CD74HC161E

{
  "schema_version": 1,
  "type": "component",
  "slug": "cd74hc161e",
  "title": "CD74HC161E",
  "brief": "Texas Instruments Counters, Dividers, PDIP-16. 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",
    "logic",
    "cd74hc161e",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "CD74HC161E",
    "manufacturer": "Texas Instruments",
    "package": "PDIP-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Counters, Dividers",
    "datasheet": "https://www.ti.com/cn/lit/gpn/cd74hc161",
    "parts": {
      "symbol": "cd74hc161e.kicad_sym",
      "footprint": "cd74hc161e.kicad_mod",
      "model_3d": "cd74hc161e-hero.glb",
      "model_3d_plain": "cd74hc161e-etched.glb",
      "model_3d_step": "cd74hc161e-etched.step",
      "model_3d_step_plain": "cd74hc161e.step",
      "lbr": "cd74hc161e.lbr"
    },
    "distributor_links": {
      "lcsc": "C1523311",
      "digikey": "296-33032-5-ND",
      "mouser": "595-CD74HC161E"
    },
    "distributor_check": {
      "checked_at": "2026-10-16T16:58:40Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-33032-5-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-CD74HC161E",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "MR",
        "type": "input",
        "description": "Active-low master reset; a low level resets all Q outputs to low asynchronously on the '161, regardless of clock or enable levels."
      },
      {
        "number": "2",
        "name": "CP",
        "type": "input",
        "description": "Clock input; counting and parallel presetting occur on the negative-to-positive (low-to-high) clock transition."
      },
      {
        "number": "3",
        "name": "P0",
        "type": "input",
        "description": "Parallel data input bit 0, loaded into the counter on the clock edge when SPE is low, subject to the SPE setup and hold requirements."
      },
      {
        "number": "4",
        "name": "P1",
        "type": "input",
        "description": "Parallel data input bit 1, loaded into the counter on the clock edge when SPE is low, subject to the SPE setup and hold requirements."
      },
      {
        "number": "5",
        "name": "P2",
        "type": "input",
        "description": "Parallel data input bit 2, loaded into the counter on the clock edge when SPE is low, subject to the SPE setup and hold requirements."
      },
      {
        "number": "6",
        "name": "P3",
        "type": "input",
        "description": "Parallel data input bit 3, loaded into the counter on the clock edge when SPE is low, subject to the SPE setup and hold requirements."
      },
      {
        "number": "7",
        "name": "PE",
        "type": "input",
        "description": "Count enable (parallel enable); both PE and TE must be high for the counter to count."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference pin for the device."
      },
      {
        "number": "9",
        "name": "SPE",
        "type": "input",
        "description": "Synchronous parallel enable; a low level disables counting and allows data at P0 to P3 to be loaded on the clock edge, provided SPE setup and hold times are met."
      },
      {
        "number": "10",
        "name": "TE",
        "type": "input",
        "description": "Count enable (terminal count enable); gated with the Q outputs so that TC goes high for one clock period at maximum count when TE is high, used for cascading."
      },
      {
        "number": "11",
        "name": "Q3",
        "type": "output",
        "description": "Counter output bit 3 (most significant bit)."
      },
      {
        "number": "12",
        "name": "Q2",
        "type": "output",
        "description": "Counter output bit 2."
      },
      {
        "number": "13",
        "name": "Q1",
        "type": "output",
        "description": "Counter output bit 1."
      },
      {
        "number": "14",
        "name": "Q0",
        "type": "output",
        "description": "Counter output bit 0 (least significant bit)."
      },
      {
        "number": "15",
        "name": "TC",
        "type": "output",
        "description": "Terminal count output; goes high for one clock period when TE is high and the counter is at terminal count (HHHH), enabling the next cascaded stage."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply; HC types operate from 2 V to 6 V."
