STM32F205RET6 - ARM Cortex-M3 MCU 120MHz 512KB | STMicroelectronics
MPN: STM32F205RET6 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.5 | $11.50 |
| 10 | $10.35 | $103.50 |
| 100 | $9.18 | $918.00 |
| 500 | $8.5 | $4,250.00 |
| 1,000 | $7.95 | $7,950.00 |
STM32F205RET6 Overview
An ARM Cortex-M3 microcontroller is a 32-bit RISC core (Cortex-M3 -> ARM Cortex-M family -> ARM 32-bit MCU -> embedded microcontroller -> semiconductor) optimized for deterministic real-time interrupt response and low power, complementing Cortex-M0/M0+ (cost) and Cortex-M4/M7 (DSP/FP) in the broader Cortex-M product tree. The STM32F2 family sits between Cortex-M3 and Cortex-M4 from a peripheral/integration standpoint; engineers choose the M3 variant (this part) when DSP extensions are unnecessary and the M4 when signal-processing throughput dominates.
Key distinguishing features include 1 Mbyte maximum Flash addressability with 512 KB populated, 132 KB SRAM (including 4 KB backup SRAM), a parallel 16-bit 8080/6800 FSMC/NAND/PSRAM controller, an on-chip 8 MHz and 40 kHz RC oscillator with PLL, plus three 12-bit 2 MSPS ADCs capable of multiplexing 24 channels. Hardware cryptographic accelerators and a true random number generator (TRNG) are absent on the -F205 sub-line; the -F215 variant adds crypto/hash acceleration. Power domains include a 1.8 V internal LDO core regulator with a stop-mode current of roughly 25 µA typ.
Typical applications are USB-to-Ethernet industrial gateways, CAN-connected motor and lighting controllers, point-of-sale terminals, biometric access modules, and human-machine interface (HMI) panels. The 10x10 mm LQFP-64 with 0.5 mm pitch balances I/O density with hand-repair-friendly leadouts for prototypes, while parts with the same outline at lower price (LQFP-48 from STM32F103) are available when fewer GPIO are required.
When designing with this MCU, budget approximately 60 µA/MHz active current at 120 MHz and 25 µA stop current at 3.3 V VDD, and verify your VSMD/VREF+ decoupling network follows the datasheet reference layout. Pinout consistency across the STM32F205 sub-line (Z/R/V/T/C/U/BGA) means same-family parts with larger memory may be placed on this footprint with no PCB rework; however the LQFP-64 vs LQFP-48 vs LQFP-100 outlines are not interchangeable.
Drop-in alternatives for STM32F205RET6 — 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 STM32F205RET6 (same form factor and footprint) — differing in Package, Timers, SRAM, ADC, Communication Interfaces.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
STM32F205RCT6
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.15 / Unit
View Datasheet →STM32F205RGT6
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$8.1 / Unit
View Datasheet →STM32F215RET6
✅ Drop-In📋 Reference alternative (not in catalog)
STM32F207RET6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
GD32F303RET6
✅ Drop-In📋 Reference alternative (not in catalog)
GD32F305RET6
✅ Drop-In📋 Reference alternative (not in catalog)
STM32F105RCT6
✅ Drop-In✓ In Stock
$4.85 / Unit
View Datasheet →STM32F205RET6 Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M3 32-bit RISC |
| Maximum Clock Frequency | 120 MHz |
| CoreMark / DMIPS Performance | 150 DMIPS / 1.25 DMIPS/MHz |
| ART Accelerator | Yes (0-wait-state Flash execution) |
| Program (Flash) Memory | 512 KB |
| SRAM | 132 KB (128 KB + 4 KB backup) |
| GPIOs | 51 |
