STMicroelectronics STM32L071CBT6TR

Overview

STM32L071CBT6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller with 128 KB Flash, 20 KB SRAM, 6 KB EEPROM, 12-bit ADC (1.14 Msps), and operating voltage range of 1.65–3.6 V. It delivers 0.95 DMIPS/MHz performance at up to 32 MHz and supports 78 5V-tolerant I/Os, making it suitable for battery-powered IoT sensor nodes requiring long runtime and mixed-signal integration.

For engineers reviewing the STM32L071CBT6TR datasheet, STM32L071CBT6TR pinout, STM32L071CBT6TR application, or STM32L071CBT6TR equivalent, key selection criteria include standby current (0.29 µA), RTC + RAM retention in Stop mode (0.86 µA), 5 µs Flash wakeup time, and dual ultra-low-power comparators with wake-up capability down to 1.65 V.

Technical Context

This MCU implements a dual-voltage domain architecture with separate regulator outputs for core (V_DD) and I/O (V_DDIO), enabling dynamic voltage scaling across Run, Sleep, Low-power Run, and Stop modes. Its interconnect matrix routes peripherals-including four USARTs (two with ISO 7816/IrDA), three I2C (two with SMBus/PMBus), and six SPI-to DMA channels without CPU intervention.

The embedded reset and supply management block integrates five BOR thresholds, programmable voltage detector (PVD), and POR/PDR with ultra-low-power design. Clock system includes factory-trimmed 16 MHz HSI (±1%), 32 kHz LSE for RTC calibration, and PLL supporting CPU frequencies up to 32 MHz with configurable pre-divider and multiplier.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad (ECOPACK2 compliant). Pin count: 48 leads; body size: 7.0 × 7.0 × 1.4 mm; RoHS-compliant, halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072CBT6, the STM32L071CBT6TR lacks hardware crypto but matches its ultra-low-power profile and peripheral set; versus STM32L051C8T6, it doubles Flash/SRAM, adds EEPROM and two extra USARTs - enabling richer firmware features and longer field data retention without external memory.

Availability

STM32L071CBT6TR is available at Aetrix Electronics and suitable for smart metering, wearable health monitors, industrial sensor nodes, and asset tracking beacons requiring stable component supply across multi-year production cycles.

Supply support for STM32L071CBT6TR 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-grade components since 1987.

The STM32L0 series targets ultra-low-power applications in battery-operated and energy-harvesting systems, emphasizing sub-µA sleep currents, integrated EEPROM, and robust analog peripherals for edge intelligence without external support components.

FAQ

What is the maximum operating frequency and corresponding power consumption in Run mode?

The STM32L071CBT6TR operates up to 32 MHz with 0.95 DMIPS/MHz performance. At 32 MHz and 3.3 V supply, typical Run mode current is 93 µA/MHz (≈3.0 mA total), verified per DS10690 Rev 7 Table 29. This value assumes code execution from Flash with active peripherals disabled - adding ADC or UART increases current linearly based on enabled functions.

Does this MCU support hardware encryption or secure boot?

No, the STM32L071CBT6TR does not include hardware AES, DES, or TRNG blocks. Secure boot relies on software-implemented signature verification using the embedded CRC unit and protected Flash sectors. For hardware-accelerated cryptography, ST recommends the pin-compatible STM32L072CBT6 variant, which adds AES-128 and TRNG peripherals.

Can the 6 KB EEPROM be used for storing calibration coefficients across power cycles?

Yes - the 6 KB data EEPROM is rated for 100,000 write/erase cycles and 20-year data retention at 85°C (DS10690 Rev 7 Section 6.3.9). It supports byte/word programming and sector erase, with ECC protection ensuring bit-error correction during read operations. Calibration data written during factory test remains intact through 100,000 field rewrites.

What are the thermal limitations for continuous operation in LQFP48 package?

The LQFP48 package has a maximum junction temperature of 125°C and thermal resistance θ_JA = 60°C/W (DS10690 Rev 7 Table 24). At 3.3 V and 32 MHz with all peripherals active, typical power dissipation is ~15 mW - resulting in <1°C junction rise above ambient. Derating is required only above 100°C ambient or under forced convection constraints.