STMicroelectronics STM32F102R8T6

Overview

STM32F102R8T6 from STMicroelectronics is a medium-density Arm® Cortex®-M3 microcontroller with 64 KB Flash, 10 KB SRAM, USB 2.0 Full-Speed interface, 12-bit ADC (1.2 µs conversion), and operates at up to 48 MHz. It integrates PLL clock generation, RTC with VBAT backup, and supports 37 I/Os-32 of which are 5 V-tolerant-targeting embedded USB peripheral control in industrial sensors and smart metering.

For engineers reviewing the STM32F102R8T6 datasheet, STM32F102R8T6 pinout, STM32F102R8T6 application, or STM32F102R8T6 equivalent, key selection factors include USB FS timing compliance, 5 V-tolerant GPIO count, 12-bit ADC accuracy over temperature, and LQFP64 package thermal performance for convection-cooled industrial PCBs.

Technical Context

The STM32F102R8T6 implements an Arm Cortex-M3 core with Harvard bus architecture, single-cycle multiply/hardware divide, and nested vectored interrupt controller (NVIC) supporting 68 interrupts. Its clock system includes dual oscillators (4–16 MHz HSE + 32.768 kHz LSE), programmable voltage detector (PVD), and PLL with 2–16× multiplication factor feeding CPU, USB, and APB domains.

Peripheral integration follows a hierarchical AHB/APB2/APB1 bus structure: USB FS and ADC connect to APB1; GPIO, USART, SPI, and I²C are distributed across APB2 and APB1; DMA channels (7 total) support memory-to-peripheral transfers for ADC, timers, and communication interfaces without CPU intervention.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, ECOPACK® certified; suitable for reflow soldering and industrial thermal cycling (−40°C to +85°C ambient).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F102R8T6, the STM32F072RB trades USB hardware acceleration for lower cost and power, while the STM32F103R8T6 extends functionality with CAN and extra timers-both retain LQFP64 compatibility but address distinct protocol and real-time control needs.

Availability

STM32F102R8T6 is available at Aetrix Electronics and suitable for industrial sensor nodes, USB human interface devices, smart energy meter interfaces, and USB firmware updater modules requiring stable component supply across multi-year production cycles.

Supply support for STM32F102R8T6 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, MEMS, and automotive-grade components since 1987.

The STM32F102 series belongs to ST's USB Access Line-a cost-optimized Cortex-M3 product line targeting USB-peripheral applications where full USB host capability is unnecessary but device-class reliability and low BOM count are essential.

FAQ

What is the maximum operating temperature range for the STM32F102R8T6?

The STM32F102R8T6 is rated for industrial temperature operation from −40°C to +85°C. This range is validated per datasheet Section 5.3.1 and applies to all electrical characteristics including Flash read/write, ADC accuracy, and USB FS timing margins. Thermal derating is not required within this envelope.

Does the STM32F102R8T6 support external memory interfaces like FSMC or Quad-SPI?

No. The STM32F102R8T6 does not include FSMC, Quad-SPI, or any external memory bus interface. Its memory subsystem is limited to on-chip 64 KB Flash and 10 KB SRAM. External storage must be added via SPI or I²C peripherals (e.g., SPI Flash or I²C EEPROM), with software-managed access.

Can the internal 8 MHz RC oscillator be used as the system clock source without calibration?

Yes-the internal 8 MHz HSI oscillator is factory-trimmed to ±1% accuracy at 25°C and can serve as the system clock source without external crystal or runtime calibration. However, USB FS operation requires PLL lock with ±0.25% frequency tolerance, so HSI alone cannot meet USB timing unless trimmed via RCC_CR register using a reference clock.

How many independent PWM outputs does the STM32F102R8T6 support simultaneously?

The STM32F102R8T6 supports up to 12 independent PWM outputs: three 16-bit general-purpose timers (TIM2–TIM4), each with four capture/compare channels configurable as PWM outputs. All channels operate concurrently with independent duty cycle and period registers, enabling multi-phase motor control or synchronized LED dimming.