STMicroelectronics STM32F103R4H6A

Overview

STM32F103R4H6A from STMicroelectronics is a low-density performance-line ARM Cortex-M3 microcontroller with 16 KB Flash, 6 KB SRAM, 72 MHz CPU frequency, USB 2.0 full-speed and CAN 2.0B interfaces, and dual 12-bit ADCs - deployed in industrial motor control, sensor node firmware, and USB-connected embedded gateways.

For engineers reviewing the STM32F103R4H6A datasheet, STM32F103R4H6A pinout, STM32F103R4H6A application, or STM32F103R4H6A equivalent, key selection factors include Flash size vs. peripheral count trade-offs, LQFP64 package thermal performance, USB/CAN coexistence timing, and 16-channel ADC channel mapping for multi-sensor acquisition.

Technical Context

The device implements an ARM Cortex-M3 core with Harvard architecture, single-cycle multiplication, hardware divide, and nested vectored interrupt controller (NVIC) supporting up to 68 interrupts. It integrates a 72 MHz PLL fed by 4–16 MHz HSE or 8 MHz HSI oscillator, with independent 40 kHz LSI and 32.768 kHz LSE for RTC calibration.

Peripheral interconnect uses AHB/APB buses: APB1 hosts timers, I²C, USARTs, SPI, CAN, and USB; APB2 serves GPIO, ADC, TIM1, and system control. The 7-channel DMA controller supports memory-to-peripheral transfers without CPU intervention for ADC, SPI, USART, and timer capture operations.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant ECOPACK® construction; rated for industrial temperature range (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F103R4H6A, the STM32F030F4P6 sacrifices USB/CAN and real-time performance for lower cost, while the STM32F103C8T6 extends memory capacity within the same architecture - making the R4H6A optimal for fixed-feature, volume-sensitive industrial nodes where 16 KB Flash and LQFP64 mechanical fit are design constraints.

Availability

STM32F103R4H6A is available at Aetrix Electronics and suitable for industrial motor control, USB human interface devices, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STM32F103R4H6A 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 STM32F1 series targets cost-sensitive, high-integration embedded applications demanding ARM Cortex-M3 performance with rich analog and communication peripherals - optimized for rapid development of industrial automation, motor control, and USB-connected edge devices.

FAQ

What is the maximum operating frequency and associated power consumption?

The STM32F103R4H6A achieves 72 MHz CPU frequency using its internal PLL. At 3.3 V and 72 MHz with all peripherals active, typical current consumption is 36 mA in Run mode; with peripherals disabled, it drops to 24 mA. These values are measured with code executing from Flash and include core, memory, and clock system overhead.

Does this MCU support USB device functionality without external components?

Yes - the STM32F103R4H6A integrates a full-speed USB 2.0 transceiver with internal pull-up resistors and dedicated D+/D− pins (PA11/PA12). No external PHY or termination resistors are required; only standard USB connector wiring and proper PCB layout (length-matched differential traces, ground plane) are needed for reliable enumeration.

How many ADC channels can be simultaneously sampled with synchronized conversion?

The device supports dual-sample-and-hold mode across ADC1 and ADC2, enabling true simultaneous sampling of up to two channels (e.g., ADC1_IN0 and ADC2_IN1). This is implemented via shared trigger signals and independent conversion registers - essential for vector control where phase current and DC bus voltage must be captured at identical instants.

What debug interfaces are supported and what are their physical pin requirements?

The STM32F103R4H6A supports both SWD (Serial Wire Debug) and JTAG via dedicated pins: SWDIO (PA13), SWCLK (PA14), and optional NRST. JTAG requires five pins (TMS, TCK, TDI, TDO, NRST), but SWD - the recommended interface - uses only three pins and provides full debug capability including flash programming and real-time variable inspection.