STM32L021D4P7

{
  "schema_version": 1,
  "type": "component",
  "slug": "stm32l021d4p7",
  "title": "STM32L021D4P7",
  "brief": "STMicroelectronics Microcontrollers (MCU/MPU/SOC), TSSOP-14. Pinout checked against ST's open pin data, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "embedded processors & controllers",
    "stm32l021d4p7",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "STM32L021D4P7",
    "manufacturer": "STMicroelectronics",
    "package": "TSSOP-14",
    "pin_count": 14,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Microcontrollers (MCU/MPU/SOC)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588922176892514304",
    "parts": {
      "symbol": "stm32l021d4p7.kicad_sym",
      "footprint": "stm32l021d4p7.kicad_mod",
      "model_3d": "stm32l021d4p7-hero.glb",
      "model_3d_plain": "stm32l021d4p7.glb",
      "model_3d_step": "stm32l021d4p7-etched.step",
      "model_3d_step_plain": "stm32l021d4p7.step",
      "lbr": "stm32l021d4p7.lbr"
    },
    "distributor_links": {
      "lcsc": 1340496,
      "digikey": "497-19666-ND",
      "mouser": "511-STM32L021D4P7"
    },
    "distributor_check": {
      "checked_at": "2026-10-06T17:30:00Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "497-19666-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "511-STM32L021D4P7",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "PB9-BOOT0",
        "type": "input",
        "description": "Boot memory selection input (BOOT0), active high, determines boot from Flash or system bootloader"
      },
      {
        "number": "2",
        "name": "PC14-OSC32_IN",
        "type": "bidirectional",
        "description": "32 kHz oscillator input for RTC, supports OSC32_IN function for external crystal connection"
      },
      {
        "number": "3",
        "name": "PC15-OSC32_OUT",
        "type": "bidirectional",
        "description": "32 kHz oscillator output for RTC, supports OSC32_OUT function for external crystal connection"
      },
      {
        "number": "4",
        "name": "NRST",
        "type": "bidirectional",
        "description": "Device reset input/output (active low) with embedded weak pull-up resistor, 5V tolerant"
      },
      {
        "number": "5",
        "name": "PA0-CK_IN",
        "type": "bidirectional",
        "description": "Port A bit 0, ADC channel 0, 3.3V tolerant ADC input, supports alternate functions USART2_RX, LPTIM1_IN1, TIM2_CH1, LPUART1_RX, COMP1_OUT"
      },
      {
        "number": "6",
        "name": "PA1",
        "type": "bidirectional",
        "description": "Port A bit 1, ADC channel 1, 5V tolerant I/O, supports alternate functions LPTIM1_IN2, TIM2_CH2, I2C1_SMBA, USART2_RTS_DE, LPUART1_TX, COMP1_INP"
      },
      {
        "number": "7",
        "name": "PA4",
        "type": "bidirectional",
        "description": "Port A bit 4, ADC channel 4, 3.3V tolerant ADC input, supports alternate functions SPI1_NSS, LPTIM1 inputs, I2C1_SCL, USART2_CK, LPUART1_TX, COMP2_OUT"
      },
      {
        "number": "8",
        "name": "PA7",
        "type": "bidirectional",
        "description": "Port A bit 7, ADC channel 7, 5V tolerant I/O, supports alternate functions SPI1_MOSI, LPTIM1_OUT, USART2_CTS, TIM21_ETR, COMP2_OUT, COMP2_INP"
      },
      {
        "number": "9",
        "name": "VSS",
        "type": "power_in",
        "description": "Digital and analog ground (GND)"
      },
      {
        "number": "10",
        "name": "VDD",
        "type": "power_in",
        "description": "Digital and analog power supply, 1.65V to 3.6V, internally connected to VDDA on TSSOP14 variant"
      },
      {
        "number": "11",
        "name": "PA9",
        "type": "bidirectional",
        "description": "Port A bit 9, 5V tolerant FM+ capable I/O with 20mA output drive, supports MCO, I2C1_SCL, LPTIM1_OUT, USART2_TX, TIM21_CH2, COMP1_OUT"
      },
      {
        "number": "12",
        "name": "PA10",
        "type": "bidirectional",
        "description": "Port A bit 10, 5V tolerant FM+ capable I/O with 20mA output drive, supports TIM21_CH1, I2C1_SDA, USART2_RX, TIM2_CH3, COMP1_OUT, RTC_REFIN"
      },
      {
        "number": "13",
        "name": "PA13",
        "type": "bidirectional",
        "description": "Port A bit 13, 5V tolerant FM+ capable I/O, Serial Wire Debug Data I/O (SWDIO), supports alternate functions LPTIM1_ETR, I2C1_SDA, SPI1_SCK, LPUART1_RX, COMP1_OUT"
      },
      {
        "number": "14",
        "name": "PA14",
        "type": "bidirectional",
        "description": "Port A bit 14, 5V tolerant I/O, Serial Wire Debug Clock (SWCLK), acts as SPI1_MISO when bootloader active, supports LPTIM1_OUT, I2C1_SMBA, USART2_TX, LPUART1_TX, COMP2_OUT"
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-4-5-20251001",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: PC14-OSC32_IN and PC15-OSC32_OUT (pins 2-3) are oscillator pins for 32kHz RTC crystal; verify actual; VDDA and VDD are internally connected on TSSOP14 package (note 4, page 40); confirm power distributi; PA14/SWCLK exhibits special behavior: acts as SPI1_MISO output when bootloader is active; see note 7",
          "1/14 pins cited to the wrong page (name found elsewhere): ['14:PA14@p36']"
        ],
        "pages_sent": 47,
        "cost_usd": 0.3094,
        "at": "2026-10-06T17:29:45"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588922176892514304",
        "pages": 114,
        "sha256": "97b23667dad711b9",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 14,
        "described": 14,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    }
  },
  "metadata": {
    "specs": {
      "Manufacturer": "STMicroelectronics",
      "Package": "TSSOP-14",
      "Category": "Embedded Processors & Controllers",
      "Pins": "14"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
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  "discovery_triggers": [
    "stm32l021d4p7"
  ],
  "discovery_pitch": "STM32L021D4P7 (STMicroelectronics) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
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    "stm32l021d4p7.step",
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  "visibility": {
    "public": true
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}