STMicroelectronics STM32L433CCT3

Overview

STM32L433CCT3 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, 80 MHz max frequency, 256 KB flash, 64 KB SRAM, USB FS, LCD controller, and integrated SMPS support. It operates from 1.71–3.6 V across –40 °C to 105 °C and delivers 100 DMIPS for battery-powered portable medical devices requiring real-time signal processing and display.

For engineers reviewing the STM32L433CCT3 datasheet, STM32L433CCT3 pinout, STM32L433CCT3 application, or STM32L433CCT3 equivalent, key selection criteria include its 36 µA/MHz SMPS-enabled run mode, 280 nA standby-with-RTC current, 12-bit ADC at 5 Msps, and LQFP48 package compatibility with space-constrained wearable designs.

Technical Context

The device integrates an Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from flash at 80 MHz, paired with a memory protection unit (MPU) and dual-voltage domain architecture supporting external SMPS for optimized power efficiency. Its interconnect matrix decouples bus arbitration between CPU, DMA, and peripherals to sustain deterministic timing in mixed-workload applications.

Low-power operation is architecturally enforced via FlexPowerControl: five distinct low-power modes (Shutdown, Standby, Stop 2, etc.) are managed by dedicated power control logic, with hardware-accelerated batch acquisition mode (BAM) allowing peripheral data capture without CPU wake-up - critical for sensor hub duty cycling.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, ECOPACK2 certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L433RCT6 and STM32L476RGT6, the STM32L433CCT3 uniquely balances ultra-low-power operation, integrated LCD driving, and compact LQFP48 packaging - making it optimal for space- and battery-constrained portable instrumentation where display integration reduces BOM count and power conversion losses.

Availability

STM32L433CCT3 is available at Aetrix Electronics and suitable for portable medical monitors, smart utility meters, industrial handheld terminals, and wireless sensor nodes requiring stable component supply across extended product lifecycles.

Supply support for STM32L433CCT3 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 automotive semiconductors since 1987.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, with the L433 subgroup specifically optimized for battery-operated devices integrating display, analog sensing, and USB connectivity.

FAQ

What is the maximum operating temperature range for STM32L433CCT3?

The STM32L433CCT3 is rated for operation from –40 °C to +105 °C ambient temperature, validated per industrial-grade specifications. This range supports deployment in harsh environments such as industrial control panels and outdoor utility meters without derating. Thermal performance is confirmed in Section 6.3.1 of DS11449 Rev 8, with junction temperature limits defined under specified PCB copper area and airflow conditions.

Does STM32L433CCT3 support external SMPS, and how does it affect power consumption?

Yes - the device features dedicated VDD12 and VSS12 pins for connection to an external switched-mode power supply, reducing core voltage to ~1.05–1.10 V. In this configuration, active-mode current drops to 36 µA/MHz (vs. 84 µA/MHz in LDO mode), delivering >57% power savings at 80 MHz. The SMPS interface is fully managed by on-chip power control logic, requiring no software intervention beyond initialization.

Can the integrated LCD controller drive custom segment displays, and what voltage levels does it support?

Yes - the controller supports static, 2-, 3-, or 4-mux segment LCDs up to 8×40 or 4×44 configurations. It includes an integrated step-up converter generating VLCD up to 5.3 V from VDD, eliminating need for external boost circuitry. Segment and common outputs are directly compatible with standard glass LCD modules; contrast is adjustable via software-controlled bias voltage division.

Is USB functionality available without an external crystal, and what are the timing accuracy implications?

Yes - the STM32L433CCT3 implements crystal-less USB 2.0 Full-Speed using its internal 48 MHz clock recovery system (CRS) synchronized to the USB SOF packet. Timing accuracy meets USB specification (±0.25%) without external oscillator, verified across voltage (1.71–3.6 V) and temperature (–40 to 105 °C) ranges per Section 6.3.27 of the datasheet.