STMicroelectronics STM32L412K8U6

Overview

STM32L412K8U6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 128 KB flash, 40 KB SRAM, and integrated analog peripherals including dual 12-bit ADCs (5 Msps), one operational amplifier with PGA, and one ultra-low-power comparator. It supports external SMPS for optimized efficiency and targets battery-powered IoT sensors, portable medical devices, and smart metering endpoints.

For engineers reviewing the STM32L412K8U6 datasheet, STM32L412K8U6 pinout, STM32L412K8U6 application, or STM32L412K8U6 equivalent, key selection criteria include verified low-power mode current (245 nA Standby + RTC), LPUART wake-up capability in Stop 2 mode, Quad SPI XIP support, and 5 V-tolerant I/Os across 32-pin UFQFPN package.

Technical Context

The device implements FlexPowerControl architecture with seven low-power modes, including Shutdown (16 nA), Standby with RTC (245 nA), and Stop 2 (0.7 µA) - all validated under 1.71–3.6 V supply and –40 °C to 85 °C operation. Its ART Accelerator™ enables zero-wait-state execution from flash at 80 MHz, while the interconnect matrix decouples bus arbitration for deterministic peripheral access.

Clock system integrates four independent sources: 4–48 MHz HSE, 32 kHz LSE for RTC, factory-trimmed 16 MHz HSI (±1%), and auto-calibrated MSI (±0.25% accuracy via LSE). USB 2.0 full-speed operates without external crystal using clock recovery.

Key Specifications

Pinout & Package

STM32L412K8U6 is housed in a 32-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN32) package measuring 5 × 5 mm with 0.5 mm pitch and exposed thermal pad. Pin functions are defined per DS12469 Rev 9 Section 4 (Pinouts and pin description), with dedicated VDD/VSS pairs, BOOT0, NRST, and configurable alternate-function I/Os supporting all major peripherals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L432KC, the STM32L412K8U6 offers identical low-power performance in Stop/Standby modes but trades flash/SRAM capacity and analog density for smaller UFQFPN32 footprint and lower unit cost. Versus STM32L072KBU6, it delivers 2.5× higher DMIPS, FPU, and advanced peripherals at only modest power overhead - justifying upgrade for sensor fusion or secure connectivity.

Availability

STM32L412K8U6 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable diagnostic devices requiring stable component supply across multi-year production cycles.

Supply support for STM32L412K8U6 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 products for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, with emphasis on secure firmware execution, rich analog integration, and flexible power management for battery- and energy-harvesting–powered systems.

FAQ

What is the maximum operating frequency and corresponding performance metric of the STM32L412K8U6?

The STM32L412K8U6 operates at up to 80 MHz with an Arm Cortex-M4 core featuring FPU and ART Accelerator™. Its performance is rated at 100 DMIPS (Dhrystone 2.1) and 273.55 CoreMark® (3.42 CoreMark/MHz), validated with zero-wait-state flash execution enabled.

Does the STM32L412K8U6 support crystal-less USB operation, and what is required to enable it?

Yes, the STM32L412K8U6 supports USB 2.0 full-speed operation without an external crystal via its internal clock recovery system (CRS). Enabling requires configuring the CRS to synchronize the 48 MHz USB clock to the LSE (32 kHz RTC oscillator), eliminating need for a 48 MHz crystal and associated capacitors.

How many low-power modes does the STM32L412K8U6 offer, and what is the lowest current consumption with RTC active?

The device offers seven low-power modes. The lowest verified current with RTC running is 245 nA in Standby mode (with RTC and 32×32-bit backup registers), measured at 3.3 V and 25 °C per DS12469 Rev 9 Table 46 - enabling decade-scale operation on primary lithium cells.

What package type and pin count does the STM32L412K8U6 use, and is it RoHS-compliant?

The STM32L412K8U6 uses the UFQFPN32 package: 32-pin, 5 × 5 mm body, 0.5 mm pitch, with exposed thermal pad. All packages in the STM32L412xx family, including this variant, are ECOPACK2-compliant - meeting RoHS, halogen-free, and lead-free requirements per ST's environmental policy.