STMicroelectronics STM32F103C6T6ATR

Overview

STM32F103C6T6ATR 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 37 I/O pins in LQFP48 package for embedded control applications in industrial automation and motor drives.

For engineers reviewing the STM32F103C6T6ATR datasheet, STM32F103C6T6ATR pinout, STM32F103C6T6ATR application, or STM32F103C6T6ATR equivalent, key selection criteria include Flash/SRAM size, USB/CAN co-integration, 72 MHz real-time execution capability, and LQFP48 thermal performance for cost-sensitive industrial designs.

Technical Context

The device implements an ARM Cortex-M3 core with single-cycle multiplication, hardware division, and nested vectored interrupt controller (NVIC) supporting up to 68 interrupts. Its clock system integrates a 4–16 MHz external crystal oscillator, 8 MHz factory-trimmed RC, 40 kHz RC, PLL for CPU clock derivation, and 32 kHz RTC oscillator with calibration.

DMA operation uses a 7-channel controller servicing timers, ADC, SPI, I²C, and USART peripherals; low-power modes include Sleep, Stop, and Standby with VBAT support for RTC and backup registers. The 37 GPIOs are 5 V-tolerant and mappable to 16 external interrupt vectors.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with exposed pad for thermal dissipation; RoHS-compliant ECOPACK® construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F103C8T6, this part trades Flash headroom for lower unit cost and smaller code footprint; versus STM32F072CBT6, it delivers higher deterministic performance and fieldbus readiness at modest power premium.

Availability

STM32F103C6T6ATR is available at Aetrix Electronics and suitable for industrial PLC modules, motor drive controllers, energy meter communication hubs, and smart sensor nodes requiring stable component supply across multi-year production cycles.

Supply support for STM32F103C6T6ATR 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 devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The STM32F103x6 series targets cost-sensitive, real-time embedded control applications demanding USB and CAN in compact LQFP48 packages-optimized for industrial automation, motor control, and field instrumentation.

FAQ

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

The STM32F103C6T6ATR achieves 72 MHz CPU operation with 2.0–3.6 V supply voltage. Stable 72 MHz execution requires ≤10 ns Flash wait states (zero wait state at ≤24 MHz); above that, Flash latency must be configured per datasheet Table 9. Power supply ripple must stay within ±100 mV of nominal VDD to prevent clock instability.

Does this MCU support hardware encryption or secure boot features?

No. The STM32F103C6T6ATR lacks dedicated cryptographic accelerators, TRNG, or secure boot ROM. It does not implement ARM TrustZone or ST's proprietary secure firmware installation (SFI). Secure functionality requires external secure element or software-based AES libraries with careful key management.

Can the USB interface operate without an external crystal?

Yes. The USB 2.0 full-speed interface uses the internal 48 MHz PLL clock derived from the 8 MHz HSI or external 4–16 MHz crystal. No external 48 MHz crystal is required; however, USB compliance mandates ±0.25% clock accuracy, achievable only with external crystal (not HSI alone).

What is the minimum number of external components needed for basic operation?

Four: two 100 nF ceramic decoupling capacitors (VDD/VSS), one 100 nF capacitor on VCAP pin, and one 10 kΩ pull-up on NRST. External crystal (4–16 MHz) and load capacitors are optional if using internal 8 MHz RC oscillator, though not recommended for USB or precise timing.