STMicroelectronics STM32F103RFT6

Overview

STM32F103RFT6 from STMicroelectronics is a 32-bit ARM Cortex-M3 microcontroller in LQFP64 package, featuring 768 KB Flash, 96 KB SRAM, USB 2.0 full-speed interface, CAN 2.0B controller, and three 12-bit ADCs with 21 channels - deployed in industrial motor control systems requiring real-time PWM generation and analog signal acquisition.

For engineers reviewing the STM32F103RFT6 datasheet, STM32F103RFT6 pinout, STM32F103RFT6 application, or STM32F103RFT6 equivalent, key selection criteria include Flash size (768 KB), USB/CAN dual-interface capability, 72 MHz CPU clock, 112 I/O count (51 usable in LQFP64), and support for 3.3 V operation with 5 V-tolerant inputs.

Technical Context

The STM32F103RFT6 implements an ARM Cortex-M3 core with Memory Protection Unit (MPU), supporting deterministic interrupt handling via Nested Vectored Interrupt Controller (NVIC) and up to 16 external interrupt vectors mapped across its GPIO ports. It integrates a flexible static memory controller (FSMC) with four chip selects for NOR/PSRAM/NAND expansion and parallel LCD interface in 8080/6800 modes.

Clock architecture includes dual oscillators: 4–16 MHz external crystal and factory-trimmed 8 MHz internal RC, feeding a PLL that scales to 72 MHz; power management supports Sleep, Stop, and Standby modes with VBAT-backed RTC and backup registers, enabling low-power sensor node operation.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, ECOPACK® certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F103C8T6, the RFT6 offers 12× more Flash and integrated CAN/USB for fieldbus integration; versus STM32F401CCU6, it retains CAN and larger SRAM but lacks FPU - making it optimal for deterministic real-time control over compute-heavy signal processing.

Availability

STM32F103RFT6 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, USB-connected HMIs, and smart sensor nodes requiring stable component supply across extended production lifecycles.

Supply support for STM32F103RFT6 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 automotive-grade components.

The STM32F103 series belongs to ST's mainstream performance-line ARM Cortex-M3 portfolio, engineered for cost-effective, real-time embedded control in industrial automation, motor drives, and human-machine interfaces.

FAQ

What is the maximum operating frequency of the STM32F103RFT6?

The STM32F103RFT6 operates at a maximum CPU frequency of 72 MHz, achieved using its internal PLL with either the 4–16 MHz external crystal or the 8 MHz internal RC oscillator as source. This frequency is sustained with zero wait states for Flash access, delivering 1.25 DMIPS/MHz performance per Dhrystone 2.1 benchmark.

Does the STM32F103RFT6 support USB device functionality without external components?

Yes - the STM32F103RFT6 integrates a full-speed USB 2.0 device transceiver with internal pull-up resistor control. Only a single 1.5 kΩ pull-up resistor on the USB_DP line is required for enumeration; no external PHY or level-shifting components are needed for standard USB CDC or HID implementations.

How many analog-to-digital converter channels are available on this MCU?

The STM32F103RFT6 provides three independent 12-bit ADCs with a combined total of 21 external input channels. Each ADC supports triple-sample-and-hold mode, enabling simultaneous sampling of up to three signals - critical for vector-controlled motor drives and multi-sensor monitoring systems.

Is the STM32F103RFT6 pin-compatible with other STM32F103 variants in LQFP64?

Yes - all STM32F103x6 devices (e.g., RBT6, RCT6, RET6) in LQFP64 share identical pinouts and electrical characteristics. Differences lie solely in Flash size (64–768 KB) and SRAM (20–96 KB); firmware and hardware designs are interchangeable within the same memory configuration constraints.