Item specifics
Description
STM32L451CCU6 Product Overview
STM32L451CCU6 is an Arm Cortex-M4 MCU at 80 MHz with FPU and ART Accelerator, UFQFPN-48. 256 KB Flash, 160 KB SRAM, 12-bit ADC (10 ch), 12-bit DAC, two comparators, LP timers, RTC, 2×USART, 1×UART, 1×LPUART, 2×SPI/I2S, 3×I2C. Up to 38 x 5 V-tolerant I/Os. 1.71–3.6 V, -40–85 °C. Compared to the L431/L433 series, the STM32L451CCU6 forgoes USB and CAN interfaces while boosting SRAM to a generous 160 KB, purpose-built for battery-powered sensors, portable meters, and industrial measurement applications that need large data buffering without USB connectivity and are sensitive to power and cost.
STM32L451CCU6 Core Features
Core: The STM32L451CCU6 features an Arm Cortex-M4 core at 80 MHz, with FPU + ART Accelerator
Memory: The STM32L451CCU6 provides 256 KB Flash and 160 KB SRAM
Analog: 12-bit ADC (10 ch), 12-bit DAC, 2×Comparators
Connectivity: 2×USART, 1×UART, 1×LPUART, 2×SPI/I2S, 3×I2C
Timers: Advanced Timer, GP/LP Timers, RTC
I/Os: 38 (5 V-tolerant)
Package: UFQFPN-48
Temperature Range: -40°C to 85°C
STM32L451CCU6 Applications
Battery-Powered Sensors: The STM32L451CCU6 is ideal for wireless sensors needing large data buffering, such as environmental monitoring nodes
Portable Devices: Wearables and portable medical devices can leverage the STM32L451CCU6's 160 KB SRAM
Industrial Metering: Water, gas, and electricity meters are perfect applications for the STM32L451CCU6
Consumer Electronics: Remote controls, e-labels, smart cards
Energy Harvesting Applications: Self-powered sensor nodes and energy harvesting systems can rely on the STM32L451CCU6's ultra-low power consumption
STM32L451CCU6 Key Advantages
160 KB Large SRAM: The STM32L451CCU6 delivers class-leading memory capacity in this package for complex data processing and buffering
Cortex-M4 + FPU + Ultra-Low Power: The STM32L451CCU6 achieves excellent DSP and floating-point performance while maintaining extremely low power consumption
256 KB Flash + Flexible Storage: The STM32L451CCU6 provides ample program space for complex algorithms and protocol stacks
On-Chip DAC & Comparators: The STM32L451CCU6 offers analog output and signal threshold detection without external components
LPUART Low-Power Serial Interface: Supports asynchronous communication in low-power modes, further optimizing system power consumption
Ultra-Compact UFQFPN-48 Package: Significantly reduces PCB area while retaining 38 I/Os
5 V-tolerant I/Os: Enhanced system noise immunity, simplified external level-shifting circuitry
Full Ecosystem Compatibility: Easy development with STM32CubeIDE/HAL/LL libraries for the STM32L451CCU6
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FAQ
1. What is STM32L451CCU6?
STM32L451CCU6 is an ultra-low-power 32-bit MCU from STMicroelectronics' STM32L4 series, built around an Arm® Cortex®-M4 core with FPU and DSP instructions in a UFQFPN-48 package (7 mm × 7 mm). Operating at 80 MHz, the STM32L451CCU6 packs 256 KB Flash and 128 KB SRAM along with CAN 2.0B, USB OTG, and SAI into an extremely compact footprint, offering a streamlined peripheral set with excellent power efficiency and cost-effectiveness—ideal for space- and cost-sensitive battery-powered devices.
