74AHC138BQ

{
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  "type": "component",
  "slug": "74ahc138bq",
  "title": "74AHC138BQ",
  "brief": "Nexperia Signal Switches, Multiplexers, Decoders, DHVQFN-16-EP(2.5x3.5). 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",
    "74ahc138bq",
    "factory-2.0.0",
    "extractor-text"
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  "component": {
    "mpn": "74AHC138BQ",
    "manufacturer": "Nexperia",
    "package": "DHVQFN-16-EP(2.5x3.5)",
    "pin_count": 17,
    "category": "Logic",
    "subcategory": "Signal Switches, Multiplexers, Decoders",
    "datasheet": "https://assets.nexperia.com/documents/data-sheet/74AHC138BQ.pdf",
    "parts": {
      "symbol": "74ahc138bq.kicad_sym",
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      "model_3d": "74ahc138bq-hero.glb",
      "model_3d_plain": "74ahc138bq-etched.glb",
      "model_3d_step": "74ahc138bq-etched.step",
      "model_3d_step_plain": "74ahc138bq.step",
      "lbr": "74ahc138bq.lbr"
    },
    "distributor_links": {
      "lcsc": "C554237"
    },
    "distributor_check": {
      "checked_at": "2026-10-17T16:34:35Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "A0",
        "type": "input",
        "description": "Address input A0, the least significant binary weighted address input of the 3-to-8 decoder."
      },
      {
        "number": "2",
        "name": "A1",
        "type": "input",
        "description": "Address input A1, a binary weighted address input of the 3-to-8 decoder."
      },
      {
        "number": "3",
        "name": "A2",
        "type": "input",
        "description": "Address input A2, the most significant binary weighted address input of the 3-to-8 decoder."
      },
      {
        "number": "4",
        "name": "E1",
        "type": "input",
        "description": "Enable input E1 is active LOW; every output is HIGH unless E1 and E2 are LOW and E3 is HIGH."
      },
      {
        "number": "5",
        "name": "E2",
        "type": "input",
        "description": "Enable input E2 is active LOW; every output is HIGH unless E1 and E2 are LOW and E3 is HIGH."
      },
      {
        "number": "6",
        "name": "E3",
        "type": "input",
        "description": "Enable input E3 is active HIGH; every output is HIGH unless E1 and E2 are LOW and E3 is HIGH."
      },
      {
        "number": "7",
        "name": "Y7",
        "type": "output",
        "description": "Output Y7 is one of eight mutually exclusive outputs that are LOW when selected."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground (0 V) reference for all voltages on the device."
      },
      {
        "number": "9",
        "name": "Y6",
        "type": "output",
        "description": "Output Y6 is one of eight mutually exclusive outputs that are LOW when selected."
      },
      {
        "number": "10",
        "name": "Y5",
        "type": "output",
        "description": "Output Y5 is one of eight mutually exclusive outputs that are LOW when selected."
      },
      {
        "number": "11",
        "name": "Y4",
        "type": "output",
        "description": "Output Y4 is one of eight mutually exclusive outputs that are LOW when selected."
      },
      {
        "number": "12",
        "name": "Y3",
        "type": "output",
        "description": "Output Y3 is one of eight mutually exclusive outputs that are LOW when selected."
      },
      {
        "number": "13",
        "name": "Y2",
        "type": "output",
        "description": "Output Y2 is one of eight mutually exclusive outputs that are LOW when selected."
      },
      {
        "number": "14",
        "name": "Y1",
        "type": "output",
        "description": "Output Y1 is one of eight mutually exclusive outputs that are LOW when selected."
      },
      {
        "number": "15",
        "name": "Y0",
        "type": "output",
        "description": "Output Y0 is one of eight mutually exclusive outputs that are LOW when selected."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage; recommended range is 2.0 V to 5.5 V for 74AHC138 and 4.5 V to 5.5 V for 74AHCT138."
