STMicroelectronics STM32F103CBT6

Overview

STM32F103CBT6 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 controller - deployed in industrial motor control, smart sensor hubs, and embedded HMI systems.

For engineers reviewing the STM32F103CBT6 datasheet, STM32F103CBT6 pinout, STM32F103CBT6 application, or STM32F103CBT6 equivalent, key selection criteria include its 48-pin LQFP package, dual 12-bit ADCs with temperature sensor, 7 timers (including motor-control PWM), and dual I²C/USART/SPI interfaces supporting real-time fieldbus integration.

Technical Context

The STM32F103CBT6 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 integrates 4–16 MHz external crystal, 8 MHz internal RC, 40 kHz LSI, PLL for 72 MHz system clock, and 32 kHz RTC oscillator with calibration.

Peripheral subsystems include two 12-bit, 1 µs ADCs (16-channel total, dual-sample-and-hold), seven DMA channels servicing timers/ADC/USART/I²C/SPI, and nine communication interfaces: two I²C (SMBus/PMBus), three USART (LIN/IrDA/ISO 7816), two SPI (18 Mbit/s), one CAN 2.0B, and one USB 2.0 full-speed device interface.

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch), ECOPACK®-compliant, with exposed thermal pad (pin 48 = VSS). Pin count and I/O mapping align with STM32F103xB series pin compatibility across 48-pin variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F103CBT6, the C8T6 offers lower memory capacity but identical peripheral set for budget designs, while the F303CBT6 adds FPU and analog enhancements at higher cost and power - making the F103CBT6 optimal for balanced real-time control where integer math and 12-bit sensing suffice.

Availability

STM32F103CBT6 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, automotive body electronics, and human-machine interface applications requiring stable component supply across long-life production cycles.

Supply support for STM32F103CBT6 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 management ICs, MEMS, and automotive-grade silicon since 1987.

The STM32F103xB series targets cost-sensitive, high-reliability embedded applications demanding rich analog/peripheral integration and industrial temperature range (–40°C to +85°C) without sacrificing real-time responsiveness.

FAQ

What is the maximum operating frequency and associated power consumption in Run mode?

The STM32F103CBT6 achieves 72 MHz CPU frequency with zero wait-state Flash access. At 3.3 V and 72 MHz, typical active current is 36 mA with all peripherals enabled, rising to 42 mA at 3.6 V per datasheet Table 13. This enables deterministic real-time response while maintaining thermal headroom in compact enclosures.

Does the device support hardware-based USB device enumeration without external components?

Yes - the STM32F103CBT6 integrates a full-speed USB 2.0 device PHY. Only a 1.5 kΩ pull-up resistor on PA12 (USB_DP) is required for enumeration; no external transceiver or crystal is needed, as the USB clock is derived from the internal PLL.

How many ADC channels can be sampled simultaneously, and what is the minimum conversion time?

Two independent 12-bit ADCs support true simultaneous sampling on up to 16 total channels (ADC1: 16 channels; ADC2: 14 channels). Minimum conversion time is 1 µs per sample, and dual-sample-and-hold allows synchronized capture of voltage and current in motor phase legs.

Is the LQFP48 package RoHS-compliant and lead-free?

Yes - the STM32F103CBT6 in LQFP48 (package code 5B) is RoHS-compliant and lead-free, meeting EU Directive 2011/65/EU. It carries ST's ECOPACK® designation, confirming halogen-free materials and compliant manufacturing processes.