STMicroelectronics STM32L081CBT6TR

Overview

STM32L081CBT6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller with 192 KB Flash, 20 KB SRAM, and 6 KB EEPROM with ECC; features 12-bit ADC (1.14 Msps), AES-128 hardware encryption, and operates from 1.65 V to 3.6 V across –40 °C to +125 °C - deployed in battery-powered smart meters and industrial sensor nodes.

For engineers reviewing the STM32L081CBT6TR datasheet, STM32L081CBT6TR pinout, STM32L081CBT6TR application, or STM32L081CBT6TR equivalent, key selection criteria include standby current (0.29 µA), RTC-enabled Stop mode (0.86 µA), 5 µs Flash wakeup time, 31 I/Os with 5V tolerance, and integrated AES for secure firmware updates.

Technical Context

The STM32L081CBT6TR integrates a Cortex-M0+ core with MPU, supporting dynamic voltage scaling and multiple low-power modes including Standby (0.29 µA), Stop (0.43 µA), and Stop+RTC+RAM retention (0.86 µA). Its clock system combines HSE (1–25 MHz), LSE (32 kHz RTC), HSI16 (±1%), MSI (65 kHz–4.2 MHz), and PLL for flexible frequency synthesis up to 32 MHz.

Analog subsystem includes a 12-bit ADC with 16-channel support down to 1.65 V supply, two ultra-low-power comparators with window mode and wake-up capability, and internal temperature sensor with factory calibration. The 7-channel DMA controller supports concurrent transfers for ADC, SPI, I2C, USART, timers, and AES.

Key Specifications

Pinout & Package

LQFP48 package: 48-pin, 7 × 7 mm, 0.5 mm pitch, ECOPACK2-compliant surface-mount package with exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L071CBT6, the STM32L081CBT6TR adds AES-128 and 64 KB more Flash without increasing standby current; versus STM32L431CBT6, it delivers superior energy efficiency in intermittent-sensing use cases despite lower peak performance.

Availability

STM32L081CBT6TR is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, industrial predictive maintenance, and medical wearable monitors requiring stable component supply across extended product lifecycles.

Supply support for STM32L081CBT6TR 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 ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding long battery life, robust security, and high integration - optimized for metering, wearables, and IoT edge nodes operating across extended temperature ranges.

FAQ

What is the maximum operating frequency and core type of the STM32L081CBT6TR?

The STM32L081CBT6TR features an Arm Cortex-M0+ core with a maximum CPU frequency of 32 MHz, delivering 0.95 DMIPS/MHz. It supports dynamic voltage scaling and multiple clock sources - including HSE (1–25 MHz), HSI16 (16 MHz ±1%), and MSI (65 kHz–4.2 MHz) - enabling precise trade-offs between performance and power consumption in real-time applications.

Does the STM32L081CBT6TR support hardware encryption, and what algorithms are implemented?

Yes, the STM32L081CBT6TR integrates a dedicated AES-128 hardware encryption engine compliant with FIPS-197. It supports ECB, CBC, CTR, and GCM modes with DMA acceleration, enabling secure firmware updates, encrypted data logging in EEPROM, and authenticated communication without CPU overhead or software library dependencies.

How many I/O pins are 5V tolerant, and what is the package type?

The STM32L081CBT6TR provides 31 5V-tolerant I/O pins in its LQFP48 package (7 × 7 mm, 0.5 mm pitch). This allows direct interfacing with legacy 5V peripherals without level-shifting circuitry, reducing BOM cost and PCB area - particularly valuable in industrial control and retrofit metering designs.

What are the lowest power consumption modes and their typical currents?

The lowest power modes are Standby (0.29 µA with 3 wakeup pins) and Stop + RTC + 20 KB RAM retention (0.86 µA). Both retain full register and RAM content; Standby disables all clocks and regulators except for the wakeup logic, while Stop maintains RTC operation and selected SRAM blocks - verified per DS10888 Rev 6 electrical characteristics tables.