STMicroelectronics STM32F101R6T6A

Overview

STM32F101R6T6A from STMicroelectronics is a low-density ARM® Cortex®-M3 32-bit microcontroller with 32 KB Flash, 6 KB SRAM, 36 MHz max CPU frequency, 12-bit ADC (1 µs conversion), and four communication interfaces (I²C, two USARTs, SPI). It operates from 2.0–3.6 V, supports Sleep/Stop/Standby low-power modes, and targets cost-sensitive industrial control and sensor interface applications.

For engineers reviewing the STM32F101R6T6A datasheet, STM32F101R6T6A pinout, STM32F101R6T6A application, or STM32F101R6T6A equivalent, key selection considerations include Flash/SRAM capacity, 48-pin LQFP package compatibility, 36 MHz real-time performance, 51 I/O count with 5 V tolerance on most pins, and integrated RTC with VBAT support.

Technical Context

The STM32F101R6T6A implements an ARM Cortex-M3 core with single-cycle multiplication and hardware division, executing at up to 36 MHz with 1.25 DMIPS/MHz efficiency. Its clock system integrates a 4–16 MHz external crystal oscillator, 8 MHz factory-trimmed internal RC, 40 kHz LSI RC, and a PLL for CPU clock generation.

Peripheral architecture includes a 7-channel DMA controller servicing timers, ADC, SPI, I²C, and USARTs; nested vectored interrupt controller (NVIC) supporting up to 48 interrupts; and memory-mapped peripherals including CRC calculation unit and 96-bit unique ID. The device uses a unified memory map with separate code, SRAM, and peripheral address spaces.

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch), RoHS-compliant, ECOPACK® certified. Pin count and I/O mapping align with STM32F101x6 family standardization for drop-in compatibility across R/T/C variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F101R6T6A, STM32F030F4P6 trades real-time capability and integrated peripherals for lower cost and power, while STM32F103C8T6 extends memory and feature set at marginally higher BOM cost-both retain LQFP48 compatibility but differ in RTC, CRC, and sensor integration.

Availability

STM32F101R6T6A is available at Aetrix Electronics and suitable for industrial sensor nodes, smart meter interface modules, and home appliance control units requiring stable component supply and long-term production continuity.

Supply support for STM32F101R6T6A 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 semiconductors since 1987.

The STM32F101x6 series belongs to ST's foundational Cortex-M3 access line, engineered for cost-sensitive, resource-constrained embedded applications where reliability, low power, and peripheral integration outweigh raw compute throughput.

FAQ

What is the maximum operating frequency of the STM32F101R6T6A?

The STM32F101R6T6A achieves a maximum CPU frequency of 36 MHz under 0 wait-state Flash access conditions. This is enabled by its ARM Cortex-M3 core with single-cycle multiplication and hardware division, delivering 1.25 DMIPS/MHz performance. The PLL can scale the 8 MHz internal RC or external crystal input to reach this frequency, subject to VDD ≥ 2.7 V per datasheet Section 5.3.1.

Does the STM32F101R6T6A support USB connectivity?

No, the STM32F101R6T6A does not include a USB peripheral. It is part of the low-density access line optimized for cost and power efficiency, offering I²C, two USARTs, and SPI instead. For USB-capable variants in the same family, consider the STM32F103xx series (e.g., STM32F103C8T6), which adds a full-speed USB 2.0 device interface.

How many I/O pins are 5 V tolerant on the STM32F101R6T6A?

Of its 51 GPIOs, the majority-including all pins in GPIO ports A and B (PA0–PA15, PB0–PB15)-are 5 V tolerant when configured as inputs or outputs in push-pull mode. This is confirmed in Section 2.3.22 and Table 33 of the datasheet. Pins PC13–PC15 (RTC-related) and BOOT0 are exceptions and must remain within VDD + 0.3 V.

Can the STM32F101R6T6A operate from a single 3.3 V supply?

Yes, the STM32F101R6T6A operates across 2.0–3.6 V, making it fully compatible with standard 3.3 V regulated supplies. All I/Os function correctly at 3.3 V, and the internal 8 MHz RC oscillator remains stable. No external voltage translation is needed for 3.3 V system designs, though decoupling capacitors (100 nF ceramic + 4.7 µF tantalum per VDD/VSS pair) are mandatory per Section 4.3.2 of the datasheet.