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

Alpha & Omega Semiconductor Inc. AOT780A70L

Name: AOT780A70L
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOT780A70L
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOT780A70L

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: AOT780A70L.pdf

Description:: N

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AOT780A70L from Alpha & Omega Semiconductor is a 700 V, 28 A, N-channel enhancement-mode MOSFET in TO-220 package with R_DS(ON) ≤ 0.78 Ω at V_GS = 10 V, 11.5 nC total gate charge, and optimized for PFC and PWM stages in high-efficiency AC/DC power supplies including server, gaming, and industrial SMPS.

For engineers reviewing the AOT780A70L datasheet, pinout, applications, or equivalent options, key selection criteria include its 800 V avalanche-rated drain-source breakdown, 100% UIS-tested ruggedness, enhanced body diode with 230 ns reverse recovery time, and thermal resistance R_θJC = 1.4 °C/W for reliable high-current switching in thermally constrained designs.

Technical Context

This device implements Alpha & Omega's proprietary aMOS5™ technology to achieve low conduction loss and improved EMI performance via controlled switching transitions. Its dynamic parameters-including 2.8 nC Q_gd, 9 ns rise time, and 30 ns turn-off delay-are tuned for hard-switched flyback and resonant LLC topologies operating up to 400 V bus voltage.

The AOT780A70L features a robust body diode with 1.2 V forward voltage (V_SD) at 1.4 A and 2.5 mC Q_rr, enabling stable operation in continuous conduction mode (CCM) PFC. Thermal design is supported by a junction-to-case resistance of 1.4 °C/W and validated safe operating area up to 150 °C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	700 V rated, 800 V avalanche-tested - supports 400 V DC bus with margin for transient overvoltage in industrial/server PSUs
R_DS(ON)	≤ 0.78 Ω @ V_GS = 10 V - enables <1.5 W conduction loss at 28 A, reducing heatsink requirements
Q_g	11.5 nC typ - balances switching speed and gate drive loss in 65–300 kHz PFC/PWM stages
E_oss	1.4 mJ @ 400 V - lowers capacitive turn-on loss and improves light-load efficiency in resonant converters
T_J max	150 °C - allows sustained operation in high-ambient environments without derating below 100 °C case temperature
dv/dt ruggedness	100 V/ns - ensures immunity to false triggering during fast voltage transients in high-noise SMPS layouts

Pinout & Package

Package: TO-220 (3-lead, through-hole), standard outline with isolated tab. Mounting requires electrically insulating thermal interface and mechanical torque control per AOS specification.

Pin/Terminal	Circuit Role	Design Meaning
G (Gate)	Control electrode	Accepts 10 V logic-level drive; 3.1 Ω internal gate resistance reduces ringing and simplifies gate driver design
D (Drain)	High-side power output	Connected to primary winding or bus rail; rated for 800 V unclamped inductive switching (UIS)
S (Source)	Power return / reference node	Common return for gate drive and current sensing; ties to PCB ground plane with low-inductance layout

Key Features

Feature	Design Value
aMOS5™ process technology	Delivers 15% lower R_DS(ON) vs. prior generation while maintaining 700 V rating and improving dv/dt immunity
Enhanced body diode	230 ns t_rr, 16.5 A I_RM, and 2.5 mC Q_rr enable stable CCM operation without external snubbers in PFC boost stages
100% UIS tested	Each unit validated for unclamped inductive switching at rated current-ensures field reliability in overload/fault conditions
Optimized switching parameters	Low Crss (1.8 pF) and balanced Q_gd/Q_gs ratio suppress Miller-induced shoot-through in half-bridge configurations

