HT16C21A-28SSOP

{
  "schema_version": 1,
  "type": "component",
  "slug": "ht16c21a-28ssop",
  "title": "HT16C21A-28SSOP",
  "brief": "Holtek Semicon LCD Drivers, SSOP-28-150mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "led drivers",
    "ht16c21a-28ssop",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "HT16C21A-28SSOP",
    "manufacturer": "Holtek Semicon",
    "package": "SSOP-28-150mil",
    "pin_count": 28,
    "category": "LED Drivers",
    "subcategory": "LCD Drivers",
    "datasheet": "https://www.holtek.com.cn/webapi/116706/simHT16C21Av130.pdf",
    "parts": {
      "symbol": "ht16c21a-28ssop.kicad_sym",
      "footprint": "ht16c21a-28ssop.kicad_mod",
      "model_3d": "ht16c21a-28ssop-hero.glb",
      "model_3d_plain": "ht16c21a-28ssop-etched.glb",
      "model_3d_step": "ht16c21a-28ssop-etched.step",
      "model_3d_step_plain": "ht16c21a-28ssop.step",
      "lbr": "ht16c21a-28ssop.lbr"
    },
    "distributor_links": {
      "lcsc": "C5444716"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T16:45:23Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VDD",
        "type": "power_in",
        "description": "Positive power supply, operating range 2.4V to 5.5V."
      },
      {
        "number": "2",
        "name": "SDA",
        "type": "bidirectional",
        "description": "I2C interface serial data input/output."
      },
      {
        "number": "3",
        "name": "SCL",
        "type": "input",
        "description": "I2C interface serial clock input."
      },
      {
        "number": "4",
        "name": "VSS",
        "type": "power_in",
        "description": "Negative power supply, ground."
      },
      {
        "number": "5",
        "name": "COM0",
        "type": "output",
        "description": "LCD COM output."
      },
      {
        "number": "6",
        "name": "COM1",
        "type": "output",
        "description": "LCD COM output."
      },
      {
        "number": "7",
        "name": "COM2",
        "type": "output",
        "description": "LCD COM output."
      },
      {
        "number": "8",
        "name": "COM3",
        "type": "output",
        "description": "LCD COM output."
      },
      {
        "number": "9",
        "name": "COM4/SEG0",
        "type": "output",
        "description": "LCD COM/SEG multiplexed drive output."
      },
      {
        "number": "10",
        "name": "COM5/SEG1",
        "type": "output",
        "description": "LCD COM/SEG multiplexed drive output."
      },
      {
        "number": "11",
        "name": "COM6/SEG2",
        "type": "output",
        "description": "LCD COM/SEG multiplexed drive output."
      },
      {
        "number": "12",
        "name": "COM7/SEG3",
        "type": "output",
        "description": "LCD COM/SEG multiplexed drive output."
      },
      {
        "number": "13",
        "name": "SEG4",
        "type": "output",
        "description": "LCD SEG output."
      },
      {
        "number": "14",
        "name": "SEG5",
        "type": "output",
        "description": "LCD SEG output."
      },
      {
        "number": "15",
        "name": "SEG6",
        "type": "output",
        "description": "LCD SEG output."
      },
      {
        "number": "16",
        "name": "SEG7",
        "type": "output",
        "description": "LCD SEG output."
      },
      {
        "number": "17",
        "name": "SEG8",
        "type": "output",
        "description": "LCD SEG output."
      },
      {
        "number": "18",
        "name": "SEG9",
        "type": "output",
        "description": "LCD SEG output."
      },
      {
        "number": "19",
        "name": "SEG10",
        "type": "output",
        "description": "LCD SEG output."
      },
      {
        "number": "20",
        "name": "SEG11",
        "type": "output",
        "description": "LCD SEG output."
      },
      {
        "number": "21",
        "name": "SEG12",
        "type": "output",
        "description": "LCD SEG output."
      },
      {
        "number": "22",
        "name": "SEG13",
        "type": "output",
        "description": "LCD SEG output."
      },
      {
        "number": "23",
        "name": "SEG14",
        "type": "output",
        "description": "LCD SEG output."
      },
      {
        "number": "24",
        "name": "SEG15",
        "type": "output",
        "description": "LCD SEG output."
      },
      {
        "number": "25",
        "name": "SEG16",
        "type": "output",
        "description": "LCD SEG output."
      },
      {
        "number": "26",
        "name": "SEG17",
        "type": "output",
        "description": "LCD SEG output."
      },
      {
        "number": "27",
        "name": "SEG18",
        "type": "output",
        "description": "LCD SEG output."
      },
      {
        "number": "28",
        "name": "SEG19/VLCD",
        "type": "bidirectional",
        "description": "Shared SEG19 output or VLCD pin (set by the DE bit): as VLCD, an external resistor to VDD sets the bias voltage when internal adjustment is disabled, or it outputs the adjusted voltage for MCU sensing when enabled."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The pin diagram text extraction for the 28 SOP-A/SSOP-A is jumbled (pin numbers and names are listed; SEG19/VLCD is a shared multi-function pin. The datasheet does not give a single KiCad type; 'passive; These pins are multiplexed between COM and SEG functions depending on the duty setting (1/4 vs 1/8)."
