STMicroelectronics STM32F101RBH6

Overview

STM32F101RBH6 from STMicroelectronics is a medium-density ARM® Cortex®-M3 microcontroller with 128 KB Flash, 16 KB SRAM, 36 MHz max CPU frequency, 12-bit ADC (1 µs conversion), and 7 communication interfaces (2×I²C, 3×USART, 2×SPI). It serves as the main control unit in compact industrial sensor nodes requiring real-time I/O handling, low-power operation, and integrated analog sensing.

For engineers reviewing the STM32F101RBH6 datasheet, STM32F101RBH6 pinout, STM32F101RBH6 application, or STM32F101RBH6 equivalent, key selection criteria include Flash/SRAM size, 5 V-tolerant GPIO count (up to 51 pins), RTC+VBAT support, SWD debug interface, and UFQFPN48 package thermal performance for space-constrained PCB layouts.

Technical Context

The STM32F101RBH6 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. Its clock system integrates dual oscillators (8 MHz HSI + 32.768 kHz LSE), programmable PLL, and independent RTC clock domain.

DMA operates across 7 channels servicing timers, ADC, SPI, I²C, and USART peripherals-enabling zero-CPU-overhead data transfers. The 12-bit ADC supports up to 16 external channels plus internal temperature sensor, with conversion range 0–3.6 V and linearity error ±2 LSB.

Key Specifications

Pinout & Package

STM32F101RBH6 uses the UFQFPN48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined per ST's DocID13586 Rev 17, Table 4 and Figure 6.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F103RBH6, the STM32F101RBH6 offers identical packaging and peripheral set at lower Flash density and no USB-ideal for fixed-function control. Versus STM32G071RBT6, it delivers higher interrupt throughput and legacy toolchain compatibility but lacks modern security IP blocks.

Availability

STM32F101RBH6 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart HVAC controllers, energy meter interface modules, and PLC I/O expansion units requiring stable component supply and long-term production continuity.

Supply support for STM32F101RBH6 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, specializing in microcontrollers, power management, and automotive ICs with vertical manufacturing capability.

The STM32F101xB belongs to ST's "medium-density access line" product family, designed specifically for cost-optimized, low-power industrial control applications where deterministic real-time response and analog integration outweigh advanced connectivity needs.

FAQ

What is the maximum operating temperature for STM32F101RBH6 in UFQFPN48 package?

The STM32F101RBH6 is rated for industrial temperature range –40 °C to +85 °C. Thermal resistance θ_JA is 41.5 °C/W (UFQFPN48, 4-layer board), allowing sustained operation at 85 °C ambient when PCB layout includes adequate copper pour under the thermal pad and ≥4 thermal vias.

Does STM32F101RBH6 support hardware floating-point unit (FPU)?

No. The STM32F101RBH6 integrates an ARM Cortex-M3 core without hardware FPU. All floating-point operations must be performed in software using CMSIS-DSP library functions or compiler-generated soft-float code, with typical overhead of ~20–40 cycles per single-precision operation.

Can the internal 8 MHz RC oscillator be used as system clock source without calibration?

Yes-the factory-trimmed 8 MHz HSI oscillator has ±1% accuracy over temperature and voltage, sufficient for UART communication at 9600–115200 bps without external crystal. For higher precision (e.g., USB or audio timing), an external 4–16 MHz crystal is required.

How many ADC channels can be simultaneously sampled using DMA?

The STM32F101RBH6 supports regular channel sequencing up to 16 conversions per trigger event. When configured with DMA, all 16 channels can be sampled in sequence per ADC trigger (e.g., timer update), with results stored contiguously in memory-enabling synchronized multi-sensor acquisition without CPU polling.