STMicroelectronics STM32F103CBT7

Overview

STM32F103CBT7 from STMicroelectronics is a medium-density performance-line Arm® Cortex®-M3 microcontroller featuring 128 KB Flash, 20 KB SRAM, 72 MHz CPU frequency, USB 2.0 full-speed interface, and CAN 2.0B Active controller - deployed in industrial motor control, PLC I/O modules, and embedded HMI systems.

For engineers reviewing the STM32F103CBT7 datasheet, STM32F103CBT7 pinout, STM32F103CBT7 application, or STM32F103CBT7 equivalent, key selection criteria include Flash/SRAM capacity, USB+CAN dual-interface support, 12-bit ADC timing accuracy, and LQFP48 package compatibility with legacy PCB footprints.

Technical Context

The STM32F103CBT7 implements a tightly coupled Arm Cortex-M3 core with Harvard bus architecture, supporting single-cycle multiplication and hardware division. Its clock system integrates a 4–16 MHz external crystal oscillator, 8 MHz factory-trimmed internal RC, and PLL for precise 72 MHz system clock generation.

Peripheral integration includes two 12-bit, 1 µs ADCs (16-channel total) with dual-sample-and-hold and integrated temperature sensor, plus seven timers - three general-purpose 16-bit timers, one advanced motor-control timer with dead-time generation, and two watchdogs (independent + window).

Key Specifications

Pinout & Package

LQFP48 package: 48-pin quad flat pack with exposed thermal pad, RoHS-compliant ECOPACK® construction, operating junction temperature range –40°C to +85°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F103C8T6, the STM32F103CBT7 provides 64 KB additional Flash for robust USB/CAN protocol stacks and firmware redundancy; versus STM32F072CBT6, it delivers deterministic 72 MHz M3 performance and hardware motor-control PWM essential for real-time drive applications.

Availability

STM32F103CBT7 is available at Aetrix Electronics and suitable for industrial motor control, PLC I/O modules, and embedded HMI requiring stable component supply across multi-year production cycles.

Supply support for STM32F103CBT7 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 automotive ICs with over 40 years of industrial-grade product heritage.

The STM32F103 series targets cost-sensitive, high-reliability embedded applications demanding rich analog/mixed-signal integration, real-time responsiveness, and industrial temperature operation.

FAQ

What is the maximum operating temperature for the STM32F103CBT7?

The STM32F103CBT7 is rated for industrial temperature range: –40°C to +85°C ambient. Junction temperature must not exceed +125°C under continuous operation; thermal design should maintain θ_JA ≤ 45°C/W per LQFP48 package specifications in DS5319 Rev 20 Section 6.9.

Does the STM32F103CBT7 support USB device mode without external components?

Yes - the part integrates a full-speed USB 2.0 transceiver with internal pull-up resistors on D+ and requires only a single 1.5 kΩ external pull-up resistor for enumeration. No external PHY or level-shifting circuitry is needed for standard HID or CDC device-class implementations.

Can the internal temperature sensor be used for system thermal protection?

Yes - the calibrated temperature sensor outputs a voltage linearly proportional to die temperature (slope ≈ 4.3 mV/°C, offset ≈ 760 mV at 25°C). It is factory-trimmed and usable across the full –40°C to +85°C range with ±1.5°C accuracy, enabling overtemperature shutdown logic in firmware.

How many GPIO pins support external interrupts on the STM32F103CBT7?

All 37 GPIOs (PA0–PA15, PB0–PB15, PC13–PC15) are individually configurable for external interrupt generation via the EXTI controller. Each pin maps to one of 16 EXTI lines, with up to 4 pins sharing the same line through software-selectable edge detection (rising/falling/both).