The RTL8306SD-GR with Ethernet ICs PQFP-128_20x14x05P RoHS is a high performance 10/100Mbps 5-port Fast Ethernet switch manufactured by Realtek. It is an integrated Fast Ethernet switch IC designed for embedded systems requiring versatile application and small package size. It supports one console port and one 10/100M port to connect with an external device such as a router, hub, or switch. It provides five 100Mbps Ethernet ports for switching applications, data routing, and network traffic management. It is also RoHS compliant, making it environmentally friendly. The RTL8306SD-GR supports IEEE802.3, IEEE802.3u, IEEE802.3x, IEEE802.1p, and IEEE802.1q protocols and advanced features including Advanced Quality of Service (QoS), Multiple VLANs, Support for Spanning Tree (STP) and Rapid Spanning Tree (RSTP), and EtherBand. The PQFP-128_20x14x05P package measures 20 mm x 14 mm x 0.5 mm and is designed for reliable operation in high temperature, high vibration, and corrosive environments.