      },
      {
        "number": "17",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "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: Table 2 gives one pin list for SO16, TSSOP16 and DHVQFN16. Fig 5 shows the DHVQFN16 terminal layout ",
          "exposed pad 17 added from the footprint"
        ],
        "pages_sent": 17,
        "cost_usd": 0.0488,
        "at": "2026-10-17T16:30:16"
      },
      "datasheet": {
        "url": "https://assets.nexperia.com/documents/data-sheet/74AHC138BQ.pdf",
        "pages": 17,
        "sha256": "63520b5b696b050e",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 17,
        "described": 17,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
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        "units": "mm",
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        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "341e432808065681837553f017291b90e6e5e731cbd112d4d0c8f9f4e7b4153e",
        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Nexperia",
      "Package": "DHVQFN-16-EP(2.5x3.5)",
      "Category": "Logic",
      "Pins": "17"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
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          "name": "supply voltage",
          "symbol": "VCC",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 2,
          "typ": 5,
          "max": 5.5,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "input voltage",
          "symbol": "VI",
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          "typ": null,
          "max": 5.5,
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        {
          "name": "output voltage",
          "symbol": "VO",
          "kind": "recommended_operating",
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          "min": 0,
          "typ": null,
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          "conditions": "maximum printed as VCC",
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        },
        {
          "name": "ambient temperature",
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        {
          "name": "input transition rise and fall rate",
          "symbol": "t/V",
          "kind": "recommended_operating",
          "unit": "ns/V",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "VCC = 3.3 V ± 0.3 V",
          "source_page": 5,
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        },
        {
          "name": "input transition rise and fall rate",
          "symbol": "t/V",
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          "conditions": "VCC = 5.0 V ± 0.5 V",
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          "name": "supply voltage",
          "symbol": "VCC",
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          "typ": null,
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          "name": "input voltage",
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        {
          "name": "input clamping current",
          "symbol": "IIK",
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          "unit": "mA",
          "min": -20,
          "typ": null,
          "max": null,
          "conditions": "VI < 0.5 V",
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        {
          "name": "output clamping current",
          "symbol": "IOK",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 20,
          "conditions": "VO < 0.5 V or VO > VCC + 0.5 V",
          "source_page": 4,
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        {
          "name": "output current",
          "symbol": "IO",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 25,
          "conditions": "VO = 0.5 V to (VCC + 0.5 V)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "supply current",
          "symbol": "ICC",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 75,
          "conditions": "",
          "source_page": 4,
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        {
          "name": "ground current",
          "symbol": "IGND",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": 75,
          "typ": null,
          "max": null,
          "conditions": "",
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        {
          "name": "storage temperature",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "total power dissipation",
          "symbol": "Ptot",
          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 500,
          "conditions": "Tamb = 40 C to +125 C; DHVQFN16 package",
          "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 = 2.0 V; Tamb 25 C",
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        },
        {
          "name": "HIGH-level input voltage",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 2.1,
          "typ": null,
          "max": null,
          "conditions": "VCC = 3.0 V; Tamb 25 C",
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        {
          "name": "HIGH-level input voltage",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 3.85,
          "typ": null,
          "max": null,
          "conditions": "VCC = 5.5 V; Tamb 25 C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "LOW-level input voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.5,
          "conditions": "VCC = 2.0 V; Tamb 25 C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "LOW-level input voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.9,
          "conditions": "VCC = 3.0 V; Tamb 25 C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "LOW-level input voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 1.65,
          "conditions": "VCC = 5.5 V; Tamb 25 C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "HIGH-level output voltage",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 1.9,
          "typ": 2,
          "max": null,
