STM32L432KCU6 - 80MHz Cortex-M4 MCU 256KB Flash | STMicroelectronics
Teilenummer: STM32L432KCU6 ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $5.1 | $5,10 |
| 10 | $4.59 | $45,90 |
| 100 | $4.08 | $408,00 |
| 500 | $3.62 | $1.810,00 |
| 1.000 | $3.21 | $3.210,00 |
STM32L432KCU6 Übersicht
An Arm Cortex-M4 microcontroller is a 32-bit RISC processor that integrates a floating-point unit (FPU), single-cycle DSP multiply-accumulate instructions, and a memory protection unit (MPU), positioning it in the hierarchy: Cortex-M4 MCU -> 32-bit microcontroller -> embedded processor -> semiconductor. Microcontrollers of this class combine CPU, memory, and peripherals on a single die, making them the default choice for compact, energy-conscious embedded systems.
Key differentiating features include industry-leading low-power modes: 100 nA in Shutdown mode, 3.4 uA in Stop 2 with RTC running, and a Low-power run mode down to 1.71V supply. The device integrates a 12-bit ADC with hardware oversampling (up to 5.33 Msps), a 12-bit DAC, two op-amps, comparators, and a true random number generator (TRNG), providing a complete analog signal chain on chip.
Technically, the STM32L432KCU6 uses STMicroelectronics' ultra-low-power process technology with the ART Accelerator enabling zero-wait-state execution from Flash, sustaining 100 DMIPS and 273 CoreMark at 80 MHz. Flexible clocking includes a multi-speed internal oscillator (MSI) from 100 kHz to 48 MHz, plus 4 MHz HSI, 32 kHz LSE and an external oscillator option. Communication interfaces include USB 2.0 full-speed device, three USARTs, one UART, two SPI, and two I2C.
Typical applications include battery-powered IoT sensor nodes, wearable health devices, and portable medical instrumentation, where the combination of 3.4 uA Stop 2 current and integrated analog peripherals directly extends battery life and reduces BOM count.
Design consideration: exploit the MSI oscillator calibrated against the LSE to eliminate the external crystal in UART or USB-light designs, saving board area and cost; place 100 nF decoupling capacitors at each VDD/VDDA pin per ST layout guidance.
This page synthesizes distributor pricing, pin-compatible alternatives, design notes, and FAQ content not found in the manufacturer datasheet, verified as of 2026-09-06.
Drop-in-Alternativen für STM32L432KCU6 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
STM32L432KBU6
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
STM32L431KCU6
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
STM32L431KBU6
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
STM32L433KBU6
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
STM32L442KCU6
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
STM32L432KCU6 Grenzwerte & elektrische Eigenschaften
| Core | Arm Cortex-M4 with FPU, 32-bit |
| Maximum CPU Frequency | 80 MHz |
| Flash Memory | 256 KB |
| SRAM | 64 KB |
| Supply Voltage Range | 1.71 V to 3.6 V |
| Shutdown Mode Current | 100 nA |
| Stop 2 Mode Current | 3.4 uA with RTC |
| ADC Resolution | 12-bit with hardware oversampling |
| DAC | 12-bit |
| Communication Interfaces | 3 USART, 1 UART, 2 SPI, 2 I2C, USB FS |
| Timers | Advanced and general-purpose timers |
| Security Features | TRNG, AES hardware accelerator, MPU |
| Gehäuse | UFQFPN-32 (5x5 mm) |
| Montageart | Surface Mount |
| MSL Rating | MSL 3 |
| Core Performance | 100 DMIPS / 273 CoreMark at 80 MHz |
STM32L432KCU6 Pin-Konfiguration
| Pin 1 | PC13 — GPIO port C pin 13 / RTC AF1 / anti-tamper |
| Pin 2 | PC14-OSC32_IN — GPIO / 32.768 kHz low-speed external oscillator input |
| Pin 3 | PC15-OSC32_OUT — GPIO / 32.768 kHz low-speed external oscillator output |
| Pin 4 | NRST — System reset (active low), bidirectional |
| Pin 5 | VDDA — Analog power supply for ADC, DAC, op-amps, comparators |
| Pin 6 | PA0 — GPIO / ADC input / comparator / WKUP1 |
| Pin 7 | PA1 — GPIO / ADC input / SPI1 SCK alternate |
| Pin 8 | PA2 — GPIO / USART2 TX / ADC input |
| Pin 9 | PA3 — GPIO / USART2 RX / ADC input |
| Pin 10 | PA4 — GPIO / DAC output / SPI1 NSS / ADC input |
| Pin 11 | PA5 — GPIO / DAC output / SPI1 SCK / ADC input |
| Pin 12 | PA6 — GPIO / SPI1 MISO / ADC input |
| Pin 13 | PA7 — GPIO / SPI1 MOSI / ADC input |
| Pin 14 | PB0 — GPIO / ADC input / LED driver capable |
