Item specifics
Description
The STM32F103T8U6 is a medium-density performance line Cortex-M3 MCU from STMicroelectronics in a VFQFPN-36 package (6×6×0.88 mm). It features a 72 MHz Cortex-M3 core at 1.25 DMIPS/MHz with single-cycle multiplication and hardware division, 64 KB Flash, and 20 KB SRAM. This model is one of the smallest-pin-count USB+CAN devices in the STM32F103 family, offering a 36-pin ultra-compact package for space-constrained applications that still demand full performance. The MCU integrates CAN 2.0B, USB 2.0 FS, dual 12-bit ADCs (10 channels, 1 µs, dual-sample and hold), temperature sensor, 7-channel DMA, up to 7 timers (including 1×16-bit advanced-control with PWM/deadtime/emergency stop), and 9 communication interfaces (2×I2C/3×USART/2×SPI/USB/CAN). 26 I/Os, all 5 V-tolerant, mappable on 16 external interrupt vectors. Supply 2.0–3.6 V, -40–85 °C, ECOPACK®2. Comparison with similar models: Core specifications are identical to the STM32F103C8T6 (LQFP-48, 37 I/Os), with the package upgraded to VFQFPN-36 (6×6 mm). I/Os are reduced from 37 to 26, but the full CAN/USB/ADC/timer configuration is preserved, making this the only 36-pin option in the STM32F103 family.
Core: Arm Cortex-M3 72 MHz, 1.25 DMIPS/MHz, single-cycle multiplication/hardware division, SWD & JTAG debug Memory: 64 KB Flash, 20 KB SRAM, CRC, 96-bit unique ID CAN 2.0B + USB 2.0 FS: Rare dual interface in this class Dual 12-bit ADCs: 10 channels, 1 µs, 0–3.6 V, dual-sample and hold, temperature sensor 7-ch DMA: Supporting timers, ADC, SPI, I2C, USART Up to 7 Timers: 3×16-bit GP (IC/OC/PWM/quadrature encoder), 1×16-bit advanced-control (PWM/deadtime/emergency stop), 2×watchdogs, SysTick Communication: 2×I2C (SMBus/PMBus), 3×USART (ISO7816/LIN/IrDA), 2×SPI (18 Mbit/s), USB 2.0 FS, CAN 2.0B Low Power: Sleep/Stop/Standby, VBAT backup RTC and backup registers Clock: 4–16 MHz XTAL, 32 kHz RTC XTAL (calibrated), 8 MHz RC (factory-trimmed), 40 kHz RC, PLL I/Os: 26 fast I/Os, all 5 V-tolerant, mappable on 16 ext. interrupt vectors Supply/Temp: VDD 2.0 V–3.6 V, POR/PDR/PVD, -40 °C to 85 °C Package: VFQFPN-36 (6×6×0.88 mm), Tray
Industrial: Sensor transmitters, CAN nodes, small actuators Motor Control: Fans, pumps, small motors (advanced-control timer/PWM/deadtime) Consumer: Remote controls, handhelds, PC peripherals Medical: Handheld medical terminals IoT: Wireless sensors, environmental monitoring, smart home Automotive: Light control, window anti-pinch, sensor nodes (non-safety-critical) Compact Designs: Space-constrained portable devices requiring CAN/USB and full 32-bit performance
VFQFPN-36 Ultra-Compact: 6×6×0.88 mm, 26 I/Os — the smallest CAN/USB package in the STM32F103 family 72 MHz Cortex-M3: 1.25 DMIPS/MHz, single-cycle multiplication/hardware division CAN + USB Dual Interface: Rare in this class, full functionality preserved in a 36-pin package 64 KB Flash + 20 KB SRAM: Medium-density product line for medium-complexity applications Dual 12-bit ADCs: 10 channels, 1 µs, dual-sample and hold, temperature sensor 7-ch DMA: Direct peripheral-to-memory transfers, offloads CPU 7 Timers (incl. Advanced-Control): Advanced-control timer/PWM/deadtime/emergency stop + 3 GP timers/quadrature encoder 9 Communication Interfaces: 2×I2C + 3×USART + 2×SPI + USB + CAN 26 I/Os All 5 V-Tolerant Calendar RTC: VBAT backup Mature STM32 Ecosystem: CubeIDE/CubeMX/HAL/LL
Years of experience in the electronics industry. Trusted by global customers. Massive In-Stock Inventory – Ready to ship promptly BOM Matching Service – One-stop solution, save time PCBA Customization – Professional engineering team creates tailor-made solutions based on your needs Cost-Effective & Efficient – Better channel, better cost A dedicated team makes your procurement smoother. Contact us for BOM quotes or PCBA inquiries.
FAQ:
What is the STM32F103T8U6 and how does it differ from the STM32F103TBU6?
