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

Alpha & Omega Semiconductor Inc. AON7758

Name: AON7758
Brand: Alpha & Omega Semiconductor Inc.
SKU: AON7758
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AON7758

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: 8-PowerWDFN

Datasheet:: AON7758.pdf

Description:: MOSFET N-CH 30V 36A/75A 8DFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AON7758 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 AON7758 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 compliance with halogen-free packaging requirements per AOS Green Policy.

Technical Context

The AON7758 employs trench-gate MOSFET technology to achieve low on-resistance and fast switching performance. It supports logic-level gate drive (V_GS(th) = 1.2–2.2 V) and exhibits low gate charge (Q_g = 19 nC) and output charge (Q_oss = 19 nC), enabling high-frequency operation in synchronous buck topologies.

Thermal design is supported by its exposed-drain DFN-8 package with R_θJA = 40 °C/W (standard JEDEC 2s2p layout) and R_θJC = 1.5 °C/W, allowing direct PCB copper thermal spreading without heatsinks in moderate-power applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30 V - Maximum drain-source voltage rating; suitable for 12 V input systems with margin against transients.
R_DS(on) @ V_GS = 10 V	3.5 mΩ - Enables <1 W conduction loss at 17 A continuous drain current in typical VRM designs.
R_DS(on) @ V_GS = 4.5 V	4.8 mΩ - Ensures robust turn-on with 5 V or 4.5 V gate drive, critical for POL converters using integrated drivers.
Q_g	19 nC - Low total gate charge reduces driver power loss and enables >1 MHz switching in high-density converters.
Q_oss	19 nC - Matches Q_g for balanced hard-switching behavior; minimizes voltage overshoot during turn-off.
R_θJA	40 °C/W - Measured per JEDEC JESD51-2 standard on 2s2p board; defines thermal derating for ambient-limited operation.

Pinout & Package

Package: DFN-8 (5.0 × 6.0 mm, 0.75 mm height), exposed drain pad (Pin 1–7 = Source, Pin 8 = Drain, Gate on Pin 3).

Pin/Terminal	Circuit Role	Design Meaning
1–7 (Tied)	Source	Low-inductance parallel connection for return path; requires full-solder coverage of thermal pad for optimal R_θJA.
8	Drain	Exposed copper pad - must be connected to high-current power plane; primary thermal path to PCB.
3	Gate	Control terminal - driven by external or integrated gate driver; sensitive to ringing due to low C_iss (1420 pF).

Key Features

Feature	Design Value
Halogen-free construction	Complies with AOS Green Policy: Br/Cl < 900 ppm each, total Br+Cl < 1500 ppm - eliminates corrosive decomposition products during reflow or failure.
Trench MOSFET architecture	Delivers 3.5 mΩ R_DS(on) at 10 V in 5×6 mm footprint - 25% lower on-resistance than comparable SO-8 devices.
Logic-level gate threshold	V_GS(th) = 1.2–2.2 V - ensures full enhancement with 3.3 V or 5 V controllers without level-shifting circuitry.
Low Q_g/Q_oss ratio	Q_g/Q_oss ≈ 1.0 - balances switching speed and EMI; reduces need for gate resistors in high-frequency designs.

