STMicroelectronics STM32F303CBT6

Overview

STM32F303CBT6 from STMicroelectronics is an Arm® Cortex®-M4 32-bit microcontroller with FPU, operating up to 72 MHz, featuring 128 KB Flash, 40 KB SRAM (with HW parity on first 16 KB), four 12-bit ADCs (0.2 µs conversion), two 12-bit DACs, seven rail-to-rail comparators, and four programmable operational amplifiers - deployed in industrial motor control and analog-sensor signal conditioning systems.

For engineers reviewing the STM32F303CBT6 datasheet, STM32F303CBT6 pinout, STM32F303CBT6 application, or STM32F303CBT6 equivalent, key selection criteria include integrated analog front-end capability (PGA/OPAMP/COMP/DAC), CAN 2.0B interface support, capacitive touch sensing (24 channels), and dual-voltage domain operation (VDDA 2.4–3.6 V, VDD 2.0–3.6 V).

Technical Context

The device integrates a Cortex-M4 core with hardware floating-point unit and memory protection unit (MPU), enabling deterministic real-time execution of DSP-intensive algorithms such as field-oriented control (FOC) and sensor fusion. Its interconnect matrix decouples peripheral bus arbitration from CPU timing, supporting concurrent high-bandwidth analog acquisition and communication.

It implements a multi-domain power architecture: separate VDDA (2.4–3.6 V) for analog peripherals ensures noise immunity during simultaneous high-speed ADC sampling (up to 39 channels) and DAC output, while VDD (2.0–3.6 V) powers digital logic and I/Os - all coordinated via a programmable voltage detector (PVD) and POR/PDR circuitry.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; 64-pin quad flat lead frame optimized for mixed-signal PCB layout and thermal dissipation in compact industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F303RCT6, the CB variant trades memory headroom for cost-sensitive volume production; versus STM32G431KBT6, it retains CAN 2.0B at lower clock speed - making it optimal for CAN-based motor control where deterministic timing outweighs raw compute throughput.

Availability

STM32F303CBT6 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, human-machine interface panels, and CAN-based gateway modules requiring stable component supply across multi-year production cycles.

Supply support for STM32F303CBT6 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 components since 1987.

The STM32F3 series targets cost-sensitive, analog-rich embedded applications - emphasizing integrated signal conditioning, real-time control, and industrial interface support (CAN, USB, capacitive touch) in a single chip.

FAQ

What is the maximum operating frequency and associated power supply requirement?

The STM32F303CBT6 achieves 72 MHz maximum CPU frequency when powered by VDD within 2.7–3.6 V. At 2.0–2.6 V, maximum frequency is reduced to 48 MHz per electrical specifications. VDDA must be ≥2.4 V for full analog peripheral functionality (ADC/DAC/OPAMP), and both supplies require independent decoupling per datasheet Section 6.1.6.

Does this MCU support hardware CRC calculation and memory protection?

Yes - it includes a dedicated CRC calculation unit compliant with IEEE-802.3 polynomial (0x04C11DB7) for fast checksum generation on data buffers or firmware images. It also integrates a Memory Protection Unit (MPU) supporting eight regions with configurable access permissions (read/write/execute) and subregion disable, enabling RTOS-based memory isolation for safety-critical tasks.

How many analog-to-digital converters does the STM32F303CBT6 have, and what are their key timing characteristics?

It integrates four independent 12-bit ADCs. Each supports programmable resolution (6/8/10/12 bits), with minimum conversion time of 0.20 µs at 12-bit resolution and 72 MHz APB2 clock. All four ADCs can be triggered synchronously via TIM8 or TIM1, enabling simultaneous sampling across up to 39 channels - critical for three-phase current reconstruction in motor control.

Is the LQFP64 package RoHS-compliant and suitable for lead-free reflow soldering?

Yes - the STM32F303CBT6 in LQFP64 (part number suffix 'T6') is RoHS-compliant and qualified for lead-free reflow per JEDEC J-STD-020D. Peak reflow temperature is 260 °C (max), with moisture sensitivity level (MSL) 3. Recommended profile follows ST's AN5085 guidelines: preheat (150–200 °C), soak (180–200 °C), reflow (235–245 °C peak), cooling ramp ≤6 °C/s.