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STMicroelectronics STM32L412K8T6
- Part No.:
- STM32L412K8T6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
STM32L412K8T6.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:475
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Product details
Overview
STM32L412K8T6 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 STM32L412K8T6 datasheet, STM32L412K8T6 pinout, STM32L412K8T6 application, or STM32L412K8T6 equivalent, key selection criteria include verified sub-µA low-power modes (32 nA Standby, 245 nA Standby+RTC), LQFP32 package compatibility, USB 2.0 full-speed crystal-less operation, and hardware parity on 8 KB SRAM for functional safety-critical firmware.
Technical Context
The STM32L412K8T6 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 interconnect matrix for deterministic peripheral arbitration. Its power architecture includes dual regulator modes-integrated LDO and external SMPS support-with dynamic voltage scaling across Run, Stop, and Standby states.
It delivers precise timing via multiple clock sources: 4–48 MHz HSE, 32 kHz LSE for RTC, factory-trimmed 16 MHz RC (±1%), and auto-calibrated multispeed oscillator (±0.25%). The device implements batch acquisition mode (BAM) for sensor data collection during low-power operation and supports true random number generation (TRNG) for secure boot and key derivation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M4 with FPU and DSP instructions, delivering 100 DMIPS @ 80 MHz for real-time signal processing in resource-constrained edge nodes. |
| Flash / SRAM | 128 KB single-bank flash with readout protection; 40 KB SRAM (8 KB with hardware parity) enabling certified firmware storage and ECC-protected runtime variables. |
| Low-Power Modes | 32 nA Shutdown (4 wakeup pins), 245 nA Standby+RTC, 0.7 µA/MHz Run (LDO), 28 µA/MHz Run (@3.3 V SMPS) - validated for >10-year coin-cell operation. |
| Analog Peripherals | Dual 12-bit ADCs (5 Msps, 16-bit oversampling), 1 op-amp with programmable gain amplifier, 1 ultra-low-power comparator - supports autonomous sensor signal conditioning without host CPU wake-up. |
| Communication | USB 2.0 FS crystal-less, 3× I²C FM+, 3× USART (LIN/ISO7816/IrDA), 1× LPUART (Stop 2 wake-up), 2× SPI + Quad-SPI - enables direct sensor-to-cloud connectivity with minimal BOM. |
| Timers & RTC | 10 timers including 1× advanced motor-control, 2× low-power 16-bit (active in Stop mode), RTC with hardware calendar/alarm/calibration - suitable for time-triggered control and scheduled wake-up events. |
| Security & Debug | 96-bit unique ID, CRC calculation unit, TRNG, serial wire debug (SWD), Embedded Trace Macrocell - meets baseline requirements for device identity and traceable firmware development. |
Pinout & Package
LQFP32 (7 × 7 mm, 0.8 mm pitch) package with 25 general-purpose I/Os (most 5 V-tolerant), dedicated VDDA/VSSA for analog supply isolation, and separate VBAT pin for RTC/backup register retention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Main power supply and ground | Supports 1.71–3.6 V operation; decoupling required per datasheet layout guidelines to maintain SMPS/LDO stability and ADC accuracy. |
| VDDA, VSSA | Analog domain supply and ground | Independent analog rail enables noise-isolated ADC/OPAMP operation; must be filtered and routed separately from digital VDD. |
| VBAT | Backup power supply | Connects to coin cell or supercapacitor to retain RTC and 32×32-bit backup registers during main power loss (300 nA quiescent). |
| PA0–PA15, PB0–PB12 | General-purpose I/Os | 25 GPIOs with configurable pull-up/down, alternate functions, and most rated 5 V-tolerant - simplifies interface to legacy logic and sensors. |
| PA13/PA14/PA15 | SWD debug interface | Serial Wire Debug (SWD) pins enable programming and real-time debugging without JTAG overhead; PA13 = SWDIO, PA14 = SWCLK. |
| PA9/PA10 | USART1 TX/RX | Default UART interface for bootloader, diagnostics, or host communication; supports LIN physical layer via software modulation. |
| PA11/PA12 | USB D+/D− | Crystal-less USB 2.0 full-speed interface with built-in transceiver and internal clock recovery - eliminates external crystal and reduces BOM cost. |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Enables seamless transition between 7 low-power modes (Shutdown to Run) with sub-4 µs wake-up from Stop, preserving context and minimizing latency in event-driven systems. |
