Quick answer
Choose the STM8S105K4T6 board if you need ready-to-use I/O headers and microUSB power; pick the STM8S103F3P6 board for the lowest possible cost when you are comfortable soldering your own connections.
Key differences at a glance
Both boards are built around STM8 microcontrollers and are designed for ultra-low-cost embedded control. The main differences are in I/O access and power options.
The STM8S105K4T6 board includes pre-soldered 2.54mm pitch headers and a microUSB connector for power, so you can start prototyping immediately. The STM8S103F3P6 board is cheaper but requires you to solder the headers yourself and does not include a microUSB connector.
Trade-offs at a glance
- Cost: The STM8S103F3P6 board is priced at USD 0.81 (catalog comparison price USD 1.24), while the STM8S105K4T6 board is USD 1.41 (catalog comparison price USD 2.08). The 103F3P6 is the more economical option.
- I/O access: The STM8S105K4T6 board comes with pre-soldered 2.54mm pitch headers, so you can plug in wires immediately. The STM8S103F3P6 board requires you to solder headers yourself, adding time and equipment needs. If you don't have a soldering iron or prefer a ready-to-use board, the 105K4T6 saves setup time.
- Power option: Only the STM8S105K4T6 board includes a microUSB connector for powering. The STM8S103F3P6 board lacks this feature, so you will need another way to supply power (e.g., battery or external regulator). For projects powered by a USB wall adapter or power bank, the 105K4T6 is the simpler choice.
Product facts
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STM8S105K4T6 Development Board: This development board provides convenient access to the device's I/O pins via standard 2.54mm pitch headers and includes a microUSB connector for powering. You can connect sensors and actuators without soldering, and power the board from a common USB cable—ideal for quick prototyping.
STM8S105K4T6 Development Board
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STM8S103F3 P6 Development Board: This development board provides convenient access to the device's I/O pins via standard 2.54mm pitch headers that require soldering. The lower price reflects the extra assembly effort, making it a good choice if you already have soldering equipment and want to minimize cost.
STM8S103F3 P6 Development Board
Which board fits your build?
Best for
- Quick prototyping and beginners: STM8S105K4T6 – pre-soldered headers and microUSB power let you start without extra tools.
- Cost-sensitive projects or bulk orders: STM8S103F3P6 – lowest unit price when you can handle soldering and power wiring.
Not for
- Projects that need plug-and-play USB power: STM8S103F3P6 lacks a microUSB connector.
- Builds where you want to avoid soldering: STM8S103F3P6 requires soldering headers.
