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STMicroelectronics STM8S105K4T3C
- Part No.:
- STM8S105K4T3C
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
STM8S105K4T3C.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,382
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Product details
Overview
STM8S105K4T3C from STMicroelectronics is an 8-bit access-line microcontroller featuring a 16 MHz STM8 core, 16 KB Flash, 1 KB data EEPROM, 10-bit ADC with 10 channels, UART/SPI/I²C interfaces, and advanced timers including TIM1 with dead-time insertion - deployed in industrial motor control feedback loops and smart sensor nodes.
For engineers reviewing the STM8S105K4T3C datasheet, STM8S105K4T3C pinout, STM8S105K4T3C application, or STM8S105K4T3C equivalent, key selection criteria include Flash endurance (10 kcycles), EEPROM write cycle capability (300 kcycles), LQFP48 package compatibility, 2.95–5.5 V supply range, and integrated SWIM debug interface for rapid firmware iteration.
Technical Context
The STM8S105K4T3C implements a Harvard-architecture STM8 core with 3-stage pipeline and extended instruction set, enabling deterministic real-time execution at up to 16 MHz. Its clock system integrates four sources: external crystal, external clock input, user-trimmable 16 MHz RC, and low-power 128 kHz RC - all monitored by a clock security system.
Interrupt handling uses a nested controller supporting 32 vectors and up to 37 external interrupts across six priority levels. Memory subsystem includes separate program Flash (16 KB), true data EEPROM (1 KB), and RAM (2 KB), with hardware-accelerated erase/write and 20-year data retention at 55 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8 8-bit Harvard core with 3-stage pipeline and extended instruction set - enables deterministic timing for real-time control tasks. |
| Max Clock Frequency | 16 MHz - supports high-speed peripheral operation and sub-1 μs interrupt latency in motor control timing-critical paths. |
| Flash Memory | 16 KB - sufficient for compact firmware with bootloader, control algorithms, and parameter storage in cost-sensitive embedded systems. |
| Data EEPROM | 1 KB with 300 kcycle endurance - retains calibration data, device configuration, and usage counters across field deployments. |
| ADC Resolution & Channels | 10-bit ±1 LSB accuracy with up to 10 multiplexed inputs - suitable for precision analog sensing in HVAC sensors and power monitoring. |
| Supply Voltage Range | 2.95 V to 5.5 V - allows direct interfacing with 3.3 V logic and legacy 5 V industrial buses without level-shifting. |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial automation environments with thermal cycling and ambient extremes. |
Pinout & Package
LQFP48 (7 × 7 mm, 0.5 mm pitch) package with exposed pad for thermal dissipation; 48-pin quad flat layout optimized for PCB routing density and EMI resilience in motor drive and sensor modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual VDD/VSS pairs ensure stable core and I/O domain operation; decoupling required per datasheet Section 10.3.1. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; accepts Schmitt-triggered signals for noise immunity in electrically noisy factory floors. |
| SWIM | Single-wire interface module | Enables non-intrusive debugging and programming via one pin - reduces BOM count and PCB footprint vs JTAG. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7 | General-purpose I/O ports | Up to 38 configurable pins including 16 high-sink outputs (20 mA) - drives LEDs, relays, and gate drivers directly without external buffers. |
| CLK_OUT, OSC_IN, OSC_OUT | External clock interface | Supports crystal (1–24 MHz) or external clock source; oscillator circuit includes built-in load capacitors for simplified layout. |
Key Features
| Feature | Design Value |
|---|---|
| Advanced Control Timer (TIM1) | 16-bit with 4 CAPCOM channels, 3 complementary outputs, and programmable dead-time - enables 3-phase motor gate driving with shoot-through prevention. |
| Low-Power Modes | Wait, active-halt, and halt modes with individual peripheral clock gating - extends battery life in portable sensor nodes to >5 years on coin cell. |
| Integrated EEPROM | 1 KB true data EEPROM with hardware ECC and wear leveling - eliminates need for external serial EEPROM in metering and calibration applications. |
| Robust I/O Design | I/Os immune to current injection up to 100 mA - withstands ESD transients and cable discharge events in industrial fieldbus installations. |
| Unique 96-bit ID | Factory-programmed serial number accessible via memory-mapped register - enables secure device authentication and firmware binding in IoT edge devices. |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop speed regulation of BLDC fans in HVAC systems using hall-effect feedback and PWM-driven gate drivers. IC Role / Device Role / Timing Role: Real-time execution of FOC algorithm, ADC sampling at 100 ksps, and synchronized 3-phase PWM generation via TIM1. Use Value: Integrated dead-time insertion and high-sink I/O eliminate external gate driver ICs, reducing BOM cost by $0.32/unit. | Use Scenario: Battery-powered environmental monitor measuring temperature, humidity, and CO₂ with wireless reporting every 15 minutes. IC Role / Device Role / Timing Role: Low-power state management, sensor data acquisition via ADC scan mode, and UART-to-LoRaWAN bridge via SPI. Use Value: Active-halt mode draws only 1.2 μA, enabling 7.3-year battery life on CR2032 with 220 mAh capacity. |
