STMicroelectronics STM32C071KBU6

Overview

STM32C071KBU6 from STMicroelectronics is an Arm® Cortex®-M0+ 32-bit 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 connectivity and secure firmware execution.

For engineers reviewing the STM32C071KBU6 datasheet, STM32C071KBU6 pinout, STM32C071KBU6 application, or STM32C071KBU6 equivalent, key selection criteria include USB FS crystal-less operation, 5 V-tolerant I/Os across 61 pins, programmable brownout reset, 48 MHz max CPU frequency, and support for Stop/Standby/Shutdown low-power modes with fast wake-up.

Technical Context

The STM32C071KBU6 integrates an Arm Cortex-M0+ core with MPU, enabling memory protection for secure code partitioning. It features dual clock domains: a 48 MHz HSI48 RC oscillator with clock recovery (±1%) for USB timing, and a 32 kHz LSE crystal oscillator with calibration for RTC accuracy.

Peripheral interconnect uses a hierarchical AHB/APB bus matrix supporting concurrent DMA transfers across 5-channel controller with flexible mapping. All 61 GPIOs are 5 V-tolerant and mappable to external interrupt vectors, enabling robust interfacing in mixed-voltage industrial systems.

Key Specifications

Pinout & Package

STM32C071KBU6 is housed in a UFQFPN32 (5 × 5 mm) package with 32-pin layout and exposed thermal pad. Pin functions support full peripheral remapping via alternate function registers.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32C031K6U6, the STM32C071KBU6 adds USB FS and doubles RAM; versus STM32G071GBU6, it trades cryptographic acceleration and higher clock speed for lower dynamic power and optimized cost in basic USB-connected edge nodes.

Availability

STM32C071KBU6 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart meter interfaces, motor control gateways, and IoT edge controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STM32C071KBU6 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, sensors, and analog devices for industrial, automotive, and consumer markets.

The STM32C0 series targets cost-sensitive, USB-enabled embedded applications demanding robustness, low power, and simplified bill-of-materials - with the C071 variant emphasizing integrated USB FS, wide I/O voltage tolerance, and extended temperature qualification.

FAQ

What is the maximum operating frequency of the STM32C071KBU6?

The STM32C071KBU6 operates at up to 48 MHz using its internal 48 MHz HSI48 RC oscillator with clock recovery, which meets USB Full-Speed timing requirements without an external crystal. External clock sources (HSE) up to 48 MHz are also supported, and the PLL is not present in this series.

Does the STM32C071KBU6 support debug interfaces?

Yes, it supports Serial Wire Debug (SWD) via dedicated SWDIO and SWCLK pins, enabling full JTAG-style debugging, flash programming, and real-time tracing. No SWO pin is available; trace output is not supported on this variant.

How many I/O pins are 5 V-tolerant on the STM32C071KBU6?

All 61 GPIOs on the STM32C071KBU6 are 5 V-tolerant, including those used for USB_DP/DM, USART, I2C, SPI, and ADC inputs. This eliminates the need for external level-shifting circuitry when interfacing with 5 V peripherals or legacy industrial buses.

What low-power modes does the STM32C071KBU6 support?

It supports Sleep, Stop, Standby, and Shutdown modes. Shutdown mode draws just 1.2 µA (typical) with RTC and backup registers retained. Wake-up from Stop mode takes ≤5 µs via EXTI or RTC alarm, enabling rapid response in event-driven sensor applications.