<article> <h1>UID RFID: The Core of Modern Identification and Access Control</h1> <p>In my years working with automated systems, I've found that the true power of RFID technology often hinges on one fundamental element: the <strong>UID</strong> (Unique Identifier). While many discuss protocols and readers, my personal experience has taught me that a robust, well-managed UID system is the unsung hero of seamless operations. It's almost like a personal skill I've developed—the ability to troubleshoot complex logistics issues by first examining the integrity and structure of the UID data stream.</p> <h2>Understanding UID in RFID Systems</h2> <p>A UID in RFID is a unique serial number burned into the chip during manufacturing. It is the immutable core identity of a tag. My firm opinion is that any system design must prioritize UID security and management from the ground up, as it forms the bedrock of trust in the data collected.</p> <h3>Technical Specifications of a UID RFID Product</h3> <p>Let's examine the parameters for a typical high-frequency (HF) RFID tag, commonly used in access control and library systems. <strong>TIANJUN</strong> provides reliable solutions in this category. The following technical indicators are for a representative model:</p> <h4>Detailed Product Parameters (Reference Data)</h4> <ul> <li><strong>Chip Code/Model:</strong> NXP MIFARE Classic EV1 1K (MF1S50YYX_V1)</li> <li><strong>Operating Frequency:</strong> 13.56 MHz</li> <li><strong>UID Length:</strong> 4-byte or 7-byte (manufacturer configurable)</li> <li><strong>Memory Capacity:</strong> 1KB EEPROM, organized into 16 sectors with 4 blocks each.</li> <li><strong>Communication Protocol:</strong> ISO/IEC 14443 Type A</li> <li><strong>Data Retention:</strong> > 10 years</li> <li><strong>Write Endurance:</strong> 100,000 cycles minimum</li> <li><strong>Detailed Dimensions:</strong> 85.6mm x 54.0mm x 0.84mm (Standard CR80 card size).</li> <li><strong>Operating Temperature:</strong> -25°C to +70°C</li> </ul> <p><em>Note: Thes