| Package | 64-LQFP (10x10 mm, 0.5 mm pitch) |
| ADCs | 3 x 12-bit, up to 24 channels |
| DACs | 2 x 12-bit |
| Timers | 17 (incl. advanced-control 16-bit, basic, watchdog, SysTick, RTC) |
| Communication Interfaces | USB OTG HS + USB OTG FS, 10/100 Ethernet MAC, 2x CAN 2.0B, 6x USART/UART, 3x SPI, 2x I2C, SDIO |
| External Memory Controller | FSMC (NOR/PSRAM/NAND 16-bit, 8080/6800) |
| Operating Voltage | 1.8 V - 3.6 V |
| Operating Temperature | -40 C to +85 C |
| Mounting Type | Surface Mount (Tray) |
| RoHS Status | Compliant |
| MPU | Yes |
STM32F205RET6 Pin Configuration
| Pin 1 | VBAT — RTC backup battery power input |
| Pin 2 | PC13 — GPIO/Tamper-RTC |
| Pin 3 | PC14/OSC32_IN — GPIO/32 kHz crystal input |
| Pin 4 | PC15/OSC32_OUT — GPIO/32 kHz crystal output |
| Pin 5 | OSC_IN — HSE crystal input |
| Pin 6 | OSC_OUT — HSE crystal output |
| Pin 7 | NRST — Reset (active low) |
| Pin 8 | VSSA — Analog ground |
| Pin 9 | VDDA — Analog supply (2.4 V to 3.6 V) |
| Pin 10 | PA0/WKUP — GPIO/ADC0/Wake-up |
| Pin 11 | PA1 — GPIO/ADC1 |
| Pin 12 | PA2 — GPIO/USART2_TX |
| Pin 13 | PA3 — GPIO/USART2_RX |
| Pin 14 | PA4 — GPIO/SPI1_NSS/DAC1_OUT |
| Pin 15 | PA5 — GPIO/SPI1_SCK/DAC2_OUT |
| Pin 16 | PA6 — GPIO/SPI1_MISO/ADC6 |
| Pin 17 | PA7 — GPIO/SPI1_MOSI/ADC7 |
| Pin 18 | PB0 — GPIO/ADC8 |
| Pin 19 | PB1 — GPIO/ADC9 |
| Pin 20 | PB2/BOOT1 — GPIO/Boot mode select |
| Pin 21 | PB10 — GPIO/I2C2_SCL/USART3_TX |
| Pin 22 | PB11 — GPIO/I2C2_SDA/USART3_RX |
| Pin 23 | VSS_1 — Digital ground |
| Pin 24 | VDD_1 — Digital supply (2.0 V to 3.6 V) |
| Pin 25 | PB12 — GPIO/SPI2_NSS/CAN2_RX |
| Pin 26 | PB13 — GPIO/SPI2_SCK/CAN2_TX |
| Pin 27 | PB14 — GPIO/SPI2_MISO/USART3_RTS |
| Pin 28 | PB15 — GPIO/SPI2_MOSI |
| Pin 29 | PA8 — GPIO/USART1_CK/OTG_FS_SOF |
| Pin 30 | PA9 — GPIO/USART1_TX/OTG_FS_VBUS |
| Pin 31 | PA10 — GPIO/USART1_RX/OTG_FS_ID |
| Pin 32 | PA11 — GPIO/OTG_FS_DM |
| Pin 33 | PA12 — GPIO/OTG_FS_DP |
| Pin 34 | PA13 — GPIO/JTMS-SWDIO |
| Pin 35 | VSS_2 — Digital ground |
| Pin 36 | VDD_2 — Digital supply |
| Pin 37 | PA14 — GPIO/JTCK-SWCLK |
| Pin 38 | PA15 — GPIO/JTDI/TIM2_CH1_ETR |
| Pin 39 | PB3 — GPIO/JTDO/TIM2_CH2 |
| Pin 40 | PB4 — GPIO/NJTRST/TIM3_CH1 |
| Pin 41 | PB5 — GPIO/I2C1_SMBAI/TIM3_CH2 |
| Pin 42 | PB6 — GPIO/I2C1_SCL/USART1_TX |
| Pin 43 | PB7 — GPIO/I2C1_SDA/USART1_RX |
| Pin 44 | BOOT0 — Boot mode select |
| Pin 45 | PB8 — GPIO/I2C1_SCL/CAN1_RX |
| Pin 46 | PB9 — GPIO/I2C1_SDA/CAN1_TX |
| Pin 47 | VSS_3 — Digital ground |
| Pin 48 | VDD_3 — Digital supply |
| Pin 49 | PE0 — GPIO/TIM4_ETR/FSMC_NBL0 |
| Pin 50 | PE1 — GPIO/FSMC_NBL1 |
| Pin 51 | PD0 — GPIO/FSMC_D2 |
| Pin 52 | PD1 — GPIO/FSMC_D3 |
| Pin 53 | VSS_4 — Digital ground |
| Pin 54 | VDD_4 — Digital supply |
| Pin 55 | PD2 — GPIO/SDIO_CMD/TIM3_ETR |
| Pin 56 | PD3 — GPIO/FSMC_CLK |
| Pin 57 | PD4 — GPIO/FSMC_NOE |
| Pin 58 | PD5 — GPIO/FSMC_NWE |
| Pin 59 | PD6 — GPIO/FSMC_NWAIT |
| Pin 60 | PD7 — GPIO/FSMC_NE1 |
| Pin 61 | PC6 — GPIO/I2S2_MCK/SDIO_D6 |
| Pin 62 | PC7 — GPIO/I2S3_MCK/SDIO_D7 |
| Pin 63 | PC8 — GPIO/SDIO_D0 |
| Pin 64 | PC9 — GPIO/SDIO_D1 |
Typical Applications
STM32F205RET6 is suitable for 7 applications: Industrial USB-to-Ethernet Gateway, CAN-Based Motor / Lighting Controller, Point-of-Sale (POS) Terminal, Biometric Access-Control Module, HMI Panel / Operator Interface, USB Audio Class 2.0 DAC/Headphone Amplifier, IoT Sensor Hub / Edge Node.