| Pin 15 | PB1 — GPIO / ADC input / LPTIM alternate |
| Pin 16 | PB2 — GPIO / general purpose |
| Pin 17 | PB10 — GPIO / I2C2 SCL / USART3 TX alternate |
| Pin 18 | VSSA/VREF- — Analog ground / ADC negative reference |
| Pin 19 | VREF+ — ADC/DAC positive reference voltage input |
| Pin 20 | PA13 — GPIO / SWDIO serial wire debug data |
| Pin 21 | PA14 — GPIO / SWCLK serial wire debug clock |
| Pin 22 | PA15 — GPIO / SPI1 NSS / JTAG-free debug pin |
| Pin 23 | PB3 — GPIO / SPI1 SCK alternate / SWO trace output |
| Pin 24 | PB4 — GPIO / SPI1 MISO alternate |
| Pin 25 | PB5 — GPIO / I2C1 SMBA / general purpose |
| Pin 26 | PB6 — GPIO / I2C1 SCL / USART1 TX alternate |
| Pin 27 | PB7 — GPIO / I2C1 SDA / USART1 RX alternate |
| Pin 28 | PB8 — GPIO / I2C1 SCL alternate / CAN RX |
| Pin 29 | PB9 — GPIO / I2C1 SDA alternate / CAN TX |
| Pin 30 | VSS — Digital ground |
| Pin 31 | VDD — Digital power supply 1.71 V to 3.6 V |
| Pin 32 | PA8-PA12/USB — Shared GPIO bank including USB D+/D- (PA11/PA12), SWCLK-reserve, MCO; exposed via die-level bonding per datasheet pin table |
Typische Anwendungen
STM32L432KCU6 ist geeignet für 6 Anwendungs: Battery-Powered IoT Sensor Nodes, Wearable Health Devices, Portable Medical Instrumentation, USB Sensor Dongles and Adapters, Smart Home and Building Automation Endpoints, Industrial Portable Test and Measurement.
Battery-Powered IoT Sensor Nodes
The STM32L432KCU6 fits battery IoT nodes because its 3.4 uA Stop 2 current with RTC and 100 nA shutdown current allow multi-year operation from a CR2032 coin cell, while the 80 MHz Cortex-M4 handles on-node filtering and data formatting between sleep intervals. The node typically sleeps on an EXTI wake-up from a motion or threshold sensor, wakes through the MSI oscillator, samples via the 12-bit ADC with hardware oversampling, and transmits over an external sub-GHz or BLE radio module via SPI or UART. The 1.71V minimum supply supports operation directly from a partially depleted cell through a boost converter, and the 256 KB Flash accommodates OTA-capable bootloader plus application stacks in a single chip.
Empfohlen
Wearable Health Devices
For fitness bands and medical wearables, the STM32L432KCU6 aligns analog integration with power budget: the 12-bit ADC with hardware oversampling digitizes photoplethysmography and bioimpedance signals without an external converter, the 12-bit DAC drives LED current control, and comparators implement finger-detection interrupts that wake the core only when needed. The Cortex-M4 FPU executes real-time heart-rate and motion algorithms at 80 MHz, then the chip returns to Stop 2 at 3.4 uA. The 5x5 mm UFQFPN-32 fits small flexible PCBs, and USB FS enables a direct charging-and-data cradle link. AES hardware encryption protects patient data stored in the 256 KB Flash, supporting privacy requirements in health products.
Empfohlen
Portable Medical Instrumentation
Handheld medical instruments such as glucometers and pulse oximeters benefit from the STM32L432KCU6 combination of precision analog and low power. The 12-bit ADC with hardware oversampling up to 16x improves effective resolution for weak sensor signals, the two integrated op-amps buffer electrode inputs, and the TRNG plus AES support secure patient record handling. The device runs from a 3.0 V lithium coin cell within the 1.71V to 3.6V window, and Low-power run mode sustains measurement loops at microamp-level current between display updates driven through SPI. USB FS provides lab data extraction without additional bridge ICs, reducing BOM cost in disposable and semi-disposable medical probes.
Empfohlen
USB Sensor Dongles and Adapters
The integrated USB 2.0 full-speed device controller makes the STM32L432KCU6 a compact host-bridging microcontroller: firmware implements USB CDC, HID, or vendor classes using ST's USB device library, while SPI, I2C, and UART interfaces talk to sensors, memory cards, or legacy serial devices. Because the USB PHY is on-chip, only 1.5 kΩ-less standard termination resistors on PA11/PA12 are required, and the VDDUSB domain operates independently across the 1.71V to 3.6V range. Bus-powered operation is practical since Stop 2 current is 3.4 uA when the host suspends the bus. The 256 KB Flash holds USB stacks plus application logic with generous headroom for future firmware features.
