SN74HC164 Shift Register

{
  "schema_version": 1,
  "type": "component",
  "slug": "sn74hc164",
  "title": "SN74HC164 Shift Register",
  "brief": "8-bit serial-in, parallel-out shift register with gated serial inputs.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "logic",
    "shift-register",
    "sipo",
    "serial-to-parallel",
    "74hc",
    "ti",
    "soic-14"
  ],
  "component": {
    "mpn": "SN74HC164",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-14",
    "pin_count": 14,
    "category": "Logic",
    "subcategory": "Shift Register",
    "datasheet": "https://www.ti.com/lit/ds/symlink/sn74hc164.pdf",
    "parts": {
      "symbol": "sn74hc164.kicad_sym",
      "footprint": "sn74hc164.kicad_mod",
      "model_3d": "sn74hc164-etched.glb",
      "model_3d_plain": "sn74hc164.glb",
      "lbr": "sn74hc164.lbr",
      "model_3d_step": "sn74hc164-etched.step",
      "model_3d_step_plain": "sn74hc164.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "A",
        "type": "input",
        "description": "Gated Serial Input 1. AND-gated with input B to form the serial data fed into the first flip-flop on the rising edge of CLK. A low on either A or B inhibits new data entry and forces the first stage low on the next clock."
      },
      {
        "number": "2",
        "name": "B",
        "type": "input",
        "description": "Gated Serial Input 2. AND-gated with input A to gate serial data into the register on the rising edge of CLK."
      },
      {
        "number": "3",
        "name": "QA",
        "type": "output",
        "description": "Parallel output, bit A (first stage of the 8-bit shift register). CMOS push-pull output; ±4 mA drive at 5 V."
      },
      {
        "number": "4",
        "name": "QB",
        "type": "output",
        "description": "Parallel output, bit B (second stage of the shift register)."
      },
      {
        "number": "5",
        "name": "QC",
        "type": "output",
        "description": "Parallel output, bit C (third stage of the shift register)."
      },
      {
        "number": "6",
        "name": "QD",
        "type": "output",
        "description": "Parallel output, bit D (fourth stage of the shift register)."
      },
      {
        "number": "7",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V). Must be connected to system ground."
      },
      {
        "number": "8",
        "name": "CLK",
        "type": "input",
        "description": "Clock input. Data at the serial inputs is shifted into the register on the low-to-high transition of CLK. Maximum clock frequency 31 MHz typ at VCC = 4.5 V."
      },
      {
        "number": "9",
        "name": "CLR",
        "type": "input",
        "description": "Active-low asynchronous clear. A low level on CLR forces all eight Q outputs low regardless of the state of CLK. Overbar in datasheet indicates active-low."
      },
      {
        "number": "10",
        "name": "QE",
        "type": "output",
        "description": "Parallel output, bit E (fifth stage of the shift register)."
      },
      {
        "number": "11",
        "name": "QF",
        "type": "output",
        "description": "Parallel output, bit F (sixth stage of the shift register)."
      },
      {
        "number": "12",
        "name": "QG",
        "type": "output",
        "description": "Parallel output, bit G (seventh stage of the shift register)."
      },
      {
        "number": "13",
        "name": "QH",
        "type": "output",
        "description": "Parallel output, bit H (eighth/last stage of the shift register). Also serves as the serial data-out when cascading multiple 'HC164 devices."
      },
      {
        "number": "14",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply, 2 V to 6 V (5 V nominal). Bypass with a 0.1 uF ceramic capacitor to GND close to the pin."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/sn74hc164.pdf",
        "pages": 38,
        "sha256": "51860c45fddf000a",
        "source_tier": "mfr"
      },
      "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"
    },
    "logic": {
      "family_id": "74HC164",
      "logic_family": "74HC",
      "function_code": "164",
      "function_class": "ShiftRegister",
      "function_name": "8-Bit SIPO Shift Register",
      "manufacturer": "Texas Instruments",
      "is_specialty": false
    },
    "models_3d": [
      {
        "file": "sn74hc164.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          8.7,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "3b9a775da256c8afcc28dcddfbc2eb3f266107fe61ce8446d96f2c52b6f44a70",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sn74hc164-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "52e239d6b921a864feac8eabad888ec879cc92f580817485082f9b22a81ac603",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "8-bit serial-in parallel-out shift register",
      "Logic family": "74HC (CMOS)",
      "Serial inputs": "Two, AND-gated (A and B)",
      "Clear": "Active-low, asynchronous",
      "Supply voltage": "2 V to 6 V",
      "Max clock": "57 MHz typ at 5 V",
      "Operating temperature": "-40 C to 85 C"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "serial to parallel",
    "SIPO shift register",
    "add outputs",
    "LED driver expansion"
  ],
  "discovery_pitch": "Turn one serial data line into eight parallel outputs, chainable for more, the input-side complement of the 74HC595.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "README.md",
    "sn74hc164.kicad_sym",
    "sn74hc164.kicad_mod",
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    "sn74hc164.lbr",
    "docs/hero.png",
    "docs/sn74hc164-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
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  "variants": [
    {
      "mpn": "SN74HC164D",
      "kind": "unknown"
    },
    {
      "mpn": "SN74HC164N",
      "kind": "unknown"
    },
    {
      "mpn": "SN74HC164NS",
      "kind": "unknown"
    },
    {
      "mpn": "SN74HC164PW",
      "kind": "unknown"
    },
    {
      "mpn": "SN74HC164J",
      "kind": "unknown"
    },
    {
      "mpn": "SN74HC164W",
      "kind": "unknown"
    },
    {
      "mpn": "SN74HC164FK",
      "kind": "unknown"
    }
  ]
}