STMicroelectronics STM32C071KBU6N

Overview

STM32C071KBU6N from STMicroelectronics is a 32-bit Arm® Cortex®-M0+ microcontroller with 128 KB flash, 24 KB SRAM, USB Full-Speed device interface (crystal-less), dual USARTs supporting LIN/IrDA/ISO7816, and 12-bit ADC with up to 19 external channels - deployed in industrial sensor nodes requiring low-power USB connectivity and deterministic real-time control.

For engineers reviewing the STM32C071KBU6N datasheet, STM32C071KBU6N pinout, STM32C071KBU6N application, or STM32C071KBU6N equivalent, key selection criteria include USB FS crystal-less operation, 5 V-tolerant GPIO count (up to 61), operating temperature range (–40°C to 125°C), and support for secure boot via securable flash area.

Technical Context

The STM32C071KBU6N integrates an Arm Cortex-M0+ core with MPU, running at up to 48 MHz, and features dual clock domains: one driven by a 4–48 MHz HSE crystal oscillator and another by an internal ±1% 48 MHz HSI48 RC oscillator with clock recovery - enabling USB FS without external crystal. Its memory subsystem includes 128 KB of flash with readout protection and securable area, plus 24 KB of parity-checked SRAM.

Peripheral interconnect uses a hierarchical AHB/APB bus matrix with DMA request multiplexer (DMAMUX) supporting flexible channel mapping. The device implements two I²C interfaces (one Fast-mode Plus capable), two SPIs (24 Mbit/s), and two USARTs - one with ISO7816, LIN, IrDA, and auto-baud detection - all configurable via alternate function remapping across up to 61 GPIO pins.

Key Specifications

Pinout & Package

STM32C071KBU6N is housed in a UFQFPN32 (5 × 5 mm) package with 32 leads and an exposed thermal pad. Pin functions are defined per ST's DS14693 Rev 2, Section 4 (Pinouts, pin description and alternate functions).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with STM32C031K6U6, the STM32C071KBU6N adds USB FS and doubles memory; versus STM32G071KBU6, it trades minor CPU efficiency for enhanced security features (securable flash) and broader temperature qualification (125°C vs 105°C).

Availability

STM32C071KBU6N is available at Aetrix Electronics and suitable for industrial sensor nodes, USB-capable edge controllers, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and ECOPACK2-compliant packaging.

Supply support for STM32C071KBU6N includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, MEMS, and automotive semiconductors since 1987.

The STM32C0 series targets cost-sensitive, space-constrained applications demanding USB connectivity, extended temperature operation, and security - bridging entry-level Cortex-M0+ performance with industrial robustness.

FAQ

Does STM32C071KBU6N support USB device mode without an external crystal?

Yes. It integrates an internal 48 MHz HSI48 RC oscillator with clock recovery system, meeting USB Full-Speed timing accuracy (±0.25%) without requiring an external crystal. This is confirmed in DS14693 Rev 2 Section 3.9 and Table 41.

What is the maximum operating temperature for STM32C071KBU6N?

The device is rated for –40°C to 125°C ambient temperature, validated per DS14693 Rev 2 Section 5.3.1. This extends beyond standard industrial grade (–40°C to 85°C) and supports under-hood automotive and high-temperature industrial deployments.

How many 5 V-tolerant I/O pins does STM32C071KBU6N have?

All 61 general-purpose I/Os are 5 V-tolerant, as stated in the "Features" section of DS14693 Rev 2. This applies regardless of VDD voltage (2.0–3.6 V) and eliminates need for external level shifters when interfacing with legacy 5 V peripherals.

Is there hardware support for secure firmware updates on STM32C071KBU6N?

Yes. The device includes a user-configurable securable area within its 128 KB flash memory, enforced by readout protection (RDP) levels and hardware lock bits - enabling secure bootloader implementation and IP-protected firmware partitioning per Section 3.3.1 of DS14693 Rev 2.