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STMicroelectronics STM32F091CBU6 — Microcontrollers & Processors (MCU / MPU / DSP)

STM32F091CBU6 MCU, 48 MHz Cortex-M0, 128 KB Flash, 48-UFQFPN

MPNSTM32F091CBU6
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STMicroelectronics STM32F091CBU6, STM32F0 series, 32-bit ARM Cortex-M0 MCU, 48 MHz, 128 KB Flash, 32 KB SRAM, 48-UFQFPN (7x7 mm), -40°C to 85°C.

$5.0400Ref. price · indicative, final on quote
STMicroelectronics STM32F091CBU6 datasheet (PDF)
Packaging48-UFQFN Exposed Pad
RoHSROHS3 Compliant
SeriesSTM32F0
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STM32F091CBU6 specifications
ParameterValue
SeriesSTM32F0
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))2V ~ 3.6V
Operating temperature-40°C ~ 85°C (TA)
Speed48MHz
PackageTray
RAM size32K x 8
Core size32-Bit Single-Core
PeripheralsDMA, I²S, POR, PWM, WDT
ConnectivityCANbus, I²C, IrDA, LINbus, SPI, UART/USART
Number of i (O)38
Core processorARM® Cortex®-M0
Case48-UFQFN Exposed Pad
Data convertersA/D 13x12b; D/A 2x12b
Program memory size128KB (128K x 8)

Product details

48 MHz Cortex-M0 with 128 KB Flash — what it handles

The STM32F091CBU6: It is part of the STM32F0 value-line family, designed for cost-sensitive control and sensor-fusion applications where the Cortex-M0 core delivers adequate throughput.

The base product number is STM32F091, which covers the full density and package variant family.

48-UFQFN exposed pad — layout considerations

Supply voltage range is 2.0 V to 3.6 V, so a single 3.3 V rail is fine.

Delta: STM32F091CBU6 vs STM32L151CBU6A

The L151 includes USB connectivity and a 16-channel 12-bit ADC, while the F091 has 13 ADC channels plus two DACs. The L151's supply voltage drops to 1.8 V, useful for battery-powered designs; the F091 stays at 2.0 V minimum.

Frequently asked questions

What is an equivalent or replacement for STM32F091CBU6 if unavailable?

The STM32L151CBU6A is a functional peer with a Cortex-M3 core at 32 MHz, similar Flash and SRAM, and a comparable 48-UFQFPN package. However, it is not a pin-compatible or software-compatible drop-in — the peripheral set and register map differ. For a true second source within the STM32F0 family, consider the STM32F091RCT6 (64-pin LQFP) if pin count allows, or the STM32F091CCU6 (48-UFQFPN, 256 KB Flash) for higher memory. Verify firmware porting effort before substituting.