STM32F205RCT6 - 120MHz Cortex-M3 MCU 256KB Flash | ST
MPN: STM32F205RCT6 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.42 | $6.42 |
| 10 | $5.78 | $57.80 |
| 100 | $5.15 | $515.00 |
| 500 | $4.62 | $2,310.00 |
| 1,000 | $4.15 | $4,150.00 |
STM32F205RCT6 Overview
A microcontroller (MCU) is a single integrated circuit that combines a processor core, memory, and peripherals such as timers, communication interfaces, and analog-to-digital converters into one chip. Within the semiconductor hierarchy, the STM32F205RCT6 belongs to the STM32F2 series, which sits in STMicroelectronics' high-performance STM32 family of ARM-based MCUs, positioned above mainstream entry-level lines and below the highest-performance Cortex-M7 devices.
Key features include the ARM Cortex-M3 core with the ART Accelerator (Adaptive Real-Time memory accelerator), which achieves 0-wait-state execution from Flash at 120 MHz and delivers 150 DMIPS (1.25 DMIPS/MHz per Dhrystone 2.1). The 256 KB Flash and 64 KB SRAM suit mid-size firmware images with protocol stacks. The device operates from a 1.8 V to 3.6 V supply (2.5 V/3.3 V typical rails) and integrates multiple USARTs, SPI, I2C, CAN, SDIO, USB OTG FS and HS interfaces, plus high-resolution timers and a 12-bit ADC for mixed-signal designs.
Technically, the STM32F205RCT6 leverages a 90 nm process with an adaptive real-time memory accelerator that removes Flash wait-state penalties, so interrupt latency and deterministic execution are preserved even at full clock speed. A memory protection unit (MPU), nested vectored interrupt controller (NVIC), and comprehensive clock tree with PLL multiply the flexibility for real-time embedded workloads.
Typical applications include industrial control and automation nodes, motor control and power inverters, medical and consumer devices, POS terminals, and communication gateways where the Connectivity Line peripherals (USB, CAN, SDIO) are used as bridges between interfaces.
One key design consideration: the LQFP-64 pin count limits total GPIO and peripheral multiplexing, so verify pin allocation early; also budget decoupling capacitors per VDD pin and place the VCAP capacitor correctly for the internal 1.2 V regulator.
This page synthesizes distributor pricing, same-family drop-in alternatives, pinout, and practical design notes not found in the manufacturer datasheet, with pricing as of 2026-09-06.
Drop-in alternatives for STM32F205RCT6 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with STM32F205RCT6 (same form factor and footprint) β differing in Flash Memory, Package, SRAM.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
STM32F205RET6
β Drop-Inπ Reference alternative (not in catalog)
STM32F205RBT6
β Drop-Inπ Reference alternative (not in catalog)
STM32F207RCT6
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
STM32F215RCT6
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
STM32F105RCT6
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
STM32F205RCT6 Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M3 (32-bit) |
| Core Size | 32-bit |
| Maximum Clock Frequency | 120 MHz |
| Performance | 150 DMIPS (1.25 DMIPS/MHz) |
| Flash Memory | 256 KB (256K x 8) |
| SRAM | 64 KB |
| Supply Voltage Range | 1.8 V to 3.6 V |
| Typical Supply Rails | 2.5 V / 3.3 V |
