SN74HC595

{
  "schema_version": 1,
  "type": "component",
  "slug": "sn74hc595",
  "title": "SN74HC595",
  "brief": "TI 8-bit serial-in parallel-out shift register, SOIC-16. 2-6 V, 3-state outputs, serial cascade out. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "logic",
    "shift-register",
    "74hc",
    "soic-16",
    "texas-instruments"
  ],
  "component": {
    "mpn": "SN74HC595",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-16",
    "pin_count": 16,
    "category": "Logic IC",
    "subcategory": "Shift register",
    "datasheet": "https://www.ti.com/lit/ds/symlink/sn74hc595.pdf",
    "parts": {
      "symbol": "sn74hc595.kicad_sym",
      "footprint": "sn74hc595.kicad_mod",
      "model_3d": "sn74hc595-etched.glb",
      "model_3d_plain": "sn74hc595.glb",
      "lbr": "sn74hc595.lbr",
      "model_3d_step": "sn74hc595-etched.step",
      "model_3d_step_plain": "sn74hc595.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "QB",
        "type": "tri_state",
        "description": "Parallel 3-state output bit B from the 8-bit storage register. Drives up to 15 LSTTL loads (±6 mA typical at VCC = 4.5 V). Placed in high-impedance when OE is high."
      },
      {
        "number": "2",
        "name": "QC",
        "type": "tri_state",
        "description": "Parallel 3-state output bit C from the 8-bit storage register. Placed in high-impedance when OE is high."
      },
      {
        "number": "3",
        "name": "QD",
        "type": "tri_state",
        "description": "Parallel 3-state output bit D from the 8-bit storage register. Placed in high-impedance when OE is high."
      },
      {
        "number": "4",
        "name": "QE",
        "type": "tri_state",
        "description": "Parallel 3-state output bit E from the 8-bit storage register. Placed in high-impedance when OE is high."
      },
      {
        "number": "5",
        "name": "QF",
        "type": "tri_state",
        "description": "Parallel 3-state output bit F from the 8-bit storage register. Placed in high-impedance when OE is high."
      },
      {
        "number": "6",
        "name": "QG",
        "type": "tri_state",
        "description": "Parallel 3-state output bit G from the 8-bit storage register. Placed in high-impedance when OE is high."
      },
      {
        "number": "7",
        "name": "QH",
        "type": "tri_state",
        "description": "Parallel 3-state output bit H from the 8-bit storage register. Placed in high-impedance when OE is high."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V) for the device."
      },
      {
        "number": "9",
        "name": "QH'",
        "type": "output",
        "description": "Serial data output from the internal shift register (taken from the last shift stage, QH). Used for cascading multiple SN74HC595 devices. Not affected by OE (always driven)."
      },
      {
        "number": "10",
        "name": "SRCLR",
        "type": "input",
        "description": "Active-low shift-register clear. When low, asynchronously clears the 8-bit shift register; does not clear the storage register."
      },
      {
        "number": "11",
        "name": "SRCLK",
        "type": "input",
        "description": "Shift-register clock input. On the rising edge, data at SER is shifted one position through QA'..QH' of the shift register."
      },
      {
        "number": "12",
        "name": "RCLK",
        "type": "input",
        "description": "Storage-register (latch) clock input. On the rising edge, the shift-register contents are transferred in parallel to the storage register, updating outputs QA-QH."
      },
      {
        "number": "13",
        "name": "OE",
        "type": "input",
        "description": "Active-low output enable. When low, the QA-QH parallel outputs are driven; when high, they enter the high-impedance state. Does not affect the serial cascade output QH'."
      },
      {
        "number": "14",
        "name": "SER",
        "type": "input",
        "description": "Serial data input to the shift register. Sampled on the rising edge of SRCLK; shifted into stage A."
      },
      {
        "number": "15",
        "name": "QA",
        "type": "tri_state",
        "description": "Parallel 3-state output bit A from the 8-bit storage register. Placed in high-impedance when OE is high."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply, 2 V to 6 V (recommended). Absolute maximum 7 V."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/sn74hc595.pdf",
        "pages": 41,
        "sha256": "215816945704e561",
        "source_tier": "mfr"
      },
      "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"
    },
    "logic": {
      "family_id": "74HC595",
      "logic_family": "74HC",
      "function_code": "595",
      "function_class": "ShiftRegister",
      "function_name": "8-Bit SIPO Shift Register with Output Latch",
      "manufacturer": "Texas Instruments",
      "is_specialty": false
    },
    "models_3d": [
      {
        "file": "sn74hc595.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          9.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sn74hc595-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          9.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "0bc20cfbdf1f502a2d7c3a62d2b2c93b1b0cf48aca1b86ff7b0774d01c64eeb8",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "8-bit shift register (SIPO)",
      "Logic family": "HC (high-speed CMOS)",
      "Supply voltage (VCC)": "2-6 V (7 V abs max)",
      "Outputs": "8 parallel 3-state (QA-QH) + serial QH'",
      "Output drive": "±6 mA per output",
      "Clocking": "Separate SRCLK (shift) + RCLK (latch)",
      "Reset": "Direct SRCLR (active low), OE tri-state",
      "Package": "SOIC-16",
      "Body (L×W×H)": "9.9 × 3.9 × 1.75 mm"
    }
  },
  "discovery_triggers": [
    "sn74hc595",
    "74hc595",
    "8-bit shift register",
    "serial to parallel"
  ],
  "discovery_pitch": "SN74HC595 8-bit serial-in parallel-out shift register (SOIC-16) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "sn74hc595.kicad_sym",
    "sn74hc595.kicad_mod",
    "sn74hc595.glb",
    "sn74hc595.lbr",
    "docs/hero.png",
    "docs/sn74hc595-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "sn74hc595-etched.step"
  ],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "variants": [
    {
      "mpn": "SN74HC595D (SOIC-16, tube)",
      "kind": "packaging"
    },
    {
      "mpn": "SN74HC595DR (SOIC-16, tape & reel)",
      "kind": "packaging"
    }
  ]
}