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STMicroelectronics STM32L432KCU3
- Part No.:
- STM32L432KCU3
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM32L432KCU3.pdf
- Description:
- IC MCU 32BIT 256KB FLSH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:3,883
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Product details
Overview
STM32L432KCU3 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 256 KB Flash, 64 KB SRAM, USB FS, and integrated analog peripherals including 12-bit ADC (5 Msps), dual 12-bit DACs, op-amp with PGA, and two ultra-low-power comparators - deployed in battery-powered industrial sensors and portable medical monitors.
For engineers reviewing the STM32L432KCU3 datasheet, STM32L432KCU3 pinout, STM32L432KCU3 application, or STM32L432KCU3 equivalent, key selection criteria include shutdown current (8 nA), Stop 2 mode power (1.0 µA), RTC-enabled standby (280 nA), and USB crystal-less full-speed support for space-constrained embedded designs.
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 arbitration. It supports dual PLLs - one for system clock and USB, another for audio/ADC - and includes a dedicated low-power timer (LPTIM) operational in Stop 2 mode.
Clock architecture combines internal oscillators (HSI16 ±1%, MSI auto-trimmed to ±0.25%, HSI48 for USB) with external options (LSE 32.768 kHz, HSE up to 48 MHz). Power management implements FlexPowerControl with five low-power modes, including Shutdown (8 nA), Standby (28 nA), and Stop 2 (1.0 µA), all supporting configurable wakeup sources and BOR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M4 with FPU, 80 MHz max, 100 DMIPS - enables real-time DSP and floating-point control loops without external coprocessor |
| Flash / SRAM | 256 KB single-bank Flash with readout protection; 64 KB SRAM (16 KB with hardware parity) - supports secure firmware storage and safety-critical data integrity |
| Ultra-Low-Power Modes | 8 nA Shutdown (2 wakeup pins); 1.0 µA Stop 2 mode; 280 nA Standby with RTC - extends coin-cell battery life to >10 years in periodic-sensing applications |
| Analog Peripherals | 1× 12-bit ADC @ 5 Msps (200 µA/Msps); 2× 12-bit DACs; 1× op-amp with programmable gain amplifier; 2× ultra-low-power comparators - enables sensor signal conditioning and analog output without external components |
| Communication | USB 2.0 FS crystal-less; CAN 2.0B; SAI; 3× USART + LPUART; 2× I²C FM+; 2× SPI + Quad-SPI - supports mixed-signal connectivity in constrained IoT edge nodes |
| Timers & RTC | 11 timers including advanced TIM1, dual LPTIMs active in Stop 2, HW calendar RTC with calibration - delivers precise timekeeping and motor/signal timing under ultra-low power |
| Package | UFQFPN32 (5 × 5 mm, 0.5 mm pitch) - surface-mount footprint compatible with automated assembly and high-density PCB layouts |
Pinout & Package
UFQFPN32 package: 32-pin, 5 × 5 mm body, 0.5 mm pitch, exposed thermal pad, RoHS-compliant and ECOPACK2® certified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual 1.71–3.6 V supply domain with independent analog/digital regulation - enables clean ADC/DAC operation and robust noise immunity |
| PA0–PA15, PB0–PB11 | General-purpose I/O | Up to 26 fast I/Os, most 5 V-tolerant - simplifies level-shifting in mixed-voltage systems and supports direct connection to legacy peripherals |
| PA11/PA12 | USB D+/D− | Crystal-less USB FS interface with built-in transceiver and LPM - eliminates external crystal and reduces BOM cost and board area |
| PC13–PC15 | RTC/LSE pins | Supports 32.768 kHz external crystal for precision RTC calendar and alarm functions - critical for time-stamped logging and scheduled wakeups |
| VREF+, VREF−, VBAT | Analog reference & backup supply | Enables accurate ADC/DAC referencing and RTC retention during main power loss - ensures continuity in battery-backed monitoring |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Five configurable low-power modes with sub-µA currents and <4 µs wakeup - enables responsive, energy-proportional operation in intermittent-sensing systems |
| ART Accelerator™ | Zero-wait-state Flash execution at 80 MHz - eliminates performance penalty of on-chip code storage while maintaining ultra-low active power |
| Integrated analog front-end | Single-chip solution with ADC, DACs, op-amp, comparators, and temperature sensor - reduces external component count and PCB area by ≥30% vs discrete solutions |
| USB crystal-less full-speed | On-die 48 MHz oscillator with clock recovery (CRS) - removes 12 MHz crystal and matching capacitors, lowering BOM cost and layout complexity |
| Hardware security | Proprietary code readout protection, 96-bit unique ID, CRC calculation unit - provides foundational firmware IP protection and device authentication capability |
Applications
| Industrial Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Wireless temperature/humidity node powered by CR2032 battery, transmitting data every 5 minutes via BLE gateway. IC Role / Device Role / Timing Role: Main controller executing sensor acquisition, USB-based firmware updates, and RTC-triggered wakeup - manages power budget and timing synchronization. Use Value: 8 nA shutdown and 1.0 µA Stop 2 mode extend battery life beyond 5 years; integrated op-amp conditions thermistor signals without external amplification. | Use Scenario: Handheld ECG recorder with analog front-end, display, and USB charging/data export. IC Role / Device Role / Timing Role: System-on-chip handling analog signal chain (ADC + op-amp + DAC), USB FS data streaming, and real-time waveform rendering - replaces multi-chip architecture. Use Value: Dual 12-bit DACs generate precise calibration references; crystal-less USB enables compact form factor and eliminates crystal aging drift in clinical-grade devices. |
| Smart Utility Meter | Asset Tracking Beacon |
