https://www.nxp.com/products/rfid-nfc/hitag-lf/hitag-1-transponder-ic:HT1X?tab=Buy_Parametric_Tab
HT1x | NXP Semiconductors
Secure LF transponder IC with 2048-bit EEPROM memory for vehicle immobilization and access control in harsh industrial environments
nxpsemiconductors