Item specifics
Description
The STM32F103VCT6 is a high-density performance line Cortex-M3 MCU from STMicroelectronics in an LQFP-100 package (14×14×1.45 mm). It features a 72 MHz Cortex-M3 core at 1.25 DMIPS/MHz, 256 KB Flash, and 48 KB SRAM. This model is the high-density upgrade of the STM32F103VBT6, with increases in both Flash and SRAM, and introduces FSMC, SDIO, DAC, and other advanced peripherals. It belongs to the high-density product line (256~512 KB Flash). The MCU integrates FSMC (SRAM/PSRAM/NOR/NAND/Compact Flash), LCD parallel interface, CAN 2.0B, USB 2.0 FS, SDIO, 3×12-bit ADCs (16 channels, 1 µs, triple sample-and-hold), 2×12-bit DACs, 12-channel DMA, up to 11 timers (2 advanced-control with PWM/deadtime), and 13 communication interfaces (5×USART/3×SPI/2×I2C/2×I2S/USB/CAN/SDIO). 80 I/Os, all 5 V-tolerant. Supply 2.0–3.6 V, -40–85 °C. ECOPACK®2. Comparison with similar models: Compared to the STM32F103VBT6 (medium-density, 128 KB Flash/20 KB SRAM), Flash is upgraded to 256 KB, SRAM to 48 KB, and FSMC, LCD parallel interface, SDIO, 2×12-bit DACs, a third ADC, more timers (11 vs 7), and more communication interfaces (13 vs 9) are added. Compared to the STM32F103VET6 (512 KB Flash), it has half the Flash capacity while all other peripherals remain identical.
Core: Arm Cortex-M3 72 MHz, 1.25 DMIPS/MHz, single-cycle multiplication/hardware division, SWD & JTAG debug, 43 maskable interrupt channels Memory: 256 KB Flash, 48 KB SRAM, CRC, 96-bit unique ID FSMC: External SRAM/PSRAM/NOR/NAND/Compact Flash, 4 chip selects; LCD 8080/6800 interface SDIO + CAN + USB: Storage card interface, industrial bus, full-speed USB 3×12-bit ADCs: 16 channels, 1 µs, triple sample-and-hold, temperature sensor 2×12-bit DACs: Buffered output Timers: 2× advanced-control (6-ch PWM/deadtime), 4× GP (quadrature encoder), 2× basic (DAC drive), 2× watchdogs, SysTick Communication Interfaces: 5×USART (ISO7816/LIN/IrDA), 3×SPI (18 Mbit/s), 2×I2C (SMBus), 2×I2S DMA: 12 channels I/Os: 80, all 5 V-tolerant Low Power: Sleep/Stop/Standby, VBAT backup RTC Package: LQFP-100 (14×14×1.45 mm)
Industrial: PLCs, inverters, CAN nodes, motor drive & control Dual-Motor FOC Control: 2 advanced-control timers Complex Systems: External SRAM/NAND expansion Medical & Handheld Devices IoT Gateways, Smart Home Automotive: Sensor nodes (non-safety-critical) Video Intercom, HVAC, Imaging & Vision
High-Density Product Line: 256 KB Flash + 48 KB SRAM, significant upgrade from medium-density VBT6 FSMC in 100 Pins: External memory and LCD support Dual Advanced Timers: Independent dual-motor FOC control Rich Analog: 3 ADCs with triple sampling + 2 DACs Peripheral Superset: SDIO, CAN, USB, 5 USARTs, 3 SPIs, 2 I2S 80 I/Os: LQFP-100 package, extremely rich I/O resources Mature STM32 Ecosystem: CubeIDE/CubeMX/HAL/LL
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FAQ:
What is the STM32F103VCT6 and where does it fit in the STM32F103 family?
The STM32F103VCT6 is a 72 MHz Arm Cortex‑M3 microcontroller with 256 KB Flash and 48 KB SRAM, housed in an LQFP‑100 package. It is the entry‑level, high‑pin‑count model of the STM32F103 series that still includes the FSMC external memory controller. This makes it a popular, cost‑optimized choice for designs that need a large number of I/O pins and the ability to expand with external parallel memory, while keeping the on‑chip Flash requirements modest.
How does the STM32F103VCT6 differ from the STM32F103VET6? When should I choose the VCT6?
