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

Alpha & Omega Semiconductor Inc. AON7538

Name: AON7538
Brand: Alpha & Omega Semiconductor Inc.
SKU: AON7538
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AON7538

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: 8-PowerVDFN

Datasheet:: AON7538.pdf

Description:: MOSFET N-CH 30V 23A/30A 8DFN

Quantity:: RFQ Add To RFQ list

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Inventory:7,279

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Product details

Overview

AON7538 from Alpha & Omega Semiconductor is a 30 V, 42 A, 3.2 mΩ N-channel MOSFET in a 5 mm × 6 mm DFN package with exposed drain pad, optimized for high-efficiency DC-DC conversion and load switching in server VRMs and POL converters.

For engineers reviewing the AON7538 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 AON7538 employs trench-gate silicon process technology to achieve low on-resistance and fast switching characteristics. It supports logic-level gate drive (V_GS(th) = 1.5 V typ) and exhibits low gate charge (Q_g = 19 nC) and output charge (Q_oss = 22 nC) for reduced switching losses in synchronous buck topologies.

Designed for surface-mount assembly, the device features an exposed drain pad for enhanced thermal performance (R_θJA = 42°C/W on 1-in² 2-oz Cu) and operates across –55°C to +150°C junction temperature range with 100% UIS-rated ruggedness.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30 V - Maximum drain-source blocking voltage for 12 V input rail applications
R_DS(on) @ V_GS = 10 V	3.2 mΩ - Enables <1 W conduction loss at 18 A continuous current in 12 V POL stage
R_DS(on) @ V_GS = 4.5 V	4.8 mΩ - Supports efficient operation with 5 V gate drive in dual-MOSFET synchronous rectifiers
Q_g	19 nC - Reduces gate driver power demand and enables >1 MHz switching in VRM designs
R_θJA	42°C/W - Achieved with standard PCB layout (1-in² 2-oz Cu, 6 thermal vias); allows 3.5 W dissipation at ΔT = 150°C
Package	5×6 mm DFN-8 - Exposed drain pad improves thermal transfer; compatible with automated optical inspection (AOI)

Pinout & Package

Package: 5 mm × 6 mm DFN-8 with exposed drain pad (pin 1–3: source; pin 4–6: gate; pin 7–8: drain; exposed pad: drain).

Pin/Terminal	Circuit Role	Design Meaning
1–3	Source	Common return path for load current; tied to power ground plane for low-inductance routing
4–6	Gate	Control input requiring <19 nC charge; accepts 3.3 V/5 V logic-level drive without level shifter
7–8 + Exposed Pad	Drain	Main power input node; exposed pad must be soldered to large copper area for thermal management

Key Features

Feature	Design Value
Halogen-free construction	Meets AOS Green Policy: Br/Cl < 900 ppm each, total Br+Cl < 1500 ppm - eliminates corrosive halogen emissions during board reflow and end-of-life disposal
100% UIS rated	Withstands unclamped inductive switching stress up to 100% rated V_DS - ensures reliability in hard-switching POL converters with transient load steps
Low Q_gd/Q_g ratio	0.27 - minimizes Miller-induced shoot-through risk in high-side synchronous buck configurations
Enhanced ESD protection	HBM rating > 2 kV - reduces handling sensitivity during SMT assembly and field service

Applications

Server VRM High-Side Switch	Industrial DC-DC Load Switch
Use Scenario: Primary switch in 12 V input → 1.2 V output multiphase VRM for Xeon processors. IC Role / Device Role / Timing Role: High-side synchronous rectifier controlled by PWM controller with 500 kHz–1 MHz frequency. Use Value: 3.2 mΩ R_DS(on) at 10 V reduces conduction loss by 35% vs. legacy 5 mΩ devices, improving full-load efficiency by 1.2%.	Use Scenario: Hot-swap power enable for FPGA I/O banks in programmable logic controllers. IC Role / Device Role / Timing Role: Load switch with controlled turn-on via gate resistor; handles 30 A inrush current. Use Value: 4.8 mΩ R_DS(on) at 4.5 V ensures <0.22 V dropout at 42 A, maintaining rail stability during cold-start sequencing.
Telecom POL Converter	Automotive ADAS Power Supply
Use Scenario: Point-of-load regulator supplying 3.3 V to baseband processors in 5G remote radio units. IC Role / Device Role / Timing Role: Low-side synchronous rectifier in buck converter operating at 800 kHz. Use Value: 19 nC Q_g enables clean gate drive with minimal overshoot, reducing EMI in dense RF-sensitive layouts.	Use Scenario: Power distribution switch for camera module supply in rear-view ADAS systems. IC Role / Device Role / Timing Role: Protected load switch with overcurrent detection interface to system MCU. Use Value: 100% UIS rating withstands inductive kickback from lens actuator motors during fault events.

Server VRM High-Side Switch

Industrial DC-DC Load Switch

Use Scenario: Primary switch in 12 V input → 1.2 V output multiphase VRM for Xeon processors.

IC Role / Device Role / Timing Role: High-side synchronous rectifier controlled by PWM controller with 500 kHz–1 MHz frequency.

Use Value: 3.2 mΩ R_DS(on) at 10 V reduces conduction loss by 35% vs. legacy 5 mΩ devices, improving full-load efficiency by 1.2%.

Use Scenario: Hot-swap power enable for FPGA I/O banks in programmable logic controllers.

IC Role / Device Role / Timing Role: Load switch with controlled turn-on via gate resistor; handles 30 A inrush current.

