The MCRF250 is equipped with an anti-collision feature that allows multiple tags in the same field to be read simultaneously. This revolutionary feature eliminates the issue of data corruption due to simultaneous transmissions from multiple tags. The MCRF250 is a passive Radio Frequency Identification (RFID) device for low frequency applications (100 kHz-400 kHz). The device is powered by rectifying an incoming RF signal from a reader interrogator. The device requires an external LC resonant circuit to receive the incoming energizing signal and to send data. The device develops a sufficient DC voltage for operation when it's external coil voltage reaches approximately 10 VPP. This device has a total of 128 bits of user programmable memory and an additional 12 bits in its configuration register. The user can manually program the 128 bits of user memory by using a contactless programmer in a microID developer kit such as DV103001 or PG103001. However, in production volume the MCRF250 is programmed at the factory (Microchip SQTP - see Technical Bulletin TB023).The device is a One-Time Programmable (OTP) integrated circuit and operates as a read-only device after programming.