STMicroelectronics STM32L433CCU6

Overview

STM32L433CCU6 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, LCD controller, and integrated SMPS support. It delivers 36 µA/MHz in SMPS-run mode, 280 nA Standby with RTC, and supports capacitive touch sensing for battery-powered portable instrumentation and smart sensors.

For engineers reviewing the STM32L433CCU6 datasheet, STM32L433CCU6 pinout, STM32L433CCU6 application, or STM32L433CCU6 equivalent, key selection criteria include its dual-voltage regulator operation (LDO/SMPS), 83 GPIOs (most 5 V-tolerant), hardware parity on 16 KB SRAM, and integrated LCD driver supporting 8×40 segments - critical for low-power HMI designs.

Technical Context

The STM32L433CCU6 implements an Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from flash at 80 MHz, paired with a Memory Protection Unit (MPU) and interconnect matrix for deterministic peripheral arbitration. Its power architecture integrates dual regulators (LDO and external SMPS interface) and five low-power modes - including Stop 2 (1.28 µA with RTC) and Shutdown (8 nA) - managed via FlexPowerControl.

Clocking combines dual PLLs (system/USB/audio), four oscillator sources (HSE/LSE/HSI/MSI), and clock recovery (CRS) for crystal-less USB FS. Analog subsystem includes a 12-bit 5 Msps ADC with hardware oversampling (up to 16-bit), two 12-bit DACs, one op-amp with PGA, and two ultra-low-power comparators - all with independent supply domains.

Key Specifications

Pinout & Package

STM32L433CCU6 is housed in a 48-pin UFQFPN (7 × 7 mm) package with exposed thermal pad, RoHS-compliant and ECOPACK2 certified. Pin functions are defined per STM32L433xx datasheet Section 4 (Pinouts and pin description), with dedicated VDD/VSS pairs, multiple power domains (VDDA/VSSA, VREF+, VBAT), and flexible alternate function mapping across 16 AFs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power MCU applications.

Compared with STM32L432KCU6, the STM32L433CCU6 adds LCD and TSC for HMI while retaining identical power efficiency; versus STM32L476RGY6, it trades flash/SRAM capacity for integrated SMPS support and lower active current in energy-constrained deployments.

Availability

STM32L433CCU6 is available at Aetrix Electronics and suitable for wearable health monitors, smart gas sensor nodes, PLC edge modules, and energy meters requiring stable component supply and long-term industrial lifecycle support.

Supply support for STM32L433CCU6 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, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and analog devices for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, extended battery life, and rich peripheral integration - especially where LCD, capacitive touch, or USB FS connectivity is essential.

FAQ

What is the maximum operating frequency and corresponding power supply configuration for STM32L433CCU6?

The STM32L433CCU6 achieves 80 MHz maximum CPU frequency with the ART Accelerator enabled and either internal LDO or external SMPS supplying VDD. In SMPS mode (VDD12 = 1.10 V), it consumes 36 µA/MHz; in LDO mode, it draws 84 µA/MHz. Both configurations support full peripheral operation and 100 DMIPS performance.

Does STM32L433CCU6 support hardware cryptographic acceleration?

No, the STM32L433CCU6 does not include dedicated cryptographic accelerators (e.g., AES, SHA, PKA). It provides a true random number generator (RNG) and CRC calculation unit for basic security functions, but encryption/decryption must be implemented in software or via external secure elements.

How many I/O pins are available in the UFQFPN48 package, and what is their voltage tolerance?

The STM32L433CCU6 in UFQFPN48 offers 42 general-purpose I/O pins. Of these, the majority (all except analog inputs and specific system pins like NRST/BOOT0) are 5 V-tolerant, allowing direct interfacing with 5 V logic peripherals without external level-shifting circuitry.

Can the integrated LCD controller drive a graphic display, or is it limited to segment-based displays?

The LCD controller is designed exclusively for static or multiplexed segment-based displays (up to 8×40 or 4×44 segments). It lacks frame buffer memory, graphics acceleration, or RGB/TFT interface support - making it unsuitable for pixel-addressable graphic displays. It is optimized for low-power alphanumeric or icon-based HMIs.