        ],
        "pages_sent": 35,
        "cost_usd": 0.1152,
        "at": "2026-10-18T16:45:04"
      },
      "datasheet": {
        "url": "https://www.holtek.com.cn/webapi/116706/simHT16C21Av130.pdf",
        "pages": 35,
        "sha256": "9e2057530a66f187",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 28,
        "described": 28,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "ht16c21a-28ssop.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          7.8,
          10.2,
          2.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "7aa76979ae41da44bded1ed74115012868f2f3f5a757faf32bb9df4f92c1e313",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ht16c21a-28ssop-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          7.8,
          10.2,
          2.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "76792d76d1ef47b9f8117929bf7cfb39e1d572b0a20b41467082ac8938c8c738",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Holtek Semicon",
      "Package": "SSOP-28-150mil",
      "Category": "LED Drivers",
      "Pins": "28"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "9e2057530a66f1872beb4570966bd91954bd4d6919e5360c23274d59fb7be801",
      "rows": [
        {
          "name": "Operating voltage",
          "symbol": "VDD",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 2.4,
          "typ": null,
          "max": 5.5,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Operating current (display on, 1/3 bias, 80Hz)",
          "symbol": "IDD",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 18,
          "max": 36,
          "conditions": "3V 无负载，VLCD=VDD，1/3 bias，fLCD=80Hz，LCD显示开启，内部系统振荡器开启，DA0~DA3=0000",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Operating current (display on, 1/3 bias, 80Hz)",
          "symbol": "IDD",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 25,
          "max": 50,
          "conditions": "5V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Operating current (display off)",
          "symbol": "IDD1",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 2,
          "max": 5,
          "conditions": "3V 无负载，VLCD=VDD，1/3 bias，fLCD=80Hz，LCD显示关闭，内部系统振荡器开启，DA0~DA3=0000",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Operating current (display off)",
          "symbol": "IDD1",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 4,
          "max": 10,
          "conditions": "5V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Standby current",
          "symbol": "ISTB",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "3V 无负载，VLCD=VDD，LCD显示关闭，内部系统振荡器关闭",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Standby current",
          "symbol": "ISTB",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": null,
          "max": 2,
          "conditions": "5V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Low-level input voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": 0,
          "typ": null,
          "max": null,
          "conditions": "SDA，SCL",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Input leakage current",
          "symbol": "IIL",
          "kind": "electrical",
          "unit": "μA",
          "min": -1,
          "typ": null,
          "max": 1,
          "conditions": "VIN=VSS 或 VDD",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Low-level output current (SDA)",
          "symbol": "IOL",
          "kind": "electrical",
          "unit": "mA",
          "min": 3,
          "typ": null,
          "max": null,
          "conditions": "3V, VOL=0.4V, SDA pin",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Low-level output current (SDA)",
          "symbol": "IOL",
          "kind": "electrical",
          "unit": "mA",
          "min": 6,
          "typ": null,
          "max": null,
          "conditions": "5V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "LCD COM sink current",
          "symbol": "IOL1",
          "kind": "electrical",
          "unit": "μA",
          "min": 250,
          "typ": 400,
          "max": null,
          "conditions": "3V, VLCD=3V, VOL=0.3V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "LCD COM sink current",
          "symbol": "IOL1",
          "kind": "electrical",
          "unit": "μA",
          "min": 500,
          "typ": 800,
          "max": null,
          "conditions": "5V, VLCD=5V, VOL=0.5V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "LCD COM source current",
          "symbol": "IOH1",
          "kind": "electrical",
          "unit": "μA",
          "min": -140,
          "typ": -230,
          "max": null,
          "conditions": "3V, VLCD=3V, VOH=2.7V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "LCD COM source current",
          "symbol": "IOH1",
          "kind": "electrical",
          "unit": "μA",
          "min": -300,
          "typ": -500,
          "max": null,
          "conditions": "5V, VLCD=5V, VOH=4.5V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "LCD SEG sink current",
          "symbol": "IOL2",
          "kind": "electrical",
          "unit": "μA",
          "min": 250,
          "typ": 400,
          "max": null,
          "conditions": "3V, VLCD=3V, VOL=0.3V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "LCD SEG sink current",
          "symbol": "IOL2",
          "kind": "electrical",
          "unit": "μA",
          "min": 500,
          "typ": 800,
          "max": null,
          "conditions": "5V, VLCD=5V, VOL=0.5V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "LCD SEG source current",
          "symbol": "IOH2",
          "kind": "electrical",
          "unit": "μA",
          "min": -140,
          "typ": -230,
          "max": null,
