω R_DS(ON) minimizes conduction loss at full load; 100% UIS testing ensures reliability during AC line surges and startup transients.	Use Scenario: Primary-side half-bridge switch in 300–700kHz LLC resonant converter powering GPU VRMs. IC Role / Device Role / Timing Role: High-frequency switching element with ZVS capability; leverages low E_OSS (2.5mJ @ 400V) for soft switching margin. Use Value: Fast 275ns body diode recovery enables clean ZVS transition; low Crss prevents spurious turn-on during high dv/dt dead-time intervals.
Industrial AC-DC Adapter	LED Driver Flyback Converter
Use Scenario: 60–100W universal-input (90–264VAC) adapter with active PFC and QR flyback secondary. IC Role / Device Role / Timing Role: PFC switch subjected to 100% duty-cycle stress during brownout; requires robust avalanche capability. Use Value: 6.8mJ E_AS rating and 100% R_g screening ensure consistent avalanche performance across production lots.	Use Scenario: Isolated flyback controller primary switch in 40–150W constant-current LED drivers for street lighting. IC Role / Device Role / Timing Role: High-voltage switch handling 700V DC link and 20–30A peak currents during dimming transients. Use Value: TO-251A package provides mechanical stability and thermal reliability in sealed outdoor enclosures; 150°C T_J,max supports extended lifetime at elevated ambient temperatures.

Server Power Supply PFC Stage

Gaming PSU LLC Resonant Converter

Use Scenario: Boost PFC stage operating at 100–300kHz with 380–400VDC bus and 10–20A RMS input current.

IC Role / Device Role / Timing Role: High-side switch in continuous conduction mode (CCM) boost converter; handles 700V blocking and 44A pulsed drain current.

Use Value: 0.45Ω R_DS(ON) minimizes conduction loss at full load; 100% UIS testing ensures reliability during AC line surges and startup transients.

Use Scenario: Primary-side half-bridge switch in 300–700kHz LLC resonant converter powering GPU VRMs.

IC Role / Device Role / Timing Role: High-frequency switching element with ZVS capability; leverages low E_OSS (2.5mJ @ 400V) for soft switching margin.

Use Value: Fast 275ns body diode recovery enables clean ZVS transition; low Crss prevents spurious turn-on during high dv/dt dead-time intervals.

Industrial AC-DC Adapter

LED Driver Flyback Converter

Use Scenario: 60–100W universal-input (90–264VAC) adapter with active PFC and QR flyback secondary.

IC Role / Device Role / Timing Role: PFC switch subjected to 100% duty-cycle stress during brownout; requires robust avalanche capability.

Use Value: 6.8mJ E_AS rating and 100% R_g screening ensure consistent avalanche performance across production lots.

Use Scenario: Isolated flyback controller primary switch in 40–150W constant-current LED drivers for street lighting.

IC Role / Device Role / Timing Role: High-voltage switch handling 700V DC link and 20–30A peak currents during dimming transients.

Use Value: TO-251A package provides mechanical stability and thermal reliability in sealed outdoor enclosures; 150°C T_J,max supports extended lifetime at elevated ambient temperatures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP7NK80ZFP	800V V_DS, 0.85Ω R_DS(ON), TO-220FP package, no UIS rating specified	Larger footprint, higher conduction loss, lacks 100% UIS test validation	Acceptable for cost-sensitive, lower-power (<65W) flyback where avalanche stress is minimal
IXTP50N10P	100V V_DS, 0.022Ω R_DS(ON), TO-220 package, 100% UIS rated	Not voltage-compatible - unsuitable for 400VDC+ bus applications	Only viable if system redesign reduces bus voltage; not a drop-in replacement for AOI450A70

Compared with STP7NK80ZFP and IXTP50N10P, the AOI450A70 uniquely combines 700V rating, sub-0.5Ω on-resistance, TO-251A surface-mount form factor, and factory-validated UIS robustness - making it the only option among the three qualified for high-density, high-reliability 100–300W server and industrial SMPS designs.

