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STMicroelectronics STM32L433CBU6 — Microcontrollers & Processors (MCU / MPU / DSP)

STM32L433CBU6 STM32L4 MCU, 32-bit ARM Cortex-M4, 80 MHz

MPNSTM32L433CBU6
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STMicroelectronics STM32L4 series STM32L433CBU6, 32-bit ARM Cortex-M4 MCU, 80 MHz, 128 KB Flash, 64 KB SRAM, 1.71 V to 3.6 V supply, 38 I/O, 48-UFQFPN (7x7), -40°C to 85°C.

$5.7600Ref. price · indicative, final on quote
STMicroelectronics STM32L433CBU6 datasheet (PDF)
Packaging48-UFQFN Exposed Pad
RoHSROHS3 Compliant
SeriesSTM32L4
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STM32L433CBU6 specifications
ParameterValue
SeriesSTM32L4
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.71V ~ 3.6V
Operating temperature-40°C ~ 85°C (TA)
Speed80MHz
PackageTray
RAM size64K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, DMA, LCD, PWM, WDT
ConnectivityCANbus, I2C, IrDA, LINbus, MMC/SD, QSPI, SAI, SPI, SWPMI, UART/USART, USB
Number of i (O)38
Core processorARM® Cortex®-M4
Case48-UFQFN Exposed Pad
Data convertersA/D 10x12b; D/A 2x12b
Program memory size128KB (128K x 8)

Product details

What the 80 MHz Cortex-M4 buys you on this 128 KB Flash part

The STM32L433CBU6: The 48-UFQFPN (7x7) package with an exposed pad keeps the footprint small — 7 mm square — while the pad helps pull heat out if the MCU is driving a display or handling USB traffic continuously.

Connectivity and peripherals — what's on the bus

This MCU brings CANbus, USB, QSPI, and SAI (serial audio interface) on-chip, plus the usual I2C, SPI, and UART/USART blocks. The QSPI interface lets you attach external Flash or PSRAM for code shadowing or data logging without chewing up GPIO for a parallel bus. The LCD controller is also integrated, so a segment LCD panel can be driven directly — common in gas-pump displays, thermostats, and medical meters.

No last-time-buy notice has been issued, and the part remains in ST's current production portfolio. The ROHS3 compliance is current, so it passes European and Asian environmental regulations without a waiver.

Frequently asked questions

What is the maximum operating frequency of STM32L433CBU6?

The core runs at 80 MHz. That is the maximum clock from the internal oscillator or an external crystal; the PLL can multiply it up from a lower source, but the system bus tops out at 80 MHz.