STMicroelectronics STM32L433CCU3

Overview

STM32L433CCU3 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 human-interface applications.

For engineers reviewing the STM32L433CCU3 datasheet, STM32L433CCU3 pinout, STM32L433CCU3 application, or STM32L433CCU3 equivalent, key selection criteria include verified low-power mode current values (e.g., 28 nA Standby, 84 µA/MHz LDO-run), LCD 8×40 segment drive capability, USB crystal-less full-speed operation, and dual 12-bit DAC channels with sample-and-hold.

Technical Context

The STM32L433CCU3 integrates an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from flash at 80 MHz, alongside a memory protection unit (MPU) and interconnect matrix for deterministic peripheral arbitration. Its power architecture includes dual voltage regulation paths-integrated LDO and external SMPS interface-with hardware-controlled FlexPowerControl for dynamic mode transitions.

It features a dedicated LCD controller supporting 8×40 segments with integrated step-up converter, two ultra-low-power comparators, one operational amplifier with programmable gain amplifier (PGA), and a 12-bit ADC capable of 5 Msps with hardware oversampling up to 16-bit resolution-all supplied from independent analog domains.

Key Specifications

Pinout & Package

STM32L433CCU3 is housed in a 48-pin UFQFPN package (7 × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per STMicroelectronics DS11449 Rev 8, Section 4 (Pinouts and pin description), including dedicated LCD segment/common pins, USB D+/D−, VBAT, VREF+, and SMPS enable/control signals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L432KCU6, the STM32L433CCU3 adds LCD support and doubles flash capacity; versus STM32L476RGY6, it trades memory and USB OTG for smaller size and lower active current - making it optimal for space-constrained, display-equipped, long-life battery applications.

Availability

STM32L433CCU3 is available at Aetrix Electronics and suitable for smart utility meters, wearable health monitors, industrial sensor nodes, and portable medical diagnostic tools requiring stable component supply across extended product lifecycles.

Supply support for STM32L433CCU3 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, specializing in microcontrollers, power management, sensors, and automotive ICs with strong focus on energy efficiency and industrial reliability.

The STM32L4 series is designed for ultra-low-power embedded applications demanding extended battery life, rich analog integration, and secure firmware execution - targeting metering, wearables, and industrial IoT endpoints.

FAQ

What is the maximum operating frequency and corresponding DMIPS rating?

The STM32L433CCU3 operates at up to 80 MHz with an Arm Cortex-M4 core featuring FPU and ART Accelerator™, delivering 100 DMIPS (1.25 DMIPS/MHz). This performance level is sustained across its full voltage range (1.71–3.6 V) and temperature range (–40 °C to +105 °C), verified per DS11449 Rev 8 Section 3.1.

Does STM32L433CCU3 support crystal-less USB Full-Speed operation?

Yes, STM32L433CCU3 integrates a crystal-less USB 2.0 Full-Speed transceiver with built-in clock recovery system (CRS), eliminating the need for an external 48 MHz crystal. It achieves ±0.25% accuracy using the internal 48 MHz RC oscillator auto-trimmed by the 32.768 kHz LSE, as specified in Section 3.33 and Table 6.3.34 of DS11449 Rev 8.

What LCD configurations does the integrated controller support?

The STM32L433CCU3 LCD controller supports up to 8 commons and 40 segments (8×40) or 4 commons and 44 segments (4×44), with integrated step-up converter generating VLCD up to 5.2 V. It operates in static, 2/3/4-mux modes and includes blinking, contrast, and charge pump control registers - fully detailed in Section 3.21 and Table 6.3.25 of DS11449 Rev 8.

How many low-power modes are supported, and what are their typical current draws?

STM32L433CCU3 supports six low-power modes: Shutdown (8 nA), Standby (28 nA), Standby + RTC (280 nA), Stop 2 (1.0 µA), Stop 2 + RTC (1.28 µA), and Low-power Run (36 µA/MHz with SMPS). All values are measured at 3.3 V and 25 °C per Table 6.3.5 in DS11449 Rev 8, with wakeup latency as low as 4 µs from Stop mode.