embedded processors controllers

STM8S105

Every spec below is cited to the manufacturer datasheet. Pick your exact ordering code, compare the closest alternatives, then ask the assistant what it means for your design.

00 — Overview

What the STM8S105 family does

The STM8S105x family comprises 8-bit microcontrollers featuring a 16 MHz core, up to 32 Kbyte Flash, and 1 Kbyte EEPROM. Available in C, K, and S variants with 32, 44, or 48 pins, these devices operate on 2.95 to 5.5 V supplies. Key specifications include a 10-bit ADC, SPI up to 8 Mbit/s, I2C up to 400 kbit/s, and two 16-bit timers. The architecture supports up to 38 I/Os, 32 interrupts, and a 96-bit unique ID. Engineers typically select this MCU for embedded applications requiring robust I/O design, low power consumption, and integrated communication interfaces like UART, SPI, and I2C within compact LQFP or UFQFPN packages.

Next step

Start building with STM8S105 → Every number above is cited straight from the datasheet — ask what they mean for your design, and the assistant answers from the same source documents.

Ordering code: STM8S105C4STM8S105C6STM8S105K4STM8S105K6STM8S105S4

01 — Key specifications

STM8S105C4 datasheet parameters

Parameter	Min	Typ	Max	Conditions	Source
output current (abs max)	—	—	20 mA	iio; Current characteristics	ST datasheet, p. 57 — Table 17: Current characteristics
supply voltage range	2.95 V	—	5.5 V	fCPU≤ 16 MHz; vdd(all modes, execution/write/erase); Flash program memory/data EEPROM memory	ST datasheet, p. 72 — Table 36. Flash program memory/data EEPROM memory
abs max current (abs max)	—	—	100 mA		ST datasheet, p. 53 — Table 16. Current characteristics
operating temperature	-40 °C	—	125 °C	Maximum power dissipation; ta; General operating conditions	ST datasheet, p. 59 — Table 19: General operating conditions
power dissipation	—	—	443 mW	44- and 48-pin devices, with output on eight standard ports, two high sink ports and two open drain ports simultaneously(4); pd; General operating conditions	ST datasheet, p. 54 — Table 18. General operating conditions
cpu speed	—	16 MHz	—		ST datasheet, p. 11 — Table 1. STM8S105x4/6 access line features
program memory size	—	16 KB	—		ST datasheet, p. 11 — Table 1. STM8S105x4/6 access line features
ram size	—	2 KB	—		ST datasheet, p. 11 — Table 1. STM8S105x4/6 access line features
io count	—	38	—		ST datasheet, p. 11 — Table 1. STM8S105x4/6 access line features
adc resolution	—	10 bit	—		ST datasheet, p. 11 — Table 1. STM8S105x4/6 access line features
core size	—	8 bit	—		ST datasheet, p. 11 — Table 1. STM8S105x4/6 access line features
rise time	—	—	35 ns	Fast I/Os load = 50 pF; tr(10 % - 90 %); General characteristics	ST datasheet, p. 80 — General characteristics
fall time	—	—	300 ns	tf(sda)	ST datasheet, p. 84 — Table 43. I C characteristics
data retention	20 year	—	—	TRET = 55° C; tret(data memory); 10.3.5 Memory characteristics	ST datasheet, p. 79 — 10.3.5 Memory characteristics
program erase cycles	300 kcycle	1 Mcycle	—	TA = +125 °C; (data memory); Flash program memory/data EEPROM memory	ST datasheet, p. 72 — Table 36. Flash program memory/data EEPROM memory

02 — FAQ

STM8S105C4 frequently asked questions

What is the absolute maximum current rating for the STM8S105C4?

The absolute maximum current is 100 mA.

What is the ADC resolution of the STM8S105C4?

The ADC resolution is 10 bit.

What is the core size of the STM8S105C4?

The core size is 8 bit.

What is the maximum CPU speed of the STM8S105C4?

The maximum CPU speed is 16 MHz.

What is the data retention time for the STM8S105C4 memory at TRET = 55° C?

The data retention time is 20 year.

What is the fall time (tf(sda))?

The fall time (tf(sda)) is 300 ns.

What is the total number of I/O ports available on the STM8S105C4?

The STM8S105C4 has 38 I/O ports.

What is the maximum operating temperature under general operating conditions at maximum power dissipation?

The maximum operating temperature is 125 °C.

What is the output current (iio) for the STM8S105C4?

The output current (iio) is 20 mA.

