STM8S105C6T3 - 16MHz 32KB 8-Bit MCU | STMicroelectronics
MPN: STM8S105C6T3 ✓ ActiveSTM8S105C6T3 Overview
An 8-bit microcontroller is a compact computing platform that integrates a CPU core, program memory, data memory, and peripherals into one device. The STM8S family belongs to the broader hierarchy of microcontrollers, embedded processors, and semiconductors. Its CISC architecture provides byte-oriented instruction handling and a relatively small hardware footprint, making it useful for cost-sensitive appliances, industrial controls, sensor nodes, and communication equipment.
Key features include 32 KB of Flash program memory, 2 KB of SRAM, a 10-bit ADC, UART, SPI, and I2C interfaces, and a maximum clock frequency of 16 MHz. The STM8S105xx access line also incorporates integrated true data EEPROM, allowing nonvolatile parameter retention without occupying the main Flash program area. A 48-LQFP package provides 38 I/O pins, offering substantial connectivity for displays, sensors, actuators, and external communication devices.
The device is manufactured using STMicroelectronics proprietary 130 nm embedded non-volatile memory technology. This implementation combines an 8-bit core with a state-of-the-art peripheral set while retaining a conventional 2.95 V to 5.5 V operating range. The 10-bit ADC supports analog measurement tasks, while UART, SPI, and I2C provide paths for external data acquisition, sensor connectivity, and communication with transducers or companion controllers.
Typical applications include compact motor and valve controllers, building and industrial automation modules, small sensor interfaces, appliance control boards, and low-cost communication peripherals. Designers can use the 38 available I/O ports for digital interfaces and the ADC for analog inputs, reducing the need for separate expansion components in moderately connected systems.
A critical design consideration is the STM8S105C6T3's temperature-grade and order-code designation. The suffix T3 must be checked against the required ambient-temperature range before production release. PCB design should also preserve the package pin arrangement and provide suitable bypass capacitance near the power pins.
This page combines verified manufacturer and distributor information, package characteristics, commercially available pricing, drop-in alternatives, comparison data, and practical engineering guidance to support component selection, PCB design, sourcing, and procurement decisions.
Drop-in alternatives for STM8S105C6T3 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with STM8S105C6T3 (same form factor and footprint) — differing in Package, Core.
STM8S105C6T6
✅ Drop-InContact for price
View Datasheet →STM8S103C6T3
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM8S005C6T6
✅ Drop-InContact for price
View Datasheet →STM8S105C6T3 Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit microcontroller |
| Series | STM8S access line |
| CPU Architecture | CISC |
| Maximum Clock Frequency | 16 MHz |
| Flash Program Memory | 32 KB (32K x 8) |
| SRAM | 2 KB |
| Operating Supply Voltage | 2.95 V to 5.5 V |
| ADC Resolution | 10-bit |
| I/O Port Count | 38 |
| Serial Interfaces | UART, SPI, and I2C |
| Package | 48-LQFP (7 x 7 mm) |
| Package Pin Count | 48 pins |
| Process Technology | 130 nm embedded non-volatile memory technology |
| Lifecycle Status | Active |
STM8S105C6T3 48 pins Pin Configuration Guide
Pin configuration for STM8S105C6T3 (48 pins package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for STM8S105C6T3.
Refer to the datasheet for full pin configuration.
Typical Applications
STM8S105C6T3 is suitable for 6 applications: Compact Industrial Control Module, Analog Sensor Acquisition, Appliance Control Board, Serial Communication Gateway, LED Lighting Controller, Battery-Powered Embedded Node.
Compact Industrial Control Module
The STM8S105C6T3 fits compact industrial-control modules because its 16 MHz STM8S core provides useful processing performance while 38 I/O ports allow multiple digital inputs, outputs, status indicators, and actuator connections to share one package. The 32 KB Flash supports control firmware, boot logic, and parameter tables, while the 2 KB SRAM supports intermediate calculations and communication buffers. Its 2.95 V to 5.5 V operating range accommodates common industrial supply rails. A UART or I2C interface can connect a local operator panel or sensor network, but engineers must confirm the T3 temperature rating and isolation requirements for the installation environment.
Recommended
Analog Sensor Acquisition
The STM8S105C6T3 is suitable for analog sensor acquisition because it integrates a 10-bit ADC while retaining 38 I/O pins for digital sensors, interrupt inputs, and status controls. A designer can sample analog transducers and combine the results with UART, SPI, or I2C communication in one controller. The 16 MHz clock provides adequate peripheral timing for many low-bandwidth measurement systems, while 32 KB of Flash accommodates calibration tables and application firmware. The 2.95 V minimum operating voltage supports 3.3 V systems, but sensor accuracy, input filtering, reference quality, and the final T3 temperature range must be evaluated independently of the MCU specifications.
