STMicroelectronics STM32L151R6H6

Overview

STM32L151R6H6 from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller featuring 128 KB Flash, 32 KB SRAM, 4 KB EEPROM with ECC, 12-bit ADC (1 Msps, 24 channels), and dual 12-bit DACs - deployed in battery-powered IoT sensors, portable medical monitors, and smart utility meters requiring sub-µA standby operation.

For engineers reviewing the STM32L151R6H6 datasheet, STM32L151R6H6 pinout, STM32L151R6H6 application, or STM32L151R6H6 equivalent, key selection criteria include verified ultra-low-power modes (0.28 µA Standby), integrated USB 2.0 PHY with internal 48 MHz PLL, capacitive touch support (up to 20 channels), and 73 5V-tolerant I/Os with full remapping capability.

Technical Context

The STM32L151R6H6 implements a Cortex-M3 core running at up to 32 MHz with MPU, dynamic voltage scaling, and five low-power modes (Run, Sleep, Low-power Run, Stop, Standby). It integrates a 12-bit ADC with hardware oversampling, two buffered 12-bit DACs, and two ultra-low-power comparators with window mode and wake-up capability.

Clock architecture includes multiple sources: HSE (1–24 MHz), LSE (32.768 kHz RTC), HSI (16 MHz ±1%), LSI (37 kHz), MSI (65 kHz–4.2 MHz), and a programmable PLL for CPU/USB clock generation. Power management features BOR with 5 thresholds, PVD, and ultra-low I/O leakage (10 nA).

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad - optimized for compact PCB layout and thermal dissipation in space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power MCU applications.

Compared with STM32L071RBT6, the STM32L151R6H6 delivers superior analog integration (dual DAC, EEPROM, comparators) and USB; versus STM32L431RCT6, it offers significantly lower active and standby power at the expense of FPU and higher Flash density - making it optimal for energy-constrained, analog-rich edge nodes.

Availability

STM32L151R6H6 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable diagnostic devices requiring stable component supply and long-term production continuity.

Supply support for STM32L151R6H6 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 STM32L1 series targets ultra-low-power embedded applications demanding multi-year battery life, robust analog integration, and secure firmware execution - with the L151R6H6 specifically optimized for cost-sensitive, space-constrained, and sensor-intensive designs.

FAQ

Does STM32L151R6H6 support USB device mode without external crystal?

Yes. The STM32L151R6H6 integrates an internal 48 MHz PLL fed by its HSE or MSI oscillator, enabling full-speed USB 2.0 device operation without an external 48 MHz crystal. USB_DP/DM pins connect directly to the connector with only 1.5 kΩ pull-up on DP - eliminating BOM cost and layout complexity.

What is the maximum number of capacitive sensing channels supported?

The STM32L151R6H6 supports up to 20 capacitive sensing channels using its built-in Capacitive Sensing Controller (CSD). These channels can be configured for touchkey, linear slider, or rotary encoder topologies, with hardware-accelerated charge transfer and noise filtering - no external IC or firmware overhead required.

How does the 4 KB EEPROM differ from standard Flash memory in practice?

This 4 KB EEPROM is implemented as a dedicated memory block with hardware ECC, byte-level erase/write capability, and guaranteed 100,000 write/erase cycles. Unlike Flash, it supports single-byte updates without sector erasure - ideal for storing calibration data, device IDs, or runtime configuration that changes frequently during field operation.

Is the STM32L151R6H6 qualified for industrial temperature range?

Yes. The STM32L151R6H6 is specified for operation from –40°C to +105°C ambient temperature, with validated electrical characteristics across this full range. Its ultra-low-power BOR, PVD, and temperature sensor (±1.5°C accuracy) ensure reliable behavior in harsh environments like outdoor utility meters or factory-floor sensors.