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STMicroelectronics STM8S105K4B6
- Part No.:
- STM8S105K4B6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-SDIP (0.400", 10.16mm)
- Datasheet:
-
STM8S105K4B6.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 32SDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,082
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Product details
Overview
STM8S105K4B6 from STMicroelectronics is an 8-bit access-line microcontroller featuring a 16 MHz STM8 core, 16 Kbyte Flash, 1 Kbyte data EEPROM, 10-bit ADC with 10 channels, and integrated UART, SPI, and I²C interfaces. It operates from 2.95–5.5 V and supports low-power modes including active-halt and halt-used in industrial sensor nodes requiring deterministic real-time control and nonvolatile parameter storage.
For engineers reviewing the STM8S105K4B6 datasheet, STM8S105K4B6 pinout, STM8S105K4B6 application, or STM8S105K4B6 equivalent, key selection criteria include Flash endurance (10 kcycles), EEPROM retention (20 years at 55 °C), 16-channel I/O capability with high-sink outputs, and SWIM single-wire debug interface compatibility.
Technical Context
The STM8S105K4B6 implements a Harvard-architecture 8-bit core with 3-stage pipeline and extended instruction set, enabling efficient C code execution and deterministic interrupt latency. Its clock system integrates four sources: user-trimmable 16 MHz RC, 128 kHz low-power RC, crystal oscillator, and external clock input-with clock security monitor for fail-safe operation.
Interrupt handling uses a nested controller supporting 32 vectors and up to 37 external interrupts across six priority levels. Memory subsystem includes segmented Flash (with option byte protection), true data EEPROM (300 kcycle endurance), and 2 Kbyte RAM-all mapped into unified address space with hardware CRC support for integrity checks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8 8-bit Harvard core with 3-stage pipeline and 16 MHz max frequency-enables deterministic timing for real-time control loops. |
| Flash Memory | 16 Kbyte program Flash with 10 kcycle endurance and 20-year data retention at 55 °C-supports field firmware updates without external memory. |
| Data EEPROM | 1 Kbyte true data EEPROM, 300 kcycle write endurance-stores calibration data, device IDs, or configuration parameters without external NV memory. |
| ADC | 10-bit SAR ADC with ±1 LSB INL, up to 10 multiplexed inputs and scan mode-sufficient for analog sensor interfacing (e.g., temperature, voltage monitoring). |
| Communication | UART (LIN master, SmartCard, IrDA), SPI (8 Mbit/s), I²C (400 kbit/s)-enables direct connection to sensors, displays, and host controllers without protocol translation. |
| Power Range | 2.95–5.5 V supply voltage with low-power wait/active-halt/halt modes-compatible with battery, industrial 3.3 V, and legacy 5 V systems. |
| I/O Capability | Up to 38 I/Os on LQFP48 package, including 16 high-sink outputs (20 mA) and robust current-injection immunity-drives LEDs, relays, and logic directly. |
Pinout & Package
LQFP48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, industrial temperature range (−40 to +85 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: VDD powers core/peripherals; VSS provides reference return-requires local 100 nF decoupling per VDD pin. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; accepts external push-button or supervisor IC assertion-ensures reliable startup after brownout. |
| SWIM | Single-wire interface module | Debug and programming interface using one bidirectional pin-enables in-circuit programming and real-time variable inspection without JTAG overhead. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7 | General-purpose I/O ports | Configurable as digital input/output, alternate function (UART/SPI/I²C), or analog input-supports remappable peripheral functions via option bytes. |
| CLK_OUT | Master clock output | Drives external logic or test equipment with buffered system clock-useful for synchronization or clock domain verification. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Data EEPROM | 1 Kbyte on-chip EEPROM with 300 kcycle endurance-eliminates need for external serial EEPROM in parameter storage applications. |
| Low-Power Clock System | Four selectable clock sources including trimmable 16 MHz RC and 128 kHz low-power RC-enables dynamic clock scaling to reduce active and standby current. |
| Robust I/O Design | High-sink outputs (20 mA), 5 V-tolerant inputs on selected pins, and immunity to 50 mA current injection-reduces need for external protection circuitry in noisy environments. |
| Hardware Watchdog | Dual watchdog: independent (IWDG) and window (WWDG)-provides fail-safe recovery for safety-critical embedded control where software hangs must be detected. |
| Unique 96-bit ID | Factory-programmed read-only identifier per device-enables secure device authentication, license binding, or traceability in production and field service. |
Applications
| Industrial Sensor Node | Smart HVAC Actuator |
|---|---|
Use Scenario: Standalone temperature/humidity node with local display and RS-485 backhaul. IC Role / Device Role / Timing Role: Main controller executing sensor polling, PID calculation, and UART-to-RS485 protocol conversion. Use Value: Integrated 10-bit ADC and UART with LIN master mode enable direct sensor and bus interfacing; 16 Kbyte Flash accommodates firmware + OTA update buffer. |
Use Scenario: Motorized damper control in commercial HVAC systems with position feedback and fault reporting. IC Role / Device Role / Timing Role: Real-time actuator controller managing PWM motor drive, analog position sensing, and I²C communication with central BMS. Use Value: High-sink I/Os drive motor driver enable lines directly; EEPROM stores calibration offsets and runtime counters for maintenance logging. |
| Programmable Power Supply Monitor | Legacy Equipment Interface Adapter |
