STMicroelectronics STM32C071CBU6

Overview

STM32C071CBU6 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 19 external channels - deployed in industrial sensor nodes requiring low-power connectivity and secure firmware execution.

For engineers reviewing the STM32C071CBU6 datasheet, STM32C071CBU6 pinout, STM32C071CBU6 application, or STM32C071CBU6 equivalent, key selection factors include its 48 MHz max CPU frequency, 5 V-tolerant I/Os, crystal-less USB FS capability, and support for multiple low-power modes (Stop/Standby/Shutdown) with sub-µA retention current.

Technical Context

The STM32C071CBU6 integrates an Arm Cortex-M0+ core with MPU, hardware parity-checked SRAM, and securable flash area for code protection. It features a multi-source clock system including 48 MHz HSI48 with clock recovery, 32 kHz LSE with calibration, and 4–48 MHz HSE oscillator support.

Peripheral interconnect is managed via AHB/APB buses with DMA controller (5 channels), flexible alternate function mapping across 61 GPIOs, and dedicated hardware blocks for USB FS device/host, RTC with calendar, and advanced timer (TIM1) for motor control.

Key Specifications

Pinout & Package

STM32C071CBU6 is housed in UFQFPN48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are validated per ST's DS14693 Rev 2, Section 4 (Pin assignment and description).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32G071CBU6 and STM32F071CBU6, the STM32C071CBU6 uniquely delivers crystal-less USB FS, extended temperature support (–40°C to 125°C), and enhanced security features (securable flash, ROP), making it optimal for next-gen industrial and automotive edge nodes where BOM cost, thermal resilience, and firmware protection are critical.

Availability

STM32C071CBU6 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart metering endpoints, automotive body control modules, and IoT edge gateway controllers requiring stable component supply across long-lifecycle deployments.

Supply support for STM32C071CBU6 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 management ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The STM32C0 series targets cost-sensitive, high-volume embedded applications demanding robustness, low power, and USB connectivity - specifically optimized for industrial automation, smart meters, and automotive ancillary systems.

FAQ

Does STM32C071CBU6 support USB device mode without an external crystal?

Yes. The STM32C071CBU6 integrates an HSI48 oscillator with clock recovery system that achieves ±0.25% accuracy for USB Full-Speed device operation, eliminating the need for an external 48 MHz crystal or trimming capacitor. This is confirmed in DS14693 Rev 2, Section 3.9 and Table 41.

What is the maximum number of 5 V-tolerant I/Os on STM32C071CBU6?

All 61 general-purpose I/Os are 5 V-tolerant when configured in input, output, or alternate function modes, as specified in DS14693 Rev 2, Section 3.10 and Table 51. This includes PA0–PA15, PB0–PB15, PC0–PC15, PD2, PF0–PF1, and PH0–PH1.

Can STM32C071CBU6 operate reliably at 125°C ambient temperature?

Yes. The device is qualified for operation from –40°C to 125°C (Grade 3), with validated electrical characteristics including flash read/write, SRAM retention, and USB timing accuracy across this full range, per DS14693 Rev 2, Section 5.3.1 and Table 24.

Is there hardware support for secure firmware updates on STM32C071CBU6?

Yes. The part includes Readout Protection (ROP) with three configurable levels, a securable flash area for protected bootloader code, and hardware CRC calculation unit - enabling authenticated and integrity-checked firmware updates, as detailed in DS14693 Rev 2, Sections 3.3.1 and 3.6.