STMicroelectronics STM32L151RBH6D

Overview

STM32L151RBH6D from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller featuring 128 KB Flash, 16 KB SRAM, 4 KB EEPROM with ECC, 12-bit ADC (1 Msps, 24 channels), and dual 12-bit DACs - deployed in battery-powered IoT sensor nodes, portable medical devices, and smart utility meters requiring sub-µA standby operation.

For engineers reviewing the STM32L151RBH6D datasheet, STM32L151RBH6D pinout, STM32L151RBH6D application, or STM32L151RBH6D equivalent, key selection criteria include verified ultra-low-power mode current (0.3 µA Standby), USB 2.0 full-speed interface with internal 48 MHz PLL, LCD driver exclusion (per device variant), and 73 I/Os with 5V tolerance - all validated for industrial temperature range (-40°C to +85°C).

Technical Context

The STM32L151RBH6D integrates a Cortex-M3 core running up to 32 MHz with MPU, dynamic voltage scaling, and multiple clock sources including HSE (1–24 MHz), LSE (32.768 kHz RTC), HSI (16 MHz ±1%), and MSI (65 kHz–4.2 MHz). Its power architecture supports five low-power modes with precise wakeup timing (<8 µs from Stop) and hardware-based brownout reset with five threshold levels.

Analog subsystem includes two ultra-low-power comparators with window mode and wake-up capability, temperature sensor, VREFINT reference, and dedicated ADC/DAC peripherals operating down to 1.8 V supply - all coordinated via 7-channel DMA and shared bus matrix to minimize active time and leakage.

Key Specifications

Pinout & Package

STM32L151RBH6D uses a 64-pin LQFP package (10 × 10 mm, 0.5 mm pitch) with exposed pad for thermal management. Pin functions are fully defined per ST's DocID17659 Rev 12, Table 8 (pin definitions) and Table 9 (alternate function mapping).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L071RBT6, STM32L151RBH6D adds USB, EEPROM, and dual DACs at slightly higher standby current; versus STM32L431RCT6, it trades FPU and speed for guaranteed sub-µA low-power operation and embedded EEPROM - making it optimal for long-life, sensor-centric deployments.

Availability

STM32L151RBH6D is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, portable medical diagnostics, and smart utility meters requiring stable component supply across extended product lifecycles.

Supply support for STM32L151RBH6D 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 MEMS sensors - with over 40 years of automotive-grade reliability and industrial certification expertise.

The STM32L1 series targets ultra-low-power embedded applications, designed specifically for energy-harvesting and battery-operated systems where sub-µA sleep currents, integrated analog peripherals, and EEPROM persistence are mandatory design requirements.

FAQ

Does STM32L151RBH6D include an integrated LCD controller?

No. The STM32L151RBH6D excludes the LCD driver present in STM32L152 variants. This is explicitly confirmed in the datasheet's "Device overview" section (page 11) and Table 1, which states "LCD Driver (except STM32L151x/6/8/B devices)". Designers requiring segment LCD support must select STM32L152RBH6D or add external driver ICs.

What is the maximum allowed crystal frequency for the HSE oscillator?

The HSE oscillator supports external crystals from 1 MHz to 24 MHz, as specified in Section 3.4 ("Clock management") and Table 26 ("High-speed external user clock characteristics"). Operation above 24 MHz violates absolute maximum ratings and may cause startup failure or timing instability in USB and PLL-derived clocks.

How many I/O pins support 5V tolerance, and are they configurable?

73 of the 83 total I/Os are 5V tolerant, as stated in the "Features" summary (page 1). These pins are fixed in tolerance - no software configuration is required or possible. Tolerance applies only when VDD is ≥2.0 V; operation below this voltage invalidates 5V tolerance per Section 6.3.13 ("I/O port characteristics").

Is the 4 KB EEPROM truly erasable and writable during normal operation?

Yes. The 4 KB of true EEPROM supports byte/word erase and write operations while the MCU is running, with endurance rated at 400k cycles and data retention of 20 years at 85°C (Section 6.3.35, Table 36). It uses dedicated hardware controllers and does not rely on Flash emulation libraries.