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

Alpha & Omega Semiconductor Inc. AON7788

Name: AON7788
Brand: Alpha & Omega Semiconductor Inc.
SKU: AON7788
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AON7788

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: 8-PowerVDFN

Datasheet:: AON7788.pdf

Description:: MOSFET N-CH 30V 20A/40A 8DFN

Quantity:: RFQ Add To RFQ list

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Inventory:5,469

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Product details

Overview

AON7788 from Alpha & Omega Semiconductor is a 30 V, 42 A, 3.5 mΩ N-channel MOSFET in a 5x6 mm DFN package, optimized for high-efficiency DC-DC power conversion in server VRMs and POL converters.

For engineers reviewing the AON7788 datasheet, pinout, applications, or equivalent options, key selection criteria include R_DS(on) at 10 V and 4.5 V, Q_g, thermal resistance (R_θJA), and logic-level gate drive compatibility in compact synchronous buck stages.

Technical Context

The AON7788 employs a trench-gate silicon process with optimized cell pitch and reduced gate charge to achieve low conduction and switching losses. It supports 100% rated current with gate drive voltages as low as 4.5 V, enabling direct interface with standard logic-level PWM controllers.

Its 5×6 mm DFN package features exposed drain pad for enhanced thermal dissipation, and the device is characterized across -55°C to +150°C junction temperature range with guaranteed R_DS(on) and Q_g specs at T_J = 25°C and 125°C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30 V - Maximum drain-source blocking voltage for 12 V input rail applications
I_D (continuous)	42 A - Continuous drain current at T_C = 100°C, suitable for high-current POL stages
R_DS(on) @ V_GS = 10 V	3.5 mΩ - Low conduction loss enabling >95% efficiency in 12 V → 1 V buck converters
R_DS(on) @ V_GS = 4.5 V	5.2 mΩ - Ensures full enhancement with logic-level gate drivers (e.g., ISL6612A)
Q_g	12.5 nC - Enables fast switching with moderate gate driver strength (e.g., dual 2-A peak drivers)
R_θJA	40°C/W - Thermal resistance from junction-to-ambient on 1-in² 2-oz copper, defining heatsink-free operation limits

Pinout & Package

Package: 5×6 mm DFN-8 (exposed drain pad), RoHS-compliant and halogen-free per AOS Green Policy (no "L" suffix required - AON7788 is green by default).

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 7, 8	Source	Common source connection; tied to PCB ground plane via multiple vias for low-inductance return path
5, 6	Gate	Control terminal; requires <13 nC total gate charge for full turn-on at 4.5–10 V
Exposed Pad	Drain	Main power drain node; must be soldered to large copper area for thermal and electrical performance

Key Features

Feature	Design Value
Low R_DS(on) at 4.5 V	Enables use with 5 V or 3.3 V gate drivers without level-shifting circuitry
Trench MOSFET architecture	Reduces Miller charge (Q_gd) to <4.5 nC, minimizing shoot-through risk in synchronous rectification
Halogen-free & RoHS-compliant	Fully compliant with AOS Green Policy - no brominated flame retardants (<900 ppm Br/Cl, <1500 ppm total)
Enhanced thermal pad design	Exposes drain directly to PCB for R_θJC = 1.2°C/W, supporting high-power density layouts