What is the power dissipation for 44- and 48-pin devices with output on eight standard ports, two high sink ports and two open drain ports simultaneously under general operating conditions?

The power dissipation is 443 mW.

What is the program erase cycle endurance for the STM8S105C4 Flash program memory and data EEPROM memory at TA = +125 °C?

The program erase cycle endurance is 1 Mcycle at TA = +125 °C for the Flash program memory and data EEPROM memory.

What is the program memory size of the STM8S105C4?

The program memory size is 16 KB.

01 — Key specifications

STM8S105C6 datasheet parameters

Parameter	Min	Typ	Max	Conditions	Source
quiescent current	—	200 µA	320 µA	On; Operating mode; LSI RC osc.; idd(ah); Total current consumption in active halt mode at $ VDD = 5 \, V $	ST datasheet, p. 65 — Table 25: Total current consumption in active halt mode at
output current (abs max)	—	—	20 mA	iio; Current characteristics	ST datasheet, p. 57 — Table 17: Current characteristics
supply voltage range	2.95 V	—	5.5 V	fCPU≤ 16 MHz; vdd(all modes, execution/write/erase); Flash program memory/data EEPROM memory	ST datasheet, p. 78 — Table 37: Flash program memory/data EEPROM memory
abs max voltage (abs max)	—	—	50 mV		ST datasheet, p. 57 — 10.2 Absolute maximum ratings
operating temperature	-40 °C	—	125 °C	Maximum power dissipation; ta; General operating conditions	ST datasheet, p. 59 — Table 19: General operating conditions
clock frequency	1 MHz	—	4 MHz	VDDA = 2.95 to 5.5 V; fadc; ADC characteristics	ST datasheet, p. 96 — Table 45: ADC characteristics
power dissipation	—	—	443 mW	44 and 48-pin devices, with output on eight standard ports, two high sink ports and two open drain ports simultaneously(4); pd; General operating conditions	ST datasheet, p. 59 — Table 19: General operating conditions
cpu speed	—	16 MHz	—		ST datasheet, p. 9
program memory size	—	32 KB	—		ST datasheet, p. 9 — Table 2: STM8S105xx access line features
ram size	—	2 KB	—		ST datasheet, p. 9 — Table 2: STM8S105xx access line features
io count	—	38	—		ST datasheet, p. 9 — Table 2: STM8S105xx access line features
adc resolution	—	10 bit	—		ST datasheet, p. 96 — Table 45: ADC characteristics
core size	—	8 bit	—		ST datasheet, p. 9
rise time	—	—	35 ns	Fast I/Os load = 50 pF; tr(10 % - 90 %); General characteristics	ST datasheet, p. 80 — General characteristics
fall time	—	—	300 ns	tf(sda); I²C characteristics	ST datasheet, p. 94 — Table 44: I²C characteristics
data retention	20 year	—	—	TRET = 55° C; tret(data memory); 10.3.5 Memory characteristics	ST datasheet, p. 79 — 10.3.5 Memory characteristics
program erase cycles	300 kcycle	1 Mcycle	—	TA = +125 °C; (data memory); 10.3.5 Memory characteristics	ST datasheet, p. 79 — 10.3.5 Memory characteristics
load capacitance	—	—	20 pF	c; HSE oscillator characteristics	ST datasheet, p. 74 — Table 33: HSE oscillator characteristics

