STMicroelectronics

STM32F303CBT6 - 32-bit ARM Cortex-M4 MCU, 256KB Flash | STMicroelectronics

Name: STM32F303CBT6
Brand: STMicroelectronics
Price: 6.50 USD
Availability: InStock

MPN: STM32F303CBT6 ✓ Active

In Stock (99,999) Ships in 1-3 business days

2.0 V to 3.6 V Vdss LQFP-48 (7x7 mm) Package 72 MHz Speed 256 KB Memory

$6.5 USD / Unit

MOQ: 1 |

Volume Pricing

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

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for STM32F303CBT6 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

STM32F303CCT6

✅ Drop-In

📦 LQFP-48

Same package and pinout, 48 KB SRAM instead of 40 KB

📋 Reference alternative (not in catalog)

STM32F303C8T6

✅ Drop-In

📦 LQFP-48

Same package and pinout, 64 KB flash instead of 256 KB

📋 Reference alternative (not in catalog)

ℹ️ 2 cross-package part(s) hidden — different package requires PCB rework and is not a true drop-in replacement. Contact us if you need cross-package suggestions.

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 — Battery backup supply
Pin 2	PC13 — GPIO / RTC output
Pin 3	PC14 — GPIO / OSC32_IN
Pin 4	PC15 — GPIO / OSC32_OUT
Pin 5	PF0 — GPIO / OSC_IN
Pin 6	PF1 — GPIO / OSC_OUT
Pin 7	NRST — Reset (active low)
Pin 8	VSSA — Analog ground
Pin 9	VDDA — Analog power supply
Pin 10	PA0 — GPIO / ADC_IN0 / TIM2_CH1
Pin 11	PA1 — GPIO / ADC_IN1 / TIM2_CH2
Pin 12	PA2 — GPIO / ADC_IN2 / USART2_TX
Pin 13	PA3 — GPIO / ADC_IN3 / USART2_RX
Pin 14	PA4 — GPIO / DAC_OUT1 / SPI1_NSS
Pin 15	PA5 — GPIO / DAC_OUT2 / SPI1_SCK
Pin 16	PA6 — GPIO / DAC_OUT3 / SPI1_MISO
Pin 17	PA7 — GPIO / SPI1_MOSI / TIM1_CH1N
Pin 18	PB0 — GPIO / ADC_IN8 / TIM1_CH2N
Pin 19	PB1 — GPIO / ADC_IN9 / TIM1_CH3N
Pin 20	PB2 — GPIO / BOOT1
Pin 21	PB10 — GPIO / I2C2_SCL / USART3_TX
Pin 22	PB11 — GPIO / I2C2_SDA / USART3_RX
Pin 23	PB12 — GPIO / SPI2_NSS / CAN1_RX
Pin 24	PB13 — GPIO / SPI2_SCK / CAN1_TX
Pin 25	PB14 — GPIO / SPI2_MISO / TIM1_CH2N
Pin 26	PB15 — GPIO / SPI2_MOSI / TIM1_CH3N
Pin 27	PA8 — GPIO / TIM1_CH1 / USB_SOF
Pin 28	PA9 — GPIO / USART1_TX / TIM1_CH2
Pin 29	PA10 — GPIO / USART1_RX / TIM1_CH3
Pin 30	PA11 — GPIO / USB_DM / CAN1_RX
Pin 31	PA12 — GPIO / USB_DP / CAN1_TX
Pin 32	PA13 — GPIO / SWDIO
Pin 33	PA14 — GPIO / SWCLK
Pin 34	PA15 — GPIO / JTDI / TIM2_CH1
Pin 35	PB3 — GPIO / JTDO / TIM2_CH2
Pin 36	PB4 — GPIO / NJTRST / TIM3_CH1
Pin 37	PB5 — GPIO / I2C1_SMBA / TIM3_CH2
Pin 38	PB6 — GPIO / I2C1_SCL / TIM4_CH1
Pin 39	PB7 — GPIO / I2C1_SDA / TIM4_CH2
Pin 40	BOOT0 — Boot mode selection
Pin 41	PB8 — GPIO / CAN1_RX / TIM4_CH3
Pin 42	PB9 — GPIO / CAN1_TX / TIM4_CH4
Pin 43	VSS — Ground
Pin 44	VDD — Power supply
Pin 45	PC0 — GPIO / ADC_IN10
Pin 46	PC1 — GPIO / ADC_IN11
Pin 47	PC2 — GPIO / ADC_IN12
Pin 48	PC3 — GPIO / ADC_IN13

