STM8S105K4U6 STMicroelectronics Integrated Circuit (Quad Flat No-Lead) In Stock
STM8S105K4U6 is an 8-bit STM8 microcontroller from STMicroelectronics running at up to 16 MHz with 16 kB Flash and 1 kB RAM in a compact 32-pin VFQFPN package. It integrates ADC, timers, SPI, I2C, and UART peripherals for versatile embedded control applications. Available from stock worldwide with competitive pricing and fast shipping.
- Manufacturer
- STMicroelectronics
- Package
- Quad Flat No-Lead
- Pin Count
- 32
- Lifecycle
- ACTIVE
- Datasheet
- STM8S105K4U6 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 8-bit STM8 core operating at up to 16 MHz with efficient CISC instruction set
- 16 kB Flash program memory and 1 kB RAM for cost-effective embedded applications
- Rich peripheral set including ADC, SPI, I2C, UART, and multiple timers on a single chip
- Compact 32-pin VFQFPN package for space-constrained PCB designs with low power consumption
Applications
The STM8S105K4U6 is ideal for home appliance control panels, industrial sensors, and consumer electronics requiring reliable 8-bit processing at low cost. Its 16 MHz clock and integrated ADC make it well-suited for data acquisition, motor speed control, and user interface applications. The compact 32-pin VFQFPN package and wide operating voltage range also support battery-powered IoT edge nodes and remote monitoring systems.
Specifications
| Manufacturer Package Code | VFQFPN |
| YTEOL | 6 |
| Has ADC | YES |
| Bit Size | 8 |
| Boundary Scan | NO |
| CPU Family | STM8 |
| Clock Frequency-Max | 16MHz |
| DAC Channels | NO |
| DMA Channels | NO |
| Format | FIXED POINT |
| Integrated Cache | NO |
| JESD-30 Code | S-XQCC-N32 |
| JESD-609 Code | e3 |
| Low Power Mode | YES |
| Number of External Interrupts | 23 |
| Number of I/O Lines | 25 |
| Number of Serial I/Os | 1 |
| Number of Timers | 5 |
| On Chip Data RAM Width | 8 |
| On Chip Program ROM Width | 8 |
| PWM Channels | YES |
| Package Body Material | UNSPECIFIED |
| Package Equivalence Code | LCC32,.2SQ,20 |
| Package Shape | SQUARE |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| RAM (bytes) | 2048 |
| RAM (words) | 1024 |
| ROM (words) | 16384 |
| ROM Programmability | FLASH |
| Speed | 16MHz |
| Supply Current-Max | 8mA |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 3.3V |
| Supply Voltage-Nom | 3.3V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| uPs/uCs/Peripheral ICs Type | MICROCONTROLLER, RISC |
| Package | Quad Flat No-Lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 3 |
| HTS Code | 8542.31.00.15 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for STM8S105K4U6:
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Frequently Asked Questions
How much Flash memory does STM8S105K4U6 provide, and is it sufficient for typical embedded firmware?
The STM8S105K4U6 offers 16 kB of Flash program memory and 1 kB of RAM. This is sufficient for many embedded control applications, including sensor acquisition loops, state machines, and communication protocol stacks, particularly when using optimized C code with the STM8 CISC instruction set.
What clock speed does STM8S105K4U6 run at, and how does this compare to other STM8 variants?
The STM8S105K4U6 operates at a maximum clock frequency of 16 MHz. Within the STM8S family, this is a mid-range speed — the STM8S003 runs at 16 MHz too but with only 8 kB Flash, while STM8S207 variants reach 24 MHz with larger memory, giving designers a clear upgrade path.
Which package does STM8S105K4U6 use, and what are the PCB layout implications?
The STM8S105K4U6 uses a 32-pin VFQFPN (Very thin Fine pitch Quad Flat No-lead) package with 5 mm x 5 mm body dimensions. The exposed pad and leadless design improve thermal dissipation and allow tighter component placement, but require solder paste stencil printing for reliable assembly.
For a cost-sensitive appliance controller project, when does STM8S105K4U6 offer a better fit than an ARM Cortex-M0 device?
When the firmware footprint fits within 16 kB Flash and the performance requirement is under 16 MHz, the STM8S105K4U6 typically offers a lower bill-of-materials cost than equivalent Cortex-M0 parts. Its simplified 8-bit architecture also reduces software complexity for straightforward control loops needing fewer than 10 peripherals.
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About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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