STMicroelectronics STM32F103C8T7TR

Overview

STM32F103C8T7TR from STMicroelectronics is a medium-density performance-line Arm® Cortex®-M3 microcontroller featuring 64 KB Flash, 20 KB SRAM, 72 MHz CPU frequency, USB 2.0 full-speed interface, and CAN 2.0B Active support. It integrates dual 12-bit ADCs (1 µs conversion), seven timers including motor-control PWM with dead-time generation, and operates across 2.0–3.6 V supply for industrial sensor nodes and motor control edge devices.

For engineers reviewing the STM32F103C8T7TR datasheet, STM32F103C8T7TR pinout, STM32F103C8T7TR application, or STM32F103C8T7TR equivalent, key selection criteria include Flash/SRAM capacity, USB+CAN coexistence, 48-pin LQFP package compatibility, and real-time peripheral count (e.g., 3× USART, 2× I²C, 2× SPI) for embedded gateway designs.

Technical Context

The STM32F103C8T7TR implements an Arm Cortex-M3 core with Harvard architecture, single-cycle multiplication, hardware divide, and nested vectored interrupt controller (NVIC) supporting up to 68 interrupts. Its clock system combines 4–16 MHz external crystal, 8 MHz internal RC, 40 kHz low-power RC, and PLL for deterministic 72 MHz operation with ±1% accuracy over temperature.

DMA controller features 7 channels servicing ADC, timers, USART, SPI, and I²C-enabling zero-CPU-overhead data transfers. The device supports three low-power modes (Sleep, Stop, Standby) with VBAT-backed RTC and backup registers, and includes CRC calculation unit plus 96-bit unique ID for firmware integrity and device authentication.

Key Specifications

Pinout & Package

STM32F103C8T7TR uses a 48-pin LQFP package (7 × 7 mm, 0.5 mm pitch) with ECOPACK® RoHS-compliant finish. All I/Os are 5 V-tolerant and mappable to 16 external interrupt vectors.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F103C8T6, the T7TR offers guaranteed operation up to +105°C for harsh environments; versus STM32F072CBT6, it delivers higher compute throughput, CAN capability, and dedicated motor-control peripherals essential for real-time industrial control.

Availability

STM32F103C8T7TR is available at Aetrix Electronics and suitable for industrial motor control, USB-CAN bridge devices, and smart sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STM32F103C8T7TR 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, specializing in microcontrollers, power management, MEMS, and automotive ICs with vertical manufacturing and broad IP portfolio.

The STM32F1 series targets cost-sensitive, high-integration embedded applications demanding ARM Cortex-M3 performance, rich analog/mixed-signal peripherals, and industrial-grade reliability in compact packages.

FAQ

What is the maximum operating temperature rating for STM32F103C8T7TR?

The STM32F103C8T7TR is qualified for operation from –40°C to +105°C ambient temperature, verified per ST's industrial temperature grade specification (documented in DS5319 Rev 20, Section 5.3.1). This exceeds the standard –40°C to +85°C range of the T6 variant, making it suitable for enclosed industrial enclosures or automotive under-dash locations.

Does STM32F103C8T7TR support USB host functionality?

No, the STM32F103C8T7TR implements only USB 2.0 full-speed device-mode functionality (CDC, HID, MSC classes). It lacks USB OTG hardware, on-chip PHY host capabilities, or VBUS sensing circuitry required for host operation. External USB host controllers or higher-tier STM32 OTG-capable parts (e.g., STM32F407) are required for host roles.

Can the internal 8 MHz RC oscillator be used as system clock without external crystal?

Yes, the factory-trimmed 8 MHz internal RC oscillator can serve as the system clock source, achieving ±1% accuracy across temperature and voltage. However, USB and CAN require precise clock sources: USB needs ±0.25% tolerance (achieved only with external 8 MHz crystal + PLL), and CAN requires ≤±1.58% (achievable with internal RC at lower bit rates, but external crystal recommended for 1 Mbps compliance).

How many ADC channels are accessible on the 48-pin LQFP package?

The STM32F103C8T7TR in LQFP48 exposes 10 ADC input channels: ADC1_IN0 through ADC1_IN9 on pins PA0–PA7, PB0, and PB1. Channels ADC1_IN10–ADC1_IN15 are not bonded out in this package variant, as confirmed by Table 5 (Medium-density pin definitions) and Figure 8 (LQFP48 pinout) in DS5319 Rev 20.