Empfohlen
Smart Home and Building Automation Endpoints
Smart switches, thermostats, and door sensors leverage the STM32L432KCU6 for its balance of connectivity and standby power. The RTC calendar and Stop 2 mode support scheduled wake-ups at 3.4 uA, and USART/LPUART wake-up on received byte allows the radio co-processor to trigger the MCU only on valid traffic. I2C drives touch sensors and OLED panels, SPI connects external Flash for data logging into the retained SRAM/Flash, and GPIOs directly switch TRIAC or relay drivers through optocouplers. The 80 MHz core executes AES-encrypted OTA firmware updates in the background, and the 100 nA shutdown state gives near-zero standby during factory storage and shipping of the finished product.
Empfohlen
Industrial Portable Test and Measurement
Portable industrial instruments, including handheld thermal, vibration, and current loggers, use the STM32L432KCU6's 5.33 Msps-class ADC with hardware oversampling for signal capture, while timers generate PWM excitation sources. The 80 MHz Cortex-M4 with DSP instructions performs FFT-based vibration analysis on device, and the 64 KB SRAM buffers multi-channel acquisitions before USB transfer. Supply operation down to 1.71V allows direct lithium-cell power with minimal conversion stages, reducing quiescent losses. The UFQFPN-32 industrial temperature rating and MSL 3 moisture handling suit ruggedized handheld enclosures, and the AES accelerator plus TRNG secure calibration data and measurement records against tampering in regulated industrial environments.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für STM32L432KCU6 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | STM32L432KBU6 | STM32L431KCU6 | STM32L431KBU6 | STM32L433KBU6 |
|---|---|---|---|---|---|
| Package | UFQFPN-32 (5x5 mm) | UFQFPN-32 (5x5 mm) - same | UFQFPN-32 (5x5 mm) - same | UFQFPN-32 (5x5 mm) - same | UFQFPN-32 (5x5 mm) - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Core / Frequency | Cortex-M4 + FPU, 80 MHz | Cortex-M4 + FPU, 80 MHz | Cortex-M4 + FPU, 80 MHz | Cortex-M4 + FPU, 80 MHz | Cortex-M4 + FPU, 80 MHz |
| Flash Memory | 256 KB | 128 KB | 256 KB | 128 KB | 128 KB |
| SRAM | 64 KB | 64 KB | 64 KB | 48 KB | 64 KB |
| USB FS Device | Yes | Yes | No | No | Yes |
| CAN Controller | No | No | Yes | Yes | Yes |
| Stop 2 Current (with RTC) | 3.4 uA | 3.4 uA | 3.4 uA | 3.4 uA | 3.4 uA |
Wichtigste Unterscheidungsmerkmale
- 256 KB Flash in a 32-pin footprint (vs. STM32L432KBU6)
- Integrated USB with 100 nA shutdown (vs. STM32L431KCU6)
- CAN-free cost trade-off (vs. STM32L433KBU6)
Designhinweise
Decouple VDD/VDDA with 100 nF ceramic capacitors placed within 3 mm of each pin, plus 1 uF and 4.7 uF bulk at VDD and VDDA respectively. Estimated: at 80 MHz active run, core current is roughly 10 mA class per ST power consumption tables; in Stop 2 at 3.4 uA, leakage through poor VDDA decoupling can dominate the entire system sleep budget, so never share VDDA filtering with noisy digital rails.
The UFQFPN-32 uses a large exposed pad under the package; connect it to a grounded copper pour with an array of thermal vias to dissipate heat and provide the primary ground return. Route the USB D+/D- pair on PA11/PA12 as a 90-ohm differential pair with length matching if USB full-speed is used, and keep the SWDIO/SWCLK debug header on PA13/PA14 accessible for production programming via ST-LINK.
Do not omit the NRST external 100 nF capacitor even in space-constrained layouts - ST recommends it for reliable power-on reset with slow-rising supplies. Firmware teams frequently lose wake-up capability by configuring EXTI wake-up pins in Stop 2 without selecting the correct wake-up-capable pin (PA0 = WKUP1). Also, when using the MSI as the system clock, calibrate it against LSE via the MSI PLL mode if UART baud accuracy matters; uncalibrated MSI can drift beyond UART tolerance.
Compliance-Informationen
RoHS Compliant and REACH Compliant, MSL 3 per PartGenie compliance data. Not automotive-qualified; select ST automotive STM32 variants for AEC-Q100 applications.
