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STMicroelectronics STM32L412KBU3TR
- Part No.:
- STM32L412KBU3TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM32L412KBU3TR.pdf
- Description:
- IC MCU 32BIT 128KB FLSH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:2,948
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Product details
Overview
STM32L412KBU3TR 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 sensor nodes, portable medical devices, and energy-harvesting systems.
For engineers reviewing the STM32L412KBU3TR datasheet, STM32L412KBU3TR pinout, STM32L412KBU3TR application, or STM32L412KBU3TR equivalent, key selection criteria include verified ultra-low-power modes (e.g., 245 nA Standby with RTC), LPUART wake-up capability in Stop 2 mode, Quad SPI XIP support, and hardware parity on 8 KB SRAM - all confirmed in DS12469 Rev 9.
Technical Context
This MCU implements the Arm Cortex-M4 core with FPU and Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from flash at 80 MHz. Its FlexPowerControl architecture integrates multiple low-power modes - Shutdown (16 nA), Standby with RTC (245 nA), and Stop 2 (0.7 µA) - each validated with specific wakeup latency (e.g., 4 µs from Stop).
The analog subsystem includes two independent 12-bit ADCs (5 Msps, hardware oversampling to 16-bit), a rail-to-rail op-amp with programmable gain, and a comparator with window mode - all supplied from a dedicated analog domain (VDDA) decoupled from digital supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M4 with FPU and DSP instructions; enables real-time signal processing in sensor fusion or motor control without external coprocessor. |
| Max Clock Frequency | 80 MHz; delivers 100 DMIPS and 273.55 CoreMark® (3.42 CoreMark/MHz), validated with ART Accelerator enabled. |
| Flash / SRAM | 128 KB single-bank flash with readout protection; 40 KB SRAM (8 KB with hardware parity) - ensures code integrity and data reliability in safety-aware designs. |
| Ultra-Low-Power Modes | 245 nA Standby with RTC + 32×32-bit backup registers; 0.7 µA Stop 2 mode; 4 µs wakeup - critical for multi-year battery life in wireless sensors. |
| Analog Peripherals | Dual 12-bit ADCs (5 Msps, 200 µA/Msps); 1 op-amp with built-in PGA; 1 ultra-low-power comparator - supports precision analog front-end without external components. |
| Communication Interfaces | USB 2.0 full-speed (crystal-less), 3× I²C (FM+), 3× USART, 1× LPUART (Stop 2 wake-up), 2× SPI, 1× Quad SPI (XIP capable) - enables flexible connectivity in constrained edge nodes. |
| Package | UFBGA64 (5 × 5 mm, 0.5 mm pitch); 64-pin ball grid array with ECOPACK2 compliance and industrial temperature range (–40 °C to +85 °C). |
Pinout & Package
STM32L412KBU3TR uses the UFBGA64 package (5 × 5 mm, 0.5 mm pitch), qualified for industrial temperature range (–40 °C to +85 °C) and compliant with ECOPACK2 environmental standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Digital power supply | 1.71–3.6 V main supply; supports external SMPS input via VDD12 for sub-µA run-mode efficiency. |
| VDDA | Analog power supply | Independent 1.62–3.6 V supply for ADC/OPAMP/COMP; enables noise isolation and stable reference operation. |
| VBAT | Backup power supply | Supplies RTC and 32×32-bit backup registers at 1.65–3.6 V; draws only 300 nA in VBAT mode. |
| PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD2, PF0–PF1 | General-purpose I/Os | Up to 52 fast I/Os (most 5 V-tolerant); support 12-channel capacitive sensing (TSC) and multiple AF configurations per pin. |
| PA2/PA3 | LPUART_TX/LPUART_RX | Dedicated low-power UART pins active in Stop 2 mode; enable wake-up from deep sleep using asynchronous serial traffic. |
| PC13/PC14/PC15 | RTC_OUT/OSC32_IN/OSC32_OUT | Support 32 kHz crystal for hardware calendar and alarm functions; essential for time-stamped sensor logging. |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Validated ultra-low-power states: 16 nA Shutdown, 245 nA Standby with RTC, 0.7 µA Stop 2 - enables >10-year battery life in coin-cell-powered devices. |
| ART Accelerator™ | Enables zero-wait-state execution from flash at 80 MHz; eliminates external RAM dependency for deterministic real-time response. |
| Quad SPI with XIP | Direct execute-in-place from external QSPI flash; reduces BOM cost and PCB footprint vs. parallel NOR/NAND interfaces. |
| Hardware CRC & RNG | On-the-fly CRC-32 computation and true random number generation - supports secure firmware updates and cryptographic key derivation. |
| Capacitive Sensing Controller (TSC) | 12-channel touch-sensing interface supporting touchkey, linear, and rotary sensors - enables intuitive HMI without external ICs. |
Applications
| Smart Wearable Sensor Hub | Wireless Industrial Node |
|---|---|
Use Scenario: Compact wearable device collecting ECG, temperature, and motion data with BLE transmission. IC Role / Device Role / Timing Role: Primary MCU executing sensor fusion algorithms, managing USB charging, and controlling ultra-low-power sleep/wake cycles. Use Value: 245 nA Standby with RTC and 4 µs Stop-mode wakeup ensure multi-week runtime on a 100 mAh Li-ion cell while maintaining precise timestamping. | Use Scenario: Battery-powered vibration monitor mounted on rotating machinery in factory settings. IC Role / Device Role / Timing Role: Edge-processing node acquiring accelerometer data via ADC, performing FFT-based anomaly detection, and transmitting alerts via LPUART to gateway. Use Value: Dual 12-bit ADCs (5 Msps) and hardware oversampling enable high-fidelity signal capture; LPUART wake-up from Stop 2 minimizes average current to <1 µA. |
| Portable Medical Diagnostic Tool | Energy-Harvesting Environmental Monitor |
