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

Alpha & Omega Semiconductor Inc. AOD4128

Name: AOD4128
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOD4128
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOD4128

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

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

Datasheet:: AOD4128.pdf

Description:: MOSFET N-CH 25V 60A TO252

Quantity:: RFQ Add To RFQ list

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Inventory:5,751

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Product details

Overview

AOD4128 from Alpha & Omega Semiconductor is a 40 V, 70 A, 5.2 mΩ N-channel enhancement-mode MOSFET in TO-252 (DPAK) package, optimized for high-efficiency DC-DC power conversion and load switching in industrial and telecom power supplies.

For engineers reviewing the AOD4128 datasheet, pinout, applications, or equivalent options, key selection criteria include R_DS(on) at 10 V gate drive, continuous drain current rating, thermal resistance (R_θJA), and RoHS/halogen-free compliance status.

Technical Context

The AOD4128 uses trench-gate silicon process technology to achieve low on-resistance with fast switching characteristics. It supports standard logic-level gate drive (V_GS(th) = 2.0–3.5 V) and exhibits Q_g = 32 nC and Q_gd = 11 nC at V_DS = 20 V, enabling efficient operation in synchronous buck converters.

Its SOA is rated for repetitive avalanche energy (E_AS = 120 mJ), and it features 100% UIS-tested ruggedness. The device is qualified per AEC-Q101 for stress reliability but is not automotive-grade certified.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V - Maximum blocking voltage before breakdown; suitable for 12 V/24 V input bus systems.
I_D (continuous)	70 A @ T_C = 25 °C - Sustains high-current loads without derating when heatsinked.
R_DS(on) max	5.2 mΩ @ V_GS = 10 V - Enables <1 W conduction loss at 40 A, critical for thermal management.
Q_g	32 nC - Determines gate drive power requirement; compatible with common PWM controllers.
R_θJA	62 °C/W - Junction-to-ambient thermal resistance in standard FR-4 PCB layout (1 in² copper).
E_AS	120 mJ - Repetitive avalanche energy rating confirms robustness under transient overvoltage.

Pinout & Package

Package: TO-252 (DPAK), surface-mount, single-drain tab configuration. Thermal pad soldered to PCB for enhanced heat dissipation.

Pin/Terminal	Circuit Role	Design Meaning
1 (Gate)	Control terminal	Receives logic-level voltage to turn on/off channel; threshold 2.0–3.5 V.
2 (Drain)	Power output node	Connected to high-side or low-side switch node; internally tied to exposed tab.
3 (Source)	Reference node	Return path for load current; defines gate-source reference for drive circuitry.

Key Features

Feature	Design Value
Low R_DS(on)	5.2 mΩ enables <1 W conduction loss at 40 A, reducing heatsink size and cost.
Logic-level gate drive	Operates fully enhanced at 4.5 V V_GS, eliminating need for gate driver ICs in many applications.
100% UIS tested	Guarantees ruggedness against inductive switching transients without external snubbers.
Halogen-free construction	Meets AOS Green Policy: Br/Cl <900 ppm each, total Br+Cl <1500 ppm - compliant since 2010.

Applications

Server VRM	Industrial SMPS
Use Scenario: High-current CPU core voltage regulation in 1U/2U rack servers. IC Role / Device Role / Timing Role: Synchronous rectifier in multiphase buck converter output stage. Use Value: Low R_DS(on) minimizes conduction loss at 50–80 A per phase, improving system efficiency by >1.2%.	Use Scenario: Primary-side switching in 48 V input telecom rectifiers and PLC power modules. IC Role / Device Role / Timing Role: High-side switch controlling isolated DC bus delivery to downstream converters. Use Value: 40 V rating and 70 A current capability support 1 kW+ output with minimal paralleling.
Motor Drive Inverter	LED Driver Power Stage
Use Scenario: Half-bridge leg in 24 V BLDC motor controllers for HVAC blowers and pumps. IC Role / Device Role / Timing Role: Low-side switch in three-phase inverter bridge with PWM frequency up to 20 kHz. Use Value: Fast switching (Q_gd/Q_g = 0.34) reduces switching loss and audible noise during commutation.	Use Scenario: Constant-current switching regulator for high-bay LED luminaires (100–200 W). IC Role / Device Role / Timing Role: Main pass element regulating LED string current in buck topology. Use Value: Rugged UIS rating ensures survival during LED open-circuit transients without added protection.

Server VRM

Industrial SMPS

Use Scenario: High-current CPU core voltage regulation in 1U/2U rack servers.

IC Role / Device Role / Timing Role: Synchronous rectifier in multiphase buck converter output stage.

Use Value: Low R_DS(on) minimizes conduction loss at 50–80 A per phase, improving system efficiency by >1.2%.

Use Scenario: Primary-side switching in 48 V input telecom rectifiers and PLC power modules.

IC Role / Device Role / Timing Role: High-side switch controlling isolated DC bus delivery to downstream converters.

Use Value: 40 V rating and 70 A current capability support 1 kW+ output with minimal paralleling.

Motor Drive Inverter

LED Driver Power Stage

Use Scenario: Half-bridge leg in 24 V BLDC motor controllers for HVAC blowers and pumps.