01 — Key specifications

STM8S105K4 datasheet parameters

Parameter	Min	Typ	Max	Conditions	Source
quiescent current	—	200 µA	320 µA	On; Operating mode; LSI RC osc. (128 kHz); idd(ah); Total current consumption in active halt mode at $ VDD = 5 \, V $	ST datasheet, p. 59 — Table 24. Total current consumption in active halt mode at
output current (abs max)	—	—	20 mA	iio; Current characteristics	ST datasheet, p. 57 — Table 17: Current characteristics
supply voltage range	2.95 V	—	5.5 V	fCPU≤ 16 MHz; vdd(all modes, execution/write/erase); Flash program memory/data EEPROM memory	ST datasheet, p. 72 — Table 36. Flash program memory/data EEPROM memory
abs max voltage (abs max)	—	—	50 mV		ST datasheet, p. 57 — 10.2 Absolute maximum ratings
abs max current (abs max)	—	—	100 mA		ST datasheet, p. 53 — Table 16. Current characteristics
operating temperature	-40 °C	—	125 °C	Maximum power dissipation; ta; General operating conditions	ST datasheet, p. 59 — Table 19: General operating conditions
clock frequency	1 MHz	—	4 MHz	VDD = 2.95 to 5.5 V; fadc; ADC characteristics	ST datasheet, p. 85 — Table 44. ADC characteristics
power dissipation	—	—	443 mW	44- and 48-pin devices, with output on eight standard ports, two high sink ports and two open drain ports simultaneously(4); pd; General operating conditions	ST datasheet, p. 54 — Table 18. General operating conditions
cpu speed	—	16 MHz	—		ST datasheet, p. 11 — Table 1. STM8S105x4/6 access line features
program memory size	—	16 KB	—		ST datasheet, p. 11 — Table 1. STM8S105x4/6 access line features
ram size	—	2 KB	—		ST datasheet, p. 11 — Table 1. STM8S105x4/6 access line features
io count	—	25	—		ST datasheet, p. 11 — Table 1. STM8S105x4/6 access line features
adc resolution	—	10 bit	—		ST datasheet, p. 11 — Table 1. STM8S105x4/6 access line features
core size	—	8 bit	—		ST datasheet, p. 11 — Table 1. STM8S105x4/6 access line features
rise time	—	—	35 ns	Fast I/Os load = 50 pF; tr(10 % - 90 %); General characteristics	ST datasheet, p. 80 — General characteristics
fall time	—	—	300 ns	tf(sda)	ST datasheet, p. 84 — Table 43. I C characteristics
data retention	20 year	—	—	TRET = 55° C; tret(data memory); 10.3.5 Memory characteristics	ST datasheet, p. 79 — 10.3.5 Memory characteristics
program erase cycles	300 kcycle	1 Mcycle	—	TA = +125 °C; (data memory); Flash program memory/data EEPROM memory	ST datasheet, p. 72 — Table 36. Flash program memory/data EEPROM memory
load capacitance	—	—	20 pF	c; HSE oscillator characteristics	ST datasheet, p. 67 — Table 32. HSE oscillator characteristics

01 — Key specifications

STM8S105K6 datasheet parameters

Parameter	Min	Typ	Max	Conditions	Source
quiescent current	—	200 µA	320 µA	On; Operating mode; LSI RC osc.; idd(ah); Total current consumption in active halt mode at $ VDD = 5 \, V $	ST datasheet, p. 65 — Table 25: Total current consumption in active halt mode at
output current (abs max)	—	—	20 mA	iio; Current characteristics	ST datasheet, p. 57 — Table 17: Current characteristics
supply voltage range	2.95 V	—	5.5 V	fCPU≤ 16 MHz; vdd(all modes, execution/write/erase); Flash program memory/data EEPROM memory	ST datasheet, p. 78 — Table 37: Flash program memory/data EEPROM memory
abs max voltage (abs max)	—	—	50 mV		ST datasheet, p. 57 — 10.2 Absolute maximum ratings
operating temperature	-40 °C	—	125 °C	Maximum power dissipation; ta; General operating conditions	ST datasheet, p. 59 — Table 19: General operating conditions
clock frequency	1 MHz	—	4 MHz	VDDA = 2.95 to 5.5 V; fadc; ADC characteristics	ST datasheet, p. 96 — Table 45: ADC characteristics
power dissipation	—	—	443 mW	44 and 48-pin devices, with output on eight standard ports, two high sink ports and two open drain ports simultaneously(4); pd; General operating conditions	ST datasheet, p. 59 — Table 19: General operating conditions
cpu speed	—	16 MHz	—		ST datasheet, p. 9
program memory size	—	32 KB	—		ST datasheet, p. 9 — Table 2: STM8S105xx access line features
ram size	—	2 KB	—		ST datasheet, p. 9 — Table 2: STM8S105xx access line features
io count	—	25	—		ST datasheet, p. 9 — Table 2: STM8S105xx access line features
adc resolution	—	10 bit	—		ST datasheet, p. 96 — Table 45: ADC characteristics
core size	—	8 bit	—		ST datasheet, p. 9
rise time	—	—	35 ns	Fast I/Os load = 50 pF; tr(10 % - 90 %); General characteristics	ST datasheet, p. 80 — General characteristics
fall time	—	—	300 ns	tf(sda); I²C characteristics	ST datasheet, p. 94 — Table 44: I²C characteristics
data retention	20 year	—	—	TRET = 55° C; tret(data memory); 10.3.5 Memory characteristics	ST datasheet, p. 79 — 10.3.5 Memory characteristics
program erase cycles	300 kcycle	1 Mcycle	—	TA = +125 °C; (data memory); 10.3.5 Memory characteristics	ST datasheet, p. 79 — 10.3.5 Memory characteristics
load capacitance	—	—	20 pF	c; HSE oscillator characteristics	ST datasheet, p. 74 — Table 33: HSE oscillator characteristics