| ART Accelerator™ | Eliminates flash wait states at 80 MHz, achieving 3.42 CoreMark/MHz - critical for deterministic real-time loop execution in motor control or audio preprocessing. |
| Quad-SPI with XIP | Allows direct code execution from external flash memory, expanding effective program space beyond 128 KB while maintaining low active current (28 µA/MHz with SMPS). |
| Capacitive sensing controller (TSC) | Supports up to 12 channels for touchkey, linear, or rotary sensors using hardware-accelerated acquisition - enables battery-operated HMI without external ICs. |
| Hardware parity on 8 KB SRAM | Provides single-bit error detection for critical data buffers and stack regions, satisfying IEC 61508 SIL-2 and ISO 26262 ASIL-B functional safety requirements. |
Applications
| Wearable Health Monitor | Smart Utility Meter |
|---|---|
|
Use Scenario: Continuous ECG/PPG signal acquisition from dry electrodes, local feature extraction, and BLE transmission during periodic wake-ups. IC Role / Device Role / Timing Role: Primary MCU executing sensor fusion algorithms, managing ultra-low-power ADC sampling bursts, and synchronizing radio transmission windows via LPTIM-triggered RTC alarms. Use Value: 245 nA Standby+RTC and 4 µs Stop-mode wake-up extend coin-cell life beyond 3 years while maintaining precise timestamping for clinical-grade data logging. |
Use Scenario: Tamper-resistant electricity/water meter with pulse counting, temperature-compensated metrology, and secure over-the-air firmware updates. IC Role / Device Role / Timing Role: System controller handling metrology ADC reads, cryptographic signature verification (via TRNG + CRC), and secure boot validation before each update. Use Value: Hardware parity on SRAM and 96-bit unique ID ensure integrity of calibration constants and prevent cloning, meeting ANSI C12.22 and DLMS/COSEM compliance. |
| Wireless Sensor Node | Industrial Predictive Maintenance Module |
|
Use Scenario: Battery-powered vibration/temperature node collecting data every 5 minutes, performing FFT-based anomaly detection, and transmitting alerts via LoRaWAN. IC Role / Device Role / Timing Role: Edge AI accelerator running lightweight neural network inference on SRAM-resident weights, triggered by LPUART or EXTI wake events from accelerometer interrupt. Use Value: 28 µA/MHz Run mode with external SMPS allows sustained 20 MHz operation during inference - reducing processing time and total energy per inference cycle by 65% vs. LDO mode. |
Use Scenario: DIN-rail mounted module monitoring motor bearing temperature, current harmonics, and acoustic emissions for early fault detection. IC Role / Device Role / Timing Role: Real-time controller acquiring synchronized multi-channel analog inputs (current, temp, mic), applying FIR filtering in hardware-accelerated DMA mode, and buffering results to Quad-SPI flash. Use Value: Dual 12-bit ADCs with 5 Msps throughput and hardware oversampling deliver 16-bit effective resolution at 100 kSPS - sufficient for IEEE 112 standard motor testing without external precision ADCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32L432KCU6 | Same L4 series, but 256 KB flash, 64 KB SRAM, USB DFU support, and no Quad-SPI; uses WLCSP32 package (not LQFP32). | Targets firmware-upgradable devices requiring larger code space and smaller footprint, but lacks external memory expansion capability. | Select when higher flash density and chip-scale packaging outweigh need for Quad-SPI or LQFP32 mechanical compatibility. |
| STM32L072KBU6 | Cortex-M0+, lower performance (32 MHz, 33 DMIPS), 128 KB flash, 20 KB SRAM, no FPU or ART Accelerator; supports same LQFP32 package. | Suitable for simpler sensor polling or timer-based control where DSP math or high-speed ADC streaming is unnecessary. | Choose for cost-sensitive designs with relaxed real-time demands and no requirement for floating-point or 80 MHz deterministic execution. |
Compared with STM32L432KCU6, the STM32L412K8T6 offers Quad-SPI expansion and LQFP32 compatibility at lower flash density; versus STM32L072KBU6, it delivers 3× higher DMIPS, FPU, and advanced analog features - making it optimal for compute-intensive, memory-expandable, and mechanically constrained edge nodes.