Recommended
Appliance Control Board
The STM8S105C6T3 can serve as the central controller in an appliance because its 8-bit architecture, 32 KB Flash, and 38 I/O ports provide an efficient platform for buttons, relays, indicators, and motor-control signals. Its integrated ADC supports temperature, level, or position measurements, while UART or SPI can connect a display, sensor module, or communications daughterboard. The 48-LQFP package is practical for multilayer consumer-appliance boards, and the 2.95 V to 5.5 V range accommodates both 3.3 V and 5 V subsystems. Production designs should verify standby-current behavior, motor-transient immunity, and the environmental temperature requirement for the selected T3 suffix.
Recommended
Serial Communication Gateway
The STM8S105C6T3 suits a low-cost serial gateway because it combines UART, SPI, and I2C interfaces with enough Flash and SRAM for protocol conversion and buffering. A gateway can use UART for an external host, I2C for sensors, and SPI for a local transceiver or display, reducing the need for additional interface logic. Its 16 MHz CISC core and 32 KB Flash provide adequate resources for compact protocol stacks and firmware updates. The 48-LQFP footprint also leaves many pins available for status LEDs, reset control, and optional isolation. Designers must account for transceiver level differences, bus capacitance, grounding, and the T3 grade's environmental limits.
Recommended
LED Lighting Controller
The STM8S105C6T3 is well suited to an LED-lighting controller because its 38 I/O ports can drive multiple channels, switches, and fault inputs, while the 10-bit ADC can monitor a current-sense or temperature signal. The 16 MHz core provides enough timing flexibility for dimming sequences and communication updates, and 32 KB Flash can store multiple lighting profiles. The device operates from 2.95 V to 5.5 V and can coordinate a 5 V LED driver through PWM-capable outputs and external switching stages. In practice, keep high-current LED paths away from sensitive analog routing, use appropriate drive transistors, and confirm dimming accuracy against the MCU and power-stage tolerances.
Recommended
Battery-Powered Embedded Node
The STM8S105C6T3 can support a compact embedded sensing node when the design prioritizes low component count and flexible serial connectivity rather than advanced low-power operation. Its 32 KB Flash stores application code and configuration, 38 I/O ports connect sensors and indicators, and UART, SPI, and I2C provide expansion paths without additional bus controllers. The 2.95 V to 5.5 V range allows operation from common regulated battery rails. However, average current, standby behavior, and analog-block power consumption were not supplied in the verified data, so battery-life estimates require measurement. Engineers should also verify startup behavior, brownout margins, and whether the 48-LQFP package suits the enclosure's size constraints.
Recommended
Recommended Products Summary
Engineering reference data for STM8S105C6T3 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM8S105C6T6 | STM8S103C6T3 | STM8S005C6T6 |
|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Package | 48-LQFP (7 x 7 mm) | 48-LQFP (7 x 7 mm) - same | 48-LQFP (7 x 7 mm) - same | 48-LQFP (7 x 7 mm) - same |
| Product Type | 8-bit STM8S access-line microcontroller | 8-bit STM8S access-line microcontroller | 8-bit STM8S-family microcontroller | 8-bit STM8S mainstream microcontroller |
Key Differentiators
- Full STM8S105C6 access-line feature set (vs STM8S005C6T6)
- Same MCU platform with an available T6 family alternative (vs STM8S105C6T6)
- Verified source availability and active product status (vs STM8S103C6T3)
Design Notes
The verified operating range is 2.95 V to 5.5 V. Place the required supply bypass capacitors close to the STM8S105C6T3 power pins, with the ground return kept short and directly connected to the device ground plane. Confirm the exact pin names and recommended capacitor values from the official 48-LQFP pinout and datasheet before layout release; those values were not present in the supplied search excerpts.
Reserve the complete 48-LQFP 7 x 7 mm land pattern and follow the manufacturer package drawing for pin numbering. Place the MCU away from switching-regulator inductors, relay drivers, and high-current return paths to reduce analog and communications noise. The 38 I/O ports provide flexibility, but alternate adjacent signals only where the package and board-routing rules permit.
Do not assume that any STM8S105C6 order code is automatically interchangeable. Compare the T3 suffix, temperature range, pinout, memory organization, and shipping format against the schematic and BOM. Although STM8S105C6T6, STM8S103C6T3, and STM8S005C6T6 appear in the same 48-LQFP family, only the first and third were directly supported by the supplied comparison search results.
Compliance Information
The verified excerpts identify an active STM8S105C6 access-line product but do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than being inferred.