2. What are the key specifications of STM32L451CCU6?
Core: Arm® Cortex®-M4, up to 80 MHz, 100 DMIPS with FPU and DSP
Memory: 256 KB Flash, 128 KB SRAM
Operating Voltage: 1.71 V to 3.6 V
Temperature Range: -40 °C to +85 °C (industrial grade)
I/O Count: up to 38
Package: UFQFPN-48 (7 mm × 7 mm)
3. What are the characteristics of the UFQFPN-48 package on the STM32L451CCU6, and is it easy to solder?
The UFQFPN-48 is an ultra-thin QFN package measuring only 7 mm × 7 mm with an exposed thermal pad underneath. All pins of the STM32L451CCU6 are located on the bottom side, requiring reflow soldering or a hot-air station for assembly—manual soldering with a conventional iron is not feasible. This package drastically saves PCB space but demands precise stencil design and controlled reflow profiles, making the STM32L451CCU6 well-suited for automated SMT production.
4. What applications is STM32L451CCU6 suitable for?
Thanks to its ultra-compact 48-pin package, 256 KB Flash, CAN 2.0B bus, and USB OTG, the STM32L451CCU6 is ideally suited for size- and power-constrained devices that do not require a segment display or a large number of I/Os, such as miniature industrial sensor nodes, wearables, portable medical terminals, small drone flight controllers, and compact IoT edge devices.
5. What development tools support STM32L451CCU6?
ST provides free STM32CubeMX for graphical configuration and STM32CubeIDE as an integrated development environment for the STM32L451CCU6, along with the STM32CubeL4 firmware library. Debugging and programming are handled by ST-Link debuggers. For rapid prototyping, compatible NUCLEO boards (such as NUCLEO-L452RE) or QFN adapter boards can be used for early-stage verification.
6. What is the power consumption of the STM32L451CCU6 across its low-power modes?
Temperature Range: -40 °C to +85 °C
Ultra-low-power modes of the STM32L451CCU6:
Shutdown mode: ~33 nA (5 wake-up pins)
Standby mode: ~125 nA (5 wake-up pins), ~430 nA with RTC
Stop 2 mode: ~1.2 µA, ~1.4 µA with RTC
Run mode: ~100 µA/MHz (LDO mode)
7. How does STM32L451CCU6 differ from STM32L451VET6?
Both share the same core and peripherals (80 MHz Cortex-M4, CAN 2.0B, USB OTG, SAI, etc.). The differences lie in package, I/O count, and Flash capacity: the STM32L451CCU6 uses a 48-pin UFQFPN with up to 38 I/Os and 256 KB Flash, while VET6 uses a 100-pin LQFP with up to 83 I/Os and 512 KB Flash. The STM32L451CCU6 is ideal for compact designs where PCB area and cost are priorities, while VET6 offers more I/O flexibility and larger program space.
8. What is the main difference between STM32L451CCU6 and STM32L452CCU6?
Both share the same UFQFPN-48 package and 80 MHz Cortex-M4 core. The L452CCU6 offers 160 KB SRAM (32 KB more than the L451) and integrates operational amplifiers; the STM32L451CCU6 provides 128 KB SRAM without op-amps. If your application does not need analog signal conditioning and 128 KB of RAM is sufficient, the STM32L451CCU6 delivers the same core communication interfaces at a lower cost.
9. What key peripheral interfaces does STM32L451CCU6 offer?
Communication: CAN 2.0B, I²C, SPI, UART/USART, USB OTG FS, SAI (I2S/PCM/PDM)
Analog: 12-bit 5 Msps ADC, 12-bit DAC, ultra-low-power comparators
Timers: 16-bit and 32-bit general-purpose timers, advanced motor-control timer
Others: Quad SPI interface, SDMMC interface
10. How can I fully leverage the communication capabilities of STM32L451CCU6 in a 48-pin package?
Despite the limited pin count, flexible pin multiplexing on the STM32L451CCU6 allows CAN, USB, SAI, and multiple UART/SPI/I2C interfaces to be used simultaneously without conflicts. The 256 KB Flash can accommodate moderate communication stacks and data processing code, while 128 KB SRAM provides sufficient buffers for an RTOS and multi-tasking communications. For miniaturized systems that require CAN bus, USB connectivity, and an audio interface, the STM32L451CCU6 provides an ideal single-chip solution.