Use Scenario: DIN-rail mounted voltage/current monitor for 24 V DC industrial power rails. IC Role / Device Role / Timing Role: Analog front-end controller sampling rail voltage via ADC, calculating RMS values, and triggering relay-based shutdown on overvoltage. Use Value: 2.95–5.5 V operating range matches 24 V supply with LDO; watchdog timers ensure recovery from transient faults without manual reset. |
Use Scenario: Protocol bridge between RS-232 legacy instruments and modern USB/Ethernet networks. IC Role / Device Role / Timing Role: UART-to-SPI/I²C translator with firmware-configurable baud rates and packet framing. Use Value: SWIM debug interface allows field firmware updates; 38 I/Os support GPIO-based handshaking and status LED control without external logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8S003F3P6 | 8 Kbyte Flash, no data EEPROM, 1 Kbyte RAM, same core and peripherals-lower cost but lacks nonvolatile parameter storage. | Suitable for fixed-function devices where calibration data is factory-programmed only. | Select when budget constraints outweigh need for field-updatable configuration storage. |
| STM32F030F4P6 | 32-bit ARM Cortex-M0, 16 Kbyte Flash, no EEPROM, 4 Kbyte RAM, higher performance but larger code footprint and no native SWIM interface. | Better for complex control algorithms or future scalability needs-but requires different toolchain and debug infrastructure. | Choose when migrating toward 32-bit ecosystem or needing higher compute throughput, accepting increased design complexity. |
Compared with STM8S003F3P6, STM8S105K4B6 adds critical EEPROM for runtime parameter persistence; versus STM32F030F4P6, it offers simpler tooling, lower power in deep-sleep modes, and proven SWIM-based field update capability-making it optimal for cost-sensitive, maintenance-aware industrial edge nodes.
Availability
STM8S105K4B6 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart HVAC actuators, programmable power monitors, and legacy equipment interface adapters requiring stable component supply and long-term manufacturability.
Supply support for STM8S105K4B6 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and analog components for industrial, automotive, and consumer markets.
The STM8S series targets cost-sensitive, reliability-critical embedded applications-designed for deterministic real-time control, low-power operation, and simplified development with minimal external components.
FAQ
What is the maximum operating frequency of the STM8S105K4B6?
The STM8S105K4B6 supports a maximum CPU frequency of 16 MHz, achievable with the internal user-trimmable RC oscillator, external crystal, or external clock source. This frequency is guaranteed across the full industrial temperature range (−40 to +85 °C) and supply voltage (2.95–5.5 V), with timing validated per Section 10.3.3 of the DS5855 datasheet.
Does the STM8S105K4B6 include hardware debug support?
Yes-it features the Single-Wire Interface Module (SWIM), a dedicated 1-pin debug interface supporting full in-circuit programming, breakpoint setting, register inspection, and real-time variable monitoring. SWIM requires no additional pins beyond the SWIM pin and ground, and is supported by ST Visual Develop (STVD) and STVP tools.
Can the internal EEPROM be used for storing calibration data?
Yes-the 1 Kbyte true data EEPROM is rated for 300,000 write/erase cycles and retains data for 20 years at 55 °C. It is accessed via dedicated EEPROM programming instructions and supports byte-level writes, making it ideal for storing sensor calibration coefficients, device-specific settings, or runtime counters without wear-leveling firmware.
What packaging options are available for the STM8S105K4B6?
The STM8S105K4B6 is offered exclusively in LQFP48 (7 × 7 mm, 0.5 mm pitch) packaging, as confirmed in Section 11.1 of the DS5855 datasheet. Other variants like LQFP32 or UFQFPN32 apply to different part numbers (e.g., STM8S105K4T6), not the K4B6 suffix, which denotes LQFP48 with industrial temperature grade.
STM8S105K4B6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-SDIP (0.400", 10.16mm)
- Series:
- STM8S
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- STM8
- Core Size:
- 8-Bit
- Speed:
- 16MHz
- Connectivity:
- I2C, IrDA, LINbus, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 25
- Program Memory Size:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 1K x 8
- RAM Size:
- 2K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.95V ~ 5.5V
- Data Converters:
- A/D 7x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
STM8S105K4B6 FAQ
1.How can I place an order for STM8S105K4B6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8S105K4B6 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM8S105K4B6 reliable?
The price and inventory of STM8S105K4B6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8S105K4B6 is usually 5 days.
3.What payment methods are accepted for STM8S105K4B6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8S105K4B6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8S105K4B6?
STM8S105K4B6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8S105K4B6 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM8S105K4B6?
For technical support, including STM8S105K4B6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8S105K4B6 requirements.
6.How does Aetrix verify that STM8S105K4B6 is sourced from the original manufacturer or authorized distributors?
All STM8S105K4B6 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM8S105K4B6 meets industry standards.
7.What is the process for return or replacement of STM8S105K4B6?
All STM8S105K4B6 units undergo pre-shipment inspection (PSI). If there is an issue with STM8S105K4B6, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM8S105K4B6 part is unused and in its original packaging.
Return procedure for STM8S105K4B6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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