HT7135ARWZ

{
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  "type": "component",
  "slug": "ht7135arwz",
  "title": "HT7135ARWZ",
  "brief": "HTCSEMI Analog To Digital Converters (ADC), SOP-28-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "data acquisition",
    "ht7135arwz",
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  "component": {
    "mpn": "HT7135ARWZ",
    "manufacturer": "HTCSEMI",
    "package": "SOP-28-300mil",
    "pin_count": 28,
    "category": "Data Acquisition",
    "subcategory": "Analog To Digital Converters (ADC)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588944595791462400",
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    "distributor_links": {
      "lcsc": "C2834488"
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    "distributor_check": {
      "checked_at": "2026-10-19T06:46:41Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
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      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VCC–",
        "type": "power_in",
        "description": "Negative supply, recommended -3 V to -8 V (-5 V nominal) relative to ground."
      },
      {
        "number": "2",
        "name": "REF",
        "type": "input",
        "description": "Reference voltage input, positive with respect to ANLG COMMON, with Vref recommended at 1 V."
      },
      {
        "number": "3",
        "name": "ANLG COMMON",
        "type": "passive",
        "description": "Analog common, connected to internal IN- during auto-zero, deintegrate and zero-integrator phases, and tied to the same point as IN- where possible."
      },
      {
        "number": "4",
        "name": "INT OUT",
        "type": "output",
        "description": "Integrator output, connected to the integrating capacitor CINT (nominally 0.47 µF) and the rollover-correction diode."
      },
      {
        "number": "5",
        "name": "AUTO ZERO",
        "type": "passive",
        "description": "Auto-zero capacitor connection (typically 1 µF) that compensates offset voltages of the buffer, integrator and comparator."
      },
      {
        "number": "6",
        "name": "BUFF OUT",
        "type": "output",
        "description": "Buffer amplifier output, connected to the integrating resistor RINT."
      },
      {
        "number": "7",
        "name": "Cref–",
        "type": "passive",
        "description": "Reference capacitor negative terminal (typically 1 µF)."
      },
      {
        "number": "8",
        "name": "Cref+",
        "type": "passive",
        "description": "Reference capacitor positive terminal (typically 1 µF)."
      },
      {
        "number": "9",
        "name": "IN–",
        "type": "input",
        "description": "Differential analog input low, with input range from VCC- +1 V to VCC+ -0.5 V and typical leakage 1 pA."
      },
      {
        "number": "10",
        "name": "IN+",
        "type": "input",
        "description": "Differential analog input high, with input range from VCC- +1 V to VCC+ -0.5 V and typical leakage 1 pA."
      },
      {
        "number": "11",
        "name": "VCC+",
        "type": "power_in",
        "description": "Positive supply, 4 V to 6 V (5 V nominal)."
      },
      {
        "number": "12",
        "name": "D5",
        "type": "output",
        "description": "Digit-drive output for the most significant digit, goes high for 200 clock pulses in the scan sequence."
      },
      {
        "number": "13",
        "name": "B1",
        "type": "output",
        "description": "Multiplexed BCD output bit 1 (LSB), TTL-compatible."
      },
      {
        "number": "14",
        "name": "B2",
        "type": "output",
        "description": "Multiplexed BCD output bit 2, TTL-compatible."
      },
      {
        "number": "15",
        "name": "B4",
        "type": "output",
        "description": "Multiplexed BCD output bit 4, TTL-compatible."
      },
      {
        "number": "16",
        "name": "B8",
        "type": "output",
        "description": "Multiplexed BCD output bit 8 (MSB), TTL-compatible."
      },
      {
        "number": "17",
        "name": "D4",
        "type": "output",
        "description": "Digit-drive output for the second digit, goes high for 200 clock pulses in the scan sequence."
      },
      {
        "number": "18",
        "name": "D3",
        "type": "output",
        "description": "Digit-drive output for the third digit, goes high for 200 clock pulses in the scan sequence."
      },
      {
        "number": "19",
        "name": "D2",
        "type": "output",
        "description": "Digit-drive output for the fourth digit, goes high for 200 clock pulses in the scan sequence."
