STM8S003F3

{
  "schema_version": 1,
  "type": "component",
  "slug": "stm8s003f3",
  "title": "STM8S003F3",
  "brief": "ST 8-bit STM8 value-line MCU, TSSOP-20. 16 MHz, 8 KB flash, 1 KB RAM, 128 B EEPROM. Ultra-low-cost. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "microcontroller",
    "mcu",
    "stm8",
    "8-bit",
    "tssop-20",
    "stmicroelectronics"
  ],
  "component": {
    "mpn": "STM8S003F3",
    "manufacturer": "STMicroelectronics",
    "package": "TSSOP-20",
    "pin_count": 20,
    "category": "Microcontroller",
    "subcategory": "8-bit STM8 MCU (value line)",
    "datasheet": "https://www.st.com/resource/en/datasheet/stm8s003f3.pdf",
    "parts": {
      "symbol": "stm8s003f3.kicad_sym",
      "footprint": "stm8s003f3.kicad_mod",
      "model_3d": "stm8s003f3-etched.glb",
      "model_3d_plain": "stm8s003f3.glb",
      "lbr": "stm8s003f3.lbr",
      "model_3d_step": "stm8s003f3-etched.step",
      "model_3d_step_plain": "stm8s003f3.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "PD4/BEEP/TIM2_CH1/UART1_CK",
        "type": "bidirectional",
        "description": "Port D bit 4. High-sink GPIO (fast/slow programmable, floating after reset). Muxed default alternate functions: TIM2 channel 1, BEEP output, and UART1 synchronous clock."
      },
      {
        "number": "2",
        "name": "PD5/AIN5/UART1_TX",
        "type": "bidirectional",
        "description": "Port D bit 5. High-sink GPIO. Muxed with ADC analog input 5 and UART1 data transmit."
      },
      {
        "number": "3",
        "name": "PD6/AIN6/UART1_RX",
        "type": "bidirectional",
        "description": "Port D bit 6. High-sink GPIO. Muxed with ADC analog input 6 and UART1 data receive."
      },
      {
        "number": "4",
        "name": "NRST",
        "type": "bidirectional",
        "description": "Active-low bidirectional reset with integrated weak pull-up. Asserted low by the internal POR/BOR, watchdog or an external reset source; can also be driven low externally to reset the device."
      },
      {
        "number": "5",
        "name": "PA1/OSCIN",
        "type": "bidirectional",
        "description": "Port A bit 1 (slow O1 output, floating after reset). Doubles as the HSE crystal/resonator input (OSCIN) or external clock input."
      },
      {
        "number": "6",
        "name": "PA2/OSCOUT",
        "type": "bidirectional",
        "description": "Port A bit 2 (slow O1 output, floating after reset). Doubles as the HSE crystal/resonator output (OSCOUT)."
      },
      {
        "number": "7",
        "name": "VSS",
        "type": "power_in",
        "description": "Digital ground return for VDD."
      },
      {
        "number": "8",
        "name": "VCAP",
        "type": "passive",
        "description": "Output of the internal 1.8 V core regulator. Requires an external stabilization capacitor to VSS (see Section 9.3.1 VCAP external capacitor). Do not drive externally."
      },
      {
        "number": "9",
        "name": "VDD",
        "type": "power_in",
        "description": "Main digital power supply, 2.95 V to 5.5 V operating range. Decouple locally to VSS."
      },
      {
        "number": "10",
        "name": "PA3/TIM2_CH3/[SPI_NSS]",
        "type": "bidirectional",
        "description": "Port A bit 3. High-sink GPIO. Default alternate function: TIM2 channel 3. When alternate-function remap bit AFR1 is programmed the pin instead becomes the SPI master/slave-select input (SPI_NSS)."
      },
      {
        "number": "11",
        "name": "PB5/I2C_SDA/[TIM1_BKIN]",
        "type": "bidirectional",
        "description": "Port B bit 5. True open-drain output (no P-buffer, no weak pull-up, no protection diode to VDD); an external pull-up is required. Default alternate function: I2C SDA data line. When AFR4 is programmed the pin becomes TIM1 break input (TIM1_BKIN)."
      },
      {
        "number": "12",
        "name": "PB4/I2C_SCL/[ADC_ETR]",
        "type": "bidirectional",
        "description": "Port B bit 4. True open-drain output (no P-buffer, no weak pull-up, no protection diode to VDD); external pull-up required. Default alternate function: I2C SCL clock. When AFR4 is programmed the pin becomes ADC external trigger (ADC_ETR)."
