STM8S003F3P6 - 8-bit MCU 8KB Flash 16MHz TSSOP-20 | STMicroelectronics
MPN: STM8S003F3P6 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.62 | $0.62 |
| 10 | $0.56 | $5.60 |
| 100 | $0.48 | $48.00 |
| 500 | $0.42 | $210.00 |
| 1,000 | $0.36 | $360.00 |
STM8S003F3P6 Overview
An 8-bit microcontroller (MCU) is a single-chip computer integrating an 8-bit CPU, program memory, data memory, and programmable peripherals. The STM8S003F3P6 belongs to the STM8S series within the STM8 family, positioned below the 32-bit STM32 series in STMicroelectronics' product hierarchy and targeting cost-sensitive embedded control.
Key features include 8 KB Flash with integrated true EEPROM (up to 100,000 write/erase cycles), a 10-bit ADC with 5 channels, and UART, SPI, and I2C interfaces. The device operates from 2.95V to 5.5V, supporting both 3.3V and 5V systems, with 16 programmable I/Os and 7 timers/counters including a 16-bit timer, an 8-bit timer, and watchdog timers.
The STM8 core uses a Harvard-architecture 3-stage pipeline delivering 16 MIPS at 16 MHz. An internal 16 MHz RC oscillator eliminates the need for an external crystal in many designs. Low-power modes include Halt, Active-Halt, and Wait, with 3.6 mA typical in Run mode at 16 MHz and about 1 uA in Halt mode.
Typical applications include home appliances, industrial control, consumer electronics, motor control helpers, and sensor interfaces. Its wide voltage range and robust I/O make it popular in white goods, power tools, and battery-powered devices, while the integrated EEPROM removes external non-volatile memory from the BOM.
Design tip: decouple VDD with a 100 nF capacitor placed close to the pin. The internal RC is accurate to approximately 2%, so use an external crystal when precise timing is required. SWIM single-wire in-circuit programming simplifies firmware updates.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes beyond the ST datasheet, as of 2026-08-29.
Drop-in alternatives for STM8S003F3P6 β 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 STM8S003F3P6 (same form factor and footprint) β differing in ADC Resolution, Core, Package.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
STM8S103F3P6
β Drop-Inπ Reference alternative (not in catalog)
STM8L051F3P6
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
STM8S903F3P6
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
N76E003AT20
β Drop-Inπ Reference alternative (not in catalog)
MM32F0010A1T
β Drop-Inπ Reference alternative (not in catalog)
STM8S003F3P6 Maximum Ratings & Electrical Characteristics
| Core | STM8 8-bit |
| Max CPU Frequency | 16 MHz |
| Performance | 16 MIPS |
| Flash Memory | 8 KB |
| RAM | 1 KB |
| Data EEPROM | 128 bytes |
| Supply Voltage | 2.95 V to 5.5 V |
| Timers/Counters | 7 |
| ADC Resolution | 10-bit, 5 channels |
| Communication Interfaces | UART, SPI, I2C |
| Programmable I/Os | 16 |
| Watchdog Timer | Yes (independent + window) |
| Run Mode Current | 3.6 mA typical at 16 MHz |
| Halt Mode Current | approx. 1 uA |
| Operating Temperature | -40C to +85C |
| Package | 20-TSSOP |
| Mounting Type | Surface Mount |
| Programming Interface | SWIM |
| RoHS Status | Compliant |
STM8S003F3P6 Pin Configuration
| Pin 1 | PD4 β I/O / UART1_CK / TIM1_BKIN |
| Pin 2 | PD5 β I/O / UART1_TX (also used for SWIM programming) |
| Pin 3 | PD6 β I/O / UART1_RX |
| Pin 4 | NRST β Active-low reset / input |
| Pin 5 | PA1 β I/O / OSCIN (external crystal input) |
| Pin 6 | PA2 β I/O / OSCOUT (external crystal output) |
| Pin 7 | VSS β Ground |
| Pin 8 | VCAP β 1uF capacitor to ground for internal regulator |
| Pin 9 | VDD β Power supply 2.95V to 5.5V |
| Pin 10 | PA3 β I/O / TIM2_CH3 |
| Pin 11 | PB5 β I/O / ADC channel / I2C-related |
| Pin 12 | PB4 β I/O / ADC channel |
| Pin 13 | PC3 β I/O / TIM1_CH3 / SPI related |
| Pin 14 | PC4 β I/O / TIM1_CH4 / ADC channel |
| Pin 15 | PC5 β I/O / SPI_SCK |
| Pin 16 | PC6 β I/O / SPI_MOSI / TIM1_CH1 |
| Pin 17 | PC7 β I/O / SPI_MISO / TIM1_CH2 |
| Pin 18 | PD1 β I/O / SWIM data interface |
| Pin 19 | PD2 β I/O / ADC channel / TIM2_CH3 |
| Pin 20 | PD3 β I/O / ADC channel / TIM2_CH2 |
Typical Applications
STM8S003F3P6 is suitable for 6 applications: Home Appliances, Industrial Control, Sensor Interfaces, Consumer Electronics, Battery-Powered Devices, Motor Control Assistance.
