STMicroelectronics STM32F102RBT6

Overview

STM32F102RBT6 from STMicroelectronics is a medium-density USB access line Arm® Cortex®-M3 microcontroller featuring 128 KB Flash, 16 KB SRAM, USB 2.0 Full-Speed interface, 48 MHz CPU clock, and integrated 12-bit ADC with temperature sensor - deployed in industrial USB peripherals, smart sensors, and embedded control systems requiring compact firmware-upgradable connectivity.

For engineers reviewing the STM32F102RBT6 datasheet, STM32F102RBT6 pinout, STM32F102RBT6 application, or STM32F102RBT6 equivalent, key selection factors include USB FS host/device capability, 51-pin GPIO count with 5 V tolerance on most I/Os, 3× 16-bit timers with PWM/IC/OC, and dual watchdog (independent + window) for safety-critical real-time operation.

Technical Context

The STM32F102RBT6 implements an Arm Cortex-M3 core with Harvard architecture, single-cycle multiplication, hardware divide, and nested vectored interrupt controller (NVIC) supporting up to 64 interrupts. Its clock system integrates HSE (4–16 MHz), HSI (8 MHz factory-trimmed), LSE (32.768 kHz), and PLL for flexible USB-synchronized timing.

Peripheral interconnect uses AHB/APB buses with DMA-driven data flow across USARTs, SPIs, I²Cs, ADC, and USB. The device supports full-speed USB 2.0 with internal transceiver, no external PHY required, and includes CRC calculation unit and 96-bit unique ID for firmware integrity and device identification.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad - optimized for thermal dissipation in compact PCB layouts and compatible with standard reflow profiles per ECOPACK® environmental compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F072RBT6, the STM32F102RBT6 provides native USB FS and temperature-sensing ADC at identical package size; versus STM32F103RBT6, it trades CAN for lower system cost and reduced qualification scope in non-automotive deployments.

Availability

STM32F102RBT6 is available at Aetrix Electronics and suitable for industrial USB peripherals, smart sensor nodes, medical diagnostic tools, and programmable power monitors requiring stable component supply across multi-year production cycles.

Supply support for STM32F102RBT6 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 STM32F102 series belongs to ST's USB Access Line - engineered specifically for cost-effective, USB-enabled embedded control applications where full-speed connectivity, moderate processing, and analog integration are essential without CAN or advanced graphics requirements.

FAQ

Does STM32F102RBT6 support USB host mode?

No, the STM32F102RBT6 implements only USB 2.0 Full-Speed device mode with an integrated transceiver. It lacks the OTG controller, VBUS sensing, and ID pin required for host or OTG operation. Applications must use it as a USB peripheral connected to a host PC, smartphone, or embedded host controller.

What is the maximum operating temperature for continuous operation?

The STM32F102RBT6 is rated for industrial temperature range: –40 °C to +85 °C ambient. Junction temperature must remain ≤125 °C under all conditions; thermal design must account for 1.2 W max power dissipation in LQFP64 package, especially with USB active and multiple peripherals enabled.

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

Yes, the factory-trimmed 8 MHz HSI oscillator can serve as the system clock source directly or feed the PLL to achieve 48 MHz. However, USB FS requires ±0.25% frequency accuracy, which HSI alone cannot guarantee; an external 4–16 MHz crystal (HSE) is mandatory for reliable USB operation.

How many UART interfaces does STM32F102RBT6 support?

The STM32F102RBT6 supports up to three USARTs (USART1–USART3), each capable of asynchronous communication, LIN break detection, IrDA SIR encoding, and ISO 7816 smartcard protocols. All three are fully remappable to multiple GPIO ports via alternate function registers.