STMicroelectronics STM32F102C4T6A

Overview

STM32F102C4T6A from STMicroelectronics is a low-density USB access line Arm® Cortex®-M3 microcontroller featuring 16 KB Flash, 4 KB SRAM, USB 2.0 Full-Speed interface, 48 MHz CPU clock, and integrated 12-bit ADC with temperature sensor - deployed in embedded USB peripheral controllers, industrial sensor nodes, and compact human-interface devices.

For engineers reviewing the STM32F102C4T6A datasheet, STM32F102C4T6A pinout, STM32F102C4T6A application, or STM32F102C4T6A equivalent, key selection considerations include USB FS timing compliance, 5 V-tolerant I/O count (37 pins), SRAM size for real-time buffering, and LQFP48 thermal performance under 85°C ambient operation.

Technical Context

The device implements a single-core Arm Cortex-M3 with Harvard architecture, supporting Thumb-2 instruction set and nested vectored interrupt controller (NVIC) for deterministic real-time response. It integrates a PLL-based clock tree with dual oscillators (8 MHz HSI + 32.768 kHz LSE) enabling precise USB frame timing and RTC synchronization.

Peripheral interconnect uses AHB/APB buses with DMA-driven data movement across five communication interfaces (USB, 2×USART, I²C, SPI), while the 12-bit ADC supports up to 16 channels with 1.2 µs conversion time and internal temperature sensing - all operating within 2.0–3.6 V supply range and supporting Sleep/Stop/Standby low-power modes.

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch), RoHS-compliant, ECOPACK® certified - optimized for compact PCB layouts with thermal pad compatibility and standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F103C4T6, the STM32F102C4T6A trades Flash headroom for integrated USB, eliminating external bridge ICs; versus STM32F042F4P6, it delivers higher interrupt throughput and richer peripheral mapping at identical USB functionality and package size.

Availability

STM32F102C4T6A is available at Aetrix Electronics and suitable for USB peripheral controllers, industrial sensor nodes, embedded bridges, and motor interface modules requiring stable component supply across production lifecycles.

Supply support for STM32F102C4T6A 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 since 1987.

The STM32F102x4/x6 series belongs to ST's USB Access Line - engineered specifically for cost-sensitive, space-constrained embedded systems needing native USB connectivity without external transceivers or complex clock trees.

FAQ

What is the maximum operating temperature for STM32F102C4T6A?

The device is qualified for industrial temperature range (–40°C to +85°C) per datasheet DS5934 Rev 6 Section 5.3.1. Junction temperature must remain below 125°C under continuous operation; thermal resistance θ_JA is 46°C/W in LQFP48 package with standard 2-layer PCB layout.

Does STM32F102C4T6A support USB suspend/resume functionality?

Yes - the integrated USB 2.0 Full-Speed controller supports suspend detection (via SE0 signaling) and remote wakeup. The device enters low-power Stop mode during USB suspend and resumes via EXTI line triggered by USB activity, consuming ≤2.5 µA in this state.

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

No - USB Full-Speed requires precise 48 MHz clock with ±0.25% tolerance. The internal 8 MHz RC oscillator has ±1% typical accuracy and cannot meet USB timing requirements. An external 4–16 MHz crystal with PLL multiplication is mandatory for USB operation.

How many external interrupt lines are available on STM32F102C4T6A?

The device supports 16 external interrupt/event lines (EXTI0–EXTI15), each configurable to trigger on rising/falling/both edges. All 37 GPIOs can be mapped to these 16 lines via AFIO register configuration, enabling flexible button, sensor, or communication event handling.