How to Understand STM32 Naming Conventions?

STMicroelectronics, a global leader in semiconductor solutions, offers a diverse range of electronic components, microcontrollers, and integrated circuits. If you have ever explored their product catalog, you may have noticed the alphanumeric part numbers attached to each component.

In this article, we will delve into the ST nomenclature, deciphering its structure and shedding light on the information it conveys.

Prefix: Identifying the Component Type

The part number of an STMicroelectronics component typically begins with a prefix that identifies the component type. Here are a few examples:

  • STM: This prefix is used for STM32 and STM8 microcontrollers. The STM32 series is highly popular and widely used in various embedded systems and IoT applications.
  • STP: Represents power MOSFETs, which are used for high-power switching applications.
  • STB: Indicates voltage regulators and controllers.
  • STN: Refers to voltage references and supervisory circuits.
  • STP: Signifies operational amplifiers (op-amps).
  • STD: Represents diodes, including rectifiers, Schottky diodes, and zener diodes.

These prefixes help categorize the components and provide a quick overview of their general functionality.

Numbering System: Understanding the Series and Variants

After the prefix, the part number often includes a series of numbers that represent the specific series and variants of the component. These numbers can signify various aspects, including but not limited to:

  • Different generations or families of a particular component.
  • Different versions or revisions within a family.
  • Different performance grades or features are available within a family.
  • Specific applications or use cases.

The image below will help you understand the meaning of each value within every field mentioned above.

Within the device subfamily, STMicroelectronics further divides it into two distinct parts: the core and the line.

These two divisions help to categorize and differentiate devices within the subfamily based on their core architecture and specific product lines.


  • The core refers to the underlying microcontroller core architecture used in the devices within the subfamily.
  • It represents the fundamental processing unit and instruction set architecture of the microcontroller.
  • In this context, the core can indicate a specific type of ARM core, such as Cortex-M0, Cortex-M3, or Cortex-M4, which defines the processing capabilities, performance, and feature set of the microcontroller.
  • Different cores offer varying levels of computational power and functionality, allowing developers to choose the one that best suits their application requirements.


  • The line represents the specific product lines or series within the subfamily.
  • It signifies variations or subsets of devices that share common features, peripherals, memory configurations, and target applications.
  • These product lines may differ in terms of performance, memory capacity, pin count, integrated peripherals, or targeted market segments.
  • Each line is tailored to meet specific application needs, enabling developers to select a device that aligns closely with their project requirements.

Suffixes: Highlighting Additional Features or Specifications

Suffixes are additional letters or numbers appended to the end of the part number. These suffixes convey extra information about the component, such as additional features, package types, temperature ranges, or specific specifications.

Here are a few common examples:

  • -6: Denotes industrial temperature range (-40°C to 85°C).
  • -7: Signifies extended temperature range (-40°C to 105°C).
  • -TR: Represents tape and reel packaging.
  • -T: Refers to LQFP package types.

These suffixes provide important details that help you choose the right component based on environmental conditions, packaging requirements, and regulatory compliance.

Datasheets and Documentation: Your Guide to Detailed Information

STMicroelectronics provides comprehensive documentation, datasheets, and reference manuals for each STM32 microcontroller, allowing you to explore its capabilities in depth.

Official Website Link:

So, whether you’re building an Internet of Things (IoT) device, a robotics project, or an embedded system, the STM32 microcontrollers offer a wide range of options to meet your needs.

With a firm grasp on the nomenclature, you can navigate the STM32 ecosystem with confidence and embark on your microcontroller journey!

Happy coding! 🚀✨

To learn more about the STM32 Nucleo board, click on the following link: STM32 Nucleo Board

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