Availability

AOI450A70 is available at Aetrix Electronics and suitable for server power supply PFC stages, gaming PSU LLC converters, and industrial AC-DC adapters requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AOI450A70 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 AOI450A70 belongs to AOS's aMOS5™ high-voltage MOSFET product line, engineered specifically for efficiency-critical, high-reliability AC-DC and DC-DC conversion in datacenter, gaming, and industrial power systems.

FAQ

What is the maximum continuous drain current rating for AOI450A70 at TC = 25°C?

The AOI450A70 has a maximum continuous drain current (I_D) of 11A at T_C = 25°C, as defined by its thermal limit in the TO-251A package. This rating assumes adequate PCB copper area for heat dissipation and is derated linearly above 25°C per the 1.0°C/W junction-to-case thermal resistance. The AOI450A70 can sustain 44A pulsed current (I_DM) for short durations under controlled conditions.

Does AOI450A70 support zero-voltage switching (ZVS) in LLC resonant converters?

Yes, the AOI450A70 supports ZVS operation due to its low output capacitance energy - E_OSS is 2.5mJ at 400V - which directly impacts the required resonant tank energy to achieve soft turn-on. Its 30pF C_oss and 2pF C_rss also minimize capacitive coupling during dead time. The AOI450A70's body diode recovery characteristics (t_rr = 275ns, Q_rr = 3.5mC) further enhance ZVS reliability in high-frequency LLC topologies.

Is AOI450A70 pin-compatible with AOD450A70?

No, AOI450A70 is not pin-compatible with AOD450A70. While both share identical electrical specifications and belong to the same aMOS5™ family, AOI450A70 uses the TO-251A (IPAK) package with gull-wing leads, whereas AOD450A70 uses the TO-252 (DPAK) package with鸥翼 leads. Their land patterns, thermal pad layouts, and mechanical footprints differ - PCB layout changes are required when substituting AOI450A70 for AOD450A70 or vice versa.

What is the gate threshold voltage range for AOI450A70?

The AOI450A70 has a gate threshold voltage (V_GS(th)) range of 2.4V to 3.6V at T_J = 25°C, with a typical value of 3.0V. This ensures reliable turn-on with standard 5V or 10V gate drivers while maintaining noise immunity. The AOI450A70 is fully enhanced at V_GS = 10V, delivering its specified 0.45Ω R_DS(ON) and supporting gate drive designs compliant with JEDEC JESD78 latch-up immunity requirements.

How is avalanche ruggedness verified for AOI450A70?

Avalanche ruggedness for AOI450A70 is verified through 100% production testing using the unclamped inductive switching (UIS) method per JEDEC standard JESD24-1. Each unit is stressed with L = 1mH, I_AR = 2.5A, and V_DS = 700V, ensuring minimum single-pulse avalanche energy (E_AS) of 6.8mJ. The AOI450A70 is also 100% R_g-tested to guarantee consistent gate resistance and switching behavior across all units.

AOI450A70 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: aMOS5™

Package/Case:: TO-251-3 Stub Leads, IPAK

Packaging:: Tube

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 (Tc)

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):: 125W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-251A

AOI450A70 FAQ

1.How can I place an order for AOI450A70 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOI450A70 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 AOI450A70 reliable?

The price and inventory of AOI450A70 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOI450A70 is usually 5 days.

3.What payment methods are accepted for AOI450A70?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOI450A70 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOI450A70?

AOI450A70 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOI450A70 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 AOI450A70?

For technical support, including AOI450A70 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOI450A70 requirements.

6.How does Aetrix verify that AOI450A70 is sourced from the original manufacturer or authorized distributors?

All AOI450A70 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 AOI450A70 meets industry standards.

7.What is the process for return or replacement of AOI450A70?

All AOI450A70 units undergo pre-shipment inspection (PSI). If there is an issue with AOI450A70, 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 AOI450A70 part is unused and in its original packaging.

Return procedure for AOI450A70:

1.Submit a request within 90 days.

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

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