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

Alpha & Omega Semiconductor Inc. AOD780A70

Name: AOD780A70
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOD780A70
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOD780A70

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: AOD780A70.pdf

Description:: N

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AOD780A70 from Alpha & Omega Semiconductor is a 700V, 28A N-channel power MOSFET in TO-252 (DPAK) package, featuring 0.78Ω max R_DS(ON), 11.5nC typical gate charge, and 1.4mJ E_oss at 400V - optimized for high-voltage PFC and LLC resonant converter stages in server, gaming, and industrial power supplies.

For engineers reviewing the AOD780A70 datasheet, pinout, applications, or equivalent options, key selection criteria include avalanche ruggedness (100% UIS tested), body-diode reverse recovery performance (t_rr = 230ns, Q_rr = 2.5mC), thermal resistance (R_θJC = 1.5°C/W), and aMOS5™ technology enabling low EMI switching in high-frequency SMPS designs.

Technical Context

This device implements a planar high-voltage trench-gated structure using proprietary aMOS5™ process, delivering enhanced dv/dt ruggedness (100 V/ns) and robust unclamped inductive switching capability. Its optimized gate charge profile (Q_gd/Q_g = 24%) supports clean turn-off with reduced Miller-induced oscillation in hard-switched topologies.

The integrated body diode exhibits fast reverse recovery (t_rr = 230ns, I_RM = 16.5A) and low forward voltage (V_SD = 1.2V typ), enabling reliable operation in synchronous rectification and bidirectional power flow applications without external Schottky supplementation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	700V - supports 400V AC input PFC stages with 1.75× safety margin against line surges
R_DS(ON),max	0.78Ω @ V_GS = 10V - enables <1.5W conduction loss at 1.7A RMS in continuous conduction mode
Q_g,typ	11.5nC - allows efficient drive with standard 1A gate drivers at 300kHz switching frequency
E_oss	1.4mJ @ 400V - reduces turn-on switching loss in ZVS/ZCS resonant converters
t_rr	230ns - minimizes body-diode commutation loss and EMI in bridge-leg transitions
R_θJC	1.5°C/W - permits >25W power dissipation with moderate heatsinking in TO-252 footprint
I_DM	28A - sustains peak currents during LLC startup and overload transients without thermal runaway

Pinout & Package

Package: TO-252 (DPAK), surface-mount, single-ended drain tab, thermally enhanced plastic case with exposed copper drain pad.

Pin/Terminal	Circuit Role	Design Meaning
G	Gate	Control terminal for MOSFET channel; requires ≤±20V drive; 3.1Ω internal gate resistance limits ringing
D	Drain	Main high-side current path; electrically connected to exposed copper pad for thermal and electrical sinking
S	Source	Reference node for gate drive and current sensing; ties to power ground plane in half-bridge layouts

Key Features

Feature	Design Value
aMOS5™ technology	Enables 700V breakdown with sub-0.8Ω R_DS(ON) in DPAK, reducing silicon area vs. legacy processes
100% UIS tested	Guarantees minimum single-pulse avalanche energy of 4.5mJ, supporting reliable overcurrent protection
Enhanced body diode	230ns t_rr and 2.5mC Q_rr reduce reverse recovery losses in LLC and phase-shifted full-bridge topologies
Optimized switching parameters	Low Crss (1.8pF) and Q_gd/Q_g ratio suppress Miller-induced shoot-through in high-dv/dt environments
100% R_g tested	Ensures consistent gate drive timing and predictable switching behavior across production lots

