STM32F303CBT6 - 32-bit ARM Cortex-M4 MCU, 256KB Flash | STMicroelectronics
MPN: STM32F303CBT6 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.85 | $58.50 |
| 100 | $5.2 | $520.00 |
| 500 | $4.68 | $2,340.00 |
| 1,000 | $4.16 | $4,160.00 |
STM32F303CBT6 Overview
What is a microcontroller? A microcontroller (MCU) is a compact integrated circuit containing a processor core, memory, and programmable input/output peripherals on a single chip. It is the brain of embedded systems, executing firmware to control devices, process sensor data, and communicate with other systems. MCUs are categorized by their core architecture (e.g., ARM Cortex-M), memory size, and peripheral set, and are fundamental to applications ranging from consumer electronics to industrial automation.
Key features of the STM32F303CBT6 include a 32-bit ARM Cortex-M4 core with FPU, 72 MHz maximum clock speed, 256 KB flash, 40 KB SRAM, and a rich set of analog peripherals: three 12-bit DACs, four 12-bit ADCs (up to 5 MSPS), seven fast comparators, and operational amplifiers. It also provides advanced timers, a 12-channel DMA controller, and multiple communication interfaces including I2C, SPI, USART, CAN, and USB. The device operates from 2.0V to 3.6V supply and over a -40Β°C to +85Β°C temperature range.
The STM32F303CBT6 leverages the ARM Cortex-M4 core with single-precision FPU and DSP instructions, enabling efficient execution of complex algorithms such as motor control, digital signal processing, and sensor fusion. The high-speed ADCs (5 MSPS) and fast comparators (25 ns) make it particularly suited for real-time control loops and power conversion applications.
Typical applications include motor control (field-oriented control of BLDC/PMSM motors), digital power conversion (SMPS, inverters), industrial automation (PLCs, sensors), medical devices (patient monitoring), and consumer electronics (audio processing, smart appliances). The combination of analog performance and digital processing capability allows designers to integrate multiple functions into a single MCU, reducing BOM cost and board space.
When designing with this device, ensure proper decoupling of the VDD and VDDA pins with 100 nF and 4.7 uF capacitors, and connect the VCAP pin to ground with a 2.2 uF capacitor. The BOOT0 pin configuration determines boot source; leave it pulled low for normal flash boot. For high-speed ADC operation, use a stable reference voltage on VREF+ and minimize noise on the analog supply.
Drop-in alternatives for STM32F303CBT6 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with STM32F303CBT6 (same form factor and footprint) β differing in Core, Flash Memory, SRAM, Operating Temperature Range, Timers.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
STM32F303CCT6
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$5.6 / Unit
View Datasheet βSTM32F303C8T6
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
STM32F303CBT6 Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M4 with FPU |
| Maximum Clock Speed | 72 MHz |
| Flash Memory | 256 KB |
| SRAM | 40 KB |
| Supply Voltage | 2.0 V to 3.6 V |
| Package | LQFP-48 (7x7 mm) |
| Operating Temperature | -40C to +85C |
| Number of I/O Pins | 37 |
| ADC Resolution | 12-bit |
| ADC Channels | 4 ADCs, up to 5 MSPS |
| DAC Resolution | 12-bit |
| DAC Channels | 3 |
| Comparators | 7 fast comparators |
| Operational Amplifiers | 4 |
| Communication Interfaces | I2C, SPI, USART, CAN, USB |
| DMA Channels | 12 |
| Timers | Advanced-control, general-purpose, basic |
| RoHS Status | Compliant |
STM32F303CBT6 Pin Configuration
| Pin 1 | VBAT β Battery backup supply |
| Pin 2 | PC13 β GPIO / RTC output |
| Pin 3 | PC14 β GPIO / OSC32_IN |