Use Scenario: Handheld pulse oximeter with optical sensing, display, and rechargeable battery. IC Role / Device Role / Timing Role: System controller integrating OPAMP-based transimpedance amplification, ADC digitization, and OLED display timing via SPI. Use Value: Integrated op-amp with PGA eliminates discrete gain stage; 8 KB SRAM with hardware parity ensures reliable waveform buffer storage during intermittent power. | Use Scenario: Solar- or thermal-harvested soil moisture and ambient temperature logger deployed remotely. IC Role / Device Role / Timing Role: Power-aware host managing energy harvesting PMIC, sampling sensors in burst mode, and storing logs in Quad SPI flash. Use Value: External SMPS support (VDD12 = 1.1 V) achieves 28 µA/MHz run-mode efficiency; VBAT mode preserves RTC and calibration data during energy droughts. |
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 UFBGA64 package; adds AES-256 crypto accelerator and USB DFU bootloader; 256 KB flash, 64 KB SRAM. | Better suited for secure firmware OTA updates and higher memory footprint applications (e.g., TLS stack). | Select when cryptographic acceleration or >128 KB flash is required; otherwise STM32L412KBU3TR offers lower cost and identical low-power performance. |
| STM32L072KBU3 | Cortex-M0+ core (32 MHz, 37 DMIPS); 128 KB flash, 20 KB SRAM; lower active power but no FPU or ART Accelerator. | Targeted at simpler control tasks without DSP or floating-point math (e.g., basic timer-based actuation). | Choose for cost-sensitive, non-DSP applications where 80 MHz throughput and 100 DMIPS are unnecessary. |
Compared with STM32L432KCU6, the STM32L412KBU3TR trades crypto acceleration and extra memory for lower unit cost and identical ultra-low-power metrics; versus STM32L072KBU3, it delivers 2.7× higher compute throughput and integrated FPU - essential for sensor fusion or predictive maintenance algorithms.
Availability
STM32L412KBU3TR is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, portable medical diagnostics, and energy-harvesting environmental monitors requiring stable component supply across long production lifecycles.
Supply support for STM32L412KBU3TR 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, specializing in microcontrollers, power management, and analog/mixed-signal ICs for industrial, automotive, and consumer markets.
The STM32L4 series is designed for ultra-low-power embedded applications demanding high performance-per-microwatt, targeting smart sensors, wearables, and battery-constrained edge devices with rich peripheral integration.
FAQ
What is the maximum operating frequency and associated performance metric of the STM32L412KBU3TR?
The STM32L412KBU3TR operates at up to 80 MHz with the Arm Cortex-M4 core and FPU. Its performance is quantified at 100 DMIPS (Dhrystone 2.1) and 273.55 CoreMark® (3.42 CoreMark/MHz), both measured with ART Accelerator enabled and zero-wait-state flash execution per DS12469 Rev 9.
Does the STM32L412KBU3TR support external SMPS, and how does it affect power consumption?
Yes - the device supports external SMPS via the VDD12 pin. In SMPS mode, active current drops to 28 µA/MHz (vs. 79 µA/MHz in LDO mode) at 3.3 V, and Stop 2 mode reaches 0.7 µA. This configuration is validated in Tables 25–26 and Section 3.9.3 of DS12469 Rev 9.
Which low-power modes support RTC operation and wakeup capability, and what are their typical currents?
Standby mode with RTC draws 245 nA, and Stop 2 mode (with RTC enabled) consumes 0.7 µA. Both support wakeup via PA2/PA3 (LPUART), PC13 (RTC alarm), or EXTI lines. These values are specified in Table 43 (Stop 2) and Table 46 (Standby) of DS12469 Rev 9.
What analog peripherals are integrated, and are they electrically isolated from the digital domain?
The device integrates two 12-bit ADCs (5 Msps), one rail-to-rail op-amp with programmable gain amplifier (PGA), and one ultra-low-power comparator - all powered by the dedicated VDDA supply (1.62–3.6 V). This independent analog domain is decoupled from VDD per Section 3.9.1 and Table 18 of DS12469 Rev 9.
STM32L412KBU3TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-UFQFN Exposed Pad
- Series:
- STM32L4
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Core Processor:
- ARM® Cortex®-M4
- Core Size:
- 32-Bit Single-Core
- Speed:
- 80MHz
- Connectivity:
- I2C, Infrared, IrDA, LINbus, QSPI, SPI, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, PWM, Temp Sensor, WDT
- Number of I/O:
- 26
- Program Memory Size:
- 128KB (128K 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 SAR
- Oscillator Type:
- External, Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L412KBU3TR FAQ
1.How can I place an order for STM32L412KBU3TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L412KBU3TR 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 STM32L412KBU3TR reliable?
The price and inventory of STM32L412KBU3TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L412KBU3TR is usually 5 days.
3.What payment methods are accepted for STM32L412KBU3TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L412KBU3TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L412KBU3TR?
STM32L412KBU3TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L412KBU3TR 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 STM32L412KBU3TR?
For technical support, including STM32L412KBU3TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L412KBU3TR requirements.
6.How does Aetrix verify that STM32L412KBU3TR is sourced from the original manufacturer or authorized distributors?
All STM32L412KBU3TR 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 STM32L412KBU3TR meets industry standards.
7.What is the process for return or replacement of STM32L412KBU3TR?
All STM32L412KBU3TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L412KBU3TR, 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 STM32L412KBU3TR part is unused and in its original packaging.
Return procedure for STM32L412KBU3TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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