KSZ8081RNACA 1/1 Transceiver Full RMII 24-QFN: Pinout, Datasheet, and Equivalents
24 Terminations KSZ8081 Receivers 1/1 Drivers/Receivers 1 Functions
KSZ8081RNACA is an Ethernet physical-layer transceiver with a single supply for data transmission. This article is going to introduce pinout, applications, features, and more details about KSZ8081RNACA.

Electronics: KSZ8081RNACA phy address setting up
Overview of KSZ8081RNACA
The KSZ8081RNACA is a 10BASE-T/100BASE-TX Ethernet physical-layer transceiver with a single supply for data transmission and reception over CAT-5 unshielded twisted pair (UTP) cable.
The KSZ8081RNACA is a PHY solution with a high level of integration. It uses on-chip termination resistors for the differential pairs, integrates a low-noise regulator to supply the 1.2V core, and supports 1.8/2.5/3.3V digital I/O interfaces, which minimizes board cost and simplifies board architecture.
For direct connection to RMII-compliant MACs in Ethernet processors and switches, the KSZ8081RNACA supports the Reduced Media Independent Interface (RMII).
KSZ8081RNACA Features
• IEEE 802.3 Compliant Single-Chip 10BASE-T/100BASE-TX Ethernet Transceiver
• RMII v1.2 Interface Support with Output to MAC of 50 MHz Reference Clock and Input of 50 MHz Reference Clock
• Support for RMII Back-to-Back Mode on a 100 Mbps Copper Repeater
• PHY Register Configuration through MDC/MDIO Management Interface
• Interrupt Output that can be programmed
• Link and Activity Status Indication LED Outputs
• Differential Pair Termination Resistors on the Chip
• Wander Correction at the Start
• Disable and Enable Option for HP Auto MDI/MDI-X to Reliably Detect and Correct Straight-Through and Crossover Cable Connections
• Auto-Negotiation to Choose the Fastest Link-Up Speed (10/100 Mbps) and Duplex (Half/Full) Automatically
• Energy-Saving and Power-Down Modes
• Faulty Copper Cabling Detection with LinkMD® TDR-Based Cable Diagnostics
• Fault Detection Between Chip I/Os and the Board with Parametric NAND Tree Support
• ESD Rating of HBM (6 kV)
• Diagnostics Loopback Modes
• Single 3.3V power supply with 1.8V, 2.5V, or 3.3V VDD I/O options
• Core has a built-in 1.2V regulator.
• Available in a 24-pin QFN package with dimensions of 4 mm x 4 mm.
KSZ8081RNACA Pinout