      }
    ],
    "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 pinout page gives the pin numbers and signal names as separate, unpaired text lists. Pin assignm; The datasheet gives no explicit pin description for GND; the description is a generic ground referen; The datasheet lists the CD74HC161E as a 2 V to 6 V HC-type part. Pin types were assigned using KiCad"
        ],
        "pages_sent": 20,
        "cost_usd": 0.0899,
        "at": "2026-10-16T16:58:23"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/cd74hc161",
        "pages": 20,
        "sha256": "cfdc63695252f714",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "cd74hc161e.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          7.874,
          19.177,
          6.98
        ],
        "zmin_mm": -3.3,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "17a30b1f0ab3fd5384a1231e3c63c394888d5b952c542a8c189e023ed3467464",
        "checked": "2026-10-16",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "cd74hc161e-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          7.874,
          19.177,
          6.98
        ],
        "zmin_mm": -3.3,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "2268717fd225ada06fc0988e54e41aade5fd3d9ef9bbbce9f41ee209729f32a2",
        "checked": "2026-10-16",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "PDIP-16",
      "Category": "Logic",
      "Pins": "16"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "cfdc63695252f7148384e6488afc1a420f6fea3ef49fe6672f45600cda06800d",
      "rows": [
        {
          "name": "DC Supply Voltage",
          "symbol": "VCC",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": 7,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "DC Input Diode Current",
          "symbol": "IIK",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -20,
          "typ": null,
          "max": 20,
          "conditions": "For VI < -0.5V or VI > VCC + 0.5V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "DC Output Diode Current",
          "symbol": "IOK",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -20,
          "typ": null,
          "max": 20,
          "conditions": "For VO < -0.5V or VO > VCC + 0.5V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "DC Drain Current, per Output",
          "symbol": "IO",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -25,
          "typ": null,
          "max": 25,
          "conditions": "For -0.5V < VO < VCC + 0.5V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "DC Output Source or Sink Current per Output Pin",
          "symbol": "IO",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -25,
          "typ": null,
          "max": 25,
          "conditions": "For VO > -0.5V or VO < VCC + 0.5V (as printed)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "DC VCC or Ground Current",
          "symbol": "ICC",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -50,
          "typ": null,
          "max": 50,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Maximum Storage Temperature Range",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Maximum Lead Temperature (Soldering)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 300,
          "conditions": "Soldering 10s (SOIC - lead tips only)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Maximum Junction Temperature",
          "symbol": "",
          "kind": "thermal",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Temperature Range",
          "symbol": "TA",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -55,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Supply Voltage Range, HC Types",
          "symbol": "VCC",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 2,
          "typ": null,
          "max": 6,
          "conditions": "HC types",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "DC Input or Output Voltage",
          "symbol": "VI, VO",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 0,
          "typ": null,
          "max": null,
          "conditions": "Maximum printed as VCC",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Input Rise and Fall Time",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 1000,
          "conditions": "VCC = 2V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Input Rise and Fall Time",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 500,
          "conditions": "VCC = 4.5V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Input Rise and Fall Time",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 400,
          "conditions": "VCC = 6V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Thermal Resistance Junction-to-Ambient, E (PDIP) Package",
          "symbol": "θJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 67,
          "max": null,
          "conditions": "Typical, per JESD 51-7 (Note 4)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "High Level Input Voltage",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 1.5,
          "typ": null,
          "max": null,
          "conditions": "VCC = 2V; min over -55 to 125°C",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "High Level Input Voltage",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 3.15,
          "typ": null,
          "max": null,
          "conditions": "VCC = 4.5V; min over -55 to 125°C",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "High Level Input Voltage",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 4.2,
          "typ": null,
          "max": null,
          "conditions": "VCC = 6V; min over -55 to 125°C",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Low Level Input Voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.5,