      },
      {
        "number": "13",
        "name": "PC3/TIM1_CH3/[TLI]/[TIM1_CH1N]",
        "type": "bidirectional",
        "description": "Port C bit 3. High-sink GPIO. Default alternate function: TIM1 channel 3. Remap options: top-level interrupt (TLI) via AFR3, or TIM1 complementary channel 1 (TIM1_CH1N) via AFR7."
      },
      {
        "number": "14",
        "name": "PC4/CLK_CCO/TIM1_CH4/AIN2/[TIM1_CH2N]",
        "type": "bidirectional",
        "description": "Port C bit 4. High-sink GPIO. Default alternate functions: configurable clock output (CCO), TIM1 channel 4, and ADC analog input 2. When AFR7 is programmed the pin becomes TIM1 complementary channel 2 (TIM1_CH2N)."
      },
      {
        "number": "15",
        "name": "PC5/SPI_SCK/[TIM2_CH1]",
        "type": "bidirectional",
        "description": "Port C bit 5. High-sink GPIO. Default alternate function: SPI clock (SCK). When AFR0 is programmed the pin becomes TIM2 channel 1."
      },
      {
        "number": "16",
        "name": "PC6/SPI_MOSI/[TIM1_CH1]",
        "type": "bidirectional",
        "description": "Port C bit 6. High-sink GPIO. Default alternate function: SPI master-out/slave-in (MOSI). When AFR0 is programmed the pin becomes TIM1 channel 1."
      },
      {
        "number": "17",
        "name": "PC7/SPI_MISO/[TIM1_CH2]",
        "type": "bidirectional",
        "description": "Port C bit 7. High-sink GPIO. Default alternate function: SPI master-in/slave-out (MISO). When AFR0 is programmed the pin becomes TIM1 channel 2."
      },
      {
        "number": "18",
        "name": "PD1/SWIM",
        "type": "bidirectional",
        "description": "Port D bit 1. High-sink GPIO with fast/slow programmability (O4). SWIM single-wire debug and in-circuit programming data pin. In input pull-up during reset phase and after internal reset release to allow SWIM entry."
      },
      {
        "number": "19",
        "name": "PD2/AIN3/[TIM2_CH3]",
        "type": "bidirectional",
        "description": "Port D bit 2. High-sink GPIO. Default alternate function: ADC analog input 3. When AFR1 is programmed the pin becomes TIM2 channel 3."
      },
      {
        "number": "20",
        "name": "PD3/AIN4/TIM2_CH2/ADC_ETR",
        "type": "bidirectional",
        "description": "Port D bit 3. High-sink GPIO. Default alternate functions: ADC analog input 4, TIM2 channel 2, and ADC external trigger (ADC_ETR)."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.st.com/resource/en/datasheet/stm8s003f3.pdf",
        "pages": 103,
        "sha256": "1a0775fefcda1553",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 20,
        "described": 20,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "stm8s003f3.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          6.5,
          1.2
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "97339947f3a7196470ec2f1d9f9b92bb2fc2ab66ad53be0cf105192585ef3c9a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "stm8s003f3-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          6.5,
          1.2
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "5e346ef51e9d25b70fb042eeb6ec35dc73e4230d703a8f085093b6ebd37afd8d",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Core": "8-bit STM8",
      "Max clock": "16 MHz",
      "Flash": "8 KB",
      "RAM": "1 KB",
      "EEPROM": "128 B (100k cycles)",
      "GPIO": "16",
      "ADC": "10-bit (5 ch)",
      "Serial": "UART + SPI + I2C",
      "Supply voltage": "2.95-5.5 V",
      "Package": "TSSOP-20"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "stm8s003f3",
    "stm8s003",
    "cheap mcu",
    "8-bit stm8",
    "20 cent microcontroller"
  ],
  "discovery_pitch": "STM8S003F3 8-bit STM8 value-line MCU (TSSOP-20) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "stm8s003f3.kicad_sym",
    "stm8s003f3.kicad_mod",
    "stm8s003f3.glb",
    "stm8s003f3.lbr",
    "docs/hero.png",
    "docs/stm8s003f3-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "stm8s003f3-etched.step"
  ],
  "variants": [
    {
      "mpn": "STM8S003F3P6 (TSSOP-20)",
      "kind": "packaging"
    },
    {
      "mpn": "STM8S003F3U6 (UFQFPN-20)",
      "kind": "packaging"
    }
  ]
}