KSZ8081RNACA Pinout
KSZ8081RNACA Block Diagram

KSZ8081RNACA Block Diagram
KSZ8081RNACA Circuit

KSZ8081RNACA Circuit
KSZ8081RNACA 3D Model

KSZ8081RNACA Symbol

KSZ8081RNACA Footprint

KSZ8081RNACA 3D Model
Specifications
- TypeParameter
- Factory Lead Time12 Weeks
- Mount
In electronic components, the term "Mount" typically refers to the method or process of physically attaching or fixing a component onto a circuit board or other electronic device. This can involve soldering, adhesive bonding, or other techniques to secure the component in place. The mounting process is crucial for ensuring proper electrical connections and mechanical stability within the electronic system. Different components may have specific mounting requirements based on their size, shape, and function, and manufacturers provide guidelines for proper mounting procedures to ensure optimal performance and reliability of the electronic device.
Surface Mount - Mounting Type
The "Mounting Type" in electronic components refers to the method used to attach or connect a component to a circuit board or other substrate, such as through-hole, surface-mount, or panel mount.
Surface Mount - Package / Case
refers to the protective housing that encases an electronic component, providing mechanical support, electrical connections, and thermal management.
24-VFQFN Exposed Pad - Manufacturer Package Identifier
The Manufacturer Package Identifier is a unique code or label assigned by the manufacturer to identify a specific package or housing style of an electronic component. This identifier helps in distinguishing between different package types of the same component, such as integrated circuits, transistors, or diodes. It typically includes information about the package dimensions, lead configuration, and other physical characteristics of the component. The Manufacturer Package Identifier is crucial for ensuring compatibility and proper assembly of electronic components in various devices and circuits.
QFN44-24LD-PL-1 - Usage LevelAutomotive grade
- Operating Temperature
The operating temperature is the range of ambient temperature within which a power supply, or any other electrical equipment, operate in. This ranges from a minimum operating temperature, to a peak or maximum operating temperature, outside which, the power supply may fail.
0°C~70°C - Packaging
Semiconductor package is a carrier / shell used to contain and cover one or more semiconductor components or integrated circuits. The material of the shell can be metal, plastic, glass or ceramic.
Tube - Published2015
- JESD-609 Code
The "JESD-609 Code" in electronic components refers to a standardized marking code that indicates the lead-free solder composition and finish of electronic components for compliance with environmental regulations.
e3 - Part Status
Parts can have many statuses as they progress through the configuration, analysis, review, and approval stages.
Active - Moisture Sensitivity Level (MSL)
Moisture Sensitivity Level (MSL) is a standardized rating that indicates the susceptibility of electronic components, particularly semiconductors, to moisture-induced damage during storage and the soldering process, defining the allowable exposure time to ambient conditions before they require special handling or baking to prevent failures
2 (1 Year) - Number of Terminations24
- TypeTransceiver
- Terminal Finish
Terminal Finish refers to the surface treatment applied to the terminals or leads of electronic components to enhance their performance and longevity. It can improve solderability, corrosion resistance, and overall reliability of the connection in electronic assemblies. Common finishes include nickel, gold, and tin, each possessing distinct properties suitable for various applications. The choice of terminal finish can significantly impact the durability and effectiveness of electronic devices.
Matte Tin (Sn) - Voltage - Supply
Voltage - Supply refers to the range of voltage levels that an electronic component or circuit is designed to operate with. It indicates the minimum and maximum supply voltage that can be applied for the device to function properly. Providing supply voltages outside this range can lead to malfunction, damage, or reduced performance. This parameter is critical for ensuring compatibility between different components in a circuit.
1.8V 2.5V 3.3V - Terminal Position
In electronic components, the term "Terminal Position" refers to the physical location of the connection points on the component where external electrical connections can be made. These connection points, known as terminals, are typically used to attach wires, leads, or other components to the main body of the electronic component. The terminal position is important for ensuring proper connectivity and functionality of the component within a circuit. It is often specified in technical datasheets or component specifications to help designers and engineers understand how to properly integrate the component into their circuit designs.
QUAD - Terminal Form
Occurring at or forming the end of a series, succession, or the like; closing; concluding.
NO LEAD - Peak Reflow Temperature (Cel)
Peak Reflow Temperature (Cel) is a parameter that specifies the maximum temperature at which an electronic component can be exposed during the reflow soldering process. Reflow soldering is a common method used to attach electronic components to a circuit board. The Peak Reflow Temperature is crucial because it ensures that the component is not damaged or degraded during the soldering process. Exceeding the specified Peak Reflow Temperature can lead to issues such as component failure, reduced performance, or even permanent damage to the component. It is important for manufacturers and assemblers to adhere to the recommended Peak Reflow Temperature to ensure the reliability and functionality of the electronic components.
260 - Number of Functions1
- Supply Voltage
Supply voltage refers to the electrical potential difference provided to an electronic component or circuit. It is crucial for the proper operation of devices, as it powers their functions and determines performance characteristics. The supply voltage must be within specified limits to ensure reliability and prevent damage to components. Different electronic devices have specific supply voltage requirements, which can vary widely depending on their design and intended application.
3.3V - Terminal Pitch
The center distance from one pole to the next.
0.5mm - Time@Peak Reflow Temperature-Max (s)
Time@Peak Reflow Temperature-Max (s) refers to the maximum duration that an electronic component can be exposed to the peak reflow temperature during the soldering process, which is crucial for ensuring reliable solder joint formation without damaging the component.