          "conditions": "3V, VLCD=3V, VOH=2.7V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "LCD SEG source current",
          "symbol": "IOH2",
          "kind": "electrical",
          "unit": "μA",
          "min": -300,
          "typ": -500,
          "max": null,
          "conditions": "5V, VLCD=5V, VOH=4.5V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "LCD frame frequency",
          "symbol": "fLCD1",
          "kind": "electrical",
          "unit": "Hz",
          "min": 72,
          "typ": 80,
          "max": 88,
          "conditions": "4V, 1/4 duty, Ta=25°C",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "LCD frame frequency (160Hz setting)",
          "symbol": "fLCD2",
          "kind": "electrical",
          "unit": "Hz",
          "min": 144,
          "typ": 160,
          "max": 176,
          "conditions": "4V, 1/4 duty, Ta=25°C",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "LCD frame frequency",
          "symbol": "fLCD3",
          "kind": "electrical",
          "unit": "Hz",
          "min": 52,
          "typ": 80,
          "max": 124,
          "conditions": "4V, 1/4 duty, Ta=-40°C~85°C",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "LCD frame frequency (160Hz setting)",
          "symbol": "fLCD4",
          "kind": "electrical",
          "unit": "Hz",
          "min": 104,
          "typ": 160,
          "max": 248,
          "conditions": "4V, 1/4 duty, Ta=-40°C~85°C",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Power-on reset voltage",
          "symbol": "VPOR",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Power-on reset VDD rise rate",
          "symbol": "RRVDD",
          "kind": "timing",
          "unit": "V/ms",
          "min": 0.05,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Minimum time VDD held at VPOR",
          "symbol": "tPOR",
          "kind": "timing",
          "unit": "ms",
          "min": 10,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "SCL clock frequency",
          "symbol": "fSCL",
          "kind": "timing",
          "unit": "kHz",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "VDD=2.4V~5.5V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "SCL clock frequency",
          "symbol": "fSCL",
          "kind": "timing",
          "unit": "kHz",
          "min": null,
          "typ": null,
          "max": 400,
          "conditions": "VDD=3.0V~5.5V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Bus free time",
          "symbol": "tBUF",
          "kind": "timing",
          "unit": "μs",
          "min": 4.7,
          "typ": null,
          "max": null,
          "conditions": "VDD=2.4V~5.5V; 在此期间总线必须保持空闲直到新的传输开始",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Bus free time",
          "symbol": "tBUF",
          "kind": "timing",
          "unit": "μs",
          "min": 1.3,
          "typ": null,
          "max": null,
          "conditions": "VDD=3.0V~5.5V; 在此期间总线必须保持空闲直到新的传输开始",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "START hold time",
          "symbol": "tHD:STA",
          "kind": "timing",
          "unit": "μs",
          "min": 4,
          "typ": null,
          "max": null,
          "conditions": "VDD=2.4V~5.5V; 此周期后，产生第一个时钟脉冲",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "START hold time",
          "symbol": "tHD:STA",
          "kind": "timing",
          "unit": "μs",
          "min": 0.6,
          "typ": null,
          "max": null,
          "conditions": "VDD=3.0V~5.5V; 此周期后，产生第一个时钟脉冲",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "SCL low time",
          "symbol": "tLOW",
          "kind": "timing",
          "unit": "μs",
          "min": 4.7,
          "typ": null,
          "max": null,
          "conditions": "VDD=2.4V~5.5V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "SCL low time",
          "symbol": "tLOW",
          "kind": "timing",
          "unit": "μs",
          "min": 1.3,
          "typ": null,
          "max": null,
          "conditions": "VDD=3.0V~5.5V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "SCL high time",
          "symbol": "tHIGH",
          "kind": "timing",
          "unit": "μs",
          "min": 4,
          "typ": null,
          "max": null,
          "conditions": "VDD=2.4V~5.5V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "SCL high time",
          "symbol": "tHIGH",
          "kind": "timing",
          "unit": "μs",
          "min": 0.6,
          "typ": null,
          "max": null,
          "conditions": "VDD=3.0V~5.5V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "START setup time",
          "symbol": "tSU:STA",
          "kind": "timing",
          "unit": "μs",
          "min": 4.7,
          "typ": null,
          "max": null,
          "conditions": "VDD=2.4V~5.5V; 仅与重复发送的 START 信号有关",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "START setup time",
          "symbol": "tSU:STA",
          "kind": "timing",
          "unit": "μs",
          "min": 0.6,
          "typ": null,
          "max": null,
          "conditions": "VDD=3.0V~5.5V; 仅与重复发送的 START 信号有关",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Data hold time",
          "symbol": "tHD:DAT",
          "kind": "timing",
          "unit": "ns",
          "min": 0,
          "typ": null,
          "max": null,
          "conditions": "VDD=2.4V~5.5V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Data setup time",
          "symbol": "tSU:DAT",
          "kind": "timing",
          "unit": "ns",
          "min": 250,
          "typ": null,
          "max": null,
          "conditions": "VDD=2.4V~5.5V",
          "source_page": 8,
          "source": "datasheet"
        },
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