STMicroelectronics STM32L011E4Y6TR

Overview

STM32L011E4Y6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in WLCSP25 package (2.133 × 2.070 mm), featuring 16 KB Flash, 2 KB SRAM, 512 B EEPROM with ECC, 12-bit ADC (1.14 Msps), and operation down to 1.65 V. It delivers 0.95 DMIPS/MHz performance and supports 0.23 µA Standby mode - ideal for battery-powered IoT sensors and wearable health monitors requiring long-term autonomous operation.

For engineers reviewing the STM32L011E4Y6TR datasheet, STM32L011E4Y6TR pinout, STM32L011E4Y6TR application, or STM32L011E4Y6TR equivalent, key selection criteria include verified low-power mode current (0.23 µA Standby), WLCSP25 footprint compatibility, 12-bit ADC accuracy at 1.65 V supply, and integrated RTC + 2 KB RAM retention in Stop mode.

Technical Context

The STM32L011E4Y6TR implements a single-core Arm Cortex-M0+ executing at up to 32 MHz, supported by multiple clock sources: factory-trimmed 16 MHz HSI (±1%), 32 kHz LSE for RTC calibration, and multispeed MSI (65 kHz–4.2 MHz). Its power architecture includes dynamic voltage scaling, ultralow-power BOR with five thresholds, and programmable voltage detector (PVD).

Peripheral interconnect uses a dedicated AHB/APB matrix enabling concurrent DMA transfers across ADC, USART, SPI, I²C, and timers. The device integrates two ultra-low-power comparators (operable down to 1.65 V) with window mode and wake-up capability, plus CRC unit and 96-bit unique ID - all optimized for deterministic real-time response in energy-constrained edge nodes.

Key Specifications

Pinout & Package

STM32L011E4Y6TR is housed in a 25-ball WLCSP (Wafer-Level Chip Scale Package) with 0.4 mm pitch, optimized for space-constrained PCBs. Ball layout follows JEDEC MO-255 standard with perimeter I/O and central VSS/VDD balls.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L011K4T6, the STM32L011E4Y6TR saves >75% PCB area but requires micro-reflow assembly; versus STM32L031K6T6, it trades memory headroom for cost reduction in fixed-function deployments.

Availability

STM32L011E4Y6TR is available at Aetrix Electronics and suitable for battery-powered IoT sensors, medical wearables, industrial wireless monitors, and asset tracking beacons requiring stable component supply across multi-year production cycles.

Supply support for STM32L011E4Y6TR 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 series targets ultra-low-power embedded applications, emphasizing sub-µA standby operation, integrated analog peripherals, and robust security features for secure edge intelligence in resource-constrained environments.

FAQ

What is the maximum operating frequency of the STM32L011E4Y6TR?

The STM32L011E4Y6TR operates at up to 32 MHz using its internal 16 MHz HSI oscillator with PLL multiplication or external crystal sources. This frequency is fully supported across the entire 1.65–3.6 V supply range and −40 °C to +125 °C temperature range, with 0.95 DMIPS/MHz performance confirmed in production data.

Does the STM32L011E4Y6TR support hardware encryption?

No, the STM32L011E4Y6TR does not integrate hardware AES or PKA accelerators. It relies on software-based cryptographic libraries for encryption tasks. For hardware-accelerated security, ST recommends the STM32L4 or STM32L5 series, which include AES-128/256 and SHA-256 engines.

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). With internal VREFINT (1.22 V), the effective measurable range is limited to 0–1.22 V, but this requires VDD ≥ 1.65 V to power the reference circuitry. External VREF+ down to 1.65 V is supported.

Is SWD debugging supported on the WLCSP25 package?

Yes - SWD debugging is fully supported via dedicated PA13 (SWDIO) and PA14 (SWCLK) balls on the WLCSP25 package. These pins are electrically identical to those on larger packages and require standard 10-pin ARM Cortex debug connectors with appropriate micro-probe access or soldered pogo-pin fixtures.