STMicroelectronics STM32F303RBT6TR

Overview

STM32F303RBT6TR 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), and integrated analog peripherals including four 12-bit ADCs, two 12-bit DACs, seven rail-to-rail comparators, and four operational amplifiers usable as programmable-gain amplifiers (PGAs). It targets motor control, digital power conversion, and industrial sensing systems requiring real-time signal processing and mixed-signal integration.

For engineers reviewing the STM32F303RBT6TR datasheet, STM32F303RBT6TR pinout, STM32F303RBT6TR application, or STM32F303RBT6TR equivalent, key selection criteria include its 72 MHz Cortex-M4+FPU core, dual 12-bit DACs with 2.4–3.6 V analog supply, 4-channel PGA capability, CAN 2.0B interface, and LQFP64 package with 51 GPIOs - all validated for deterministic timing in closed-loop control.

Technical Context

This MCU implements a tightly coupled interconnect matrix enabling concurrent access to Flash, SRAM, and peripherals without bus contention. Its analog subsystem integrates independent voltage domains: VDDA (2.0–3.6 V) for ADC/DAC/COMP and VREFOPAMP (2.4–3.6 V) for op-amps, supporting simultaneous high-precision acquisition and signal conditioning.

The timer architecture includes two 16-bit advanced-control timers (TIM1/TIM8) with 6-channel PWM, deadtime insertion, and emergency stop - directly supporting three-phase motor gate drive. A dedicated calendar RTC with alarm and periodic wakeup from Stop/Standby enables low-power timekeeping in battery-backed applications.

Key Specifications

Pinout & Package

LQFP64 package with exposed thermal pad; 64-pin quad flat lead frame, 10 × 10 mm body, 0.5 mm pitch. Pin 1 marked by dot or bevelled corner; recommended reflow profile per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F303K8T6, the STM32F303RBT6TR offers full analog feature parity (dual DAC, 4× PGA, 4× ADC) essential for closed-loop systems; versus STM32F334R8T6, it trades HRTIM for broader general-purpose analog integration - making it optimal for motor control where PGA flexibility outweighs ultra-fine PWM resolution.

Availability

STM32F303RBT6TR is available at Aetrix Electronics and suitable for motor control systems, digital power converters, industrial sensor nodes, and human-machine interfaces requiring stable component supply across long production lifecycles.

Supply support for STM32F303RBT6TR 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, sensors, and analog devices for industrial, automotive, and consumer markets.

The STM32F3 series targets cost-sensitive, performance-critical embedded applications demanding rich analog integration and real-time responsiveness - specifically engineered for motor control, digital power, and intelligent sensing where mixed-signal convergence reduces system BOM and PCB complexity.

FAQ

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

The STM32F303RBT6TR achieves a maximum CPU frequency of 72 MHz using its internal 8 MHz RC oscillator multiplied by a programmable PLL with pre-divider and multiplier stages. The PLL input clock can also be sourced from an external 4–32 MHz crystal oscillator. This frequency is sustained across the full industrial temperature range (–40°C to +85°C) under 2.0–3.6 V supply conditions, with all peripherals fully functional and timing specifications guaranteed per datasheet Table 6.3.3.

Does this MCU support hardware CRC calculation and why does it matter?

Yes, it includes a dedicated CRC calculation unit compliant with IEEE-802.3 (32-bit polynomial 0x04C11DB7). This enables real-time checksum generation for firmware images, configuration data, or communication payloads without CPU overhead - critical for ensuring data integrity in OTA updates, secure boot validation, and CAN message error detection in safety-relevant industrial networks.

How many analog supply domains does it have and what are their voltage ranges?

The MCU has two distinct analog supply domains: VDDA (2.0–3.6 V) powers the ADCs, DACs, comparators, and temperature sensor; VREFOPAMP (2.4–3.6 V) supplies the four operational amplifiers. These domains must be independently decoupled and filtered. VDDA stability directly impacts ADC/DAC INL/DNL and comparator propagation delay; VREFOPAMP range defines the usable gain and output swing of the PGAs.

Can the op-amps be used in standalone mode or only as PGAs?

All four op-amps can operate in standard unity-gain buffer, inverting/non-inverting amplifier, or comparator modes - not limited to PGA configuration. Each op-amp's inputs and outputs are accessible on dedicated GPIOs (e.g., PA4–PA7 for OPAMP1–OPAMP4), allowing flexible circuit design. PGA mode is enabled via internal resistor ladder configuration; standalone use requires external feedback networks connected to those same pins.