| Pin 4 | PC15 β GPIO / OSC32_OUT |
| Pin 5 | PF0 β GPIO / OSC_IN |
| Pin 6 | PF1 β GPIO / OSC_OUT |
| Pin 7 | NRST β Reset (active low) |
| Pin 8 | VSSA β Analog ground |
| Pin 9 | VDDA β Analog power supply |
| Pin 10 | PA0 β GPIO / ADC_IN0 / TIM2_CH1 |
| Pin 11 | PA1 β GPIO / ADC_IN1 / TIM2_CH2 |
| Pin 12 | PA2 β GPIO / ADC_IN2 / USART2_TX |
| Pin 13 | PA3 β GPIO / ADC_IN3 / USART2_RX |
| Pin 14 | PA4 β GPIO / DAC_OUT1 / SPI1_NSS |
| Pin 15 | PA5 β GPIO / DAC_OUT2 / SPI1_SCK |
| Pin 16 | PA6 β GPIO / DAC_OUT3 / SPI1_MISO |
| Pin 17 | PA7 β GPIO / SPI1_MOSI / TIM1_CH1N |
| Pin 18 | PB0 β GPIO / ADC_IN8 / TIM1_CH2N |
| Pin 19 | PB1 β GPIO / ADC_IN9 / TIM1_CH3N |
| Pin 20 | PB2 β GPIO / BOOT1 |
| Pin 21 | PB10 β GPIO / I2C2_SCL / USART3_TX |
| Pin 22 | PB11 β GPIO / I2C2_SDA / USART3_RX |
| Pin 23 | PB12 β GPIO / SPI2_NSS / CAN1_RX |
| Pin 24 | PB13 β GPIO / SPI2_SCK / CAN1_TX |
| Pin 25 | PB14 β GPIO / SPI2_MISO / TIM1_CH2N |
| Pin 26 | PB15 β GPIO / SPI2_MOSI / TIM1_CH3N |
| Pin 27 | PA8 β GPIO / TIM1_CH1 / USB_SOF |
| Pin 28 | PA9 β GPIO / USART1_TX / TIM1_CH2 |
| Pin 29 | PA10 β GPIO / USART1_RX / TIM1_CH3 |
| Pin 30 | PA11 β GPIO / USB_DM / CAN1_RX |
| Pin 31 | PA12 β GPIO / USB_DP / CAN1_TX |
| Pin 32 | PA13 β GPIO / SWDIO |
| Pin 33 | PA14 β GPIO / SWCLK |
| Pin 34 | PA15 β GPIO / JTDI / TIM2_CH1 |
| Pin 35 | PB3 β GPIO / JTDO / TIM2_CH2 |
| Pin 36 | PB4 β GPIO / NJTRST / TIM3_CH1 |
| Pin 37 | PB5 β GPIO / I2C1_SMBA / TIM3_CH2 |
| Pin 38 | PB6 β GPIO / I2C1_SCL / TIM4_CH1 |
| Pin 39 | PB7 β GPIO / I2C1_SDA / TIM4_CH2 |
| Pin 40 | BOOT0 β Boot mode selection |
| Pin 41 | PB8 β GPIO / CAN1_RX / TIM4_CH3 |
| Pin 42 | PB9 β GPIO / CAN1_TX / TIM4_CH4 |
| Pin 43 | VSS β Ground |
| Pin 44 | VDD β Power supply |
| Pin 45 | PC0 β GPIO / ADC_IN10 |
| Pin 46 | PC1 β GPIO / ADC_IN11 |
| Pin 47 | PC2 β GPIO / ADC_IN12 |
| Pin 48 | PC3 β GPIO / ADC_IN13 |
Typical Applications
STM32F303CBT6 is suitable for 6 applications: Motor Control, Digital Power Conversion, Industrial Automation, Medical Devices, Consumer Electronics, IoT and Smart Home.
Motor Control
The STM32F303CBT6 is ideal for field-oriented control (FOC) of BLDC and PMSM motors. Its high-speed ADCs (5 MSPS) and fast comparators (25 ns) enable precise current sensing and real-time control loops. The advanced timers generate PWM signals with dead-time insertion, while the FPU accelerates complex algorithms. In a typical motor drive, the MCU reads phase currents via shunt resistors, processes them through Clarke/Park transforms, and outputs PWM to the inverter. The integrated op-amps can condition current sensor signals, reducing external components. Compared to general-purpose MCUs, the F303's analog performance allows higher bandwidth control, improving efficiency and torque ripple. Designers must ensure proper isolation and gate driver circuitry for high-voltage applications.
Recommended
Digital Power Conversion
The STM32F303CBT6 excels in digital power conversion, such as SMPS and inverters. Its high-speed ADCs (5 MSPS) and fast comparators enable digital control loops with high bandwidth. The advanced timers can generate complementary PWM with programmable dead-time, essential for half-bridge and full-bridge topologies. The FPU accelerates PID control algorithms, allowing real-time voltage and current regulation. In a typical SMPS, the MCU samples output voltage and inductor current, computes duty cycle, and updates PWM in real-time. The integrated DACs can provide reference voltages for analog comparators. Compared to analog controllers, digital control offers flexibility, adaptability, and monitoring capabilities. Designers must consider ADC sampling synchronization with PWM to minimize noise and ensure stability.