Availability
STM32L412K8T6 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, and wireless sensor nodes requiring stable component supply, long-term lifecycle assurance, and ECOPACK2-compliant packaging.
Supply support for STM32L412K8T6 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, designing and manufacturing microcontrollers, power management ICs, sensors, and analog components for industrial, automotive, and consumer markets.
The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, integrated analog front-ends, and robust security primitives - specifically engineered for battery-operated and energy-harvesting IoT endpoints.
FAQ
What is the maximum operating frequency and corresponding performance metric?
The STM32L412K8T6 operates at up to 80 MHz with its Arm Cortex-M4 core and FPU, achieving 100 DMIPS (Dhrystone 2.1) and 273.55 CoreMark® (3.42 CoreMark/MHz). This performance level is sustained with zero wait states thanks to the ART Accelerator™, enabling real-time execution of complex control loops and signal processing tasks directly from flash memory.
Does this MCU support external SMPS, and what power savings does it enable?
Yes, the STM32L412K8T6 supports external switched-mode power supply (SMPS) via dedicated VDD12 and VDDA12 pins. When powered by SMPS at 3.3 V, it achieves 28 µA/MHz in Run mode - a 75% reduction compared to 112 µA/MHz in LDO mode - significantly extending battery life in continuous-sensing applications such as environmental monitoring nodes.
How many I/O pins are available in the LQFP32 package, and which are 5 V-tolerant?
The LQFP32 package provides 25 general-purpose I/O pins (PA0–PA15, PB0–PB12, excluding PA13–PA15 used for SWD). Of these, all GPIOs except those assigned to USB (PA11/PA12) and oscillator inputs (PH0/PH1, not present in LQFP32) are 5 V-tolerant, simplifying interface design with legacy 5 V peripherals and reducing level-shifter count.
Is hardware parity implemented across all SRAM, and how is it applied?
Hardware parity is implemented only on the first 8 KB of the 40 KB SRAM block (SRAM1), covering critical data structures like stack, heap, and firmware state variables. Parity bits are generated and checked automatically on every read/write access, triggering a HardFault on single-bit errors - providing detectable integrity protection aligned with IEC 61508 SIL-2 requirements without software overhead.
STM32L412K8T6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-LQFP
- Series:
- STM32L4
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M4
- Core Size:
- 32-Bit Single-Core
- Speed:
- 80MHz
- Connectivity:
- I2C, Infrared, IrDA, LINbus, Quad SPI, SPI, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, PWM, WDT
- Number of I/O:
- 26
- Program Memory Size:
- 64KB (64K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 40K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 3.6V
- Data Converters:
- A/D 10x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L412K8T6 FAQ
1.How can I place an order for STM32L412K8T6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L412K8T6 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM32L412K8T6 reliable?
The price and inventory of STM32L412K8T6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L412K8T6 is usually 5 days.
3.What payment methods are accepted for STM32L412K8T6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L412K8T6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L412K8T6?
STM32L412K8T6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L412K8T6 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM32L412K8T6?
For technical support, including STM32L412K8T6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L412K8T6 requirements.
6.How does Aetrix verify that STM32L412K8T6 is sourced from the original manufacturer or authorized distributors?
All STM32L412K8T6 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM32L412K8T6 meets industry standards.
7.What is the process for return or replacement of STM32L412K8T6?
All STM32L412K8T6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L412K8T6, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM32L412K8T6 part is unused and in its original packaging.
Return procedure for STM32L412K8T6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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