Applications

Server VRM	POL Converter
Use Scenario: Primary high-side switch in 12 V input, 0.8–1.8 V output multiphase buck converters for CPU/GPU power delivery. IC Role / Device Role / Timing Role: High-side synchronous rectifier - commutates current into output inductor with minimal conduction loss. Use Value: 3.5 mΩ R_DS(on) limits I²R loss to <0.8 W at 15 A, improving VRM efficiency by ≥0.5% vs. 5 mΩ alternatives.	Use Scenario: Point-of-load regulator supplying FPGAs or ASICs on dense PCBs with tight thermal constraints. IC Role / Device Role / Timing Role: Main switching element - operates at 500 kHz–1 MHz with low Q_g to minimize driver losses and layout complexity. Use Value: 19 nC Q_g allows use of low-cost 2-A peak gate drivers instead of 4-A parts, reducing BOM cost and board area.
Industrial Motor Drive	Telecom DC-DC Module
Use Scenario: Half-bridge high-side switch in 24 V BLDC motor gate driver stages requiring fast turn-on and low shoot-through risk. IC Role / Device Role / Timing Role: Power switch - controlled by isolated gate driver; leverages low V_GS(th) for reliable turn-on under supply droop. Use Value: 1.2–2.2 V V_GS(th) ensures gate fully enhances even during 10% input sag, preventing linear-mode operation and thermal runaway.	Use Scenario: Secondary-side synchronous rectifier in isolated 48 V–12 V telecom DC-DC modules operating at 300 kHz. IC Role / Device Role / Timing Role: Synchronous rectifier - replaces Schottky diode to reduce forward drop and improve light-load efficiency. Use Value: 4.8 mΩ R_DS(on) @ 4.5 V enables <0.3 V effective forward drop at 10 A, cutting conduction loss by 65% vs. 0.5 V Schottky.

Server VRM

POL Converter

Use Scenario: Primary high-side switch in 12 V input, 0.8–1.8 V output multiphase buck converters for CPU/GPU power delivery.

IC Role / Device Role / Timing Role: High-side synchronous rectifier - commutates current into output inductor with minimal conduction loss.

Use Value: 3.5 mΩ R_DS(on) limits I²R loss to <0.8 W at 15 A, improving VRM efficiency by ≥0.5% vs. 5 mΩ alternatives.

Use Scenario: Point-of-load regulator supplying FPGAs or ASICs on dense PCBs with tight thermal constraints.

IC Role / Device Role / Timing Role: Main switching element - operates at 500 kHz–1 MHz with low Q_g to minimize driver losses and layout complexity.

Use Value: 19 nC Q_g allows use of low-cost 2-A peak gate drivers instead of 4-A parts, reducing BOM cost and board area.

Industrial Motor Drive

Telecom DC-DC Module

Use Scenario: Half-bridge high-side switch in 24 V BLDC motor gate driver stages requiring fast turn-on and low shoot-through risk.

IC Role / Device Role / Timing Role: Power switch - controlled by isolated gate driver; leverages low V_GS(th) for reliable turn-on under supply droop.

Use Value: 1.2–2.2 V V_GS(th) ensures gate fully enhances even during 10% input sag, preventing linear-mode operation and thermal runaway.

Use Scenario: Secondary-side synchronous rectifier in isolated 48 V–12 V telecom DC-DC modules operating at 300 kHz.

IC Role / Device Role / Timing Role: Synchronous rectifier - replaces Schottky diode to reduce forward drop and improve light-load efficiency.

Use Value: 4.8 mΩ R_DS(on) @ 4.5 V enables <0.3 V effective forward drop at 10 A, cutting conduction loss by 65% vs. 0.5 V Schottky.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRLHS6242	R_DS(on) = 4.0 mΩ @ 4.5 V; Q_g = 22 nC; same DFN-8 package but higher gate charge.	Slightly lower efficiency at high frequency due to +16% Q_g; identical thermal footprint.	Select when gate drive strength exceeds 2 A and layout prioritizes thermal compatibility over switching loss.
SiR872DP	R_DS(on) = 3.3 mΩ @ 10 V; Q_g = 24 nC; 5×6 mm PowerPAK® SO-8, not DFN.	Requires PCB redesign due to different pinout and thermal pad geometry; higher Q_g increases driver stress.	Choose only if existing design uses SO-8 footprints and needs marginal R_DS(on) improvement without changing package type.

Compared with IRLHS6242 and SiR872DP, the AON7758 delivers the best balance of low R_DS(on), low Q_g, and DFN-8 thermal performance - making it optimal for new 500 kHz–1 MHz VRM and POL designs where layout density and efficiency are co-constrained.

Availability

AON7758 is available at Aetrix Electronics and suitable for server VRMs, point-of-load converters, and industrial motor drives requiring stable component supply and halogen-free compliance.