| Accelerator | ART Accelerator (0-wait-state Flash execution) |
| Memory Protection | MPU |
| Package | 64-LQFP (10 x 10 mm) |
| Mounting Type | Surface Mount |
| Packaging | Tray |
| Series | STM32F2 |
STM32F205RCT6 Pin Configuration
| Pin 1 | VBAT β Battery backup supply for RTC and backup registers |
| Pin 2 | PC13 β GPIO port C, TAMPER-RTC function |
| Pin 3 | PC14 β GPIO / OSC32_IN (32.768 kHz crystal input) |
| Pin 4 | PC15 β GPIO / OSC32_OUT (32.768 kHz crystal output) |
| Pin 5 | PH0 / OSC_IN β Main crystal input / GPIO H0 |
| Pin 6 | PH1 / OSC_OUT β Main crystal output / GPIO H1 |
| Pin 7 | NRST β System reset (active low) |
| Pin 8 | PC0 β GPIO port C |
| Pin 9 | PC1 β GPIO port C |
| Pin 10 | PC2 β GPIO port C |
| Pin 11 | PC3 β GPIO port C |
| Pin 12 | VDDA β Analog power supply |
| Pin 13 | VREF+ β ADC reference voltage positive |
| Pin 14 | VSSA β Analog ground |
| Pin 15 | PA0 β GPIO / WKUP (wake-up) |
| Pin 16 | PA1 β GPIO port A |
| Pin 17 | PA2 β GPIO / USART2_TX |
| Pin 18 | PA3 β GPIO / USART2_RX |
| Pin 19 | VSS β Digital ground |
| Pin 20 | VDD β Digital power supply |
| Pin 21 | PA4 β GPIO / SPI1_NSS / DAC_OUT1 |
| Pin 22 | PA5 β GPIO / SPI1_SCK / DAC_OUT2 |
| Pin 23 | PA6 β GPIO / SPI1_MISO |
| Pin 24 | PA7 β GPIO / SPI1_MOSI |
| Pin 25 | PC4 β GPIO port C |
| Pin 26 | PC5 β GPIO port C |
| Pin 27 | PB0 β GPIO port B / ADC input |
| Pin 28 | PB1 β GPIO port B / ADC input |
| Pin 29 | PB2 β GPIO / BOOT1 |
| Pin 30 | PB10 β GPIO / I2C2_SCL / USART3_TX |
| Pin 31 | PB11 β GPIO / I2C2_SDA / USART3_RX |
| Pin 32 | VCAP_1 β Internal 1.2 V core regulator capacitor (do not omit) |
| Pin 33 | VDD β Digital power supply |
| Pin 34 | PB12 β GPIO / SPI2_NSS |
| Pin 35 | PB13 β GPIO / SPI2_SCK |
| Pin 36 | PB14 β GPIO / SPI2_MISO |
| Pin 37 | PB15 β GPIO / SPI2_MOSI |
| Pin 38 | PC6 β GPIO port C |
| Pin 39 | PC7 β GPIO port C |
| Pin 40 | PC8 β GPIO / SDIO_D0 |
| Pin 41 | PC9 β GPIO / SDIO_D1 |
| Pin 42 | PA8 β GPIO / USART1_CK / MCO1 |
| Pin 43 | PA9 β GPIO / USART1_TX |
| Pin 44 | PA10 β GPIO / USART1_RX |
| Pin 45 | PA11 β GPIO / USB_DM / CAN1_RX |
| Pin 46 | PA12 β GPIO / USB_DP / CAN1_TX |
| Pin 47 | PA13 β GPIO / SWDIO (serial wire debug data) |
| Pin 48 | VCAP_2 β Internal 1.2 V core regulator capacitor |
| Pin 49 | VDD β Digital power supply |
| Pin 50 | PA14 β GPIO / SWCLK (serial wire debug clock) |
| Pin 51 | PA15 β GPIO / SPI1_NSS (JTDI) |
| Pin 52 | PC10 β GPIO / SDIO_D2 / USART3_TX |
| Pin 53 | PC11 β GPIO / SDIO_D3 / USART3_RX |
| Pin 54 | PC12 β GPIO / SDIO_CK / USART3_CK |
| Pin 55 | PD2 β GPIO / SDIO_CMD / TIM3_ETR |
| Pin 56 | PB3 β GPIO / SPI1_SCK (JTDO) |
| Pin 57 | PB4 β GPIO / SPI1_MISO (NJTRST) |
| Pin 58 | PB5 β GPIO / SPI1_MOSI |
| Pin 59 | PB6 β GPIO / I2C1_SCL / USART1_TX |
| Pin 60 | PB7 β GPIO / I2C1_SDA / USART1_RX |
| Pin 61 | BOOT0 β Boot mode selection (strap via resistor) |
| Pin 62 | PB8 β GPIO / I2C1_SCL / CAN1_RX |
| Pin 63 | PB9 β GPIO / I2C1_SDA / CAN1_TX |
| Pin 64 | VSS β Digital ground |
Typical Applications
STM32F205RCT6 is suitable for 6 applications: Industrial Control and Automation Nodes, Motor Control and Power Inverters, USB and Communication Gateways, Medical and Diagnostic Portable Devices, Point-of-Sale and Consumer Terminals, Test and Measurement Instrumentation.