Applications

Server Power Supply PFC Stage	Gaming PSU LLC Resonant Converter
Use Scenario: Active clamp PFC boost stage operating at 65–100kHz with 380–400V DC bus in 1.5kW server silver box. IC Role / Device Role / Timing Role: High-side switching element handling 10A RMS input current; synchronized to controller via gate driver. Use Value: 0.78Ω R_DS(ON) limits conduction loss to <1.2W; 1.4mJ E_oss reduces turn-on loss by 35% vs. comparable 800V MOSFETs.	Use Scenario: Primary-side switch in asymmetric half-bridge LLC resonant converter powering GPU VRMs in high-end gaming PSUs. IC Role / Device Role / Timing Role: ZVS-capable primary switch operating up to 350kHz; body diode conducts resonant current during dead time. Use Value: 230ns t_rr and low Q_rr prevent voltage spikes and reduce EMI; 100% UIS rating ensures reliability during resonant capacitor faults.
Industrial AC/DC Adapter	LED Driver Flyback Converter
Use Scenario: 750W industrial adapter with universal AC input (90–264VAC) and active PFC + LLC dual-stage architecture. IC Role / Device Role / Timing Role: PFC switch subjected to 100% load step transients and line surges up to 350VAC. Use Value: 800V BVDSS derating and 100 V/ns dv/dt ruggedness prevent false turn-on during surge events; TO-252 thermal performance sustains 125°C case temperature.	Use Scenario: Primary switch in 150W constant-current LED driver flyback topology with 400V DC link. IC Role / Device Role / Timing Role: Hard-switched main transistor cycling at 65kHz; body diode recirculates leakage inductance energy. Use Value: Low R_DS(ON) improves efficiency at light loads; enhanced body diode withstands repetitive 16.5A I_RM peaks without degradation.

Server Power Supply PFC Stage

Gaming PSU LLC Resonant Converter

Use Scenario: Active clamp PFC boost stage operating at 65–100kHz with 380–400V DC bus in 1.5kW server silver box.

IC Role / Device Role / Timing Role: High-side switching element handling 10A RMS input current; synchronized to controller via gate driver.

Use Value: 0.78Ω R_DS(ON) limits conduction loss to <1.2W; 1.4mJ E_oss reduces turn-on loss by 35% vs. comparable 800V MOSFETs.

Use Scenario: Primary-side switch in asymmetric half-bridge LLC resonant converter powering GPU VRMs in high-end gaming PSUs.

IC Role / Device Role / Timing Role: ZVS-capable primary switch operating up to 350kHz; body diode conducts resonant current during dead time.

Use Value: 230ns t_rr and low Q_rr prevent voltage spikes and reduce EMI; 100% UIS rating ensures reliability during resonant capacitor faults.

Industrial AC/DC Adapter

LED Driver Flyback Converter

Use Scenario: 750W industrial adapter with universal AC input (90–264VAC) and active PFC + LLC dual-stage architecture.

IC Role / Device Role / Timing Role: PFC switch subjected to 100% load step transients and line surges up to 350VAC.

Use Value: 800V BVDSS derating and 100 V/ns dv/dt ruggedness prevent false turn-on during surge events; TO-252 thermal performance sustains 125°C case temperature.

Use Scenario: Primary switch in 150W constant-current LED driver flyback topology with 400V DC link.

IC Role / Device Role / Timing Role: Hard-switched main transistor cycling at 65kHz; body diode recirculates leakage inductance energy.

Use Value: Low R_DS(ON) improves efficiency at light loads; enhanced body diode withstands repetitive 16.5A I_RM peaks without degradation.

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	800V V_DSS, 0.85Ω R_DS(ON), 14nC Q_g, TO-220FP package	Higher R_DS(ON) and gate charge increase conduction and switching losses; through-hole mounting limits board density	Preferred where legacy TO-220 layout exists and thermal mass mitigates higher losses
IXFH30N65X2	650V V_DSS, 0.145Ω R_DS(ON), 32nC Q_g, TO-247 package	Lower voltage rating restricts use to 300V AC input systems; higher Q_g demands stronger gate drive	Selected when ultra-low R_DS(ON) dominates design priority and 650V rating suffices

Compared with STP7NK80ZFP and IXFH30N65X2, the AOD780A70 delivers optimal balance of 700V rating, DPAK thermal performance, and low-loss switching for next-gen compact power supplies - avoiding TO-220 layout constraints while offering higher voltage margin than 650V alternatives.

