STM32L412RBT6 ST Mainstream Arm Cortex-M4 Ultra-Low-Power 32-bit MCU 128KB Flash 40KB SRAM USB ADC Comparator LQFP-64

STM32L412RBT6 Product Overview

STM32L412RBT6 is an Arm Cortex-M4 MCU at 80 MHz with FPU, LQFP-64. 128 KB Flash, 40 KB SRAM, USB 2.0 FS device (crystal-less), 12-bit ADC (16 ch), two comparators, LP timers, RTC, 2×USART, 1×UART, 1×LPUART, 2×SPI/I2S, 3×I2C. Up to 52 x 5 V-tolerant I/Os. 1.71–3.6 V, -40–85 °C. Compared to the 32-pin L412KBT6, the 64-pin package provides more I/Os and richer ADC channels, making STM32L412RBT6 a more flexible ultra-low-power platform for battery-powered IoT nodes, portable devices, and sensor applications requiring richer connectivity and USB communication. STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

STM32L412RBT6 Core Features

Core: Arm Cortex-M4 80 MHz, FPU + ART Accelerator. STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

Memory: 128 KB Flash, 40 KB SRAM. STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

USB: USB 2.0 FS device (crystal-less). STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

Analog: 12-bit ADC (16 ch), 2×Comparators. STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

Connectivity: 2×USART, 1×UART, 1×LPUART, 2×SPI/I2S, 3×I2C. STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

Timers: 1×Advanced Timer, multiple GP/LP timers, RTC. STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

I/Os: 52 (5 V-tolerant). STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

Package: LQFP-64. STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

Temperature Range: -40°C to 85°C. STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

STM32L412RBT6 Applications

IoT Sensor Nodes: Battery-powered wireless sensors, USB data acquisition modules. STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

Portable Devices: Wearables, portable medical devices, USB peripherals. STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

Industrial Metering: Water, gas, and electricity meters. STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

Consumer Electronics: Remote controls, e-labels, smart cards. STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

Low-Power Applications Needing More I/Os: Miniaturized controllers, energy harvesting nodes. STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

STM32L412RBT6 Key Advantages

Cortex-M4 + FPU + Ultra-Low Power: Excellent DSP and floating-point performance while maintaining extremely low power consumption. STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

Integrated Crystal-less USB: Enables USB communication without an external crystal, simplifying design and saving BOM. STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

128 KB Flash + 40 KB SRAM: Ample storage for complex programs and data processing. STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

2 Built-in Comparators: Signal threshold detection without external components. STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

52 I/Os in LQFP-64 Package: Rich pin resources for multi-peripheral connectivity. STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

5 V-tolerant I/Os: Enhanced system noise immunity and simplified external level-shifting circuitry. STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

Full Ecosystem Compatibility: Easy development with STM32CubeIDE/HAL/LL libraries. STM32L412RBT6 is an ideal choice for cost-sensitive designs. STM32L412RBT6 offers excellent low-power performance and rich peripherals.

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FAQ

1. What is STM32L412RBT6?
STM32L412RBT6 is an ultra-low-power 32-bit MCU from STMicroelectronics' STM32L4 series, built around an Arm® Cortex®-M4 core with FPU and DSP instructions in an LQFP-64 package. Operating at 80 MHz, it provides 128 KB Flash and 40 KB SRAM, along with a USB 2.0 full-speed device interface, a 12-bit 5 Msps ADC, ultra-low-power comparators, and a rich set of timers. With a streamlined memory configuration and excellent energy efficiency, it is designed for cost-sensitive, battery-powered devices with moderate storage needs.

2. What are the key specifications of STM32L412RBT6?

• Core: Arm® Cortex®-M4, up to 80 MHz, 100 DMIPS with FPU and DSP

• Memory: 128 KB Flash, 40 KB SRAM

• Operating Voltage: 1.71 V to 3.6 V

• Temperature Range: -40 °C to +85 °C (industrial grade)

• I/O Count: up to 52

• Package: LQFP-64 (10 mm × 10 mm)

3. Is the LQFP-64 package easy to solder?
It comes in an LQFP-64 package measuring 10 mm × 10 mm with exposed 0.5 mm pitch leads. Drag-soldering with a standard soldering iron and flux is straightforward—no hot-air station required—making it ideal for hand assembly, prototyping, and small-batch production.

4. What applications is STM32L412RBT6 suitable for?
With 128 KB Flash, a USB device interface, and rich low-power modes, it is widely used in cost-sensitive battery-powered devices that need USB connectivity, such as portable medical monitors, wireless sensor nodes, USB dongles, small motor controllers, and compact IoT endpoints. The 40 KB SRAM comfortably supports a lightweight RTOS and basic communication stacks.

5. What development tools support STM32L412RBT6?
ST provides free STM32CubeMX for graphical configuration and STM32CubeIDE as an integrated development environment, along with the STM32CubeL4 firmware library. Debugging and programming are handled by ST-Link debuggers. The pin-compatible NUCLEO-L412RB board offers a fast path for prototyping, allowing seamless code migration to the target device.

6. What is the power consumption like across its low-power modes?

• Temperature Range: -40 °C to +85 °C

• Ultra-low-power modes:

  • Shutdown mode: ~33 nA (5 wake-up pins)

  • Standby mode: ~125 nA (5 wake-up pins), ~430 nA with RTC

  • Stop 2 mode: ~1.2 µA, ~1.4 µA with RTC

  • Run mode: ~100 µA/MHz (LDO mode)

7. What key peripheral interfaces does STM32L412RBT6 offer?

• Communication: I²C, SPI, UART/USART, USB 2.0 Full-Speed Device

• Analog: 12-bit 5 Msps ADC, ultra-low-power comparators

• Timers: 16-bit general-purpose timers, low-power timer

• Others: Capacitive touch sensing channels (TSC)

8. How does STM32L412RBT6 compare to the STM32L432KCU6?
Both are 80 MHz Cortex-M4 devices. The L412RBT6 uses a larger LQFP-64 package with 52 I/Os, while the L432KCU6 comes in a compact 32-pin QFN. The L412 omits the CAN, SAI, and USB host capabilities found on the L432, keeping only USB device, and offers 40 KB SRAM instead of 64 KB. If you don't need CAN or audio interfaces but require more I/Os and a hand-solderable package, the L412RBT6 is a more cost-effective choice.

9. Is 40 KB SRAM enough when running a USB stack, and how can memory be optimized?
40 KB SRAM can run a lightweight RTOS (e.g., FreeRTOS) and USB device libraries (CDC, HID), but careful memory planning is required. Optimize by sizing task stacks tightly, using static allocation, enabling compiler optimization, and leveraging DMA to offload data transfers. For applications needing larger buffers, external SPI Flash or FRAM can be added via Quad SPI or I2C.

10. What if my project needs CAN or a DAC? Can STM32L412RBT6 support that?
The L412RBT6 does not include a native CAN controller or DAC. If CAN is essential, consider the STM32L432 or STM32L433. If you must use the L412, you could add an external SPI-to-CAN controller (e.g., MCP2515) or an external DAC chip (e.g., MCP4725) via I2C/SPI, but this will increase BOM cost and PCB footprint—so evaluate early during component selection.