RFID chip EM4123 is used in passive UHF read-only transponder applications. It is powered up by an RF beam transmitted by the reader, which is received and rectified to generate a supply voltage for the chip. A pre-programmed code is transmitted to the reader by varying the amount of energy that is reflected back to the reader. It implements a robust and fast anti-collision protocol.

The EM4123 is frequency independent and can be used for RF coupled applications where reading ranges in excess of 10 m and reading rates of 120 tags per second at 256 kbit/s can be attained. The circuit is backscattering data using load modulation. Therefore the reader should be able to detect ASK and PSK modulated carrier.

RFID chip EM4123 Benefits:
Anti-collision suited for fast moving objects
Very low current consumption, long range solution
Easy to use, only pure CW RFID reader needed (No dense reader mode issue)
Protocol and coding backward compatible with EM4122 and EM4222
Low cost solutions

RFID chip EM4123 Solutions:
The chip is ideal for applications where long range, high-speed item identification is required:
Supply chain management
Tracking and tracing
Access control
Asset control
Licensing
Auto-tolling
Animal tagging
Sports event timing

RFID chip EM4123 Features:
Factory programmed 64 bit ID number
High data rate: Up to 256 kbit/s
Frequency independent: Typically used at 869 MHz, 902 - 960 MHz (versions 001 to 099)
On-chip oscillator
On-chip rectifier
Low voltage operation - down to 1.0 V at ambient temperature
Tag Talk Only protocol (TTO)
Low power consumption

-40° to +85° C operating temperature

More RFId chip types view http://www.oprfid.com /rfidchip.html