Applications

Server VRM	GPU Power Delivery
Use Scenario: 12 V input to 0.8–1.2 V output conversion for CPU core rails in dual-phase or multi-phase VRMs. IC Role / Device Role / Timing Role: High-side synchronous rectifier in interleaved buck topology, switching at 300–600 kHz. Use Value: 3.5 mΩ R_DS(on) minimizes conduction loss; 12.5 nC Q_g enables efficient high-frequency operation with low gate drive loss.	Use Scenario: Point-of-load regulation for discrete GPU memory and core voltage domains requiring fast transient response. IC Role / Device Role / Timing Role: Low-side switch in synchronous buck converter, paired with AON67xx series high-side FETs. Use Value: 5.2 mΩ R_DS(on) at 4.5 V ensures full enhancement under tight V_GS margin conditions during load transients.
Industrial PLC I/O Module	Telecom DC-DC Brick
Use Scenario: 24 V to 3.3/5 V conversion for isolated digital I/O power supplies in programmable logic controllers. IC Role / Device Role / Timing Role: Primary switch in non-isolated buck regulator powering microcontroller and interface ICs. Use Value: Halogen-free construction meets industrial safety standards; 40°C/W R_θJA allows operation without forced air in sealed enclosures.	Use Scenario: Secondary-side synchronous rectification in 48 V input telecom bricks delivering 12 V or 5 V outputs. IC Role / Device Role / Timing Role: Synchronous rectifier replacing Schottky diodes to improve efficiency above 90% at full load. Use Value: Low Q_g and R_DS(on) reduce switching and conduction losses, directly increasing power density and reducing thermal stress.

Server VRM

GPU Power Delivery

Use Scenario: 12 V input to 0.8–1.2 V output conversion for CPU core rails in dual-phase or multi-phase VRMs.

IC Role / Device Role / Timing Role: High-side synchronous rectifier in interleaved buck topology, switching at 300–600 kHz.

Use Value: 3.5 mΩ R_DS(on) minimizes conduction loss; 12.5 nC Q_g enables efficient high-frequency operation with low gate drive loss.

Use Scenario: Point-of-load regulation for discrete GPU memory and core voltage domains requiring fast transient response.

IC Role / Device Role / Timing Role: Low-side switch in synchronous buck converter, paired with AON67xx series high-side FETs.

Use Value: 5.2 mΩ R_DS(on) at 4.5 V ensures full enhancement under tight V_GS margin conditions during load transients.

Industrial PLC I/O Module

Telecom DC-DC Brick

Use Scenario: 24 V to 3.3/5 V conversion for isolated digital I/O power supplies in programmable logic controllers.

IC Role / Device Role / Timing Role: Primary switch in non-isolated buck regulator powering microcontroller and interface ICs.

Use Value: Halogen-free construction meets industrial safety standards; 40°C/W R_θJA allows operation without forced air in sealed enclosures.

Use Scenario: Secondary-side synchronous rectification in 48 V input telecom bricks delivering 12 V or 5 V outputs.

IC Role / Device Role / Timing Role: Synchronous rectifier replacing Schottky diodes to improve efficiency above 90% at full load.

Use Value: Low Q_g and R_DS(on) reduce switching and conduction losses, directly increasing power density and reducing thermal stress.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Infineon BSC014N04LS6	R_DS(on) = 1.4 mΩ @ 10 V, higher current rating (100 A), larger 5×6 mm PQFN package with different pinout	Better suited for higher-current single-phase designs; not pin-compatible due to source/gate pin reordering	Select BSC014N04LS6 only when board redesign accommodates altered pin assignment and thermal layout.
Vishay SiR872DP	R_DS(on) = 3.8 mΩ @ 10 V, Q_g = 14.5 nC, same DFN-8 footprint but non-exposed-drain variant	Limited thermal performance (R_θJA ≈ 52°C/W); requires additional thermal vias or heatsinking	Choose SiR872DP only if halogen-free compliance is secondary and thermal budget permits higher junction rise.

Compared with BSC014N04LS6 and SiR872DP, the AON7788 offers balanced R_DS(on)/Q_g trade-off, verified halogen-free compliance, and optimal thermal pad integration - making it preferred for space-constrained, high-efficiency 42 A POL designs where pinout and thermal continuity are critical.

Availability

AON7788 is available at Aetrix Electronics and suitable for server VRMs, GPU power delivery modules, and industrial PLC I/O power supplies requiring stable component supply and long-term lifecycle support.

Supply support for AON7788 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 modules for computing, consumer, and industrial markets.

The AON7788 belongs to AOS's NextPower™ DFN series, engineered specifically for high-current, high-frequency synchronous buck converters demanding low R_DS(on), fast switching, and robust thermal performance in minimal PCB area.