      },
      {
        "number": "20",
        "name": "D1",
        "type": "output",
        "description": "Digit-drive output for the least significant digit, goes high for 200 clock pulses in the scan sequence."
      },
      {
        "number": "21",
        "name": "BUSY",
        "type": "output",
        "description": "Goes high at the start of signal integrate and stays high until the first clock pulse after zero crossing, or until end of the cycle on over-range."
      },
      {
        "number": "22",
        "name": "CLK",
        "type": "input",
        "description": "Clock input from 0 V to VCC+, with VIH 2.8 V min, VIL 0.8 V max and operating frequency up to 2 MHz."
      },
      {
        "number": "23",
        "name": "POLARITY",
        "type": "output",
        "description": "Polarity output, high for a positive input signal, updated at the start of each deintegrate phase."
      },
      {
        "number": "24",
        "name": "DGTL GND",
        "type": "power_in",
        "description": "Digital ground, whose return currents should not be sent to the analog ground line."
      },
      {
        "number": "25",
        "name": "RUN/HOLD",
        "type": "input",
        "description": "When high or open, measurements run continuously every 40,002 clock pulses; when low, the reading is held, and a positive pulse over 300 ns starts a new cycle."
      },
      {
        "number": "26",
        "name": "STROBE",
        "type": "output",
        "description": "Negative-going pulses transfer BCD data to external latches, UARTs or microprocessors, with the pulse low for 1/2 clock width."
      },
      {
        "number": "27",
        "name": "OVER RANGE",
        "type": "output",
        "description": "Goes high after BUSY goes low at the end of a cycle when an over-range condition occurs."
      },
      {
        "number": "28",
        "name": "UNDER RANGE",
        "type": "output",
        "description": "Goes high at the end of BUSY when the conversion is at or below 9% of full scale (count of 1800)."
      }
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          "10/28 pins cited to the wrong page (name found elsewhere): ['7:Cref–@p9', '8:Cref+@p9', '13:B1@p9', '16:OVER RANGE@p8']"
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        "at": "2026-10-19T06:44:23"
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  "metadata": {
    "specs": {
      "Manufacturer": "HTCSEMI",
      "Package": "SOP-28-300mil",
      "Category": "Data Acquisition",
      "Pins": "28"
    },
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          "name": "Supply voltage, VCC+",
          "symbol": "VCC+",
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          "unit": "V",
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          "max": 6,
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          "name": "Supply voltage, VCC–",
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          "max": -8,
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          "name": "High-level input voltage, CLK, RUN/HOLD",
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        {
          "name": "Maximum operating frequency, fclock",
          "symbol": "fclock",
          "kind": "recommended_operating",
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        {
          "name": "Storage temperature range, Tstg",
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          "unit": "°C",
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          "typ": null,
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        {
          "name": "High level output voltage D1-D5,B1,B2,B4,B8",
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          "typ": null,
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          "conditions": "IO = –1 mA",
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          "name": "High-level output voltage, other outputs",
          "symbol": "VOH",
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          "conditions": "IO = –10 µA",
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          "name": "Zero-reading temperature coefficient of output voltage",
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          "unit": "µA",
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          "conditions": "VI = 5 V, 0°C ≤ TA ≤ 70°C",
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          "conditions": "VI = 0 V, 0°C ≤ TA ≤ 70°C",
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          "conditions": "fclock = 0, TA = 25°C",
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          "conditions": "fclock = 0, TA = 25°C",
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          "name": "Negative supply current",
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          "conditions": "VID = 2 V, 0°C ≤ TA ≤ 70°C",
          "source_page": 4,
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          "name": "Full-scale symmetry error (rollover error)",
          "symbol": "EFS",
          "kind": "electrical",
          "unit": "count",
          "min": null,
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          "max": 1,
          "conditions": "VID = ±2 V",
          "source_page": 4,
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        {
          "name": "Display reading with 0-V input",
          "symbol": "",
          "kind": "electrical",
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          "conditions": "VID = 0, 0°C ≤ TA ≤ 70°C",
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          "name": "Display reading in ratiometric operation",
          "symbol": "",
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          "min": 0.9998,
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          "name": "Display reading in ratiometric operation",
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