ST Life.augmented


NFC controller Card , Reader and P2P, NFC forum compliant
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The ST21NFCA is a standalone chip designed for supporting 13.56 MHz contactless communication, including Near Field Communication (NFC) functions in three operating modes: card emulation, reader/writer and peer-to-peer communication.

The ST21NFCA is designed for an optimized integration with the standard communication links for a cell phone.

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Errata Sheet
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Data Brief

Key Features

  • ST21NFCA operating modes supported:
  • Card emulation
  • Reader/Writer
  • Peer-to-peer communication
  • Hardware features
  • Enhanced 8/16-bit CPU core
  • 112 Kbytes of ROM
  • 4 Kbytes of RAM
  • 36 Kbytes of EEPROM
  • High integrated analog front end (AFE) for RF transmission and reception including automatic card and field detection modes
  • Full Power and Low Power modes supported
  • Optimized power consumption modes
  • SIM and ST21NFCA power management functions
  • 3V power supply
  • Supports Class B and C for UICC (Universal Integrated Circuit Card)
  • RF communications
  • ISO/IEC 14443 A&B in both PICC (Proximity Card) and PCD (Proximity Coupling Device) modes
  • ISO/IEC 15693 in VCD (Vicinity Coupling Device) mode
  • ISO/IEC 18092 (NFCIP-1)
  • NFC Forum tags types 1 to 4 supported (Topaz®, MIFARE® Ultralight, Jewel®, FeliCa™ Open Tag, ST23YR18/80 with Type 4 applet)
  • Host communication interfaces
  • Single Wire Protocol (SWP) interface with support for contactless tunneling mode (CLT)
  • I2C Slave interface
  • SPI Slave interface
  • Interrupt mode for SPI and I2C interfaces
  • Software features
  • Includes all drivers supporting the handling and host protocols for contact and contactless interfaces
  • Includes complete firmware driving switch modes between operating modes and host controller interface functions (based on [ETSI TS 102 622 HCI])
  • Product configuration/patchability via I2C and SPI
  • Automatic AID (Application Identifier) routing
  • Dual Secure Element support
  • Evaluation kit
  • An evaluation board is available to evaluate the advantages of the ST21NFCA router IC and to facilitate the development of NFC, Contactless and RFID applications. Please contact ST sales office for more information.

Circuit Diagram

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB0555: Near field communication microcontroller
3.0 238 KB

Publications and Collaterals


Description Version Size
ST21NFCA and ST33F1M complete offer for NFC-enabled devices
1.3 276 KB

Sample & Buy

Part Number Marketing StatusPackagePacking TypeOrder From STUnit Price (US$)*
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
ST21NFCAActiveDICENot Applicable-No availability reported, please contact our Sales officeN/A-

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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