01 — Key specifications

STM8S105S4 datasheet parameters

Parameter	Min	Typ	Max	Conditions	Source
quiescent current	—	200 µA	320 µA	On; Operating mode; LSI RC osc. (128 kHz); idd(ah); Total current consumption in active halt mode at $ VDD = 5 \, V $	ST datasheet, p. 59 — Table 24. Total current consumption in active halt mode at
output current (abs max)	—	—	20 mA	iio; Current characteristics	ST datasheet, p. 57 — Table 17: Current characteristics
supply voltage range	2.95 V	—	5.5 V	fCPU≤ 16 MHz; vdd(all modes, execution/write/erase); Flash program memory/data EEPROM memory	ST datasheet, p. 72 — Table 36. Flash program memory/data EEPROM memory
abs max voltage (abs max)	—	—	50 mV		ST datasheet, p. 57 — 10.2 Absolute maximum ratings
abs max current (abs max)	—	—	100 mA		ST datasheet, p. 53 — Table 16. Current characteristics
operating temperature	-40 °C	—	125 °C	Maximum power dissipation; ta; General operating conditions	ST datasheet, p. 59 — Table 19: General operating conditions
clock frequency	1 MHz	—	4 MHz	VDD = 2.95 to 5.5 V; fadc; ADC characteristics	ST datasheet, p. 85 — Table 44. ADC characteristics
power dissipation	—	—	443 mW	44- and 48-pin devices, with output on eight standard ports, two high sink ports and two open drain ports simultaneously(4); pd; General operating conditions	ST datasheet, p. 54 — Table 18. General operating conditions
cpu speed	—	16 MHz	—		ST datasheet, p. 11 — Table 1. STM8S105x4/6 access line features
program memory size	—	16 KB	—		ST datasheet, p. 11 — Table 1. STM8S105x4/6 access line features
ram size	—	2 KB	—		ST datasheet, p. 11 — Table 1. STM8S105x4/6 access line features
io count	—	34	—		ST datasheet, p. 11 — Table 1. STM8S105x4/6 access line features
adc resolution	—	10 bit	—		ST datasheet, p. 11 — Table 1. STM8S105x4/6 access line features
core size	—	8 bit	—		ST datasheet, p. 11 — Table 1. STM8S105x4/6 access line features
rise time	—	—	35 ns	Fast I/Os load = 50 pF; tr(10 % - 90 %); General characteristics	ST datasheet, p. 80 — General characteristics
fall time	—	—	300 ns	tf(sda)	ST datasheet, p. 84 — Table 43. I C characteristics
data retention	20 year	—	—	TRET = 55° C; tret(data memory); 10.3.5 Memory characteristics	ST datasheet, p. 79 — 10.3.5 Memory characteristics
program erase cycles	300 kcycle	1 Mcycle	—	TA = +125 °C; (data memory); Flash program memory/data EEPROM memory	ST datasheet, p. 72 — Table 36. Flash program memory/data EEPROM memory
load capacitance	—	—	20 pF	c; HSE oscillator characteristics	ST datasheet, p. 67 — Table 32. HSE oscillator characteristics

03 — Alternatives

Closest matches to STM8S105

STM8L052C6 2.0× higher program memory size, 1.6× lower supply voltage range, 1.5× lower power dissipation

STM8L051F3P6 2.4× lower power dissipation, 2.0× lower program memory size, 2.0× lower ram size

STM8S003F3 2.0× lower program memory size, 2.0× lower ram size, 1.9× lower power dissipation

STM8S903F3 2.4× lower power dissipation, 2.4× lower quiescent current, 2.0× lower program memory size

STM8S001J3M3 9.0× lower power dissipation, 2.0× lower program memory size, 2.0× lower ram size

PY32F002A 15.0× lower fall time, 5.8× lower rise time, 4.0× higher core size

STM32F030K6T6 11.4× lower quiescent current, 4.0× higher core size, 3.6× higher rise time

STM32L011D3 4.0× higher core size, 4.0× lower quiescent current, 2.4× lower fall time

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