Recommended
Industrial Automation
The STM32F303CBT6 is well-suited for industrial automation, including PLCs, sensors, and actuators. Its multiple communication interfaces (CAN, USART, SPI, I2C) enable connectivity to fieldbuses and sensors. The 12-bit ADCs and DACs interface with analog sensors and actuators. The device's robust design operates over -40Β°C to +85Β°C, suitable for harsh environments. In a typical PLC, the MCU reads digital inputs, executes ladder logic, and drives outputs. The high-speed ADCs can sample analog sensors for process control. The FPU accelerates mathematical operations for control algorithms. Compared to 8-bit MCUs, the F303 offers higher performance and memory for complex automation tasks. Designers must ensure proper isolation and EMC protection for industrial environments.
Recommended
Medical Devices
The STM32F303CBT6 is used in medical devices such as patient monitors, infusion pumps, and diagnostic equipment. Its high-performance analog peripherals enable precise sensor signal conditioning. The low-power modes help extend battery life in portable devices. The device's reliability and long-term availability are critical for medical applications. In a typical patient monitor, the MCU reads ECG, SpO2, and temperature sensors, processes the signals, and displays results. The high-speed ADCs capture fast biosignals, while the FPU processes filtering algorithms. The integrated op-amps can amplify weak sensor signals. Compared to general-purpose MCUs, the F303's analog integration reduces component count and board space. Designers must follow medical safety standards and ensure proper isolation for patient-connected circuits.
Recommended
Consumer Electronics
The STM32F303CBT6 is used in consumer electronics such as smart appliances, audio devices, and gaming peripherals. Its rich peripheral set and low cost make it attractive for high-volume products. The USB interface enables connectivity to PCs and chargers. The FPU accelerates audio processing algorithms. In a typical smart appliance, the MCU controls user interface, sensors, and actuators. The high-speed ADCs sample touch sensors and environmental sensors. The DACs can generate audio signals. Compared to dedicated audio DSPs, the F303 offers a cost-effective solution with integrated analog peripherals. Designers must consider power consumption and EMI for consumer products.
Recommended
IoT and Smart Home
The STM32F303CBT6 is suitable for IoT and smart home devices, such as smart sensors, gateways, and actuators. Its low-power modes and communication interfaces enable battery-powered operation and connectivity. The device can interface with Wi-Fi, Bluetooth, and Zigbee modules via SPI or UART. In a typical smart sensor, the MCU reads environmental sensors, processes data, and transmits it wirelessly. The high-speed ADCs sample sensor outputs, while the FPU processes calibration algorithms. The device's small package (LQFP-48) fits compact designs. Compared to application processors, the F303 offers lower power consumption and cost. Designers must optimize power consumption using sleep modes and efficient communication protocols.
Recommended
Recommended Products Summary
Engineering reference data for STM32F303CBT6 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM32F303CCT6 | STM32F303RBT6 | STM32F303VBT6 | STM32F303C8T6 |
|---|---|---|---|---|---|
| Package | LQFP-48 | LQFP-48 (same) | LQFP-64 (different) | LQFP-100 (different) | LQFP-48 (same) |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Flash Memory | 256 KB | 256 KB | 128 KB | 128 KB | 64 KB |
| SRAM | 40 KB | 48 KB | 32 KB | 32 KB | 16 KB |
| Number of I/O Pins | 37 | 37 | 51 | 82 | 37 |
| ADC Speed | 5 MSPS | 5 MSPS | 5 MSPS | 5 MSPS | 5 MSPS |
| DAC Channels | 3 | 3 | 2 | 2 | 2 |
| Comparators | 7 | 7 | 7 | 7 | 7 |
Key Differentiators
- High-speed ADCs (5 MSPS) with 4 ADCs (vs STM32F103CBT6)
- Integrated op-amps and comparators (vs STM32F103CBT6)
- 3 DAC channels (vs STM32F303C8T6)
Design Notes
Decouple the VDD and VDDA pins with 100 nF and 4.7 uF capacitors placed as close to the pins as possible. Connect the VCAP pin to ground with a 2.2 uF capacitor. For ADC accuracy, use a stable reference voltage on VREF+ and minimize noise on the analog supply.
For high-speed ADC operation (5 MSPS), ensure a clean analog ground plane and separate analog and digital grounds. Place the crystal oscillator close to the OSC_IN/OSC_OUT pins with proper load capacitors. Use series resistors on high-speed communication lines (SPI, USART) to reduce EMI.
Ensure the BOOT0 pin is pulled low for normal flash boot. Do not leave the NRST pin floating; connect a 100 nF capacitor to ground. For USB applications, add proper pull-up resistors on the USB_DP pin and ensure a stable 3.3V supply.
Compliance Information
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified (not intended for automotive).