Industrial Control and Automation Nodes
The STM32F205RCT6 fits industrial control nodes because its 120 MHz Cortex-M3 with ART Accelerator provides deterministic 0-wait-state Flash execution for time-critical control loops, while 256 KB Flash and 64 KB SRAM accommodate a real-time OS plus protocol stacks. Multiple USART, SPI, I2C, and CAN interfaces connect PLC I/O modules, sensors, and fieldbus gateways without external bridge chips. The 1.8 V to 3.6 V supply range tolerates industrial rail tolerances via a 3.3 V LDO or buck regulator. Design consideration: use the MPU to partition safety-critical code from communications tasks, and place the VCAP capacitor per datasheet requirements for stable core-voltage regulation in electrically noisy cabinets.
Recommended
Motor Control and Power Inverters
For motor drives, the STM32F205RCT6 combines a 120 MHz core, advanced PWM timers with complementary outputs and dead-time insertion, and a 12-bit ADC for phase-current sampling - enough throughput for field-oriented control of BLDC/PMSM motors at kHz control-loop rates. The 150 DMIPS performance headroom allows sensorless observers (sliding-mode or MRAS) to run alongside the control loop. USB and CAN links integrate the drive into higher-level automation systems. Attention must be paid to ADC injection-channel synchronization with PWM events for accurate current sampling, and to isolating the analog front end from switching noise using VSSA/VDDA filtering per the datasheet layout guidance.
Recommended
USB and Communication Gateways
The STM32F205RCT6 integrates USB OTG FS and HS, multiple CAN, SDIO, and up to several USARTs, making it a natural protocol-bridge MCU: USB-to-CAN adapters, Modbus-to-Ethernet preprocessing, and data-logger front ends. The 120 MHz core sustains line-rate packet forwarding between two or three concurrent interfaces, and 64 KB SRAM buffers bursts without external memory. The device enumerates as CDC/ HID/ mass-storage classes using the ST USB device library. Design tip: budget the LQFP-64 pin map early - USB D+/D-, CAN TX/RX, and SDIO consume fixed pins, and confirm 48 MHz USB clock accuracy from the PLL configuration.
Recommended
Medical and Diagnostic Portable Devices
Portable medical instruments benefit from the STM32F205RCT6's balance of compute and power: the 120 MHz core executes digital filtering and UI logic while peripheral clock gating and low-power modes extend battery life between charges. The 12-bit ADC digitizes sensor front ends (pressure, biosignal conditioning), and USB OTG supports data offload to hosts. 256 KB Flash stores calibration tables and application firmware with room for a bootloader enabling field updates - important for regulated devices. Compliance note: the MCU itself is not a medical-certified component; system-level IEC 60601 design, isolation, and EMI measures are the designer's responsibility around it.
Recommended
Point-of-Sale and Consumer Terminals
POS terminals and consumer appliances use the STM32F205RCT6 for its cost-effective 120 MHz performance, USB device connectivity for PC communication, and SDIO interface for receipt or log storage on SD cards. The 256 KB Flash holds payment application logic, secure-boot loaders, and font/GUI assets; 64 KB SRAM supports lightweight GUI frameworks. Wide 1.8 V to 3.6 V operation simplifies battery-backed designs. Note that payment applications require external secure elements for key storage - the F215RCT6 variant with hardware crypto can be considered where cryptographic acceleration is needed, on the identical LQFP-64 footprint.
Recommended
Test and Measurement Instrumentation
Bench instruments, data loggers, and sensor conditioners leverage the STM32F205RCT6's deterministic interrupt behavior (ART Accelerator, NVIC) for precise timing, its 12-bit ADC for measurement channels, and USB/CDC for PC connectivity. The 120 MHz clock enables oversampling and digital filtering of input signals, and hardware timers generate stimulus outputs with sub-microsecond resolution. Firmware complexity - menus, calibration routines, storage - fits comfortably in 256 KB Flash. Layout guidance: separate analog ground beneath the ADC input network from digital switching currents, use Kelvin routing to VSSA, and confirm ADC sampling clock derived from PLL jitter meets your accuracy budget.
