STMicroelectronics STM32L412R8T6

Overview

STM32L412R8T6 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 energy-harvesting edge nodes.

For engineers reviewing the STM32L412R8T6 datasheet, STM32L412R8T6 pinout, STM32L412R8T6 application, or STM32L412R8T6 equivalent, key selection criteria include its 28 µA/MHz run current in SMPS mode, 245 nA standby-with-RTC power, 4 µs wake-up from Stop mode, and LQFP64 package compatibility with industrial temperature range (–40 °C to +125 °C).

Technical Context

The device integrates an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from flash at 80 MHz, alongside a memory protection unit (MPU) and interconnect matrix for deterministic peripheral access. Its power architecture includes dual voltage regulator modes-integrated LDO and external SMPS support-with dynamic voltage scaling across six low-power modes.

Clock system flexibility includes four internal oscillators (16 MHz RC ±1%, 32 kHz RC ±5%, multispeed 100 kHz–48 MHz auto-trimmed by LSE, and 48 MHz with clock recovery), plus crystal options (4–48 MHz HSE, 32 kHz LSE), and a PLL for system clock generation-all managed via RCC peripheral.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package 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 STM32L432KCU6, the STM32L412R8T6 offers lower system cost and smaller PCB area with sufficient memory for basic sensor edge logic, while the STM32L552RET6 adds cryptographic acceleration and memory protection at higher power and price-making the L412 optimal for cost-sensitive, battery-constrained industrial sensing where security is handled externally.

Availability

STM32L412R8T6 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial predictive maintenance sensors, and energy-harvesting wireless nodes requiring stable component supply across extended product lifecycles.

Supply support for STM32L412R8T6 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 ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The STM32L4 series is engineered for ultra-low-power embedded applications demanding high performance-per-milliwatt, long battery life, and rich analog integration-targeting IoT endpoints, portable medical devices, and smart infrastructure.

FAQ

What is the maximum operating frequency and corresponding performance metric?

The STM32L412R8T6 operates at up to 80 MHz with an integer performance of 100 DMIPS (Dhrystone 2.1) and 273.55 CoreMark® (3.42 CoreMark/MHz). This is achieved using the ART Accelerator™, which eliminates flash wait states, and the Cortex-M4 core with FPU enables efficient floating-point math for sensor fusion and control algorithms.

Does this MCU support external SMPS, and how does it affect power efficiency?

Yes, the STM32L412R8T6 supports external SMPS via dedicated VDD12 and VDDA12 pins. In SMPS mode, it achieves 28 µA/MHz in Run mode at 3.3 V-nearly 3× more efficient than LDO mode (79 µA/MHz)-and maintains full peripheral functionality, making it ideal for battery-operated systems where energy density is critical.

What debug interfaces are available, and are JTAG pins required?

The device supports Serial Wire Debug (SWD) via SWDIO and SWCLK pins only-no JTAG pins needed. SWD provides full programming, breakpoint, and real-time trace capabilities using just two wires, simplifying PCB layout and reducing pin count versus legacy JTAG. Embedded Trace Macrocell™ (ETM) enables instruction-level tracing when enabled.

Can the integrated op-amp be used in standalone mode without external components?

Yes, the single rail-to-rail op-amp includes an internal programmable gain amplifier (PGA) with gains of 2, 4, 8, or 16, and can operate in unity-gain buffer or non-inverting configurations without external resistors. It is powered from VDDA and supports input common-mode range from VSSA to VDDA, enabling direct connection to resistive sensors or ADC inputs.