STMicroelectronics STM32F103RET6TR

Overview

STM32F103RET6TR from STMicroelectronics is a high-density performance-line Arm® Cortex®-M3 microcontroller featuring 512 KB Flash, 64 KB SRAM, USB 2.0 full-speed interface, CAN 2.0B controller, and triple 12-bit ADCs with 21 channels - deployed in industrial motor control, PLC I/O modules, and embedded HMI systems.

For engineers reviewing the STM32F103RET6TR datasheet, STM32F103RET6TR pinout, STM32F103RET6TR application, or STM32F103RET6TR equivalent, key selection criteria include 72 MHz CPU clock, 112 I/O pins (5 V-tolerant), dual 12-bit DACs, FSMC support for external NOR/PSRAM, and SWD/JTAG debug capability.

Technical Context

The device integrates an Arm Cortex-M3 core with Harvard architecture, single-cycle multiply/hardware divide, and nested vectored interrupt controller (NVIC) supporting up to 80 interrupts. Its memory subsystem includes 512 KB on-chip Flash with error correction, 64 KB SRAM, and a flexible static memory controller (FSMC) with four chip selects for parallel interface to external memories.

Clock management combines four oscillator sources: 4–16 MHz HSE crystal, 8 MHz factory-trimmed HSI RC, 40 kHz LSI RC, and 32.768 kHz LSE RTC oscillator - all feeding a PLL capable of generating up to 72 MHz system clock. Power management supports Sleep, Stop, and Standby modes with VBAT-backed RTC and backup registers.

Key Specifications

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch), 64-pin quad flat lead frame with exposed thermal pad - suitable for cost-sensitive industrial PCBs requiring reflow soldering and manual inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F103VET6, the RET6 offers identical core performance and peripheral set in a smaller LQFP64 package - ideal for space-constrained designs where full I/O count isn't required. Versus STM32F407VGT6, it trades raw compute for lower cost, power, and proven industrial qualification - making it optimal for deterministic real-time control without floating-point overhead.

Availability

STM32F103RET6TR is available at Aetrix Electronics and suitable for industrial motor control, PLC I/O modules, and embedded HMI systems requiring stable component supply across multi-year production cycles.

Supply support for STM32F103RET6TR 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, specializing in microcontrollers, power management, sensors, and automotive ICs - with over 40 years of industrial-grade product validation.

This part belongs to the STM32F1 "Performance Line" product family, designed specifically for cost-sensitive industrial automation, motor control, and human-machine interface applications demanding high peripheral integration and deterministic real-time operation.

FAQ

Does STM32F103RET6TR support USB device mode without external PHY?

Yes. It integrates a full-speed USB 2.0 device-mode PHY with internal transceivers and endpoint buffers - enabling CDC, HID, or MSC class implementations directly from firmware without external components. The USB clock is derived from the PLL and requires precise 48 MHz tuning via the USB prescaler register.

What is the maximum operating temperature range for this part?

The STM32F103RET6TR is rated for industrial temperature range: –40 °C to +85 °C ambient. This is confirmed in Section 5.3.1 of DS5792 Rev 13, with thermal derating applied above 70 °C for sustained 72 MHz operation under full peripheral load.

Can the internal 8 MHz RC oscillator be used as system clock source?

Yes - the 8 MHz HSI oscillator is factory-trimmed to ±1% accuracy and can serve as system clock source via the RCC clock configuration registers. However, USB and CAN require precise 48 MHz or 36 MHz clocks, which necessitate PLL usage with either HSE or HSI as input - HSI alone cannot meet USB timing tolerance without PLL multiplication.

Is the LQFP64 package RoHS and REACH compliant?

Yes. Per ST's ECOPACK® documentation and ordering code suffix "TR", the STM32F103RET6TR uses lead-free, halogen-free, and RoHS/REACH-compliant materials. The LQFP64 package meets JEDEC J-STD-020D moisture sensitivity level 3 (MSL3) and qualifies for standard reflow profiles.