Recommended
Recommended Products Summary
Engineering reference data for STM32F205RCT6 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM32F205RET6 | STM32F205RBT6 | STM32F207RCT6 | STM32F215RCT6 | STM32F105RCT6 |
|---|---|---|---|---|---|---|
| Package | LQFP-64 (10x10 mm) | LQFP-64 (10x10 mm) - same | LQFP-64 (10x10 mm) - same | LQFP-64 (10x10 mm) - same | LQFP-64 (10x10 mm) - same | LQFP-64 (10x10 mm) - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Core / Max Frequency | Cortex-M3 / 120 MHz | Cortex-M3 / 120 MHz | Cortex-M3 / 120 MHz | Cortex-M3 / 120 MHz | Cortex-M3 / 120 MHz | Cortex-M3 / 72 MHz |
| Flash Memory | 256 KB | 512 KB | 128 KB | 256 KB | 256 KB (RC variant) | 256 KB |
| SRAM | 64 KB | 64 KB | 16 KB | 64 KB (+4 KB backup) | 64 KB | 64 KB |
| Ethernet MAC | No | No | No | Yes (10/100) | No | No |
| Hardware Crypto | No | No | No | No | Yes (AES/DES/HASH) | No |
| Supply Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 2.0 V to 3.6 V |
| Performance | 150 DMIPS | 150 DMIPS | 150 DMIPS | 150 DMIPS | 150 DMIPS | 90 DMIPS |
Key Differentiators
- Best value in the same LQFP-64 footprint (vs STM32F205RET6)
- Full performance with adequate memory (vs STM32F205RBT6)
- Cost-optimized when no networking needed (vs STM32F207RCT6)
- 120 MHz ART-accelerated execution (vs STM32F105RCT6)
Design Notes
The STM32F205RCT6 integrates an internal 1.2 V core regulator whose output appears on VCAP_1 and VCAP_2 (pins 32 and 48). Fit the datasheet-specified ceramic capacitor on each VCAP pin - typically a 2.2 uF low-ESR type - placed as close to the pins as possible. Omitting or undersizing the VCAP capacitor is the single most common cause of the MCU failing to start or brown-out resetting under load transients. Decouple every VDD pin with 100 nF, and provide 4.7 uF bulk near the device.
Route VSSA/VDDA as a dedicated analog island: connect VREF+ (pin 13) to a clean, filtered 3.3 V (ferrite bead plus 1 uF and 10 nF) rather than sharing the noisy digital rail. Keep the ADC input traces short and away from USB and clock lines. Pin 1 of the LQFP-64 is at the top-left dot; verify silkscreen orientation because an incorrectly rotated 0.5 mm-pitch QFP is difficult to rework. Expose adequate thermal relief on all VSS pins to the ground pour for low-inductance return paths.
Three recurring pitfalls: (1) BOOT0 (pin 61) must not float - strap it to ground through a 10 kOhm resistor so the device boots from Flash; a floating BOOT0 causes intermittent boot-from-system-memory behavior. (2) PA13/PA14 are SWDIO/SWCLK - do not repurpose them as GPIO without keeping a debug header, or in-circuit programming becomes impossible. (3) The 120 MHz clock requires correct PLL configuration from the external 8-25 MHz crystal (HSE); verify crystal load capacitors against the crystal datasheet, not generic 22 pF assumptions.
Estimated: at 120 MHz with all peripherals active, the STM32F205RCT6 typically dissipates well under 0.5 W, and with an LQFP-64 theta_JA of roughly 50 C/W (approximate value - confirm in the datasheet thermal table) the junction rise above ambient stays below ~25 C. No heatsink or copper-plane thermal design is normally required; simply avoid enclosing the MCU next to a hot power stage above 85 C ambient, in which case the RCT7 (-40 to +105 C) grade variant should be used instead.
Compliance Information
The T6 suffix indicates an RoHS-compliant, lead-free terminations package per ST part-numbering convention; detailed REACH and halogen status should be confirmed on the ST product page compliance documentation.