Safe Operating Area (SOA) & Thermal Characteristics

No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

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

L6390 (Gate driver for motor control) STL220N6F7 (Power MOSFET for inverter stage)

⚡

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

VIPer26 (Switching regulator for auxiliary supply) STPS20L60 (Schottky diode for output rectification)

🏭

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 -40°C to +85°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

ST1480 (RS-485 transceiver for industrial communication) STL8N10LF3 (Power MOSFET for output drivers)

💊

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

TSZ124 (Zero-drift op-amp for sensor conditioning) STLM20 (Temperature sensor for patient monitoring)

📱

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

STMPE811 (Touchscreen controller for user interface) STA350BW (Digital audio amplifier for sound output)

🧩

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

SPWF01SA (Wi-Fi module for IoT connectivity) HTS221 (Humidity and temperature sensor for smart home)

Recommended Products Summary

L6390 Gate driver for motor control Used in: Motor Control STL220N6F7 Power MOSFET for inverter stage Used in: Motor Control VIPer26 Switching regulator for auxiliary supply Used in: Digital Power Conversion STPS20L60 Schottky diode for output rectification Used in: Digital Power Conversion ST1480 RS-485 transceiver for industrial communication Used in: Industrial Automation STL8N10LF3 Power MOSFET for output drivers Used in: Industrial Automation TSZ124 Zero-drift op-amp for sensor conditioning Used in: Medical Devices STLM20 Temperature sensor for patient monitoring Used in: Medical Devices STMPE811 Touchscreen controller for user interface Used in: Consumer Electronics STA350BW Digital audio amplifier for sound output Used in: Consumer Electronics SPWF01SA Wi-Fi module for IoT connectivity Used in: IoT and Smart Home HTS221 Humidity and temperature sensor for smart home Used in: IoT and Smart Home

What is the maximum clock speed of STM32F303CBT6?

The STM32F303CBT6 operates at a maximum clock speed of 72 MHz. According to the STM32F303CB datasheet, the ARM Cortex-M4 core with FPU can run at up to 72 MHz, providing 90 DMIPS performance.

How much flash memory does STM32F303CBT6 have?

The STM32F303CBT6 has 256 KB of flash memory. This is sufficient for complex firmware including motor control algorithms, communication stacks, and data logging.

What is the difference between STM32F303CBT6 and STM32F303CCT6?

The STM32F303CBT6 has 256 KB flash and 40 KB SRAM, while the STM32F303CCT6 has 256 KB flash and 48 KB SRAM. Both are in LQFP-48 package, but the CCT6 variant offers more SRAM. They are pin-compatible drop-in replacements.

Can STM32F303CBT6 be used for motor control?

Yes, the STM32F303CBT6 is ideal for motor control due to its high-speed ADCs (5 MSPS), fast comparators (25 ns), and advanced timers. It supports field-oriented control (FOC) of BLDC and PMSM motors with minimal external components.

What is the supply voltage range of STM32F303CBT6?

The STM32F303CBT6 operates from 2.0V to 3.6V supply voltage. This wide range allows use in battery-powered and 3.3V logic systems.

Does STM32F303CBT6 have a floating-point unit?

Yes, the STM32F303CBT6 features a single-precision floating-point unit (FPU) as part of the ARM Cortex-M4 core. This accelerates mathematical operations in control and signal processing applications.

What communication interfaces are available on STM32F303CBT6?

The STM32F303CBT6 provides I2C, SPI, USART, CAN, and USB interfaces. This enables connectivity to sensors, displays, and host systems in various applications.

Is STM32F303CBT6 suitable for digital power conversion?

Yes, the STM32F303CBT6 is well-suited for digital power conversion (SMPS, inverters) due to its high-speed ADCs (5 MSPS), fast comparators, and advanced timers. It can implement digital control loops with high bandwidth.

