STMicroelectronics STM32F303CBT7

Overview

STM32F303CBT7 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-gain 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, analog signal conditioning, and smart sensor nodes.

For engineers reviewing the STM32F303CBT7 datasheet, STM32F303CBT7 pinout, STM32F303CBT7 application, or STM32F303CBT7 equivalent, key selection criteria include its dual DAC + PGA + comparator analog subsystem, 72 MHz deterministic real-time performance with MPU, and LQFP48 package suitability for space-constrained embedded control designs requiring mixed-signal integration.

Technical Context

The STM32F303CBT7 implements a tightly coupled Cortex-M4 core with single-cycle multiply, hardware divide, and DSP extensions, supported by a memory protection unit (MPU) for secure task isolation. Its interconnect matrix enables concurrent peripheral access without bus contention, critical for real-time ADC sampling synchronized with PWM generation.

Analog subsystem coherency is enforced via shared VDDA (2.0–3.6 V) and dedicated reference paths: VREFINT for ADC/DAC calibration, VREFOPAMP for opamp gain stability, and separate 2.4–3.6 V supply for DACs and PGAs. The 24-channel capacitive sensing controller operates independently of CPU load using hardware-accelerated charge-transfer measurement.

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch) with exposed thermal pad; 48-pin quad flat configuration supporting industrial temperature range (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F303K8T6 and STM32F072CBT6, the STM32F303CBT7 uniquely combines Cortex-M4 FPU performance, dual DACs, four PGAs, and CAN+USB connectivity in LQFP48 - making it the only option among the three capable of closed-loop motor control with integrated analog signal synthesis and fieldbus communication.

Availability

STM32F303CBT7 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, medical instrumentation, and human-machine interface applications requiring stable component supply across extended production lifecycles.

Supply support for STM32F303CBT7 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, sensors, and automotive ICs, with manufacturing facilities across Europe, Asia, and North America.

The STM32F3 series targets cost-sensitive, analog-intensive embedded applications - designed to unify high-precision signal acquisition, real-time control, and connectivity in a single chip for industrial and consumer equipment.

FAQ

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

The STM32F303CBT7 achieves 72 MHz maximum CPU frequency when powered by VDD between 2.0 V and 3.6 V. At 3.6 V, typical active-mode current is 120 mA (Flash execution); voltage regulation must maintain VDDA within ±2% of VDD to ensure ADC/DAC linearity and comparator accuracy per datasheet Section 6.3.1.

Does the device support hardware-accelerated cryptographic operations?

No. The STM32F303CBT7 does not integrate a cryptographic processor or TRNG. It lacks AES, SHA, or PKA accelerators. Security relies on software libraries or external secure elements; however, its MPU supports memory region protection for basic firmware integrity enforcement.

Can the internal opamps be configured as standalone instrumentation amplifiers?

Yes. Each of the four opamps can be wired in programmable-gain amplifier (PGA) mode with gains from 1× to 100× using internal resistors. While not a monolithic instrumentation amplifier, cascading two opamps (one as diff-amp, one as PGA) achieves similar functionality with calibrated gain and offset trimming via factory-trimmed registers.

What debug interfaces are supported and what pins do they require?

The device supports Serial Wire Debug (SWD) using SWCLK (PA14) and SWDIO (PA13), plus JTAG (TCK, TMS, TDI, TDO, nTRST) - all share GPIO pins. SWD is recommended for minimal pin count; JTAG requires five pins but enables full ETM trace. No external pull-ups are needed as internal ones are enabled during reset.