Applications

Server Power Supply	Gaming PC Silverbox
Use Scenario: High-density 80 PLUS Titanium PSU with interleaved PFC and LLC resonant converter. IC Role / Device Role / Timing Role: Primary-side switching MOSFET in boost PFC stage and synchronous rectifier driver in LLC half-bridge. Use Value: Low R_DS(ON) and E_oss reduce conduction and switching losses at 200–300 kHz, enabling >96% full-load efficiency.	Use Scenario: Compact 1000 W ATX PSU with dual-stage PFC and asymmetric half-bridge topology. IC Role / Device Role / Timing Role: High-side switch in active clamp PFC and main switch in PWM-controlled forward converter. Use Value: 100 V/ns dv/dt ruggedness prevents false turn-on during rapid bus transients common in GPU load-dynamic systems.
Industrial SMPS	LED Driver
Use Scenario: 500 W open-frame power supply for factory automation controllers operating at 60 °C ambient. IC Role / Device Role / Timing Role: Main switch in flyback converter delivering isolated 24 V/20 A output. Use Value: R_θJC = 1.4 °C/W and 150 °C T_Jmax allow direct heatsink mounting without thermal derating up to 100 °C case temperature.	Use Scenario: Constant-current LED driver for high-bay lighting with analog dimming and surge protection. IC Role / Device Role / Timing Role: Switching element in buck-derived constant-current regulator with integrated overvoltage clamping. Use Value: 800 V BVDSS and 100% R_g tested ensure robustness against lightning-induced surges on AC mains input.

Server Power Supply

Gaming PC Silverbox

Use Scenario: High-density 80 PLUS Titanium PSU with interleaved PFC and LLC resonant converter.

IC Role / Device Role / Timing Role: Primary-side switching MOSFET in boost PFC stage and synchronous rectifier driver in LLC half-bridge.

Use Value: Low R_DS(ON) and E_oss reduce conduction and switching losses at 200–300 kHz, enabling >96% full-load efficiency.

Use Scenario: Compact 1000 W ATX PSU with dual-stage PFC and asymmetric half-bridge topology.

IC Role / Device Role / Timing Role: High-side switch in active clamp PFC and main switch in PWM-controlled forward converter.

Use Value: 100 V/ns dv/dt ruggedness prevents false turn-on during rapid bus transients common in GPU load-dynamic systems.

Industrial SMPS

LED Driver

Use Scenario: 500 W open-frame power supply for factory automation controllers operating at 60 °C ambient.

IC Role / Device Role / Timing Role: Main switch in flyback converter delivering isolated 24 V/20 A output.

Use Value: R_θJC = 1.4 °C/W and 150 °C T_Jmax allow direct heatsink mounting without thermal derating up to 100 °C case temperature.

Use Scenario: Constant-current LED driver for high-bay lighting with analog dimming and surge protection.

IC Role / Device Role / Timing Role: Switching element in buck-derived constant-current regulator with integrated overvoltage clamping.

Use Value: 800 V BVDSS and 100% R_g tested ensure robustness against lightning-induced surges on AC mains input.

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	800 V V_DS, R_DS(ON) = 0.85 Ω, Q_g = 14.5 nC, TO-220FP package (full-pack)	Higher gate charge increases driver loss; no 100% UIS test documentation	Preferred where cost sensitivity outweighs efficiency targets and layout space permits larger gate driver
IPP60R099C7	650 V V_DS, R_DS(ON) = 0.099 Ω, Q_g = 35 nC, TO-220 package, CoolMOS™ C7	Lower voltage rating limits use to ≤380 V DC bus; higher Q_g demands stronger gate driver	Only suitable for 380 V nominal bus designs where ultra-low R_DS(ON) justifies reduced voltage margin

Compared with STP7NK80ZFP and IPP60R099C7, the AOT780A70L delivers superior voltage margin for 400 V bus systems, lower gate charge for efficient high-frequency operation, and production-validated UIS ruggedness-making it optimal for mission-critical server and industrial power stages where reliability and thermal headroom are prioritized.

Availability

AOT780A70L is available at Aetrix Electronics and suitable for server power supplies, gaming PC silverboxes, and industrial SMPS requiring stable component supply, long-term lifecycle support, and traceable sourcing under AEC-Q200-aligned manufacturing controls.

Supply support for AOT780A70L 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 AOT780A70L belongs to AOS's aMOS5™ high-voltage MOSFET product line, engineered specifically for high-efficiency, high-reliability AC/DC conversion in demanding power supply applications where voltage margin, thermal stability, and ruggedness are critical.

FAQ

What is the maximum continuous drain current rating for AOT780A70L at 100°C case temperature?

