The ATA557001-DDW from Microchip Technology is an RFID transponder IC for 100 kHz to 150 kHz, compliant with ISO 11784 and ISO 11785, supplied as a wafer die.
The ATA557001C-TAQY from Microchip Technology is an RFID transponder IC operating at 100 kHz to 150 kHz to ISO 11784 and ISO 11785, in an 8-SOIC (0.154", 3.90 mm width) package.