STMicroelectronics STM32L031E6Y6TR

Overview

STM32L031E6Y6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in a 28-pin UFQFPN (4 × 4 mm) package, featuring 32 KB Flash, 8 KB SRAM, 1 KB EEPROM with ECC, 12-bit ADC (1.14 Msps), and dual ultra-low-power comparators. It operates from 1.65–3.6 V across –40 to +125 °C, delivering 76 µA/MHz in Run mode and 0.23 µA in Standby - ideal for battery-powered sensor nodes and smart metering endpoints.

For engineers reviewing the STM32L031E6Y6TR datasheet, STM32L031E6Y6TR pinout, STM32L031E6Y6TR application, or STM32L031E6Y6TR equivalent, key selection criteria include verified low-power mode current specs (Stop: 0.35 µA, Standby: 0.23 µA), 31 I/Os with 5V tolerance, integrated RTC with 8 KB RAM retention, and pre-programmed USART/SPI bootloader support.

Technical Context

The STM32L031E6Y6TR implements a single-core Arm Cortex-M0+ running up to 32 MHz with 0.95 DMIPS/MHz performance, supported by dynamic voltage scaling and multiple clock sources: HSI16 (±1%), LSE (32 kHz RTC), MSI (65 kHz–4.2 MHz), and PLL. Its interconnect matrix routes peripherals-including ADC, timers, and communication interfaces-without CPU intervention.

Power management integrates five BOR thresholds, programmable voltage detector (PVD), and three low-power modes (Sleep, Stop, Standby) with configurable wakeup sources: 2 dedicated pins in Standby, 16 lines in Stop, and RTC alarm or comparator events. The 12-bit ADC supports up to 10 channels at 1.14 Msps down to 1.65 V supply, with internal reference (VREFINT) and temperature sensor calibration.

Key Specifications

Pinout & Package

STM32L031E6Y6TR uses a 28-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN) package, 4 × 4 mm body, 0.5 mm pitch, 0.55 mm max height, ECOPACK®2 compliant. Pinout validated per STMicroelectronics DS10668 Rev 6, Section 4 (Pin descriptions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L011E4Y6TR, the STM32L031E6Y6TR adds 1 KB EEPROM and doubles Flash capacity - critical for OTA update staging and sensor calibration persistence; versus STM32L051K8U6, it trades USB and extra Flash for smaller size and lower static power, optimizing for minimal energy-per-event in constrained nodes.

Availability

STM32L031E6Y6TR is available at Aetrix Electronics and suitable for smart metering, wireless sensor networks, portable medical devices, and asset tracking beacons requiring stable component supply across multi-year production cycles.

Supply support for STM32L031E6Y6TR 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 analog components for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding sub-µA standby, integrated analog, and long-term reliability - specifically engineered for battery-operated IoT edge nodes and energy-harvesting systems.

FAQ

What is the maximum operating frequency and core type of the STM32L031E6Y6TR?

The STM32L031E6Y6TR features an Arm Cortex-M0+ core rated for up to 32 MHz operation, delivering 0.95 DMIPS/MHz. It achieves this frequency using the internal 16 MHz HSI oscillator (factory-trimmed to ±1%) or external crystal/PLL sources. The core supports Thumb-2 instruction set and includes a single-cycle multiplier for efficient math operations in sensor fusion algorithms.

Does the STM32L031E6Y6TR support 5V-tolerant I/Os, and how many are available?

Yes, the STM32L031E6Y6TR provides 31 I/O pins with 5V tolerance, confirmed in Section 3.7 of DS10668 Rev 6. This applies to all GPIOs (PA0–PA15, PB0–PB15, PC13–PC15) and allows direct interfacing with 5V peripherals such as legacy sensors, displays, or logic ICs without external level shifters - reducing BOM count and PCB complexity.

What are the verified current consumption values in Stop and Standby modes?

Per DS10668 Rev 6 Table 31 and Table 32, the STM32L031E6Y6TR draws 0.35 µA typical in Stop mode (16 wakeup lines active) and 0.23 µA typical in Standby mode (2 dedicated wakeup pins active), both measured at 3.0 V and 25 °C. These values are silicon-validated and include internal regulator leakage - enabling accurate battery life modeling for decade-long deployments.

Is there hardware support for cryptographic operations or secure boot in this MCU?

No, the STM32L031E6Y6TR does not integrate hardware accelerators for AES, SHA, or secure boot. It lacks a TRNG, memory protection unit (MPU), or embedded secure ROM. Security relies on software-based implementations or external secure elements. For certified secure applications, ST recommends the STM32L5 or STM32U5 series, which include ARM TrustZone and cryptographic peripherals.