STMicroelectronics STM32L412R8I6

Overview

STM32L412R8I6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, 80 MHz max frequency, 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 operates across -40 °C to 85 °C in LQFP64 package - ideal for battery-powered IoT sensor nodes requiring long runtime and real-time signal conditioning.

For engineers reviewing the STM32L412R8I6 datasheet, STM32L412R8I6 pinout, STM32L412R8I6 application, or STM32L412R8I6 equivalent, key selection criteria include sub-1 µA Stop 2 mode current (0.7 µA), 4 µs wake-up latency, USB 2.0 full-speed crystal-less capability, and hardware parity on 8 KB SRAM - critical for safety-aware portable medical devices, smart metering endpoints, and low-duty-cycle environmental monitors.

Technical Context

The STM32L412R8I6 integrates an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from flash at 80 MHz, coupled with a memory protection unit (MPU) and proprietary code readout protection. Its FlexPowerControl architecture supports dynamic voltage scaling and multiple low-power modes - including Shutdown (16 nA), Standby with RTC (245 nA), and Stop 2 (0.7 µA) - all managed via embedded power control logic and BOR circuitry.

It features a dual-bank interconnect matrix routing up to 12 communication interfaces (USB, 3×I²C, 3×USART, LPUART, 2×SPI, Quad SPI), 10 timers (including 2 low-power 16-bit timers active in Stop mode), and dedicated analog resources supplied independently to minimize noise coupling - enabling simultaneous sensing, processing, and secure wireless transmission in compact edge nodes.

Key Specifications

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch) with exposed thermal pad; RoHS-compliant and ECOPACK2 certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L432KC and STM32L452RE, the STM32L412R8I6 offers the lowest active and standby currents in its family, prioritizes minimal silicon area and cost for resource-constrained nodes, and uniquely combines Quad SPI XIP with sub-1 µA Stop 2 - making it optimal for compact, long-life, flash-extensible edge sensors.

Availability

STM32L412R8I6 is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, smart utility meters, and industrial predictive maintenance edge nodes requiring stable component supply, long-term lifecycle assurance, and full traceability.

Supply support for STM32L412R8I6 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 analog chips for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, integrated analog functionality, and robust security - specifically engineered for battery-operated IoT endpoints and energy-sensitive industrial controllers.

FAQ

What is the minimum supply voltage for STM32L412R8I6 in Run mode?

The STM32L412R8I6 operates in Run mode from 1.71 V to 3.6 V. Below 1.71 V, brown-out reset (BOR) triggers to prevent unreliable operation. The device supports external SMPS regulation down to 1.10 V on VDD12, enabling efficient sub-1.8 V core operation while maintaining full peripheral functionality.

Does STM32L412R8I6 support USB without an external crystal?

Yes. The STM32L412R8I6 integrates a USB 2.0 full-speed crystal-less transceiver with internal clock recovery system (CRS), eliminating the need for a 48 MHz external crystal. This reduces BOM cost and PCB area while maintaining ±0.25% USB timing accuracy across temperature and voltage ranges.

How many I/O pins support wakeup from Stop mode?

Four dedicated wakeup pins (WKUP1–WKUP4) are available - mapped to PA0, PC13, PC14, and PC15 - each capable of generating an interrupt to exit Stop, Standby, or Shutdown modes. Additional GPIOs configured as EXTI lines can also serve as wakeup sources depending on selected low-power mode.

Is hardware parity available across all SRAM?

No. Hardware parity checking is implemented only on the first 8 KB of SRAM (SRAM1). The remaining 32 KB (SRAM2) lacks parity protection. This design balances fault tolerance for critical data structures (e.g., stack, control variables) with silicon area efficiency for bulk buffer usage.