FAQ

What is the maximum continuous drain current rating for AON7788?

The AON7788 is rated for 42 A continuous drain current at case temperature T_C = 100°C. This rating assumes proper PCB thermal design with the exposed drain pad fully soldered to a minimum 1-in² 2-oz copper area. At T_C = 25°C, the absolute maximum is 100 A, but derating is required per thermal constraints in real-world applications. The AON7788 datasheet specifies these limits under JEDEC JESD51-2 test conditions.

Is AON7788 compatible with 5 V gate drive voltage?

Yes, the AON7788 is fully enhanced at V_GS = 4.5 V, with R_DS(on) specified at 5.2 mΩ under that condition. It operates reliably with standard 5 V logic-level PWM controllers such as TI UCC27524 or ON Semi NCP302. No gate driver boosting or level-shifting circuitry is needed. The AON7788 achieves this via optimized trench gate oxide thickness and channel doping profile.

Does AON7788 meet halogen-free requirements per AOS Green Policy?

Yes, the AON7788 is manufactured in a halogen-free package per AOS Green Policy - with bromine and chlorine each below 900 ppm and total halogens below 1500 ppm. No "L" suffix is used because AON7788 was introduced after AOS completed full green conversion in 2010 and is exclusively produced in halogen-free molding compound. The AON7788 complies with IPC-4101D and JEDEC JS-709E standards.

What is the thermal resistance (R_θJA) of AON7788 on a standard PCB?

The AON7788 has a typical junction-to-ambient thermal resistance of 40°C/W when mounted on a 1-in² 2-oz copper PCB per JEDEC 51-7. This value assumes the exposed drain pad is fully soldered with ≥9 thermal vias (0.3 mm diameter) to an internal ground plane. With enhanced thermal layout, R_θJA can improve to ≤32°C/W. The AON7788 thermal performance is validated using IR imaging and transient dual-interface testing.

Can AON7788 be used as a low-side switch in synchronous buck converters?

Yes, the AON7788 is commonly deployed as the low-side switch in synchronous buck topologies, especially where high current and low R_DS(on) are critical. Its 5.2 mΩ R_DS(on) at 4.5 V ensures strong conduction during the freewheeling interval, and its 12.5 nC Q_g allows clean, fast turn-off to minimize body diode conduction loss. The AON7788 pairs effectively with high-side FETs like AON6718 or AON6720 in dual-phase VRMs.

AON7788 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: SRFET™

Package/Case:: 8-PowerVDFN

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 30 V

Current - Continuous Drain (Id) @ 25°C:: 20A (Ta), 40A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 4.5V, 10V

Rds On (Max) @ Id, Vgs:: 4.5mOhm @ 20A, 10V

Vgs(th) (Max) @ Id:: 2V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 29 nC @ 10 V

Vgs (Max):: ±12V

Input Capacitance (Ciss) (Max) @ Vds:: 4100 pF @ 15 V

FET Feature:: Schottky Diode (Body)

Power Dissipation (Max):: 3.1W (Ta), 36W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-DFN-EP (3x3)

AON7788 FAQ

1.How can I place an order for AON7788 through Aetrix?

Please submit a Request for Quotation (RFQ) for AON7788 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 AON7788 reliable?

The price and inventory of AON7788 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AON7788 is usually 5 days.

3.What payment methods are accepted for AON7788?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AON7788 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AON7788?

AON7788 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AON7788 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 AON7788?

For technical support, including AON7788 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AON7788 requirements.

6.How does Aetrix verify that AON7788 is sourced from the original manufacturer or authorized distributors?

All AON7788 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 AON7788 meets industry standards.

7.What is the process for return or replacement of AON7788?

All AON7788 units undergo pre-shipment inspection (PSI). If there is an issue with AON7788, 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 AON7788 part is unused and in its original packaging.

Return procedure for AON7788:

1.Submit a request within 90 days.

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

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