STMicroelectronics STM32L011F3U3TR

Overview

STM32L011F3U3TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN20 (3×3 mm) package, featuring 16 KB Flash, 2 KB SRAM, 512 B 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 and delivers 76 µA/MHz in Run mode - ideal for battery-powered sensor nodes and smart metering endpoints.

For engineers reviewing the STM32L011F3U3TR datasheet, STM32L011F3U3TR pinout, STM32L011F3U3TR application, or STM32L011F3U3TR equivalent, key selection criteria include standby current (0.23 µA), RTC-enabled Stop mode (0.54 µA), 5 µs Flash wakeup time, and 23 5V-tolerant I/Os - all critical for energy-constrained embedded designs requiring long-term autonomy and rapid event response.

Technical Context

This MCU implements a hierarchical low-power architecture with five operational modes (Run, Sleep, Low-power Run, Low-power Sleep, Stop, Standby), where voltage scaling and clock gating are dynamically managed by the embedded regulator and power control block. Its Cortex-M0+ core runs at up to 32 MHz with 0.95 DMIPS/MHz and supports Thumb-2 instruction set for compact, deterministic code execution.

The clock system integrates multiple independent sources: factory-trimmed 16 MHz HSI (±1%), 37 kHz LSI, 65 kHz–4.2 MHz MSI, 32 kHz LSE for RTC calibration, and a PLL for CPU frequency multiplication. All analog peripherals - including ADC, comparators, and temperature sensor - operate down to 1.65 V, enabling full functionality across the entire supply range.

Key Specifications

Pinout & Package

STM32L011F3U3TR is housed in a 20-pin Ultra Thin Fine Pitch Quad Flat No-lead (UFQFPN20) package measuring 3 × 3 mm with 0.5 mm pitch, optimized for space-constrained PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L011F3U3TR, STM32L031F3P6 trades EEPROM and second comparator for lower unit cost, while EFM32ZG222F32 offers more Flash/RAM but omits ECC and dual-comparator autonomous wake-up - making STM32L011F3U3TR optimal for safety-critical, long-life, sensor-triggered deployments.

Availability

STM32L011F3U3TR is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, industrial predictive maintenance, and medical wearable patches requiring stable component supply across extended product lifecycles.

Supply support for STM32L011F3U3TR 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, MEMS, and automotive semiconductors since 1987.

The STM32L0 Access line targets ultra-low-power embedded applications, emphasizing energy efficiency, integrated analog peripherals, and robust memory protection - specifically engineered for battery-operated IoT endpoints and industrial sensors.

FAQ

What is the maximum operating frequency of the STM32L011F3U3TR?

The STM32L011F3U3TR's Arm Cortex-M0+ core operates at up to 32 MHz, supported by its internal 16 MHz HSI oscillator (±1% factory trim) and PLL multiplier. This frequency is achievable across the full 1.65–3.6 V supply range and –40 to +125 °C temperature range, with dynamic voltage scaling ensuring stable performance under varying load conditions.

Does the STM32L011F3U3TR support hardware encryption or secure boot?

No, the STM32L011F3U3TR does not integrate hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. It provides a 96-bit unique ID for software-based key derivation and supports read-out protection (RDP) Level 1/2 to prevent unauthorized firmware extraction, but full secure boot requires external trusted elements or software-only implementations.

Can the internal 12-bit ADC measure signals below 1.65 V?

No - the ADC requires minimum VDD ≥ 1.65 V to operate, and its input voltage range is 0 to VREF+ (typically VDD). While the ADC can function down to 1.65 V supply, it cannot digitize signals below ground or above VREF+. For sub-1.65 V signals, external signal conditioning (e.g., amplification or level-shifting) is required before ADC input.

Is the STM32L011F3U3TR pin-compatible with other STM32L011 variants?

Yes - the STM32L011F3U3TR in UFQFPN20 package shares identical pinout with STM32L011F3P6 (TSSOP20) and STM32L011F3U6 (UFQFPN20, 32 KB Flash variant), but differs from LQFP32 or WLCSP25 variants. Pin compatibility enables drop-in replacement within the same package family, preserving PCB layout and firmware across memory/configurations.