KSZ8851SNL Ethernet Controller with SPI: Datasheet, Applications

KSZ8851SNL Ethernet Controller with SPI: Datasheet, Applications

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  • Time of issue:2022-08-17 17:05
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(Summary description)KSZ8851SNL Ethernet Controller with SPI: Datasheet, Applications

KSZ8851SNL Ethernet Controller with SPI: Datasheet, Applications

(Summary description)KSZ8851SNL Ethernet Controller with SPI: Datasheet, Applications

  • Categories:News
  • Author:
  • Origin:
  • Time of issue:2022-08-17 17:05
  • Views:


The KSZ8851SNL is a single-chip Fast Ethernet controller consisting of a 10/100 physical layer transceiver (PHY), a MAC, and a Serial Peripheral Interface (SPI). The KSZ8851SNL is designed to enable an Ethernet network connectivity with any host microcontroller equipped with SPI interface. The KSZ8851SNL offers the most cost-effective solution for adding high-throughput Ethernet link to traditional embedded systems with SPI interface.


The KSZ8851SNL is a single chip, mixed analog/digital device offering Wake-on-LAN technology for effectively addressing Fast Ethernet applications. It consists of a Fast Ethernet MAC controller, SPI, and incorporates a unique dynamic memory pointer with 4-byte buffer boundary and a fully usable 18 KB for both TX (allocated 6 KB) and RX (allocated 12 KB) directions in host buffer interface.


The KSZ8851SNL is designed to be fully compliant with the appropriate IEEE 802.3 standards. An industrial temperature-grade version, the KSZ8851SNLI, is also available.



CAD Models



Figure: PCB Symbol




Figure: Footprint




Figure: 3D Model


Pin Configuration



Figure: Pin Configuration


Block Diagram



Figure: Block Diagram



  • Integrated MAC and PHY Ethernet Controller Fully Compliant with IEEE 802.3/802.3u Standards

  • SPI with Clock Speeds up to 40 MHz for High Throughput Applications

  • Supports 10BASE-T/100BASE-TX

  • Supports IEEE 802.3x Full-Duplex Flow Control and Half-Duplex Backpressure Collision Flow Control

  • Supports RXQ and TXQ FIFO DMA for Fast Data Read and Write Transfers

  • Supports IP Header (IPv4)/TCP/UDP/ICMP Checksum Generation and Checking

  • Supports IPv6 TCP/UDP/ICMP Checksum Generation and Checking

  • Automatic 32-bit CRC Generation and Checking

  • Supports Simple Command and Data Phases in SPI Cycle for RXQ/TXQ FIFO and Registers Read/Write

  • Supports Multiple Data Frames for TXQ FIFO and RXQ FIFO without Additional Command Phase

  • Supports Flexible Byte (8-bit), Word (16-bit) and Double Word (32-bit) Read/Write Access to Internal Registers

  • Larger Internal Memory with 12K Bytes for RX FIFO and 6K Bytes for TX FIFO. Programmable Low, High, and Overrun Watermark for Flow Control in RX FIFO

  • Efficient Architecture Design with Configurable Host Interrupt Schemes to Minimize Host CPU Overhead and Utilization

  • Powerful and Flexible Address Filtering Scheme

  • Optional to Use External Serial EEPROM Configuration for MAC Address

  • Single 25 MHz Reference Clock for Both PHY and MAC



  • Video/Audio Distribution Systems

  • Voice over IP (VoIP) and Analog TelephoneAdapters (ATA)

  • Building Automation

  • Industrial Control Sensor Devices (Temperature, Pressure, Levels, and Valves)

  • Security, Motion Control, and Surveillance Cameras



You can download the datasheet the link given below.




Category Integrated Circuits (ICs)
Interface - Controllers
Mfr Microchip Technology
Package Tray
Product Status Active
Protocol Ethernet
Function Controller
Interface SPI
Standards 10/100 Base-T/TX PHY
Voltage - Supply 1.8V, 2.5V, 3.3V
Operating Temperature 0℃-70℃
Package / Case 32-VFQFN Exposed Pad
Supplier Device Package 32-QFN (5x5)
Base Product Number KSZ8851



Microchip Technology Inc. is a publicly-listed American corporation that manufactures microcontroller, mixed-signal, analog and Flash-IP integrated circuits. Its products include microcontrollers (PIC, dsPIC, AVR and SAM), Serial EEPROM devices, Serial SRAM devices, embedded security devices, radio frequency (RF) devices, thermal, power and battery management analog devices, as well as linear, interface and wireless products.


Using Warning

Note: Please check their parameters and pin configuration before replacing them in your circuit.



What is Ethernet IC?

Ethernet interface ICs are hardware components which allow communication between devices, using Ethernet protocol. Ethernet is a popular for of LAN (Local Area Network) technology which is used to connect computers to the internet.


What speed is Fast Ethernet?

A Fast Ethernet switch can transfer data packets at a rate of 10 megabits per second. A Gigabit Ethernet switch transfers data packets at relatively higher speeds of one gigabit per second. In comparison, a Gigabit Ethernet switch can transfer data packets at around 100 times faster than a Fast Ethernet switch.


Is Ethernet faster than Wi-Fi?

To access a network via an Ethernet connection, users need to connect a device using ethernet cable. An Ethernet connection is generally faster than a WiFi connection and provides greater reliability and security.




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