STM32L432KCU6 - Ultra-Low-Power ARM Cortex-M4 MCU | STMicroelectronics
MPN: STM32L432KCU6 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.5 | $4.50 |
| 10 | $4.05 | $40.50 |
| 100 | $3.6 | $360.00 |
| 500 | $3.24 | $1,620.00 |
| 1,000 | $2.88 | $2,880.00 |
Drop-in alternatives for STM32L432KCU6 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
STM32L432KCU6TR
β Drop-Inπ Reference alternative (not in catalog)
STM32L433KCU6
β Drop-Inπ Reference alternative (not in catalog)
STM32L431KCU6
β Drop-Inπ Reference alternative (not in catalog)
STM32L452KCU6
β Drop-Inπ Reference alternative (not in catalog)
STM32L432KCU6 Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M4 with FPU |
| Maximum Clock Frequency | 80 MHz |
| Flash Memory | 256 KB |
| SRAM | 64 KB |
| Supply Voltage Range | 1.71 V to 3.6 V |
| Package | UFQFPN-32 (5x5 mm) |
| Operating Temperature Range | -40C to +85C |
| Number of I/O Pins | 25 |
| ADC Resolution | 12-bit |
| DAC Resolution | 12-bit |
| Communication Interfaces | USART, SPI, I2C |
| Timers | Advanced, General-purpose, Basic |
| Low-Power Modes | Sleep, Low-power run, Low-power sleep, Stop 0/1/2, Standby, Shutdown |
| Shutdown Mode Current | 100 nA |
| Stop 2 Mode Current | 3.4 Β΅A (with RTC) |
| RoHS Status | Compliant |
STM32L432KCU6 Pin Configuration
| Pin 1 | VBAT β Battery backup supply |
| Pin 2 | PC14 β GPIO / OSC32_IN |
| Pin 3 | PC15 β GPIO / OSC32_OUT |
| Pin 4 | PH0 β GPIO / OSC_IN |
| Pin 5 | PH1 β GPIO / OSC_OUT |
| Pin 6 | NRST β Reset |
| Pin 7 | PC0 β GPIO / ADC |
| Pin 8 | PC1 β GPIO / ADC |
| Pin 9 | PC2 β GPIO / ADC |
| Pin 10 | PC3 β GPIO / ADC |
| Pin 11 | VDD β Power supply |
| Pin 12 | VSS β Ground |
| Pin 13 | PA0 β GPIO / ADC / DAC |
| Pin 14 | PA1 β GPIO / ADC / DAC |
| Pin 15 | PA2 β GPIO / USART |
| Pin 16 | PA3 β GPIO / USART |
| Pin 17 | PA4 β GPIO / SPI |
| Pin 18 | PA5 β GPIO / SPI |
| Pin 19 | PA6 β GPIO / SPI |
| Pin 20 | PA7 β GPIO / SPI |
| Pin 21 | PB0 β GPIO / ADC |
| Pin 22 | PB1 β GPIO / ADC |
| Pin 23 | PB2 β GPIO / BOOT1 |
| Pin 24 | PB10 β GPIO / I2C |
| Pin 25 | PB11 β GPIO / I2C |
| Pin 26 | PB12 β GPIO / SPI |
| Pin 27 | PB13 β GPIO / SPI |
| Pin 28 | PB14 β GPIO / SPI |
| Pin 29 | PB15 β GPIO / SPI |
| Pin 30 | PA8 β GPIO / MCO |
| Pin 31 | PA9 β GPIO / USART |
| Pin 32 | PA10 β GPIO / USART |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
STM32L432KCU6 is suitable for 6 applications: Wearable Devices, IoT Nodes, Medical Devices, Smart Sensors, Portable Instrumentation, Audio Processing.
Wearable Devices
The STM32L432KCU6 is ideal for wearable devices such as fitness trackers and smartwatches. Its ultra-low-power modes (down to 100 nA in Shutdown) extend battery life, while the 80 MHz Cortex-M4 core handles sensor data processing and connectivity. The small UFQFPN-32 package fits compact designs. In a typical fitness tracker, the MCU reads accelerometer and heart-rate sensor data, processes it, and communicates via BLE. The low-power modes allow the device to run for weeks on a small battery. Designers should optimize the use of Stop 2 mode to achieve minimal power consumption while maintaining RTC functionality.
Recommended
IoT Nodes
The STM32L432KCU6 is well-suited for IoT nodes that require low power and reliable connectivity. Its multiple communication interfaces (USART, SPI, I2C) allow easy integration with wireless modules like LoRa, BLE, or Wi-Fi. The device's low-power modes enable battery-powered operation for years. In a typical IoT sensor node, the MCU periodically wakes up, reads sensors, and transmits data via a LoRa module. The Stop 2 mode with RTC can be used to schedule wake-ups, consuming only 3.4 Β΅A. The 12-bit ADC and DAC are useful for analog sensor interfacing. Designers should ensure proper antenna placement and power supply decoupling for reliable wireless communication.
