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STMicroelectronics STM32F103RCY6CTR — Microcontrollers & Processors (MCU / MPU / DSP)

STM32F103RCY6CTR ARM Cortex-M3 MCU, 72 MHz, 256 KB Flash

MPNSTM32F103RCY6CTR
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STMicroelectronics STM32F1 series STM32F103RCY6CTR, 32-bit ARM Cortex-M3 MCU, 72 MHz, 256 KB Flash, 48 KB SRAM, 64-WLCSP (4.4x4.4 mm), -40°C to 85°C, 2V to 3.6V supply.

$3.7725Ref. price · indicative, final on quote
STMicroelectronics STM32F103RCY6CTR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STM32F103RCY6CTR specifications
ParameterValue
SeriesSTM32F1
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))2V ~ 3.6V
Operating temperature-40°C ~ 85°C (TA)
Speed72MHz
PackageTape & Reel (TR)
RAM size48K x 8
Core size32-Bit Single-Core
PeripheralsDMA, Motor Control PWM, PDR, POR, PVD, PWM, Temp Sensor, WDT
ConnectivityCANbus, I²C, IrDA, LINbus, SPI, UART/USART, USB
Number of i (O)51
Core processorARM® Cortex®-M3
Case64-UFBGA, WLCSP
Data convertersA/D 16x12b; D/A 2x12b
Program memory size256KB (256K x 8)

Product details

72 MHz ARM Cortex-M3 with 256 KB Flash in a 64-WLCSP

The 64-WLCSP package (4.4x4.4 mm) is the key differentiator here — it's the smallest footprint in the STM32F103RCY6CTR ordering code family, designed for space-constrained PCBs where every square millimeter counts.

This MCU integrates a rich set of peripherals: DMA, motor control PWM, programmable voltage detector (PVD), power-on reset (POR), brown-out reset (PDR), a temperature sensor, and a watchdog timer. The 51 general-purpose I/O pins give flexibility for parallel sensor arrays or display interfaces.

The supply voltage range of 2V to 3.6V allows operation from a single Li-ion cell or a 3.3V rail with margin for brown-out conditions. The internal oscillator reduces external component count, though the clock tree still needs careful configuration for USB timing.

Data converters and analog integration

The STM32F103RCY6CTR includes a 12-bit ADC with 16 multiplexed channels and two 12-bit DACs, enabling direct sensor readout and analog output without an external converter.

Frequently asked questions

What is the closest pin-compatible alternative to STM32F103RCY6CTR?

Within the STM32F103 series, the STM32F103RCT6 (LQFP-64 package) is a common alternative with the same 256 KB Flash and 48 KB SRAM, but in a larger LQFP footprint. For a WLCSP pin-compatible alternative, the STM32F103R8Y6 (64 KB Flash) shares the same package but has less program memory. Verify the specific memory and peripheral requirements before substituting.