Availability

AOD780A70 is available at Aetrix Electronics and suitable for server power supply PFC stages, gaming PSU LLC resonant converters, and industrial AC/DC adapters requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AOD780A70 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 computing, consumer, and industrial markets.

The AOD780A70 belongs to AOS' aMOS5™ high-voltage MOSFET product line, engineered specifically for high-frequency, high-efficiency AC/DC conversion in space-constrained power supplies where thermal density and EMI control are critical.

FAQ

What is the maximum junction temperature rating for the AOD780A70?

The AOD780A70 has a maximum junction temperature (T_J) rating of 150°C, validated under continuous operation with proper heatsinking. This rating is used to calculate safe operating area limits and thermal de-rating curves - for example, power dissipation must be reduced linearly above 25°C case temperature per the 1.5°C/W R_θJC specification. The AOD780A70 maintains stable R_DS(ON) and avalanche performance up to this limit.

Does the AOD780A70 support ZVS operation in LLC resonant converters?

Yes, the AOD780A70 supports ZVS operation due to its low output capacitance energy (E_oss = 1.4mJ at 400V) and optimized C_oss profile (Co(er) = 16.5pF). These characteristics minimize turn-on switching loss and enable reliable zero-voltage switching in LLC topologies operating up to 350kHz. The AOD780A70's 230ns body-diode t_rr further ensures clean resonant current commutation during dead-time intervals.

Is the AOD780A70 pin-compatible with AOI780A70?

No, the AOD780A70 (TO-252/DPAK) and AOI780A70 (TO-251/IPAK) are not pin-compatible despite identical electrical specifications. Their packages differ mechanically: AOD780A70 uses a 3-lead surface-mount DPAK with exposed drain pad, while AOI780A70 uses a 3-lead IPAK with isolated drain tab. PCB layout, thermal pad design, and solder reflow profiles must be redesigned when substituting between AOD780A70 and AOI780A70.

What is the significance of 100% Rg testing for the AOD780A70?

100% R_g (gate resistance) testing on every AOD780A70 unit ensures tight distribution of internal gate resistance (3.1Ω typ) across production lots. This guarantees consistent gate drive timing, predictable Miller plateau duration, and repeatable switching waveforms - critical for EMI control and multi-phase synchronization in high-density power supplies. The AOD780A70's verified R_g eliminates need for external gate resistors in many designs.

Can the AOD780A70 replace older 800V MOSFETs in existing PFC designs?

The AOD780A70 can replace older 800V MOSFETs only if the design operates within its 700V V_DSS rating and accounts for differences in gate charge (11.5nC), R_DS(ON) (0.78Ω max), and thermal resistance (R_θJC = 1.5°C/W). While its 800V BVDSS test level provides margin, sustained operation above 700V violates absolute maximum ratings. The AOD780A70's improved body-diode recovery and lower E_oss may enhance efficiency but require gate driver validation.

AOD780A70 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: AlphaSGT™

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

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):: 83W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-252 (DPAK)

AOD780A70 FAQ

1.How can I place an order for AOD780A70 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOD780A70 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 AOD780A70 reliable?

The price and inventory of AOD780A70 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOD780A70 is usually 5 days.

3.What payment methods are accepted for AOD780A70?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOD780A70 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOD780A70?

AOD780A70 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOD780A70 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 AOD780A70?

For technical support, including AOD780A70 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOD780A70 requirements.

6.How does Aetrix verify that AOD780A70 is sourced from the original manufacturer or authorized distributors?

All AOD780A70 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 AOD780A70 meets industry standards.

7.What is the process for return or replacement of AOD780A70?

All AOD780A70 units undergo pre-shipment inspection (PSI). If there is an issue with AOD780A70, 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 AOD780A70 part is unused and in its original packaging.

Return procedure for AOD780A70:

1.Submit a request within 90 days.

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

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