          "conditions": "VI = VIH or VIL; IO = 50 uA; VCC = 2.0 V; Tamb 25 C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "HIGH-level output voltage",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 2.9,
          "typ": 3,
          "max": null,
          "conditions": "VI = VIH or VIL; IO = 50 uA; VCC = 3.0 V; Tamb 25 C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "HIGH-level output voltage",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 4.4,
          "typ": 4.5,
          "max": null,
          "conditions": "VI = VIH or VIL; IO = 50 uA; VCC = 4.5 V; Tamb 25 C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "HIGH-level output voltage",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 2.58,
          "typ": null,
          "max": null,
          "conditions": "VI = VIH or VIL; IO = 4.0 mA; VCC = 3.0 V; Tamb 25 C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "HIGH-level output voltage",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 3.94,
          "typ": null,
          "max": null,
          "conditions": "VI = VIH or VIL; IO = 8.0 mA; VCC = 4.5 V; Tamb 25 C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "LOW-level output voltage",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0,
          "max": 0.1,
          "conditions": "VI = VIH or VIL; IO = 50 uA; VCC = 2.0 V; Tamb 25 C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "LOW-level output voltage",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.36,
          "conditions": "VI = VIH or VIL; IO = 4.0 mA; VCC = 3.0 V; Tamb 25 C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "input leakage current",
          "symbol": "II",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": null,
          "max": 0.1,
          "conditions": "VI = 5.5 V or GND; VCC = 0 V or 5.5 V; Tamb 25 C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "supply current",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": null,
          "max": 4,
          "conditions": "VI = VCC or GND; IO = 0 A; VCC = 5.5 V; Tamb 25 C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "input capacitance",
          "symbol": "CI",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": 3,
          "max": 10,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
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        {
          "name": "HIGH-level output voltage",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 1.9,
          "typ": null,
          "max": null,
          "conditions": "40 C to +125 C; VI = VIH or VIL; IO = 50 uA; VCC = 2.0 V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "HIGH-level output voltage",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 2.9,
          "typ": null,
          "max": null,
          "conditions": "40 C to +125 C; VI = VIH or VIL; IO = 50 uA; VCC = 3.0 V",
          "source_page": 5,
          "source": "datasheet"
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        {
          "name": "HIGH-level output voltage",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 4.4,
          "typ": null,
          "max": null,
          "conditions": "40 C to +125 C; VI = VIH or VIL; IO = 50 uA; VCC = 4.5 V",
          "source_page": 5,
          "source": "datasheet"
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        {
          "name": "HIGH-level output voltage",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
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          "typ": null,
          "max": null,
          "conditions": "40 C to +125 C; VI = VIH or VIL; IO = 4.0 mA; VCC = 3.0 V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "HIGH-level output voltage",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 3.7,
          "typ": null,
          "max": null,
          "conditions": "40 C to +125 C; VI = VIH or VIL; IO = 8.0 mA; VCC = 4.5 V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "LOW-level output voltage",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.1,
          "conditions": "40 C to +125 C; VI = VIH or VIL; IO = 50 uA; VCC = 2.0 V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "LOW-level output voltage",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.55,
          "conditions": "40 C to +125 C; VI = VIH or VIL; IO = 4.0 mA; VCC = 3.0 V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "input leakage current",
          "symbol": "II",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": null,
          "max": 2,
          "conditions": "40 C to +125 C; VI = 5.5 V or GND; VCC = 0 V or 5.5 V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "supply current",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": null,
          "max": 80,
          "conditions": "40 C to +125 C; VI = VCC or GND; IO = 0 A; VCC = 5.5 V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "propagation delay An to Yn",
          "symbol": "tpd",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 6,
          "max": 11.4,
          "conditions": "An to Yn; see Figure 6; VCC = 3.0 V to 3.6 V; CL = 15 pF; 25 C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "propagation delay An to Yn",
          "symbol": "tpd",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 8.6,
          "max": 15.8,
          "conditions": "An to Yn; see Figure 6; VCC = 3.0 V to 3.6 V; CL = 50 pF; 25 C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "propagation delay An to Yn",
          "symbol": "tpd",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 4.4,
          "max": 8.1,
          "conditions": "An to Yn; see Figure 6; VCC = 4.5 V to 5.5 V; CL = 15 pF; 25 C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "propagation delay An to Yn",
          "symbol": "tpd",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 6.3,
          "max": 10.1,
          "conditions": "An to Yn; see Figure 6; VCC = 4.5 V to 5.5 V; CL = 50 pF; 25 C",
          "source_page": 7,
          "source": "datasheet"
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