KSZ8999I: Overview, Features, and Applications


The KSZ8999I is a nine-port managed Ethernet switch IC developed by Microchip Technology. This switch is designed for use in various networking applications, providing advanced features for Ethernet connectivity. Here's an overview of its features and typical applications:


  • Type: Nine-Port Managed Ethernet Switch IC
  • Manufacturer: Microchip Technology (formerly Microsemi)
  • Package: 64-pin QFN (Quad Flat No-Lead)



  1. High Integration: The KSZ8999I integrates nine ports of 10/100 Mbps Ethernet with advanced features in a single chip, reducing the complexity of system designs.

  2. Managed Switch: It is a managed switch, offering more advanced networking features compared to unmanaged switches, such as VLAN support, QoS, and network management functionality.

  3. Advanced QoS Support: The IC includes Quality of Service (QoS) capabilities, allowing for traffic prioritization and management to ensure efficient and reliable data transmission.

  4. Low Power Consumption: It is designed for low power consumption, making it suitable for power-sensitive applications and aiding in overall energy efficiency.

  5. Integrated Memory Buffers: The KSZ8999I integrates memory buffers to enhance packet switching and forwarding performance.

  6. Comprehensive Management Interface: It provides robust management interfaces such as I2C, SPI, and MDC/MDIO for configuration, monitoring, and control.

  7. Advanced Security Features: The IC supports advanced security features such as access control lists (ACLs), IEEE 802.1X, and other security mechanisms to ensure network integrity.


  1. Industrial Ethernet Switches: Used in industrial networking equipment and automation systems for reliable communication in harsh environments.

  2. Enterprise Switching Solutions: Applied in enterprise-grade network switches to provide advanced management and QoS features for reliable data transmission.

  3. Smart Home Networking: Used in smart home devices and systems that require managed Ethernet connectivity for smart appliances, surveillance systems, and home automation.

  4. Networked Control and Monitoring Systems: Integrated into control and monitoring systems for improved network management and QoS control in commercial and industrial settings.

  5. Embedded Systems: Employed in embedded networking applications where advanced switch features and reliable communication are essential, such as in IoT devices, printers, and networked peripherals.

  6. Telecommunications Equipment: Used in networking and telecommunications equipment for reliable data transmission and advanced switch management capabilities.

  7. Traffic Management and Distribution: Integrated into networking equipment for traffic management, load balancing, and network segmentation in various networking and data center applications.

The KSZ8999I is a highly integrated, managed Ethernet switch IC with advanced features, making it suitable for a wide range of networking applications, including industrial, enterprise, smart home, and embedded systems where advanced switch features and reliable data transmission are essential.