Home Appliances
The STM8S003F3P6 fits white goods control panels and small appliance boards where 5V-tolerant I/O and low BOM cost dominate. Its 2.95V-5.5V supply range allows direct connection to appliance 5V rails, and the 10-bit ADC reads temperature sensors and potentiometer settings across 5 channels. The 128-byte EEPROM stores user settings through power cycles with 100k-cycle endurance. Running at 16 MHz with the internal RC oscillator, no crystal is needed, trimming board cost; SWIM in-circuit programming supports factory firmware updates.
Recommended
Industrial Control
In industrial control nodes the STM8S003F3P6 provides watchdog timers (independent and window) for fail-safe operation, 16 robust I/Os for relay and LED driving, and a 16-bit timer for PWM generation. The -40C to +85C operating range covers cabinet environments. Its 3.6 mA run current suits always-on monitoring boards, and the UART links to RS-485 transceivers for fieldbus communication, keeping system cost well below 32-bit alternatives.
Recommended
Sensor Interfaces
The integrated 10-bit ADC with 5 channels makes the STM8S003F3P6 a compact analog front-end hub for resistive and voltage-output sensors. I2C and SPI interfaces connect digital sensors such as temperature, humidity, and pressure ICs, while the EEPROM stores per-device calibration constants. At about 1 uA in Halt mode, battery-powered sensor pods can duty-cycle the MCU for multi-year operation, waking via external interrupts or the wakeup timer.
Recommended
Consumer Electronics
For toys, chargers, lighting controls, and small display products, the STM8S003F3P6 delivers essential control logic at roughly $0.36 per unit at 1000 pieces (as of 2026-08-29). The 16 MHz internal oscillator eliminates crystal cost, and the TSSOP-20 footprint fits dense single-sided consumer boards. The 8-bit timer generates LED breathing effects and buzzer tones, while the 8 KB Flash comfortably hosts state machines, button debouncing, and simple communication protocols.
Recommended
Battery-Powered Devices
Power tools, meters, and portable products benefit from the STM8S003F3P6's Halt mode current of approximately 1 uA and Active-Halt mode with periodic wakeup. Combined with a 2.95V low end of supply, the MCU operates directly from two-cell or three-cell alkaline stacks and single-cell Li-ion via an LDO. The ADC monitors battery voltage through a divider, and EEPROM retains usage counters. A 100 nF VDD decoupling capacitor plus sleep discipline keeps quiescent drain negligible.
Recommended
Motor Control Assistance
While the STM8S003F3P6 does not replace dedicated motor MCUs, its 16-bit timer with PWM output and complementary drive capability handles fan drivers, small DC motor speed control, and gate-level coordination with external drivers. The 5V-tolerant I/O drives MOSFET driver inputs directly, the ADC reads current-sense amplifiers for over-current detection, and the watchdog guarantees shutdown on firmware lockup, which is essential for any motor-driving application.
Recommended
Recommended Products Summary
Engineering reference data for STM8S003F3P6 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM8S103F3P6 | N76E003AT20 | MM32F0010A1T |
|---|---|---|---|---|
| Package | 20-TSSOP | 20-TSSOP - same | 20-TSSOP - same | 20-TSSOP - same |
| Brand | STMicroelectronics | STMicroelectronics | Nuvoton Technology | MindMotion |
| Core | STM8 8-bit | STM8 8-bit | 8051 8-bit | ARM Cortex-M0 |
| Flash Memory | 8 KB | 8 KB | 18 KB | 32 KB |
| Max Frequency | 16 MHz | 16 MHz | 16 MHz | 48 MHz |
| Firmware Compatibility | STM8 toolchain (STVD/IAR) | STM8 toolchain - code compatible | Keil 8051 - rewrite required | ARM toolchain - port required |
Key Differentiators
- Lowest-cost STM8 value line entry (vs STM8S103F3P6)
- Integrated true EEPROM (vs N76E003AT20)
- Unified ST ecosystem portability (vs MM32F0010A1T)
Design Notes
Decouple VDD with a 100 nF ceramic capacitor placed as close to pin 9 as possible, and fit the mandatory 1 uF capacitor on VCAP (pin 8) for the internal 1.8V core regulator - omitting VCAP capacitance causes unreliable startup. Keep the NRST trace short and add a 100 nF reset capacitor plus 10k pull-up if the reset line is routed near switching noise sources.
The STM8S003 value line has a limited Flash write endurance budget and a locked option-byte scheme; write-protect misconfiguration can permanently disable SWIM access. Always enable SWIM read-out via option bytes before deploying, and verify the PD1/PD2 SWIM/OSC pin roles since SWIM shares UART TX and PD1 - reserve SWIM access on production test fixtures.
Use the Active-Halt or Halt modes for battery designs: Halt draws roughly 1 uA while Run at 16 MHz draws 3.6 mA typical. Wake sources in Halt are limited (external interrupt on configured pins, AWU timer), so verify your wake source is available on the chosen pin before committing the layout. The internal RC oscillator accuracy of about 2% limits UART baud error margins at high baud rates - test worst-case temperature corners.
ADC readings benefit from grounding: route analog sensor returns to VSS pin 7 directly and avoid sharing high-current I/O ground paths. Sample with the ADC in single-shot mode between PWM switching edges to reduce ripple-induced noise, and average 4-16 readings in firmware for the 10-bit converter's effective resolution.
Compliance Information
RoHS compliant and MSL 3 per distributor data (PartGenie). REACH and halogen-free status not stated in provided data.
