STMicroelectronics STM32F103C6T7A

Overview

STM32F103C6T7A from STMicroelectronics is a low-density performance-line ARM Cortex-M3 microcontroller with 32 KB Flash, 10 KB SRAM, and integrated USB 2.0 full-speed and CAN 2.0B interfaces. It operates at up to 72 MHz, features two 12-bit ADCs (1 µs conversion), six timers including motor-control PWM with dead-time generation, and supports 51 I/Os - used in industrial sensor nodes requiring real-time control, fieldbus connectivity, and embedded USB device functionality.

For engineers reviewing the STM32F103C6T7A datasheet, STM32F103C6T7A pinout, STM32F103C6T7A application, or STM32F103C6T7A equivalent, key selection considerations include its 48-pin UFQFPN package, 32 KB Flash/10 KB SRAM memory configuration, USB+CAN dual-protocol capability, and support for -40°C to +85°C industrial temperature operation.

Technical Context

The STM32F103C6T7A implements an ARM Cortex-M3 core with Harvard architecture, single-cycle multiplication, and hardware divide, enabling deterministic real-time execution. Its clock system integrates a 4–16 MHz external crystal oscillator, 8 MHz factory-trimmed internal RC, and PLL for precise 72 MHz CPU clock derivation.

Peripheral integration includes a dual-channel 12-bit ADC with temperature sensor input and dual-sample-and-hold, a 7-channel DMA controller servicing USARTs, SPI, I²C, timers, and ADC, and dedicated CAN 2.0B controller with message filtering and FIFO buffering - all mapped to a unified AHB/APB bus matrix for low-latency peripheral access.

Key Specifications

Pinout & Package

STM32F103C6T7A is housed in a 48-pin UFQFPN (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad, supporting reflow soldering and compact PCB layouts for space-constrained embedded designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F103C8T6, the C6T7A trades memory capacity for lower cost and power in fixed-function devices; versus STM32F072CBT6, it provides essential CAN 2.0B support and deterministic Cortex-M3 execution - making it irreplaceable in hybrid USB/CAN industrial gateways.

Availability

STM32F103C6T7A is available at Aetrix Electronics and suitable for industrial PLC I/O modules, USB-CAN bridge adapters, and smart energy meter interfaces requiring stable component supply across extended product lifecycles.

Supply support for STM32F103C6T7A 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, specializing in microcontrollers, power management, and sensing technologies for industrial, automotive, and consumer markets.

The STM32F103x6 series targets cost-sensitive, real-time embedded applications demanding USB device capability, fieldbus connectivity (CAN), and deterministic control - optimized for factory automation, building controls, and portable instrumentation.

FAQ

What is the maximum operating frequency and associated power supply requirement?

The STM32F103C6T7A achieves 72 MHz CPU operation with a 2.0–3.6 V supply range. At 72 MHz, typical active current is 36 mA at 3.3 V (with all peripherals enabled), requiring proper decoupling (100 nF ceramic + 4.7 µF tantalum per VDD pin) and thermal derating above 70°C ambient.

Does this MCU support USB device functionality without external components?

Yes - the STM32F103C6T7A integrates a full-speed USB 2.0 transceiver with internal pull-up resistor control on PA12 (DP). Only a standard USB Type-A receptacle, ESD protection diodes, and 1.5 kΩ pull-up (enabled via software) are required; no external PHY or crystal is needed for basic CDC ACM operation.

How many ADC channels are accessible in the UFQFPN48 package, and what is their effective resolution?

In the UFQFPN48 package, 10 ADC input channels are physically accessible (PA0–PA7, PB0–PB1). The 12-bit ADC delivers ±1 LSB integral nonlinearity and 1 µs conversion time at 14 MHz ADC clock - achieving effective resolution >11.2 bits under typical noise conditions with proper PCB layout and reference decoupling.

Is the CAN interface compatible with ISO 11898-2 high-speed physical layer?

No - the STM32F103C6T7A contains only the CAN protocol controller (bxCAN), not the physical transceiver. It requires an external ISO 11898-2 compliant transceiver (e.g., TJA1050 or SN65HVD230) connected to PB8 (RX) and PB9 (TX) to achieve high-speed CAN bus operation up to 1 Mbit/s.