The KSZ9131RNXC-TR is a reel of the KSZ9131RNXC Ethernet PHY transceiver manufactured by Microchip Technology. The "-TR" in the part number indicates that it is packaged in tape and reel for use in automated manufacturing processes, particularly pick-and-place machines for handling surface mount components.
All functions and applications of KSZ9131RNXC also apply to KSZ9131RNXC-TR. The only difference is - the TR version is supplied in reel form to facilitate mass production in industrial environments.
