STMicroelectronics STM32L151VBH6D

Overview

STM32L151VBH6D from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller in LQFP100 package, featuring 128 KB Flash, 16 KB SRAM, 4 KB EEPROM with ECC, 12-bit ADC (1 Msps, 24 channels), and dual 12-bit DACs. It operates from 1.65–3.6 V, supports -40°C to +85°C, and delivers 214 µA/MHz active current - ideal for battery-powered IoT sensors and portable medical devices requiring long runtime and analog precision.

For engineers reviewing the STM32L151VBH6D datasheet, STM32L151VBH6D pinout, STM32L151VBH6D application, or STM32L151VBH6D equivalent, key selection criteria include standby current (0.3 µA), RTC-enabled stop mode (1.2 µA), USB 2.0 interface with internal 48 MHz PLL, capacitive touch support (20 channels), and 73 5V-tolerant I/Os with 16 interrupt vectors.

Technical Context

The STM32L151VBH6D implements dynamic voltage scaling and multiple low-power modes (Run, Sleep, Low-power Run, Stop, Standby) with sub-µA retention states. Its Cortex-M3 core runs up to 32 MHz with 1.25 DMIPS/MHz performance and includes a memory protection unit (MPU) for secure embedded execution.

It integrates dual ultra-low-power comparators with window mode and wake-up capability, a temperature sensor, internal VREFINT, and hardware CRC unit. Clock system combines HSE (1–24 MHz), LSE (32.768 kHz), HSI (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), plus a USB-capable PLL generating 48 MHz.

Key Specifications

Pinout & Package

LQFP100 (14 × 14 mm, 0.5 mm pitch) package with exposed thermal pad - suitable for industrial PCBs requiring mechanical robustness and thermal dissipation in compact layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L151VBH6D, STM32L431RCT6 trades EEPROM and sub-µA standby for FPU and higher throughput, while EFM32PG12B500F1024GL125 offers more memory but sacrifices RTC-backed ultra-low-power retention - making STM32L151VBH6D optimal for EEPROM-dependent, RTC-critical, long-life battery nodes.

Availability

STM32L151VBH6D is available at Aetrix Electronics and suitable for smart utility metering, wearable health monitors, industrial sensor nodes, and asset tracking beacons requiring stable component supply across multi-year production cycles.

Supply support for STM32L151VBH6D 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 automotive semiconductors since 1987.

The STM32L1 series targets ultra-low-power embedded applications - specifically designed for battery-operated devices demanding multi-year runtime, analog precision, and robust firmware security in harsh environments.

FAQ

Does STM32L151VBH6D support USB without an external crystal?

Yes. The device integrates a 48 MHz PLL fed by its internal 16 MHz HSI RC oscillator, enabling full-speed USB 2.0 operation without requiring an external crystal or oscillator. This reduces BOM count and board area while maintaining USB compliance under specified voltage and temperature conditions.

What is the maximum operating frequency when running from internal RC oscillators?

The STM32L151VBH6D achieves up to 32 MHz CPU frequency using the HSI oscillator (16 MHz ±1%) combined with its PLL. The MSI oscillator supports frequencies from 65 kHz to 4.2 MHz and is used for low-power clocking, but not for full-speed CPU operation.

How many I/O pins support 5V tolerance, and which ones are excluded?

73 of the 83 total I/Os are 5V tolerant, covering all pins in GPIO ports A through E except for specific analog-dedicated pins (e.g., VREF+, VREF−, VBAT, USB_DP/DM). Pin-specific tolerance is confirmed in Section 4 (Pin descriptions) of the datasheet, Table 8.

Is the 4 KB EEPROM truly independent of Flash, and what is its endurance?

Yes. The 4 KB EEPROM is a separate silicon block with dedicated ECC logic, rated for 100,000 write/erase cycles and guaranteed data retention for 20 years at 85°C. It supports byte-level writes and is accessible via standard HAL drivers without Flash page erasure overhead.