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32bit ARM SC300 secure core with SWP, SPI interfaces and Nescrypt cryptoprocessor
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The ST33F1M is a serial access microcontroller designed for secure mobile applications that incorporates the most recent generation of ARM® processors for embedded secure systems. Its SecurCore® SC300™ 32-bit RISC core is built on the Cortex™ M3 core with additional security features to help to protect against advanced forms of attacks.

Cadenced at 22.5 MHz, the SC300™ core brings great performance and excellent code density thanks to the Thumb®-2 instruction set.

The high-speed embedded Flash with up to 1280 Kbytes of memory introduces more flexibility to the system.

The ST33F1M also offers a serial communication interface fully compatible with the ISO/IEC 7816-3 standard (T=0, T=1) and a single-wire protocol (SWP) interface for communication with a near field communication (NFC) router in SIM/NFC applications.

An SPI Slave interface is also available for communication in non-SIM applications. Note that this interface is not available when ISO/IEC 7816 communications are required.

Three general purpose 16-bit timers are available; one configurable as a watchdog.

The ST33F1M features hardware accelerators for advanced cryptographic functions. The EDES peripheral provides a secure DES (Data Encryption Standard) algorithm implementation, while the NESCRYPT crypto-processor efficiently supports the public key algorithm.

The ST33F family operates in the –25 to +85°C temperature range and 1.8V, 3V and 5V supply voltage ranges. A comprehensive range of power-saving modes enables the design of efficient low-power applications.

In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at:

ECOPACK® is an ST trademark.

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Errata Sheet
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Data Brief

Key Features

  • ST33F1M major applications include:
  • Mobile communications (GSM, 3G and CDMA)
  • Java Card™ applications
  • NFC applications (Banking, Transportation, etc.)
  • Optional MIFARE Classic & DESFire® EV1
  • Secure Element (UICC or embedded)
  • Hardware features
  • ARM® SecurCore® SC300™ 32-bit RISC core
  • Up to 30 Kbytes of User RAM
  • Up to 1280 Kbytes of User Flash memory with OTP area
  • Asynchronous receiver transmitter supporting ISO/IEC 7816-3 T=0 and T=1 protocols (Slave mode supported)
  • Single Wire Protocol (SWP) Interface for communications with NFC router
  • Serial peripheral interface (SPI) slave interface
  • Three 16-bit timers with interrupt capability including one 16-bit timer with watchdog capability
  • 1.8 V, 3 V and 5 V supply voltage ranges
  • External clock frequency from 1 up to 10 MHz
  • Current consumption compatible with GSM and ETSI specifications
  • High performance provided by:CPU clock frequency up to 22.5 MHzExternal clock multiplier (2x, 3x, and 4x)
  • Power-saving standby state
  • Contact assignment compatible with ISO/IEC 7816-2
  • ESD protection greater than 4 kV (HBM)
  • Software features
  • Secure Flash Loader
  • Flash drivers
  • Security features
  • Active shield
  • Memory protection unit (MPU)
  • Monitoring of environmental parameters
  • Protection against faults
  • ISO 3309 CRC calculation block
  • True random number generator
  • Unique serial number on each die
  • Hardware security-enhanced DES accelerator
  • NESCRYPT coprocessor for public key cryptography algorithms (RSA, ECC, etc.)
  • Code/data signature
  • Development environment
  • Software development and firmware generation are supported by a comprehensive set of development tools dedicated to software design and validation: C compiler, simulator and emulator.

Circuit Diagram

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB1218: Secure MCU with 32-bit ARM SC300 CPU, SWP interface, NESCRYPT cryptoprocessor and high-density Flash memory
5.0 281 KB

Publications and Collaterals


Description Version Size
Secure MCUs for mobile communications and M2M
1.0.0 920 KB

Sample & Buy

Part Number Marketing StatusPackageOrder From STUnit Price (US$)*
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
ST33F1MActiveDICE-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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