Use Scenario: Battery-operated water/gas meter with pulse counting, tamper detection, and NB-IoT backhaul. IC Role / Device Role / Timing Role: Low-power host managing metrology peripherals, secure boot, and LPUART communication with modem - ensures regulatory compliance and long service intervals. Use Value: 280 nA RTC-enabled standby maintains calendar and alarms during 10-year deployment; hardware CRC and memory protection meet IEC 62056 security requirements. | Use Scenario: GPS-denied indoor asset tag using BLE and accelerometer, reporting location via Wi-Fi gateway at motion-triggered intervals. IC Role / Device Role / Timing Role: Motion-aware controller using LPTIM2 and COMP to detect vibration events and initiate low-power sensing sequence - minimizes average current draw. Use Value: Ultra-low-power comparators enable sub-µA always-on motion detection; 4 µs wakeup from Stop mode ensures rapid response to movement without latency penalty. |
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 |
|---|---|---|---|
| STM32L433RCT6 | 64-pin LQFP, 256 KB Flash, 64 KB SRAM, adds LCD controller and additional ADC channel - larger package and higher pin count | Suitable for GUI-enabled HMI applications requiring segment LCD drive; not drop-in due to package and pinout mismatch | Select when display integration or extra analog channels are required; avoid for space-constrained designs targeting UFQFPN32 footprint |
| STM32L412KBU3 | Same UFQFPN32 package, but 128 KB Flash, 40 KB SRAM, no SAI or CAN, lower USB performance - reduced feature set and memory | Targeted at simpler sensor nodes without audio or fieldbus connectivity; lower cost and power in minimal-feature use cases | Choose for cost-sensitive, non-USB-audio/non-CAN applications where 128 KB Flash suffices; verify ADC/DAC count matches design needs |
Compared with STM32L433RCT6, the STM32L432KCU3 offers identical core/peripheral specs in a smaller 32-pin package ideal for miniaturized designs; versus STM32L412KBU3, it provides double Flash/SRAM, SAI, CAN, and enhanced analog - justifying its use in feature-rich, size-constrained edge devices.
Availability
STM32L432KCU3 is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, smart utility meters, and asset tracking beacons requiring stable component supply across multi-year production cycles.
Supply support for STM32L432KCU3 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 ICs, sensors, and analog products for industrial, automotive, and consumer markets.
The STM32L4 series targets ultra-low-power embedded applications demanding high performance per µA, with emphasis on battery longevity, security, and analog integration - optimized for intelligent edge endpoints in Industry 4.0 and digital health.
FAQ
What is the maximum operating frequency and corresponding performance metric?
The STM32L432KCU3 operates at up to 80 MHz with an Arm Cortex-M4 core featuring FPU and ART Accelerator™, delivering 100 DMIPS and 273.55 CoreMark® (3.42 CoreMark/MHz). This performance level supports real-time control algorithms, sensor fusion, and lightweight protocol stacks without compromising ultra-low-power operation.
Does the part support crystal-less USB Full-Speed operation?
Yes - the STM32L432KCU3 integrates an on-die 48 MHz HSI48 oscillator with Clock Recovery System (CRS), enabling USB 2.0 Full-Speed operation without an external crystal. This eliminates two passive components and associated layout constraints while maintaining ±0.25% accuracy over voltage and temperature.
What are the lowest power consumption modes and their typical currents?
The lowest power modes are Shutdown (8 nA), Standby (28 nA), and Stop 2 (1.0 µA). Shutdown retains no state but supports two wakeup pins; Standby retains RTC and 16-byte backup registers; Stop 2 retains full SRAM and register context with RTC active - all validated per DS11451 Rev 4 electrical characteristics tables.
How many analog-to-digital converter channels does it support, and what is its sampling rate?
The integrated 12-bit ADC supports up to 16 external channels and achieves 5 Msps (mega-samples per second) with hardware oversampling up to 16-bit resolution. Its 200 µA/Msps efficiency and independent analog supply ensure high SNR in mixed-signal environments without degrading digital subsystem performance.
STM32L432KCU3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-UFQFN Exposed Pad
- Series:
- STM32L4
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M4
- Core Size:
- 32-Bit Single-Core
- Speed:
- 80MHz
- Connectivity:
- CANbus, I2C, IrDA, LINbus, QSPI, SAI, SPI, SWPMI, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, PWM, WDT
- Number of I/O:
- 26
- Program Memory Size:
- 256KB (256K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 64K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 3.6V
- Data Converters:
- A/D 10x12b; D/A 2x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L432KCU3 FAQ
1.How can I place an order for STM32L432KCU3 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L432KCU3 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 STM32L432KCU3 reliable?
The price and inventory of STM32L432KCU3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L432KCU3 is usually 5 days.
3.What payment methods are accepted for STM32L432KCU3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L432KCU3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L432KCU3?
STM32L432KCU3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L432KCU3 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 STM32L432KCU3?
For technical support, including STM32L432KCU3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L432KCU3 requirements.
6.How does Aetrix verify that STM32L432KCU3 is sourced from the original manufacturer or authorized distributors?
All STM32L432KCU3 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 STM32L432KCU3 meets industry standards.
7.What is the process for return or replacement of STM32L432KCU3?
All STM32L432KCU3 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L432KCU3, 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 STM32L432KCU3 part is unused and in its original packaging.
Return procedure for STM32L432KCU3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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