The STM32F103T8U6 is a 72 MHz Arm Cortex‑M3 microcontroller with 64 KB Flash and 20 KB SRAM, packed in a tiny VFQFPN‑36 package. It offers the same core, SRAM, and peripherals (CAN, USB, multiple serial interfaces) as the TBU6, but with half the Flash. This makes it the most cost‑sensitive member of the F103 family in a 36‑pin footprint, ideal for designs where every cent matters and the firmware is compact enough to fit in 64 KB.
Is 64 KB of Flash really enough for a CAN and USB application? What kind of projects fit in this space?
Absolutely. A dedicated CAN‑to‑USB bridge, a simple motor controller, or a basic sensor node with communication stacks can be tightly optimized into 64 KB. Using bare‑metal code or a lightweight RTOS with only essential features, many industrial and consumer products operate comfortably within this limit. If your firmware later outgrows the 64 KB, the pin‑compatible TBU6 (128 KB Flash) provides a direct drop‑in upgrade with no PCB changes.
Why choose the VFQFPN‑36 package over the larger LQFP‑48 or LQFP‑64? What are the trade‑offs?
The VFQFPN‑36 measures only 6 × 6 mm, saving significant board space and reducing PCB cost. It provides up to 26 I/Os, which is sufficient for CAN, USB, two USARTs, SPI, I2C, and a few GPIOs. You sacrifice the FSMC, some timers, and a higher pin count, but gain the smallest possible footprint for a fully‑featured Cortex‑M3 with CAN and USB. This package is perfect for miniature sensor nodes, USB dongles, and space‑constrained motor controllers.
Can the STM32F103T8U6 really run CAN and USB simultaneously with only 26 I/Os?
Yes, with careful pin planning. The CAN TX/RX pins and USB D+/D‑ signals are fixed and do not conflict. You can allocate CAN, USB, two USARTs, one SPI, one I2C, and still have a few GPIOs left. STM32CubeMX is essential for verifying the exact pin‑multiplexing. This makes the T8U6 a capable, ultra‑compact communication node for CAN‑to‑USB bridges, sensor gateways, and portable data loggers.
How does the STM32F103T8U6 compare to the STM32F103C8T6? Is it a drop‑in replacement?
Both share the same Cortex‑M3 core, 64 KB Flash, and 20 KB SRAM. The C8T6 comes in an LQFP‑48 package with 37 I/Os, while the T8U6 uses a smaller VFQFPN‑36 with 26 I/Os. The T8U6 is not a drop‑in replacement for the C8T6 due to different pinout, but it offers the same peripherals (CAN, USB, timers) in a much smaller footprint. Choose the T8U6 for new designs where board space is critical; the C8T6 is better when you need more I/Os and easier hand‑soldering.
Does the STM32F103T8U6 have a built‑in DAC or FSMC? What are my options for adding these features?
No, the T8U6 does not include a DAC or an FSMC. If you need an analog output, you can use an external SPI or I2C DAC chip, or generate a PWM signal with an RC low‑pass filter. For external memory, you can connect serial Flash or PSRAM via the SPI ports. If your design absolutely requires a built‑in DAC or FSMC, the larger STM32F103VCT6 (LQFP‑100) or F4 series are more suitable.
Is the STM32F103T8U6 suitable for battery‑powered devices? What are its low‑power capabilities?
The chip supports Sleep, Stop, and Standby modes. In Stop mode with all 20 KB SRAM retained, the typical current is around 14 µA. Wake‑up from Stop is fast enough to respond to CAN, USB, or external interrupts. While it is not as power‑efficient as the STM32L series, the T8U6 can still be used in battery‑powered sensors and portable instruments that spend most of their time in deep sleep and wake up periodically to process data and communicate.
Can I perform over‑the‑air (OTA) firmware updates with the 64 KB single‑bank Flash?
Yes. You can partition the 64 KB Flash into a very small bootloader (4–8 KB) and a compact application. The 20 KB SRAM can temporarily buffer the new firmware image received via USB, CAN, or an external wireless module. A CRC check ensures a safe update. An A/B update scheme is not practical with this Flash size; a download‑and‑overwrite approach is recommended.
What are the most typical applications for the STM32F103T8U6?
It is widely used in space‑constrained CAN nodes, USB‑to‑serial converters, miniature motor controllers, portable medical devices, and compact IoT sensor hubs. Any design that needs a proven 32‑bit processor with CAN and USB in the smallest possible footprint, at the lowest possible cost, will benefit from the T8U6's combination of performance, memory, and tiny VFQFPN‑36 package.
What development tools and libraries support the STM32F103T8U6? Is the F1 ecosystem mature?
The T8U6 is fully supported by STM32CubeIDE, Keil MDK, and IAR EWARM. The vast STM32F1 HAL/LL library, countless online tutorials, and community‑driven code examples make development straightforward. You can prototype on a NUCLEO‑F103RB board (64‑pin, same core and memory) and then easily migrate to the T8U6 by adjusting the pin‑out and linker script in CubeMX.