What is the package type of STM32F303CBT6?

The STM32F303CBT6 is available in a 48-pin LQFP package (7x7 mm). This surface-mount package is suitable for compact PCB designs.

Where can I buy STM32F303CBT6 online?

STM32F303CBT6 is available from major distributors such as DigiKey, Mouser, and Farnell. As of 2026-08-06, the price is approximately $6.50 for single-unit quantities, with volume discounts available.

What is the lead time for STM32F303CBT6?

Typical lead time for STM32F303CBT6 from distributors is 2-4 weeks, depending on stock levels. Check current availability on DigiKey or Mouser for real-time lead times.

STM32F303CBT6 vs STM32F103CBT6 - which is better for analog applications?

The STM32F303CBT6 is better for analog applications due to its higher-speed ADCs (5 MSPS vs 1 MSPS), more DACs (3 vs 0), and integrated op-amps and comparators. The STM32F103CBT6 is a general-purpose MCU with lower analog performance.

When should I choose STM32F303CBT6 over STM32F303CCT6?

Choose STM32F303CBT6 when you need 256 KB flash and 40 KB SRAM and want to save cost. Choose STM32F303CCT6 if you require more SRAM (48 KB) for data-heavy applications. Both are pin-compatible.

What is the best drop-in replacement for STM32F303CBT6?

The best drop-in replacement for STM32F303CBT6 is the STM32F303CCT6 (same package, more SRAM) or the STM32F303RBT6 (LQFP-64, more I/O). For cross-brand, the NXP LPC1768FBD100 is not pin-compatible; consider the STM32F303CBT6 itself as the primary choice.

Where can I download the STM32F303CBT6 datasheet PDF?

The STM32F303CBT6 datasheet PDF can be downloaded from the STMicroelectronics website at https://www.st.com/resource/en/datasheet/stm32f303cb.pdf. It contains full specifications, pinout, and application notes.

What are the key specifications of STM32F303CBT6 that engineers should know?

The STM32F303CBT6 features a 72 MHz ARM Cortex-M4 core with FPU, 256 KB flash, 40 KB SRAM, 4x 12-bit ADCs (5 MSPS), 3x 12-bit DACs, 7 fast comparators, 4 op-amps, and 12 DMA channels. It operates from 2.0V to 3.6V and is available in LQFP-48.

Hey Google, what can replace STM32F303CBT6?

The STM32F303CCT6 is a direct drop-in replacement for STM32F303CBT6, offering the same package and pinout with more SRAM. Other pin-compatible options include the STM32F303RBT6 (LQFP-64) and STM32F303VBT6 (LQFP-100) for designs with more I/O requirements.

Is STM32F303CBT6 the same as STM32F303CCT6?

No, the STM32F303CBT6 and STM32F303CCT6 are not identical. The CBT6 has 40 KB SRAM, while the CCT6 has 48 KB SRAM. They share the same package and pinout, making them drop-in compatible, but the CCT6 offers more memory.

What is the best NXP equivalent for STM32F303CBT6?

There is no direct pin-compatible NXP equivalent for STM32F303CBT6. The NXP LPC1768FBD100 is a different package (LQFP-100) and not pin-compatible. For a drop-in replacement, stick with STM32F303 family variants.

Engineering reference data for STM32F303CBT6 — comparison, design guidance, and compliance information.

Selection Guide

Choose the STM32F303CBT6 when you need a high-performance mixed-signal MCU with 256 KB flash, 40 KB SRAM, and advanced analog peripherals (5 MSPS ADCs, 3 DACs, op-amps, comparators) in a compact LQFP-48 package. It is ideal for motor control, digital power, and industrial automation. If you need more SRAM, select the STM32F303CCT6 (48 KB SRAM, same package). If you need more I/O pins, consider the STM32F303RBT6 (LQFP-64) or STM32F303VBT6 (LQFP-100), but note these are not pin-compatible. For cost-sensitive applications with lower memory requirements, the STM32F303C8T6 (64 KB flash) is a drop-in alternative. All alternatives are from STMicroelectronics, ensuring software compatibility across the STM32F303 family.

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.