Both share the same LQFP‑100 package, FSMC, and identical peripherals. The only difference is memory: the VCT6 provides 256 KB Flash and 48 KB SRAM, while the VET6 doubles the Flash to 512 KB and increases SRAM to 64 KB. Choose the VCT6 when your firmware fits comfortably within 256 KB and you want the most cost‑effective entry into the F103 line with FSMC and a 100‑pin package. The pin‑compatible VET6 offers a direct upgrade path if more code space is needed later without any PCB changes.
Is 256 KB Flash and 48 KB SRAM enough for a real‑time OS, communication stacks, and a motor control application?
Absolutely. A lightweight RTOS, a CANopen or Modbus protocol stack, and a complete motor‑control library can fit comfortably within 256 KB. The 48 KB SRAM is sufficient for communication buffers, task stacks, and real‑time control variables. Many proven industrial drives, building automation controllers, and data loggers ship with this exact configuration. If your firmware later grows, the pin‑compatible VET6 (512 KB Flash, 64 KB SRAM) provides a seamless upgrade.
What can I do with the FSMC on the STM32F103VCT6? What external memory is supported?
The FSMC (Flexible Static Memory Controller) allows you to connect external parallel NOR Flash, PSRAM, NAND Flash, and even memory‑mapped LCD displays. On the LQFP‑100 package, you can use a 16‑bit data bus to add up to 64 MB of external SRAM or PSRAM for data logging, frame buffers, or additional code storage. This makes the VCT6 a powerful choice for memory‑intensive applications that still want to stay within the simple, well‑known STM32F1 ecosystem. Note that the FSMC does not support SDRAM; that requires the STM32F4 series.
How does the STM32F103VCT6 compare to the STM32F107VCT6? Which one should I choose?
The STM32F107VCT6 is also an LQFP‑100 Cortex‑M3, but it adds an Ethernet MAC, a USB OTG controller, and a second CAN interface while keeping the same 256 KB Flash and 48 KB SRAM. The F107 sacrifices the FSMC, however. Choose the VCT6 when your design needs external parallel memory or an LCD interface via FSMC, but does not require Ethernet or USB OTG. If you must have native Ethernet or USB OTG, the F107 is the better fit, although you lose the FSMC.
Can the VCT6 run multiple UART, SPI, I2C, and CAN interfaces simultaneously on its 100‑pin package?
Yes, with up to 82 I/O pins, you can easily accommodate five USART/UART ports, three SPI interfaces, two I2C buses, one CAN 2.0B channel, a USB 2.0 full‑speed device, and still have pins left for the FSMC bus and general‑purpose I/O. STM32CubeMX helps you verify the exact pin‑multiplexing for your configuration. This makes the VCT6 an excellent single‑chip solution for communication‑centric embedded systems.
Is the STM32F103VCT6 still a good choice for new designs, or should I move to an STM32F2 or F4?
The VCT6 remains a very competitive choice for applications that do not require the higher clock speeds, FPU, or advanced peripherals of the F2/F4 series. Its 256 KB Flash, FSMC, and 100‑pin package offer excellent cost efficiency, and the mature F1 ecosystem—libraries, tools, and community support—reduces development time and risk. If your design needs Ethernet, a camera interface, or digital signal processing, consider migrating to the F2 or F4. For everything else, the VCT6 provides a reliable, well‑understood platform with long‑term availability.
What low‑power modes does the STM32F103VCT6 support, and what is the typical Stop‑mode current?
The chip supports Sleep, Stop, and Standby modes. In Stop mode with the main regulator off and all 48 KB SRAM retained, the typical current is around 14 µA. Wake‑up from Stop is fast enough to respond to external interrupts or communication events. While not as power‑efficient as the STM32L series, it can still be used in battery‑powered devices that spend most of their time in deep sleep and wake up periodically.
Can I perform over‑the‑air (OTA) firmware updates with the 256 KB single‑bank Flash?
Yes. You can partition the 256 KB Flash into a bootloader and an active application area. A typical split reserves 16 KB for the bootloader, leaving 240 KB for the application. The 48 KB SRAM can temporarily hold the new firmware image received via USB, UART, or an external wireless module. A CRC or signature check ensures a safe update without hardware dual‑bank Flash. An A/B scheme is possible if the application is kept compact.
What are the most typical applications for the STM32F103VCT6?
It is widely used in cost‑sensitive industrial motor drives, building automation controllers, multi‑channel data loggers, medical instruments, and consumer appliances. Any embedded system that needs a proven 32‑bit processor, a moderate amount of on‑chip Flash, the ability to expand with external parallel memory via FSMC, and a large number of I/O lines will benefit from the VCT6. Its balance of features and cost makes it a perennial favorite in the STM32 family.