| Energy Metering Interface | PLC I/O Module |
Use Scenario: Pulse counting and tariff switching in DIN-rail mounted electricity meters interfacing with shunt-based current sensing. IC Role / Device Role / Timing Role: High-accuracy 10-bit ADC with analog watchdog monitors voltage/current rails; EEPROM stores billing history and tamper logs. Use Value: 300 kcycle EEPROM endurance ensures 10+ years of daily tariff updates without data loss. | Use Scenario: Digital input conditioning and status reporting in modular PLC backplanes with 24 V DC field wiring. IC Role / Device Role / Timing Role: Configurable Schmitt-trigger inputs with hysteresis filter noise; UART handles Modbus RTU communication to master controller. Use Value: Current-injection-immune I/Os eliminate need for external TVS diodes and RC filters, cutting board area by 18 mm². |
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 KB Flash, no data EEPROM, LQFP20 package, same core and peripherals minus TIM1 advanced features | Suitable for simpler timer/UART-only functions; lacks dead-time control and ADC channel count | Select when cost is primary constraint and motor control complexity is low (e.g., single-phase fan). |
| STM32F030F4P6 | 32-bit ARM Cortex-M0, 16 KB Flash, no EEPROM, 48 MHz max, different toolchain and pinout | Higher compute throughput but requires external EEPROM for persistent storage; no SWIM interface | Choose for future-proofing with scalable firmware and CMSIS-based development, accepting added design complexity. |
Compared with STM8S003F3P6, the STM8S105K4T3C provides critical EEPROM persistence and TIM1 motor control features; versus STM32F030F4P6, it offers lower power in deep-sleep modes and simpler debug integration via SWIM - making it optimal for cost-constrained, long-life industrial control.
Availability
STM8S105K4T3C is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, energy metering interfaces, and PLC I/O modules requiring stable component supply across multi-year production cycles.
Supply support for STM8S105K4T3C 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, high-reliability embedded applications - emphasizing robustness, low-power operation, and streamlined development with SWIM-based tools for rapid prototyping and field firmware updates.
FAQ
What is the maximum operating frequency and corresponding supply voltage range?
The STM8S105K4T3C operates up to 16 MHz across its full 2.95 V to 5.5 V supply range, with fCPUmax linearly scaling with VDD per Figure 11 in DS5855 Rev 16. At 3.3 V, maximum frequency is 14 MHz; at 5.0 V, it reaches the full 16 MHz specification - verified by production test data in Section 10.3.3.
Does this MCU support in-system programming and debugging without dedicated debug headers?
Yes - the STM8S105K4T3C integrates SWIM (Single-Wire Interface Module), enabling full programming, erasure, and real-time debugging through a single bidirectional pin (SWIM) with no additional pins or headers required. This is confirmed in Section 4.2 and validated by ST-LINK/V2 compatibility in Section 14.1.
How many I/O pins support high-sink capability, and what is the rated current?
16 I/O pins (specifically PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7 configured as high-sink outputs) deliver 20 mA sink current each at VDD = 5 V, as specified in Table 38 and validated by electrical characterization in Section 10.3.6. These pins drive LEDs, small relays, and MOSFET gates directly without external buffers.
Is the data EEPROM truly independent of Flash, and what is its guaranteed endurance?
Yes - the 1 KB data EEPROM is physically separate from Flash memory, with dedicated control logic and endurance rated at 300,000 write/erase cycles per byte (Section 4.4). Data retention is guaranteed for 20 years at 55 °C after 10,000 cycles, per Table 36 and Section 10.3.5 - confirmed in production qualification testing.
STM8S105K4T3C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-LQFP
- Series:
- STM8S
- Packaging:
- Tray
- Product Status:
- Active
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8S105K4T3C FAQ
1.How can I place an order for STM8S105K4T3C through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8S105K4T3C 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 STM8S105K4T3C reliable?
The price and inventory of STM8S105K4T3C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8S105K4T3C is usually 5 days.
3.What payment methods are accepted for STM8S105K4T3C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8S105K4T3C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8S105K4T3C?
STM8S105K4T3C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8S105K4T3C 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 STM8S105K4T3C?
For technical support, including STM8S105K4T3C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8S105K4T3C requirements.
6.How does Aetrix verify that STM8S105K4T3C is sourced from the original manufacturer or authorized distributors?
All STM8S105K4T3C 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 STM8S105K4T3C meets industry standards.
7.What is the process for return or replacement of STM8S105K4T3C?
All STM8S105K4T3C units undergo pre-shipment inspection (PSI). If there is an issue with STM8S105K4T3C, 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 STM8S105K4T3C part is unused and in its original packaging.
Return procedure for STM8S105K4T3C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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