          "conditions": "VCC = 2V; max over -55 to 125°C",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Low Level Input Voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 1.35,
          "conditions": "VCC = 4.5V; max over -55 to 125°C",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Low Level Input Voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 1.8,
          "conditions": "VCC = 6V; max over -55 to 125°C",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "High Level Output Voltage, CMOS Loads",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 1.9,
          "typ": null,
          "max": null,
          "conditions": "VI = VIH or VIL, IO = -0.02 mA, VCC = 2V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "High Level Output Voltage, CMOS Loads",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 4.4,
          "typ": null,
          "max": null,
          "conditions": "VI = VIH or VIL, IO = -0.02 mA, VCC = 4.5V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "High Level Output Voltage, CMOS Loads",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 5.9,
          "typ": null,
          "max": null,
          "conditions": "VI = VIH or VIL, IO = -0.02 mA, VCC = 6V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "High Level Output Voltage, TTL Loads",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 3.7,
          "typ": null,
          "max": null,
          "conditions": "IO = -4 mA, VCC = 4.5V; min over -55 to 125°C",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "High Level Output Voltage, TTL Loads",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 5.2,
          "typ": null,
          "max": null,
          "conditions": "IO = -5.2 mA, VCC = 6V; min over -55 to 125°C",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Low Level Output Voltage, CMOS Loads",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.1,
          "conditions": "VI = VIH or VIL, IO = 0.02 mA, VCC = 2V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Low Level Output Voltage, TTL Loads",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.4,
          "conditions": "IO = 4 mA, VCC = 4.5V; max over -55 to 125°C",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Input Leakage Current",
          "symbol": "II",
          "kind": "electrical",
          "unit": "µA",
          "min": -1,
          "typ": null,
          "max": 1,
          "conditions": "VI = VCC or GND, VCC = 6V; over -55 to 125°C",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Quiescent Device Current",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 160,
          "conditions": "VI = VCC or GND, IO = 0, VCC = 6V; over -55 to 125°C",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Propagation Delay CP to TC",
          "symbol": "tPHL, tPLH",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 280,
          "conditions": "CL = 50pF, VCC = 2V; over -55 to 125°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Propagation Delay CP to TC",
          "symbol": "tPHL, tPLH",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 56,
          "conditions": "CL = 50pF, VCC = 4.5V; over -55 to 125°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Propagation Delay CP to TC",
          "symbol": "tPHL, tPLH",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 48,
          "conditions": "CL = 50pF, VCC = 6V; over -55 to 125°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Propagation Delay CP to Qn",
          "symbol": "tPHL, tPLH",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 280,
          "conditions": "CL = 50pF, VCC = 2V; over -55 to 125°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Propagation Delay CP to Qn",
          "symbol": "tPHL, tPLH",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 56,
          "conditions": "CL = 50pF, VCC = 4.5V; over -55 to 125°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Propagation Delay CP to Qn",
          "symbol": "tPHL, tPLH",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 48,
          "conditions": "CL = 50pF, VCC = 6V; over -55 to 125°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Propagation Delay TE to TC",
          "symbol": "tPHL, tPLH",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 180,
          "conditions": "CL = 50pF, VCC = 2V; over -55 to 125°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Propagation Delay TE to TC",
          "symbol": "tPHL, tPLH",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 36,
          "conditions": "CL = 50pF, VCC = 4.5V; over -55 to 125°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Propagation Delay TE to TC",
          "symbol": "tPHL, tPLH",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 31,
          "conditions": "CL = 50pF, VCC = 6V; over -55 to 125°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Propagation Delay MR to Qn (161)",
          "symbol": "tPHL",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 315,
          "conditions": "CL = 50pF, VCC = 2V; over -55 to 125°C",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Propagation Delay MR to Qn (161)",
          "symbol": "tPHL",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 63,
          "conditions": "CL = 50pF, VCC = 4.5V; over -55 to 125°C",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Propagation Delay MR to Qn (161)",
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          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 54,
          "conditions": "CL = 50pF, VCC = 6V; over -55 to 125°C",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Output Transition Time",
          "symbol": "tTHL, tTLH",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 110,
          "conditions": "CL = 50pF, VCC = 2V; over -55 to 125°C",
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