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STMicroelectronics STM32F091RCY6TR — Microcontrollers & Processors (MCU / MPU / DSP)

STM32F091RCY6TR STM32F0 MCU, 48MHz, 256KB Flash, 64-WLCSP

MPNSTM32F091RCY6TR
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STMicroelectronics STM32F0 series ARM Cortex-M0 32-bit MCU, STM32F091RCY6TR, 48MHz, 256KB Flash, 32KB RAM, 52 I/O, 64-WLCSP (3.35x3.59 mm), -40 to 85°C.

$6.6600Ref. price · indicative, final on quote
STMicroelectronics STM32F091RCY6TR datasheet (PDF)
Packaging64-UFBGA, WLCSP
RoHSROHS3 Compliant
SeriesSTM32F0
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STM32F091RCY6TR 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
PackageTape & Reel (TR); Cut Tape (CT)
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)52
Core processorARM® Cortex®-M0
Case64-UFBGA, WLCSP
Data convertersA/D 19x12b; D/A 2x12b
Program memory size256KB (256K x 8)

Product details

48 MHz Cortex-M0 with 256 KB flash — where the memory budget lands

The STM32F091RCY6TR runs an ARM Cortex-M0 core at 48 MHz, which for a firmware engineer means the execution ceiling is set by the flash wait-state profile at that clock rather than the core itself — at 48 MHz the zero-wait execution covers most control loops without stalling.

Industrial temperature grade and peripheral mix

The 19-channel 12-bit ADC covers multi-sensor front-ends like thermocouple arrays or current-sense amplifiers, while the dual 12-bit DAC drives analog actuator setpoints without an external converter.

Frequently asked questions

What is the closest pin-compatible alternative in the STM32F0 family?

The base product number STM32F091 covers multiple memory and package variants sharing the same 64-WLCSP footprint. The STM32F091VCT6 in LQFP-100 is not pin-compatible due to the different package. Within the 64-WLCSP package, the STM32F091RCT6 (256 KB flash, 32 KB RAM) is the same die in a different package variant — verify the ball map against your layout before substituting.

What compliance documentation does STMicroelectronics provide for STM32F091RCY6TR?

The part is ROHS3 compliant. Standard documentation includes the ROHS certificate of compliance, material declaration, and the product change notification (PCN) history.