STMicroelectronics STM32C071CBU6N

Overview

STM32C071CBU6N 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, smart metering front-ends, and USB-connected embedded control systems.

For engineers reviewing the STM32C071CBU6N datasheet, STM32C071CBU6N pinout, STM32C071CBU6N application, or STM32C071CBU6N equivalent, key selection criteria include USB FS crystal-less operation, 5 V-tolerant GPIOs, 48 MHz max CPU frequency, -40°C to 125°C extended temperature grade, and ECOPACK2-compliant UFQFPN48 packaging.

Technical Context

The STM32C071CBU6N integrates an Arm Cortex-M0+ core with MPU, hardware parity-checked SRAM, securable flash area, and a CRC calculation unit. It supports multiple clock sources including 4–48 MHz HSE, 32 kHz LSE with calibration, and ±1% internal 48 MHz HSI48 oscillator with clock recovery for USB timing.

Its peripheral interconnect enables flexible routing of DMA requests across 5-channel DMA controller and DMAMUX, while advanced timer features include one 16-bit advanced-control timer (TIM1) for motor control and four 16-bit general-purpose timers with complementary outputs and dead-time insertion.

Key Specifications

Pinout & Package

STM32C071CBU6N uses the UFQFPN48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad, compliant with ECOPACK2 environmental standards. 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 STM32C031C6U6, the STM32C071CBU6N adds USB FS and doubles memory; versus STM32G071CBT6, it trades 16 MHz CPU headroom and extra analog resources for lower cost and identical footprint - making it optimal for USB-peripheral control where 48 MHz suffices.

Availability

STM32C071CBU6N is available at Aetrix Electronics and suitable for industrial sensor nodes, smart energy meter front-ends, and USB human interface devices requiring stable component supply across long-lifecycle production programs.

Supply support for STM32C071CBU6N 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 products for industrial, automotive, and consumer markets.

The STM32C0 series targets cost-sensitive, high-volume embedded applications demanding USB connectivity, extended temperature operation, and robust security - bridging entry-level Cortex-M0+ performance with production-ready reliability.

FAQ

Does STM32C071CBU6N support crystal-less USB operation?

Yes. The device integrates a 48 MHz HSI48 oscillator with clock recovery system, enabling full USB 2.0 Full-Speed device functionality without an external crystal. This is confirmed in DS14693 Rev 2 Section 3.9 and Table 41 (HSI48 oscillator characteristics), where ±1% accuracy and USB-specific calibration are specified.

What is the maximum operating temperature grade for STM32C071CBU6N?

The STM32C071CBU6N is rated for -40°C to +125°C ambient operation, as stated in the "Features" section of DS14693 Rev 2 and verified in Section 5.3.1 (General operating conditions). This extended grade applies to all packages in the C071xB family, including the UFQFPN48 variant.

How many 5 V-tolerant I/Os does STM32C071CBU6N have?

All 61 GPIOs are 5 V-tolerant, per DS14693 Rev 2 Section 3.10 ("General-purpose inputs/outputs") and Table 12 (Pin assignment and description). This includes PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD2, and PF0–PF1 - enabling direct interfacing with 5 V logic without external level shifters.

Is the STM32C071CBU6N pin-compatible with other STM32C071x variants in UFQFPN48?

Yes. STM32C071CBU6N shares identical pinout and electrical characteristics with all STM32C071xB-series devices in UFQFPN48 (e.g., STM32C071RBT6, STM32C071KBU6), as defined in Table 1 and Section 6.7 (LQFP48/UFQFPN48 mechanical data) of DS14693 Rev 2 - enabling drop-in replacement within the same package variant.