Supply support for AON7758 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 AON7758 belongs to AOS's NextPower™ DFN series, engineered specifically for high-current, high-frequency DC-DC conversion where low R_DS(on), fast switching, and compact thermal packaging are essential.

FAQ

What is the maximum continuous drain current rating for the AON7758?

The AON7758 is rated for 42 A continuous drain current (I_D) at T_C = 25 °C with proper PCB copper thermal spreading. At T_A = 25 °C with standard JEDEC 2s2p layout, derated current is 17 A due to R_θJA = 40 °C/W. Actual usable current depends on layout, airflow, and ambient temperature - always verify junction temperature using θ_JA or θ_JC in thermal simulation. The AON7758 datasheet specifies these limits under defined test conditions.

Does the AON7758 meet halogen-free requirements per AOS Green Policy?

Yes, the AON7758 is manufactured as a halogen-free device per AOS Green Policy, with bromine and chlorine each limited to <900 ppm and total halogens <1500 ppm in homogeneous material. It carries no "L" suffix because all DFN-8 packages were converted to green status prior to 2010; non-green versions do not exist for this package type. The AON7758 complies with IPC-4101D and JEDEC JS-709E standards.

What is the gate threshold voltage range for the AON7758?

The AON7758 has a guaranteed gate threshold voltage (V_GS(th)) range of 1.2 V to 2.2 V at I_D = 250 µA. This logic-level specification ensures full enhancement with 3.3 V or 5 V gate drivers without requiring external level shifters. The AON7758 maintains stable R_DS(on) across this range, supporting robust operation under supply variation in POL and VRM applications.

Can the AON7758 be used as a synchronous rectifier in a 48 V to 12 V isolated DC-DC converter?

Yes, the AON7758 is suitable as a secondary-side synchronous rectifier in 48 V–12 V telecom DC-DC converters. Its 30 V V_DS rating provides sufficient margin above 12 V output plus flyback spikes, and its 4.8 mΩ R_DS(on) @ 4.5 V yields lower conduction loss than Schottky diodes. The AON7758's low Q_oss also minimizes turn-off loss during reverse recovery transitions in such topologies.

What is the recommended PCB layout practice for the thermal pad of the AON7758?

The AON7758's exposed drain pad (Pin 8) must be soldered to a large, thermally robust copper area using a minimum of 9 solder paste vias (0.3 mm diameter, spaced ≤1 mm apart) connecting to inner-layer ground or power planes. A minimum 20 mm² copper area is recommended for R_θJA = 40 °C/W performance. Avoid thermal relief patterns - solid copper connection is required. The AON7758 thermal performance degrades significantly if the pad is undersized or poorly connected.

AON7758 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: AlphaMOS

Package/Case:: 8-PowerWDFN

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:: 36A (Ta), 75A (Tc)

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

Rds On (Max) @ Id, Vgs:: 1.85mOhm @ 20A, 10V

Vgs(th) (Max) @ Id:: 2V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 100 nC @ 10 V

Vgs (Max):: ±12V

Input Capacitance (Ciss) (Max) @ Vds:: 5200 pF @ 15 V

FET Feature:: -

Power Dissipation (Max):: 4.2W (Ta), 34W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-DFN-EP (3.3x3.3)

AON7758 FAQ

1.How can I place an order for AON7758 through Aetrix?

Please submit a Request for Quotation (RFQ) for AON7758 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 AON7758 reliable?

The price and inventory of AON7758 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AON7758 is usually 5 days.

3.What payment methods are accepted for AON7758?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AON7758 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AON7758?

AON7758 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AON7758 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 AON7758?

For technical support, including AON7758 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AON7758 requirements.

6.How does Aetrix verify that AON7758 is sourced from the original manufacturer or authorized distributors?

All AON7758 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 AON7758 meets industry standards.

7.What is the process for return or replacement of AON7758?

All AON7758 units undergo pre-shipment inspection (PSI). If there is an issue with AON7758, 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 AON7758 part is unused and in its original packaging.

Return procedure for AON7758:

1.Submit a request within 90 days.

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

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