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ST23 Contactless Secure MCU with 4 KBytes EEPROM, enhanced security and DES/AES cryptoprocessor, RF Type A,B,B'
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ST23ZC04 products are secure microcontrollers specially designed for secure smartcard applications.

They are based on an enhanced STMicroelectronics 8/16-bit CPU core offering 16 Mbytes of linear addressing space. ST23ZC04 devices are manufactured using an advanced highly reliable ST CMOS EEPROM technology.

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Errata Sheet
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Data Brief

Key Features

  • Hardware features
  • Enhanced 8/16-bit ST23 CPU core with 16 Mbytes of linear addressable memory
  • 92 Kbytes of User ROM
  • 4 Kbytes of User RAM
  • 0.5 Kbytes dedicated RFUART RAM
  • 4 Kbytes of User EEPROM including 128 Bytes of User OTP area:
  • Highly reliable CMOS EEPROM submicron technology
  • 30-year data retention at 25°C
  • 500,000 Erase/Write cycles endurance at 25° C
  • 1 to 32 byte Erase or Program in 1.5 ms
  • Operating temperature: –25° to +85°C (see restricted test conditions)
  • Three 8-bit timers with watchdog and interrupt capability
  • High performance provided by:
  • CPU clock frequency up to 28 MHz
  • Power-saving Standby state
  • ESD protection greater than 5 kV (HBM)
  • Contactless features
  • Complies with ISO/IEC 14443 Type A, B and B’, and PayPass™ standards
  • 13.56 MHz carrier frequency
  • RF frame up to 512 bytes
  • RFUART (RF universal asynchronous receiver transmitter) up to 848 Kbps
  • Security features
  • Active shield
  • Monitoring of environmental parameters
  • Protection mechanisms against faults
  • True random number generator (TRNG) (AIS-31 Class P2 compliant)
  • 16-bit Cyclic Redundancy Check (CRC) calculation block (ISO/IEC 13239)
  • Unique serial number on each die
  • AES accelerator
  • Three-key Triple DES accelerator (EDES+)
  • Development environment
  • C compiler, simulator and emulator

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB1318: Secure microcontroller with enhanced security with 4 Kbytes EEPROM and contactless-only interface
2.0 102 KB

Publications and Collaterals


Description Version Size
CD21 and CD21 Rev3 for Calypso e-ticketing
1.0.0 205 KB

Sample & Buy

Part Number Marketing StatusAutomotive GradeOrder From STUnit Price (US$)*
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
ST23ZC04Active_-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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