10 PCS Ci522 Noncontact Read and Write Chip for Smart IC Card Door Lock Systems QFN16 package | Compatible with RC522 and CV520 | Replacement IC pack Key benefits Direct replacement for RC522 and CV520 modules, allowing quick or upgrade of smart IC card door lock and reader boards. Compact QFN16 package saves PCB space and supports standard surface mount reflow processes for easy integration. Designed for noncontact read and write operations with smart IC cards, restoring device functionality without redesigning the system. Pack of 10 chips provides parts for small repairs, batch replacements, or development prototypes, reducing downtime for access control devices. What this chip does Function: contactless read and write interface for smart IC card systems, suitable for access control and door lock electronics. Compatibility: footprint and electrical behavior intended to RC522 and CV520 chips in compatible modules and circuit boards. Package and material: QFN16 surface mount package with compact footprint for spaceconstrained PCBs. Performance: stable read and write capability for everyday access control applications, suitable for and smallscale production. Why customers need it and maintenance: failed or damaged chips on existing reader and door lock PCBs without redesigning the board. Retrofit and upgrade: swap into RC522 or CV520 based modules to refresh inventory or standardize parts. Prototyping and small production runs: keep multiple chips on hand for testing, development, and lowvolume manufacturing. Typical applications Access control and electronic door locks: restore or the contactless interface IC on door controller PCBs. RFID and NFC reader modules: or upgrade small reader boards used in secure entry points, payment terminals, or time attendance devices. Development and testing: use in prototyping and debugging of smart card reader designs that follow RC522 or CV520 compatibility. Package contents and handling Quantity: 10 pieces of Ci522 chips in QFN16 package. Mounting: intended for surface mount assembly using standard reflow soldering processes. Handle with appropriate ESD precautions and follow manufacturer guidelines for PCB footprint and solder profile. This product is intended for engineers, technicians, and developers working with smart IC card door lock systems and compatible reader modules.