Item specifics
Description
The STM32F103VFT6 is an XL-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 with single-cycle multiplication and hardware division, 768 KB Flash, and 96 KB SRAM. This model belongs to the STM32F103xF product line (768 KB~1 MB Flash) and is one of the highest-memory variants in the STM32F103 family within a 100-pin package. 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 14 timers (including 2 advanced-control with PWM/deadtime/emergency stop), 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 STM32F103VET6 (512 KB Flash/64 KB SRAM), Flash is upgraded to 768 KB and SRAM to 96 KB. Compared to the STM32F103VCT6 (256 KB Flash/48 KB SRAM), memory capacity is significantly increased. Core specifications are identical to the STM32F103RFT6 (LQFP-64, 768 KB Flash/96 KB SRAM), with the package upgraded to LQFP-100 and I/Os increased from 51 to 80.
Core: Arm Cortex-M3 72 MHz, 1.25 DMIPS/MHz, single-cycle multiplication/hardware division, SWD & JTAG debug Memory: 768 KB Flash, 96 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 with direct TFT-LCD drive Medical & Handheld Devices IoT Gateways, Smart Home Automotive: Sensor nodes (non-safety-critical) Video Intercom, HVAC, Imaging & Vision
768 KB Flash + 96 KB SRAM: XL-density flagship configuration in the STM32F103 100-pin family for large firmware and complex algorithms FSMC + LCD Parallel Interface: External memory expansion and direct TFT-LCD drive without an external LCD controller Dual Advanced Timers: Independent dual-motor FOC control 3×12-bit ADCs (16-ch): Triple sample-and-hold for multi-sensor synchronous acquisition 2×12-bit DACs: Buffered output for audio/sensor excitation/control loops 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 STM32F103VFT6 and what makes its 768 KB Flash unique?
The STM32F103VFT6 is a 72 MHz Arm Cortex‑M3 microcontroller with an unusual 768 KB of Flash and 96 KB of SRAM, housed in an LQFP‑100 package. It sits between the 512 KB VET6 and the 1 MB VGT6, offering a sweet‑spot Flash density for applications that need more code space than the mainstream 512 KB but do not require the full 1 MB. It retains the same FSMC external memory controller, USB, CAN, and peripheral set as the rest of the high‑memory F103 family, making it a drop‑in upgrade for designs that need extra Flash headroom without changing package or pin‑out.
How does the STM32F103VFT6 compare to the VET6 and VGT6? When should I choose the VFT6?
All three share the same LQFP‑100 package, FSMC, and peripherals. The VET6 provides 512 KB Flash and 64 KB SRAM. The VGT6 offers 1 MB Flash and 96 KB SRAM. The VFT6 sits exactly in between: it gives you the same 96 KB SRAM as the VGT6, but with 768 KB of Flash—50% more than the VET6, yet more cost‑effective than the 1 MB VGT6. Choose the VFT6 when your firmware and assets exceed 512 KB but you do not need a full 1 MB, and you want to optimize cost while keeping the maximum SRAM of the F103 series.
Is 768 KB Flash and 96 KB SRAM enough for a complex industrial application with FSMC?
Absolutely. 768 KB of Flash provides generous room for a real‑time OS, multiple communication stacks (CANopen, Modbus), a graphical library, and application logic, with space left for future over‑the‑air updates. The 96 KB SRAM is the largest available in the STM32F103 series, giving you excellent headroom for communication buffers and real‑time data. Many industrial gateways, PLCs, and motor drives use this configuration without external RAM, though the FSMC is available if you need to add parallel PSRAM or NOR Flash.
What can I do with the FSMC on the STM32F103VFT6? How does the 100‑pin package affect it?
The FSMC (Flexible Static Memory Controller) allows you to connect external parallel NOR Flash, PSRAM, NAND Flash, and memory‑mapped LCDs. On the 100‑pin package, the FSMC data bus is limited to 8‑ or 16‑bit width due to the reduced I/O count compared to the 144‑pin variants. You can still connect a fast 16‑bit PSRAM for additional data buffering or drive a small TFT display. For a full 32‑bit wide external bus, the 144‑pin ZGT6 or a move to the F4 series is required.
How does the STM32F103VFT6 compare to the STM32F107? When should I pick the VFT6?
The STM32F107 is also an LQFP‑100 MCU, but it adds an Ethernet MAC and a second CAN while keeping the Flash at 256 KB and SRAM at 64 KB. The STM32F103VFT6 removes Ethernet and the second CAN, and in return gives you three times the Flash (768 KB) and 50% more SRAM (96 KB). Choose the VFT6 when your application does not need native Ethernet, or you can add it via an SPI‑to‑Ethernet controller, and your priority is maximizing on‑chip code and data storage. The F107 is better if Ethernet and dual CAN are mandatory.
Can the VFT6 replace an older STM32F103VET6 design? What benefits do I get?
Yes, the VFT6 is a direct, pin‑compatible upgrade from the VET6. You gain 50% more Flash (768 KB vs. 512 KB) and 50% more SRAM (96 KB vs. 64 KB) without any PCB changes. All peripherals and I/O assignments remain identical. This is the simplest way to extend the life of a proven F103 design, add new features, or accommodate larger firmware without redesigning the hardware.
Is the STM32F103VFT6 still a good choice for new designs, or should I move to the F2 or F4 series?
The VFT6 remains a strong candidate for designs that do not need the higher clock speeds, FPU, or advanced peripherals of the F2/F4. Its 768 KB Flash, 96 KB SRAM, and 100‑pin package are still very cost‑competitive, and the mature F1 ecosystem—libraries, tools, and community support—reduces development time and risk. If your application does not require Ethernet, a camera, or digital signal processing, the VFT6 offers a reliable, long‑term‑available platform with an exceptionally generous memory configuration for an F103.
What low‑power modes does the STM32F103VFT6 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 96 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 it is not as power‑efficient as the STM32L series, the VFT6 can still be used in battery‑powered devices that spend most of their time in deep sleep.
How can I perform over‑the‑air (OTA) firmware updates with the 768 KB single‑bank Flash?
The 768 KB Flash is well‑suited for OTA implementations. You can partition it into a bootloader, an active application area, and a download buffer, or even use an A/B scheme with two 384 KB slots. The 96 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 process without hardware dual‑bank Flash.
What are the most typical applications for the STM32F103VFT6?
It is widely used in industrial motor drives, building automation controllers, programmable logic controllers (PLCs), multi‑channel data loggers, medical instruments, and advanced consumer appliances. Any embedded system that needs a proven 32‑bit processor with an above‑average Flash capacity, the maximum F103 SRAM, the ability to expand with external memory, and a compact 100‑pin footprint will benefit from the VFT6.