The AOT780A70L supports 7 A continuous drain current at T_C = 100°C, as specified in the Absolute Maximum Ratings table. This derated value reflects thermal limitations when mounted on a heatsink without forced airflow. At T_C = 25°C, the device sustains 28 A continuously, limited by junction temperature. Designers must verify actual case temperature under operating conditions using R_θJC = 1.4 °C/W and system-level thermal modeling before finalizing heatsink sizing for AOT780A70L.

Does AOT780A70L have a fully characterized body diode suitable for synchronous rectification?

No, the AOT780A70L is not intended for synchronous rectification. Its body diode is enhanced for robustness in PFC and PWM freewheeling roles-not optimized for low V_SD or fast t_rr in SR applications. The datasheet specifies V_SD = 0.8–1.2 V and t_rr = 230 ns, which are adequate for boost PFC but exceed typical SR requirements (<100 ns, <0.5 V). For synchronous rectification, AOS recommends dedicated SR controllers paired with low-V_F Schottky or logic-level MOSFETs-not the AOT780A70L.

Is AOT780A70L pin-compatible with other devices in the AOT(B/F)780A70L family?

Yes, AOT780A70L shares identical TO-220 pinout (G-D-S) and electrical specifications with AOTF780A70L (TO-220F) and AOB780A70L (TO-263/D2PAK), though package mechanicals differ. All three share identical R_DS(ON), Q_g, BVDSS, and thermal characteristics. However, thermal resistance varies: AOT780A70L has R_θJC = 1.4 °C/W, while AOTF780A70L is 5.0 °C/W due to its full-pack isolation. PCB layout must match the specific package footprint for AOT780A70L.

What gate drive voltage is required to fully enhance AOT780A70L?

The AOT780A70L achieves its specified R_DS(ON) ≤ 0.78 Ω at V_GS = 10 V, with gate threshold voltage V_GS(th) ranging from 2.9 V to 4.1 V. A minimum gate drive of 10 V is recommended for full enhancement across temperature and process variation. Driving at 12–15 V is acceptable but offers diminishing returns; exceeding ±20 V absolute maximum risks gate oxide damage. Gate drive circuits must limit peak current to avoid overshoot, especially given the device's 3.1 Ω internal R_g.

Can AOT780A70L be used in automotive-grade power supplies?

The AOT780A70L is not qualified to AEC-Q101 and is not recommended for automotive power supplies. While its 150 °C T_Jmax and 100% UIS testing meet some automotive thermal and ruggedness expectations, AOS does not list it in their automotive product portfolio, and the datasheet explicitly excludes life-support and critical automotive applications. For automotive-grade alternatives, consult AOS's AUIRF series or contact Aetrix Electronics for AEC-Q101-compliant 700 V MOSFETs compatible with AOT780A70L's electrical profile.

AOT780A70L Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: aMOS5™

Package/Case:: TO-220-3

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:: 7A (Tc)

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

Rds On (Max) @ Id, Vgs:: 780mOhm @ 1.4A, 10V

Vgs(th) (Max) @ Id:: 4.1V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 11.5 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 675 pF @ 100 V

FET Feature:: -

Power Dissipation (Max):: 89W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

AOT780A70L FAQ

1.How can I place an order for AOT780A70L through Aetrix?

Please submit a Request for Quotation (RFQ) for AOT780A70L 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 AOT780A70L reliable?

The price and inventory of AOT780A70L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOT780A70L is usually 5 days.

3.What payment methods are accepted for AOT780A70L?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOT780A70L transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOT780A70L?

AOT780A70L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOT780A70L 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 AOT780A70L?

For technical support, including AOT780A70L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOT780A70L requirements.

6.How does Aetrix verify that AOT780A70L is sourced from the original manufacturer or authorized distributors?

All AOT780A70L 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 AOT780A70L meets industry standards.

7.What is the process for return or replacement of AOT780A70L?

All AOT780A70L units undergo pre-shipment inspection (PSI). If there is an issue with AOT780A70L, 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 AOT780A70L part is unused and in its original packaging.

Return procedure for AOT780A70L:

1.Submit a request within 90 days.

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

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