NFC Chip (IC)

What Is an NFC Chip?

An NFC chip (also called NFC IC) is the silicon die at the heart of every NFC tagNFC tagPassive unpowered device storing data, powered by reader's RF fieldView full →. It contains EEPROM memory for data storage, an RF analog front-end for wireless communication, digital logic for protocol handling, and optionally a cryptographic co-processor for AES encryption. The chip is bonded to an NFC antenna to form a complete NFC tag.

Internal Architecture

A modern NFC chip integrates several functional blocks:

• RF front-end: Rectifier, voltage regulator, clock recovery, and modulator/demodulator. Harvests energy from the reader's RF field.
• Digital controller: Implements the NFC protocol state machine for anti-collision, command parsing, and memory access.
• EEPROMEEPROMNon-volatile memory technology retaining data without powerView full → memory: Non-volatile storage organized into pages or blocks. Stores NDEF data, lock bits, and the UID.
• Cryptographic engine (secure chips): Hardware accelerator for AES-128 or 3DES operations.

Major Chip Families

Physical Characteristics

NFC chip dies measure 0.5 to 2 mm per side with 50-75 micrometer thickness. This enables embedding in stickers, cards, wristbands, and even fabric threads. The chip connects to the antenna via two bond pads using conductive adhesive, ultrasonic welding, or flip-chip techniques.

Choosing an NFC Chip

Selection depends on: user memory requirements, security needs (password protection vs AES vs anti-cloning), RF protocol (NFC-A vs NFC-V), cost (NTAG 213 under $0.10; DESFire EV3 $0.50-$1.50), and special features like counters, UID mirroring, or tamper detection.