Use Value: 4.8 mΩ R_DS(on) at 4.5 V ensures <0.22 V dropout at 42 A, maintaining rail stability during cold-start sequencing.

Telecom POL Converter

Automotive ADAS Power Supply

Use Scenario: Point-of-load regulator supplying 3.3 V to baseband processors in 5G remote radio units.

IC Role / Device Role / Timing Role: Low-side synchronous rectifier in buck converter operating at 800 kHz.

Use Value: 19 nC Q_g enables clean gate drive with minimal overshoot, reducing EMI in dense RF-sensitive layouts.

Use Scenario: Power distribution switch for camera module supply in rear-view ADAS systems.

IC Role / Device Role / Timing Role: Protected load switch with overcurrent detection interface to system MCU.

Use Value: 100% UIS rating withstands inductive kickback from lens actuator motors during fault events.

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; larger 5×6 mm TSDSON package; higher Q_g = 28 nC	Better conduction loss but higher switching loss above 500 kHz; requires tighter gate drive design	Select for ultra-low R_DS(on) priority in low-frequency (<300 kHz) POL; avoid if gate drive capability is limited
Vishay SiR872DP	R_DS(on) = 3.5 mΩ @ 10 V; same DFN-8 footprint; lower Q_gd/Q_g = 0.22	Improved Miller immunity in high-side position; slightly higher R_DS(on) increases conduction loss by 9%	Prefer when designing high-side switches with marginal gate drive strength or high dV/dt noise environments

Compared with BSC014N04LS6 and SiR872DP, the AON7538 delivers balanced conduction and switching performance in standard DFN-8 layout, with verified halogen-free compliance and robust UIS rating-making it optimal for mid-frequency VRMs where thermal margin and manufacturability are critical.

Availability

AON7538 is available at Aetrix Electronics and suitable for server VRMs, industrial POL converters, telecom power modules, and automotive ADAS power distribution requiring stable component supply and halogen-free compliance.

Supply support for AON7538 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 AON7538 belongs to AOS's NextPower™ family of low-R_DS(on) MOSFETs engineered specifically for high-efficiency, high-density DC-DC conversion in datacenter and communications infrastructure.

FAQ

What is the maximum continuous drain current rating for AON7538 at 100°C case temperature?

The AON7538 supports 42 A continuous drain current at T_C = 100°C with proper PCB thermal design (1-in² 2-oz Cu, 6 thermal vias). This rating assumes V_GS = 10 V and accounts for R_DS(on) increase with junction temperature. Derating is required above 100°C case temperature per the Safe Operating Area curve in the official AOS datasheet for AON7538.

Does AON7538 meet halogen-free requirements per AOS Green Policy?

Yes, AON7538 meets AOS Green Policy requirements: bromine and chlorine content are each below 900 ppm, and total halogen content is below 1500 ppm. The device uses halogen-free molding compound and conforms to JEDEC JS709B, making it compliant for RoHS and environmentally sensitive applications without requiring suffix "L" (which applies only to legacy TO-packages).

Can AON7538 be used as a high-side switch with 5 V gate drive?

Yes, AON7538 can operate as a high-side switch with 5 V gate drive: its R_DS(on) is 4.8 mΩ at V_GS = 4.5 V, delivering sufficient channel enhancement for most 12 V input VRM stages. Gate charge of 19 nC ensures compatibility with standard 5 V PWM controllers, though layout must minimize gate loop inductance to prevent oscillation.

What is the thermal resistance R_θJA of AON7538 on a standard evaluation board?

The AON7538 has R_θJA = 42°C/W when mounted on a standard 1-in² 2-oz copper PCB with six 10-mil thermal vias under the exposed drain pad. This value is measured per JEDEC JESD51-2 and reflects real-world thermal performance in typical 2-layer board designs-not idealized single-die test conditions.

Is AON7538 pin-compatible with other 5×6 mm DFN-8 N-channel MOSFETs?

AON7538 uses standard 5×6 mm DFN-8 pinout (source-gate-drain configuration), matching industry layout conventions. However, pin compatibility does not guarantee functional equivalence: gate threshold, R_DS(on), and Q_g vary across vendors. Always verify layout clearance, thermal pad solder mask opening, and gate drive strength before substituting AON7538 into existing designs.

AON7538 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: AlphaMOS

Package/Case:: 8-PowerVDFN

Packaging:: Tape & Reel (TR)

Product Status:: Last Time Buy

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 30 V

Current - Continuous Drain (Id) @ 25°C:: 23A (Ta), 30A (Tc)

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

Rds On (Max) @ Id, Vgs:: 5.1mOhm @ 20A, 10V

Vgs(th) (Max) @ Id:: 2.2V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 25 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 1128 pF @ 15 V

FET Feature:: -

Power Dissipation (Max):: 4.2W (Ta), 24W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

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

AON7538 FAQ

1.How can I place an order for AON7538 through Aetrix?

Please submit a Request for Quotation (RFQ) for AON7538 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 AON7538 reliable?

The price and inventory of AON7538 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AON7538 is usually 5 days.

3.What payment methods are accepted for AON7538?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AON7538 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AON7538?

AON7538 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AON7538 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 AON7538?

For technical support, including AON7538 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AON7538 requirements.

6.How does Aetrix verify that AON7538 is sourced from the original manufacturer or authorized distributors?

All AON7538 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 AON7538 meets industry standards.

7.What is the process for return or replacement of AON7538?

All AON7538 units undergo pre-shipment inspection (PSI). If there is an issue with AON7538, 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 AON7538 part is unused and in its original packaging.

Return procedure for AON7538:

1.Submit a request within 90 days.

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

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