# RFID Card Low Frequency IC EM4450: A Comprehensive Guide ## Introduction to RFID Technology and EM4450 RFID card low frequency IC EM4450 represents a cornerstone in access control and identification systems. As someone who has worked with RFID technology for over a decade, I've witnessed firsthand how these unassuming chips transform security protocols. My journey began when I installed my first RFID-based access system for a corporate client, marveling at how a simple card could replace cumbersome key systems. The EM4450, in particular, has been a reliable workhorse in numerous applications I've implemented. ## Technical Specifications of EM4450 IC ### Detailed Technical Parameters The EM4450 is a low-frequency RFID integrated circuit operating at 125 kHz. Below are the detailed technical specifications: **Electrical Characteristics:** - Operating Frequency: 125 kHz ± 7 kHz - Supply Voltage: 3V to 12V (programming mode) - Read Voltage: 3V to 7V - Current Consumption: < 5μA (standby), < 50μA (active) - Data Retention: 10 years minimum - Write/Erase Cycles: 100,000 minimum **Memory Configuration:** - Total Memory: 264 bits - User Memory: 224 bits (28 bytes) - Organization: 11 blocks of 24 bits each - Unique ID: 40-bit factory programmed (32-bit serial number + 8-bit manufacturer code) **Physical Dimensions:** - Chip Size: 1.2mm × 1.2mm - Bond Pad Dimensions: 100μm × 100μm - Recommended Antenna Coil: 70-100 turns of 0.1mm wire - Typical Card Dimensions: 85.6mm × 54mm × 0.76mm (ISO/IEC 7810 ID-1) **Communication Protocol:** - Modulation: ASK (Amplitude Shift Keying) - Data Rate: 2-5 kbps - Manchester Encoding - Read Range: 5-10 cm (depending on antenna design) **Security Features:** - 64-bit Authentication Key - 24-bit Transmission Code - Anti-collision capability - Write protection capability *Note: These technical parameters are reference data. For exact specifications and implementation details, please contact our backend management team.* ## Personal Experience with EM4450 Implementation During my tenure as a security systems consultant, I encountered a particularly challenging project involving a multi-tenant office building. The client needed a solution that would provide secure access while maintaining individual tenant privacy. The RFID card low frequency IC EM4450 proved ideal for this application. What impressed me most was its reliability - over three years of cont