embedded-processors-controllers

STM8S903F3

Key datasheet specifications and the closest alternatives, ranked by parametric similarity and grounded in the manufacturer datasheet.

01 — Overview

This STMicroelectronics datasheet covers the STM8S903K3 and STM8S903F3, 16 MHz 8-bit MCUs featuring up to 8 KB Flash, 1 KB RAM, and 640 bytes EEPROM. The document details their scope for embedded control applications requiring low power consumption and flexible clock management. Key parameters include a supply voltage of 2.95-5.5 V, transmit power of +14 dBm (UART), and typical current of 9 mA in active mode. It also describes three timers, UART, SPI, I²C interfaces, and various interrupt capabilities across multiple package options.

02 — Key specifications

Datasheet parameters

ParameterMinTypMaxConditions
quiescent current — 2 mA 2.35 mA fCPU = fMASTER = 16 MHz; HSE user ext. clock (16 MHz)
supply voltage range -300 mV — 6.5 V
operating temperature -40 °C — 85 °C Maximum power dissipation
clock frequency 0 Hz — 16 MHz
power dissipation — — 182 mW TSSOP20
cpu speed — 16 MHz —
program memory size — 8.19 kB —
ram size — 1.02 kB —
io count — 16 —
adc resolution — 10 bit —
core size — 8 bit —
rise time — — 25 ns Capacitive load: C = 30 pF
data retention 20 year — — TRET = 55°C
program erase cycles 300 kcycle 1 Mcycle — TA = +125 °C
load capacitance — — 20 pF
03 — Alternatives

Closest matches to STM8S903F3

STM8S003F3 1.3× higher power dissipation, similar adc resolution, similar clock frequency
STM8S105C4 2.4× higher power dissipation, 2.0× higher program memory size, 2.0× higher ram size
STM8L051F3P6 4.3× lower quiescent current, 1.7× lower supply voltage range, 1.2× higher adc resolution
STM8S001J3M3 3.7× lower power dissipation, 1.9× higher operating temperature, similar adc resolution
STM32L010F4P6 4.0× higher core size, 2.0× higher clock frequency, 2.0× higher cpu speed
PY32F002A 4.0× higher core size, 3.0× higher ram size, 2.5× higher program memory size
ATtiny1616 10.0× lower rise time, 3.2× lower clock frequency, 2.0× lower load capacitance
ATmega8A 2.0× higher clock frequency, 1.3× higher supply voltage range, similar adc resolution
04 — FAQ

Frequently asked questions

What is the ADC resolution of the STM8S903F3?

The ADC resolution is 10 bit.

What is the maximum clock frequency of the STM8S903F3?

The maximum clock frequency is 16 MHz.

What is the core size of the STM8S903F3?

The core size is 8 bit.

What is the maximum CPU speed of the STM8S903F3?

The maximum CPU speed is 16 MHz.

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

The data retention is 20 year at TRET = 55°C.

How many I/O pins does the STM8S903F3 have?

The STM8S903F3 has 16 I/O pins.

What is the specified load capacitance for the STM8S903F3?

The load capacitance is 20 pF.

What is the operating temperature under maximum power dissipation?

The operating temperature is 85 °C.

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