40 - Base Part Number
The "Base Part Number" (BPN) in electronic components serves a similar purpose to the "Base Product Number." It refers to the primary identifier for a component that captures the essential characteristics shared by a group of similar components. The BPN provides a fundamental way to reference a family or series of components without specifying all the variations and specific details.
KSZ8081 - JESD-30 Code
JESD-30 Code refers to a standardized descriptive designation system established by JEDEC for semiconductor-device packages. This system provides a systematic method for generating designators that convey essential information about the package's physical characteristics, such as size and shape, which aids in component identification and selection. By using JESD-30 codes, manufacturers and engineers can ensure consistency and clarity in the specification of semiconductor packages across various applications and industries.
S-XQCC-N24 - Number of Channels1
- Interface
In electronic components, the term "Interface" refers to the point at which two different systems, devices, or components connect and interact with each other. It can involve physical connections such as ports, connectors, or cables, as well as communication protocols and standards that facilitate the exchange of data or signals between the connected entities. The interface serves as a bridge that enables seamless communication and interoperability between different parts of a system or between different systems altogether. Designing a reliable and efficient interface is crucial in ensuring proper functionality and performance of electronic components and systems.
Ethernet - Data Rate
Data Rate is defined as the amount of data transmitted during a specified time period over a network. It is the speed at which data is transferred from one device to another or between a peripheral device and the computer. It is generally measured in Mega bits per second(Mbps) or Mega bytes per second(MBps).
100 Mbps - Protocol
In electronic components, the parameter "Protocol" refers to a set of rules and standards that govern the communication between devices. It defines the format, timing, sequencing, and error checking methods for data exchange between different components or systems. Protocols ensure that devices can understand and interpret data correctly, enabling them to communicate effectively with each other. Common examples of protocols in electronics include USB, Ethernet, SPI, I2C, and Bluetooth, each with its own specifications for data transmission. Understanding and adhering to protocols is essential for ensuring compatibility and reliable communication between electronic devices.
RMII - Number of Drivers/Receivers1/1
- Duplex
In the context of electronic components, "Duplex" refers to a type of communication system that allows for bidirectional data flow. It enables two devices to communicate with each other simultaneously, allowing for both sending and receiving of data at the same time. Duplex communication can be further categorized into two types: half-duplex, where data can be transmitted in both directions but not at the same time, and full-duplex, where data can be sent and received simultaneously. This parameter is crucial in networking and telecommunications systems to ensure efficient and effective data transmission between devices.
Full - Simplex/Duplex
In electronic components, the parameter "Simplex/Duplex" refers to the type of communication or data transmission mode supported by the component. Simplex communication is a one-way communication mode where data flows only in one direction, from the sender to the receiver. This means that the sender can only transmit data, and the receiver can only receive data. On the other hand, duplex communication is a two-way communication mode where data can flow in both directions, allowing for simultaneous transmission and reception of data between two devices. Understanding whether a component supports simplex or duplex communication is important for determining how data will be exchanged between devices and ensuring compatibility in a given system.
Full Duplex - Max Junction Temperature (Tj)
Max Junction Temperature (Tj) refers to the maximum allowable temperature at the junction of a semiconductor device, such as a transistor or integrated circuit. It is a critical parameter that influences the performance, reliability, and lifespan of the component. Exceeding this temperature can lead to thermal runaway, breakdown, or permanent damage to the device. Proper thermal management is essential to ensure the junction temperature remains within safe operating limits during device operation.
125°C - Ambient Temperature Range High
This varies from person to person, but it is somewhere between 68 and 77 degrees F on average. The temperature setting that is comfortable for an individual may fluctuate with humidity and outside temperature as well. The temperature of an air conditioned room can also be considered ambient temperature.
70°C - Height900μm
- Length4mm
- Width4mm
- RoHS Status
RoHS means “Restriction of Certain Hazardous Substances” in the “Hazardous Substances Directive” in electrical and electronic equipment.
ROHS3 Compliant
KSZ8081RNACA Applications
• Game Consoles
• IP Phones
• IP Set-Top Boxes
• IP TVs
• LOM
• Printers
KSZ8081RNACA Equivalents
| KSZ8021RNL | KSZ8031RNLI-TR | |
| Descriptions | Interface - Drivers, Receivers, Transceivers 24-VFQFN Exposed Pad 1.8V 2.5V 3.3V 0°C~70°C KSZ8021 IC TRANSCEIVER FULL 1/1 24QFN | Interface - Drivers, Receivers, Transceivers 24-VFQFN Exposed Pad 1.8V 2.5V 3.3V -40°C~85°C KSZ8031 IC TRANSCEIVER FULL 1/1 24QFN |
| Images | ![]() | ![]() |
| Datasheet | KSZ8021RNL Datasheet | KSZ8031RNLI-TR Datasheet |
KSZ8081RNACA Package information

KSZ8081RNACA Package information
KSZ8081RNACA Manufacturer
Microchip Technology Inc. is a prominent provider of microcontroller and analog semiconductors, offering low-risk product development, reduced overall system cost, and faster time to market to thousands of customers across the world. Microchip, which is based in Chandler, Arizona, provides excellent technical support as well as consistent delivery and quality.
Datasheet PDF
- Datasheets :
- PCN Design/Specification :
- PCN Assembly/Origin :
- PCN Packaging :
- ConflictMineralStatement :
Popularity by Region
Parts with Similar Specs
How many pins of KSZ8081RNACA ?
24 pins.
What’s the operating temperature of KSZ8081RNACA?
0°C~70°C.
What’s the supply voltage of KSZ8081RNACA ?
3.3V.
What’s the packaging way of KSZ8081RNACA ?
24-VFQFN Exposed Pad Tube.
What’s the Peak Reflow Temperature of KSZ8081RNACA?
260.
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