STMicroelectronics STM32F102CBT6

Overview

STM32F102CBT6 from STMicroelectronics is a 32-bit Arm® Cortex®-M3 microcontroller in LQFP48 package, featuring 128 KB Flash, 16 KB SRAM, USB 2.0 Full-Speed interface, 12-bit ADC with 16 channels, and operation up to 48 MHz. It integrates six timers (including independent/window watchdogs), eight communication interfaces (2×I²C, 3×USART, 2×SPI, 1×USB), and supports 5 V-tolerant I/Os for industrial HMI and USB-connected sensor nodes.

For engineers reviewing the STM32F102CBT6 datasheet, STM32F102CBT6 pinout, STM32F102CBT6 application, or STM32F102CBT6 equivalent, key selection factors include USB FS PHY integration, 48 MHz CPU clock with zero-wait-state Flash access, 12-bit ADC accuracy (±2 LSB INL), RTC with VBAT backup, and support for SWD/JTAG debug in compact LQFP48.

Technical Context

The STM32F102CBT6 implements an Arm Cortex-M3 core with single-cycle multiplication and hardware divide, executing from Flash at 48 MHz with 1.25 DMIPS/MHz performance. Its clock system includes dual oscillators (4–16 MHz HSE and 32.768 kHz LSE), programmable PLL, and factory-trimmed 8 MHz HSI RC source - enabling precise USB timing and RTC calibration.

Peripheral integration centers on USB 2.0 Full-Speed device functionality with integrated transceiver, supporting HID, CDC, and DFU classes without external PHY. The 7-channel DMA controller offloads data movement for ADC, USART, SPI, and I²C, while NVIC supports 64 interrupt vectors with configurable priority for real-time responsiveness.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, ECOPACK® certified, suitable for reflow soldering and high-density layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F102CBT6, STM32F072CBT6 trades USB integration for lower price and power, while STM32F103CBT6 shifts focus to CAN-based systems at the expense of native USB device capability - making STM32F102CBT6 uniquely optimized for cost-sensitive, self-contained USB peripheral designs.

Availability

STM32F102CBT6 is available at Aetrix Electronics and suitable for USB human interface devices, industrial sensor nodes, USB-to-serial bridges, and smart power controllers requiring stable component supply across production lifecycles.

Supply support for STM32F102CBT6 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 products for industrial, automotive, and consumer markets.

The STM32F102x8/xB series belongs to ST's USB Access Line - engineered specifically for cost-effective, USB-integrated embedded applications requiring robust analog peripherals, low-power operation, and seamless host connectivity without external PHY components.

FAQ

Does STM32F102CBT6 support USB host mode?

No. STM32F102CBT6 integrates only a USB 2.0 Full-Speed device PHY and controller, supporting device-only roles such as HID, CDC, or DFU. It lacks OTG capabilities or host controller logic. For USB host functionality, consider STM32F105/107 or STM32F4-series MCUs with USB OTG HS/FS peripherals.

What is the maximum operating temperature for continuous use?

The STM32F102CBT6 is rated for industrial temperature range: –40°C to +85°C ambient. Junction temperature must remain ≤125°C under all conditions; thermal design should maintain θ_JA ≤ 45°C/W using the exposed thermal pad and recommended PCB copper pour per ST AN2018 guidelines.

Can the internal 8 MHz RC oscillator be used for USB timing?

No. USB Full-Speed requires ±0.25% clock accuracy; the factory-trimmed 8 MHz HSI RC has ±1% tolerance and drift over temperature/voltage. Only the 4–16 MHz HSE crystal oscillator or PLL-derived clock locked to HSE meets USB timing specifications.

How many GPIO pins support external interrupt capability?

All 37 user GPIOs (across ports A–C and part of port D) are individually mappable to 16 external interrupt/event lines (EXTI0–EXTI15). Each EXTI line can be triggered by rising/falling edge or both, enabling flexible wake-up and event handling from buttons, sensors, or communication signals.