Recommended
Medical Devices
The STM32L432KCU6 is suitable for portable medical devices like glucose monitors and pulse oximeters. Its low power consumption and high processing capability enable accurate signal processing and long battery life. The device's analog peripherals (12-bit ADC, DAC) are essential for sensor signal conditioning. In a pulse oximeter, the MCU controls LED drivers, reads photodiode signals, and calculates SpO2 levels. The low-power modes allow continuous monitoring with minimal power draw. Designers should consider the device's operating temperature range (-40C to +85C) and ensure compliance with medical standards.
Recommended
Smart Sensors
The STM32L432KCU6 is perfect for smart sensors in industrial and building automation. Its rich peripheral set and low power consumption make it ideal for sensor nodes that process data locally and communicate over industrial networks. The device's 12-bit ADC and DAC allow direct interfacing with analog sensors. In a smart temperature sensor, the MCU reads a thermocouple via the ADC, linearizes the data, and transmits it over RS-485. The low-power modes enable battery or energy-harvesting operation. Designers should use the device's hardware oversampling to improve ADC resolution and reduce noise.
Recommended
Portable Instrumentation
The STM32L432KCU6 is used in portable test and measurement equipment such as handheld multimeters and data loggers. Its high processing speed and low power consumption enable accurate measurements and long battery life. The device's 12-bit ADC and DAC are key for signal acquisition and generation. In a handheld multimeter, the MCU controls the measurement front-end, processes the ADC data, and displays results on an LCD. The low-power modes allow the device to remain in standby for extended periods. Designers should pay attention to the ADC's reference voltage and use external precision references for high accuracy.
Recommended
Audio Processing
The STM32L432KCU6 can handle audio processing tasks such as voice recognition and audio playback. Its Cortex-M4 core with FPU and DSP instructions accelerates audio algorithms, while the 12-bit DAC can output analog audio. The device's low power consumption is beneficial for battery-powered audio devices. In a voice-controlled device, the MCU captures audio via a microphone, processes it with DSP algorithms, and triggers actions. The 12-bit DAC can generate simple audio tones. For higher quality audio, an external audio codec is recommended. Designers should optimize the clock configuration to achieve the required audio sampling rate.
Recommended
Recommended Products Summary
Engineering reference data for STM32L432KCU6 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM32L432KCU6TR | STM32L433KCU6 | STM32L431KCU6 | STM32L452KCU6 |
|---|---|---|---|---|---|
| Package | UFQFPN-32 | UFQFPN-32 | UFQFPN-32 | UFQFPN-32 | UFQFPN-32 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Core | ARM Cortex-M4 with FPU | ARM Cortex-M4 with FPU | ARM Cortex-M4 with FPU | ARM Cortex-M4 with FPU | ARM Cortex-M4 with FPU |
| Maximum Clock Frequency | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| Flash Memory | 256 KB | 256 KB | 256 KB | 256 KB | 512 KB |
| SRAM | 64 KB | 64 KB | 64 KB | 64 KB | 160 KB |
| DAC | 1 channel | 1 channel | 2 channels | None | 1 channel |
| Supply Voltage Range | 1.71V to 3.6V | 1.71V to 3.6V | 1.71V to 3.6V | 1.71V to 3.6V | 1.71V to 3.6V |
Key Differentiators
- Ultra-low-power modes with shutdown current of 100 nA (vs STM32L431KCU6)
- Integrated 12-bit DAC (vs STM32L431KCU6)
- Higher SRAM capacity (vs STM32L431KCU6)
Design Notes
The STM32L432KCU6 supports a wide supply voltage range of 1.71V to 3.6V. For battery-powered applications, use the low-power modes (Stop 2, Standby, Shutdown) to minimize current consumption. Ensure proper decoupling with 100 nF capacitors on each VDD pin and a 4.7 Β΅F capacitor on the main VDD. In Shutdown mode, the device draws only 100 nA, but the VBAT pin must be connected to a backup battery if RTC is needed.
For the UFQFPN-32 package, ensure the exposed pad is soldered to the PCB ground plane for thermal and electrical performance. Place decoupling capacitors close to the VDD pins. Use a ground plane to minimize noise and improve EMC. The device has an internal reset circuit, but an external capacitor on NRST is recommended for noise immunity.
Avoid exceeding the absolute maximum ratings, especially on VDD (max 3.6V) and I/O pins. When using the ADC, ensure the reference voltage is stable and use hardware oversampling for better resolution. The MSI oscillator can be used as the system clock, but for accurate timing, use an external crystal. Also, be aware that the BOOT0 pin is shared with PB2, so configure it correctly to avoid unintended boot mode changes.
Compliance Information
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified.