Industrial USB-to-Ethernet Gateway
Acts as the bridge IC between a host computer's USB 2.0 high-speed link and a 10/100 Ethernet LAN in industrial protocol converters (Modbus TCP, BACnet/IP, EtherNet/IP). The STM32F205RET6's on-chip USB OTG high-speed PHY plus dedicated Ethernet MAC deliver bidirectional throughput without an external PHY bridge, while the 512 KB Flash hosts full lwIP/TLS stacks and web UIs. The 132 KB SRAM sustains packet buffers for line-rate TCP; ART Accelerator keeps interrupt servicing deterministic at 120 MHz even when both busses peak. Designers typically pair the part with an SMSC LAN8720 or Microchip KSZ8041 PHY using the integrated RMII interface.
Recommended
CAN-Based Motor / Lighting Controller
Drives BLDC or stepper motor control plus DMX-controlled LED fixtures through the two CAN 2.0B controllers on the STM32F205RET6. The three 12-bit 2 MSPS ADCs sample phase currents at 20 kHz PWM rates while the 17-timer block generates center-aligned complementary PWMs with dead-time insertion. The 10x10 mm LQFP-64 keeps per-node PCB cost low in daisy-chained industrial lighting strips with thousands of nodes. 120 MHz headroom lets the same firmware run a Kalman-filter observer without taxing the CPU, and -40 C to +85 C operation supports outdoor cabinet mounting without derating.
Recommended
Point-of-Sale (POS) Terminal
Acts as the secure host processor in countertop POS terminals, combining USB OTG high-speed for printer/scanner peripherals with SDIO for SD-card transaction logging and USART for mag-stripe/PIN-pad readers. The 512 KB Flash stores the EMV kernel plus full TCP/IP stack for IP-based payment terminals, while 132 KB SRAM serves as transaction buffers. Hardware crypto is NOT included on the -F205 sub-line, so secure PIN handling relies on an external secure element communicating over SPI or I2C. The LQFP-64 package survives hand-solder repair cycles during field service.
Recommended
Biometric Access-Control Module
Functions as the main controller in fingerprint, RFID, or facial-recognition door readers, reading capacitive sensors or cameras over DCMI/USART and driving a 320x240 TFT LCD through the FSMC bus. The STM32F205RET6's 132 KB SRAM holds 256x256 grayscale fingerprint templates while 512 KB Flash hosts the full NIST biometric SDK plus TLS client. USB OTG full-speed enumerates as a CDC-ACM for configuration, and RTC with backup registers handles secure timekeeping. Pinout compatibility with the -F215 sub-line lets OEMs field-upgrade to a crypto-enabled variant with no PCB rework.
Recommended
HMI Panel / Operator Interface
Drives 4.3-inch QVGA TFT touch panels in industrial HMI terminals using the FSMC 16-bit parallel interface for fast frame updates, while a USB OTG host port connects to USB flash drives for log export. The three ADCs read panel supply voltage, ambient light (for backlight dimming), and touch-pressure sensing. The 120 MHz core plus ART accelerator keeps capacitive-touch GUI fluid at 60 fps even under Modbus polling load. Pinout is identical across LQFP-64 STM32F205R variants so a single PCB layout supports entry-level to crypto-enabled SKUs.
Recommended
USB Audio Class 2.0 DAC/Headphone Amplifier
Receives 24-bit/96 kHz USB Audio Class 2.0 streams over the high-speed USB OTG peripheral and drives a stereo DAC/I2S DAC plus headphone amplifier through the I2S peripheral, producing bit-perfect PC audio. The 132 KB SRAM doubles as a jitter-reducing audio buffer, while the 120 MHz Cortex-M3 plus DMA2 stream keeps USB/audio streams jitter-free. Although the -F205 sub-line lacks hardware AES, encrypted USB driver paths rely on software crypto at negligible performance cost. The pin-compatible -F215 variants are commonly deployed in audiophile DACs that require secured firmware upgrades.
Recommended
IoT Sensor Hub / Edge Node
Aggregates I2C/SPI/UART sensors (temperature, humidity, accelerometers, 6LoWPAN radios) and forwards telemetry over Wi-Fi or NB-IoT modules through the USART and USB interfaces. The 17-timer array wakes the MCU on sensor events, returning it to stop mode at 25 µA typ for battery-powered logistics tracking tags. The Cortex-M3 at 120 MHz plus ART accelerator runs JSON serialization and CoAP lightweight stacks without external memory. Pin-compatible STM32F103 LQFP-64 parts serve as cost-down alternates when Ethernet is unused.