IC Role / Device Role / Timing Role: Low-side switch in three-phase inverter bridge with PWM frequency up to 20 kHz.

Use Value: Fast switching (Q_gd/Q_g = 0.34) reduces switching loss and audible noise during commutation.

Use Scenario: Constant-current switching regulator for high-bay LED luminaires (100–200 W).

IC Role / Device Role / Timing Role: Main pass element regulating LED string current in buck topology.

Use Value: Rugged UIS rating ensures survival during LED open-circuit transients without added protection.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRF7470PBF	R_DS(on) = 6.5 mΩ @ 10 V; higher Q_g (42 nC); TO-252 package.	Slightly lower current rating (60 A); less efficient at high-frequency PWM due to higher gate charge.	Acceptable where 1.3 mΩ higher R_DS(on) is tolerable and gate drive strength permits higher Q_g.
STL110N4F7AG	R_DS(on) = 4.7 mΩ @ 10 V; 100 A rating; same TO-252 footprint but different pinout (G-D-S vs G-S-D).	Higher current capacity but requires PCB layout revision due to reversed source/drain pin assignment.	Not drop-in; only viable with board redesign to accommodate pinout inversion and thermal pad re-routing.

Compared with IRF7470PBF and STL110N4F7AG, the AOD4128 delivers optimal balance of low R_DS(on), moderate gate charge, and verified pin-compatible layout in standard DPAK footprints-making it preferred for cost-sensitive, high-volume 40 V power stages without redesign.

Availability

AOD4128 is available at Aetrix Electronics and suitable for server VRMs, industrial SMPS, and motor drive inverters requiring stable component supply, halogen-free compliance, and proven thermal performance in TO-252 packages.

Supply support for AOD4128 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, telecom, and industrial markets.

The AOD4128 belongs to AOS's "AlphaMOS" logic-level N-channel portfolio, designed specifically for high-efficiency, high-current DC-DC conversion where low R_DS(on) and ruggedness are critical.

FAQ

What is the maximum junction temperature for the AOD4128?

The AOD4128 has a maximum rated junction temperature of 175 °C. This rating is validated under steady-state thermal conditions with proper PCB copper area and airflow. Operation at this limit requires careful thermal design, including adequate copper pour and thermal vias beneath the drain tab. Derating is recommended above 125 °C ambient to maintain long-term reliability of the AOD4128.

Is the AOD4128 halogen-free and RoHS compliant?

Yes, the AOD4128 is halogen-free and RoHS compliant per AOS Green Policy. It meets Br <900 ppm, Cl <900 ppm, and total Br+Cl <1500 ppm at homogeneous material level. All AOD4128 units manufactured after 2010 are green-version parts, consistent with AOS's full conversion to halogen-free molding compounds.

Does the AOD4128 support 3.3 V logic-level gate drive?

No, the AOD4128 is not fully enhanced at 3.3 V gate drive. Its V_GS(th) range is 2.0–3.5 V, and R_DS(on) is specified at V_GS = 10 V (5.2 mΩ). At 4.5 V, R_DS(on) rises to ~9.5 mΩ. For reliable 3.3 V control, a gate driver or level-shifter is required to ensure full enhancement of the AOD4128.

What is the avalanche rating of the AOD4128?

The AOD4128 is rated for repetitive avalanche energy E_AS = 120 mJ at T_J = 25 °C. It undergoes 100% Unclamped Inductive Switching (UIS) testing during production. This rating applies to single-pulse inductive turn-off events and supports robust operation in flyback, boost, and motor drive circuits where voltage spikes occur.

Can the AOD4128 be used in parallel configurations?

Yes, the AOD4128 can be paralleled for higher current handling, provided gate drive impedance is matched and thermal coupling is balanced across devices. Its positive temperature coefficient for R_DS(on) promotes current sharing. Layout symmetry, individual gate resistors (≥5 Ω), and shared thermal mass are essential to avoid thermal runaway in parallel AOD4128 configurations.

AOD4128 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 25 V

Current - Continuous Drain (Id) @ 25°C:: 60A (Tc)

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

Rds On (Max) @ Id, Vgs:: 4mOhm @ 20A, 10V

Vgs(th) (Max) @ Id:: 2.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 80 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 4300 pF @ 12.5 V

FET Feature:: -

Power Dissipation (Max):: 2W (Ta), 75W (Tc)

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-252 (DPAK)

AOD4128 FAQ

1.How can I place an order for AOD4128 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOD4128 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 AOD4128 reliable?

The price and inventory of AOD4128 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOD4128 is usually 5 days.

3.What payment methods are accepted for AOD4128?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOD4128 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOD4128?

AOD4128 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOD4128 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 AOD4128?

For technical support, including AOD4128 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOD4128 requirements.

6.How does Aetrix verify that AOD4128 is sourced from the original manufacturer or authorized distributors?

All AOD4128 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 AOD4128 meets industry standards.

7.What is the process for return or replacement of AOD4128?

All AOD4128 units undergo pre-shipment inspection (PSI). If there is an issue with AOD4128, 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 AOD4128 part is unused and in its original packaging.

Return procedure for AOD4128:

1.Submit a request within 90 days.

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

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