STMicroelectronics STM32F303VBT6

Overview

STM32F303VBT6 from STMicroelectronics is an Arm® Cortex®-M4 32-bit MCU 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 (0.20 µs conversion), two 12-bit DACs, seven rail-to-rail comparators, and four programmable operational amplifiers. It integrates CAN 2.0B, USB 2.0 FS, five USART/UARTs, three SPIs (two with I2S), and capacitive touch sensing - deployed in industrial motor control and analog-sensor signal conditioning systems.

For engineers reviewing the STM32F303VBT6 datasheet, STM32F303VBT6 pinout, STM32F303VBT6 application, or STM32F303VBT6 equivalent, key selection criteria include its dual DAC + quad OPAMP analog subsystem, 72 MHz deterministic real-time performance with MPU, and LQFP100 package compatibility for high-channel-count mixed-signal embedded designs.

Technical Context

The device implements a tightly coupled Cortex-M4 core with single-cycle multiply, hardware divide, DSP extensions, and memory protection unit (MPU) for secure partitioning of code/data regions. Its analog subsystem includes dedicated VDDA/VREFOPAMP supplies (2.4–3.6 V) and independent calibration registers for each ADC/DAC channel.

Clock architecture supports multiple sources: 4–32 MHz HSE crystal, 32 kHz LSE for RTC, 8 MHz HSI with PLL (up to 72 MHz), and 40 kHz LSI for watchdogs. The interconnect matrix enables concurrent peripheral access without bus contention, critical for simultaneous ADC sampling, DAC output, and CAN messaging.

Key Specifications

Pinout & Package

LQFP100 (14 × 14 mm, 0.5 mm pitch) package with exposed thermal pad; 100-pin footprint supporting full peripheral mapping including all ADC inputs, DAC outputs, OPAMP terminals, CAN transceiver pins, and USB D+/D−.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F303RCT6, the VBT6 offers 36 additional pins and full TSC support for complex HMI; versus STM32F407VGT6, it trades clock speed for integrated analog signal chain components - reducing component count and board area in sensor-rich industrial edge nodes.

Availability

STM32F303VBT6 is available at Aetrix Electronics and suitable for industrial motor control, medical sensor signal conditioning, smart grid protection relays, and industrial HMI requiring stable component supply across extended production lifecycles.

Supply support for STM32F303VBT6 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 specializing in microcontrollers, power management, and analog/mixed-signal ICs for industrial, automotive, and consumer markets.

The STM32F3 series targets cost-sensitive, analog-intensive embedded applications - designed to integrate precision signal acquisition, real-time control, and communication in a single chip for industrial automation and portable instrumentation.

FAQ

What is the maximum operating frequency and how is it achieved?

The STM32F303VBT6 achieves 72 MHz via its internal PLL, which multiplies the 8 MHz HSI oscillator or an external 4–32 MHz crystal. The PLL supports fractional division and must be configured with appropriate wait states for Flash access; actual sustained performance depends on voltage (2.0–3.6 V) and temperature (–40°C to +85°C industrial grade).

Does this MCU support hardware encryption or secure boot?

No. The STM32F303VBT6 does not include hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. It relies on software-based security measures and external secure elements for authentication or encrypted firmware storage. For secure boot, designers must implement custom signature verification in user Flash.

Can the integrated OPAMPs be used as standalone amplifiers without PGA configuration?

Yes. Each of the four OPAMPs can operate in standard non-inverting/inverting configurations using external resistors, or as programmable-gain amplifiers (PGA) with internal resistor networks (1x, 2x, 4x, 8x, 16x). All terminals (VIN+, VIN−, VOUT) are accessible on dedicated pins, enabling both modes without reconfiguration.

What is the minimum supply voltage for reliable ADC operation?

The ADC requires VDDA ≥ 2.4 V for full 12-bit linearity and specified INL/DNL performance. At 2.0 V VDDA, resolution degrades to 10 bits with increased integral nonlinearity; the datasheet specifies guaranteed 12-bit operation only within 2.4–3.6 V VDDA range, aligned with DAC and OPAMP analog supply constraints.