Recommended
Recommended Products Summary
Engineering reference data for STM32F205RET6 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM32F215RET6 | STM32F207RET6 | STM32F105RCT6 | GD32F303RET6 | GD32F305RET6 |
|---|---|---|---|---|---|---|
| Package | 64-LQFP (10x10) | 64-LQFP (10x10) - same | 64-LQFP (10x10) - same | 64-LQFP (10x10) - same | 64-LQFP (10x10) - same | 64-LQFP (10x10) - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | GigaDevice | GigaDevice |
| Core | ARM Cortex-M3 120 MHz | ARM Cortex-M3 120 MHz | ARM Cortex-M3 120 MHz | ARM Cortex-M3 72 MHz | ARM Cortex-M4F 120 MHz | ARM Cortex-M4F 120 MHz |
| Flash | 512 KB | 512 KB | 1 MB | 256 KB | 512 KB | 512 KB |
| SRAM | 132 KB | 132 KB | 132 KB | 64 KB | 96 KB | 96 KB |
| Ethernet MAC | 10/100 | 10/100 | 10/100 | No | No | No |
| USB OTG HS | Yes | Yes | Yes | No (FS only) | No (FS only) | Yes |
| Hardware Crypto (AES/SHA) | No | Yes (AES-256/SHA/HMAC/TRNG) | Yes (AES-256/SHA/HMAC/TRNG) | No | No | No |
| FPU / DSP | No | No | No | No | Yes (M4F) | Yes (M4F) |
| Operating Voltage | 1.8 V - 3.6 V | 1.8 V - 3.6 V | 1.8 V - 3.6 V | 2.0 V - 3.6 V | 2.6 V - 3.6 V | 2.6 V - 3.6 V |
Key Differentiators
- Highest-in-class connectivity for the price (USB OTG HS + Ethernet MAC + 2x CAN) (vs STM32F103RET6)
- ART Accelerator delivers 0-wait-state Flash performance (vs STM32F105RCT6)
- Pin-compatible upgrade path to hardware AES-256/SHA/TRNG (vs GD32F303RET6)
- Versus Cortex-M4 alternates the F205 keeps Cortex-M3 register-compatibility with F1/F3 firmware (vs GD32F305RET6)
Design Notes
Power the STM32F205RET6 from a low-ripple 3.3 V LDO (TPS7A4533 / LT1764) with a 10 µF bulk + 100 nF + 10 nF decoupling network on each VDD/VDDA pin pair. The 1.8 V internal LDO regulator drives the core; VDD must remain between 2.0 V and 3.6 V when full-speed 120 MHz operation is required, and between 1.8 V and 3.6 V at lower speeds. Decoupling VREF+ with a 100 nF ceramic close to the pin keeps ADC SNR at full 12-bit 2 MSPS performance.
Place the 4-layer PCB stack-up with a continuous ground plane directly under the LQFP-64 body to drop thermal resistance to about 35 C/W. Keep the HSE crystal traces under 5 mm, guard them with a ground ring, and route VREF+/VDDA with separate power-trace geometry from VDD. The DP/DM 90-ohm differential pair to the USB connector must be length-matched within 2 mm to comply with high-speed USB signal-integrity masks.
Estimated: At 120 MHz over typical USB HS and Ethernet traffic the STM32F205RET6 draws roughly 60-90 mA from VDD; never share the DP/DM pull-up 1.5 kohm resistor between devices or pull-up D+ too early or the host mis-enumerates. The NRST pin requires an open-drain 100 ns pulse - using a push-button pull-up is fine but verify your watchdog window (IWDG) configuration or the first firmware boot will trigger a reset loop. Always strap BOOT0 low on production builds to enforce Flash boot, and add a 10 kohm-to-GND option resistor for In-System Programming.
When using the FSMC interface to drive a TFT or external PSRAM, route the 16-bit data bus with controlled-impedance traces (50-ohm single-ended to GND) and length-match address/control lines to within 5 mm to the data bus. The 8080/6800 mode uses specific pins on PD/PE banks; refer to the alternate-function mapping table (RM0033) before re-routing because the ETR/TIMER assignments differ from the F1 series. Keep the SDIO bus short, separated from USB HS, and add 33 ohm series resistors close to the SD-card connector.
Compliance Information
RoHS compliance and lead-free finish per ST product page; the STM32F205RET6 is industrial-grade (-40 C to +85 C), NOT AEC-Q100 qualified - for AEC-Q100/Otomotive use the STM32F205RGT7 sub-line is not available, so choose STM32F405/STM32F427 + extended-temp part numbers.
