TC74HC4538AF

{
  "slug": "tc74hc4538af",
  "version": "0.1.0",
  "type": "component",
  "description": "TOSHIBA Monostable Multivibrators, SOP-16. Pinout reviewed by a person against the datasheet, KiCad symbol/footprint/3D.",
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  "component": {
    "mpn": "TC74HC4538AF",
    "manufacturer": "TOSHIBA",
    "package": "SOP-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Monostable Multivibrators",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603150844309626880",
    "parts": {
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      "lbr": "tc74hc4538af.lbr"
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    "distributor_links": {
      "lcsc": "C5381650"
    },
    "distributor_check": {
      "checked_at": "2026-10-21T19:48:14Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
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    },
    "pins": [
      {
        "number": "1",
        "name": "1T1",
        "type": "input",
        "description": "Trigger input 1 for channel 1 monostable circuit; connects to external timing network (CX, RX) for output pulse duration control."
      },
      {
        "number": "2",
        "name": "1T2",
        "type": "input",
        "description": "Trigger input 2 for channel 1 monostable circuit; connects to external timing network (CX, RX) for output pulse duration control."
      },
      {
        "number": "3",
        "name": "1CD",
        "type": "input",
        "description": "Clear/discharge input for channel 1; low level asynchronously resets Q output to low and forces IC to stand-by state."
      },
      {
        "number": "4",
        "name": "B1",
        "type": "input",
        "description": "Negative-edge trigger input for channel 1; output triggered on B1 falling edge when 1A input is low, Schmitt trigger type with tr/tf ≤ 1 μs."
      },
      {
        "number": "5",
        "name": "1A",
        "type": "input",
        "description": "Positive-edge trigger input for channel 1; output triggered on 1A rising edge when B1 input is high, Schmitt trigger type with tr/tf ≤ 1 μs."
      },
      {
        "number": "6",
        "name": "1Q",
        "type": "output",
        "description": "Q output for channel 1; pulses high during monostable period with duration twOUT = 0.70·CX·RX, 4 mA min output drive capability."
      },
      {
        "number": "7",
        "name": "Q1",
        "type": "output",
        "description": "Q̄ (inverted) output for channel 1; complementary to 1Q, pulses low during monostable period, 4 mA min output drive capability."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground; negative supply rail and return reference (0 V)."
      },
      {
        "number": "9",
        "name": "2A",
        "type": "input",
        "description": "Positive-edge trigger input for channel 2; output triggered on 2A rising edge when B2 input is high, Schmitt trigger type with tr/tf ≤ 1 μs."
      },
      {
        "number": "10",
        "name": "Q2",
        "type": "output",
        "description": "Q̄ (inverted) output for channel 2; complementary to 2Q, pulses low during monostable period, 4 mA min output drive capability."
      },
      {
        "number": "11",
        "name": "2CD",
        "type": "input",
        "description": "Clear/discharge input for channel 2; low level asynchronously resets Q output to low and forces IC to stand-by state."
      },
      {
        "number": "12",
        "name": "B2",
        "type": "input",
        "description": "Negative-edge trigger input for channel 2; output triggered on B2 falling edge when 2A input is low, Schmitt trigger type with tr/tf ≤ 1 μs."
      },
      {
        "number": "13",
        "name": "2T2",
        "type": "input",
        "description": "Trigger input 2 for channel 2 monostable circuit; connects to external timing network (CX, RX) for output pulse duration control."
      },
      {
        "number": "14",
        "name": "2T1",
        "type": "input",
        "description": "Trigger input 1 for channel 2 monostable circuit; connects to external timing network (CX, RX) for output pulse duration control."
      },
      {
        "number": "15",
        "name": "2Q",
        "type": "output",
        "description": "Q output for channel 2; pulses high during monostable period with duration twOUT = 0.70·CX·RX, 4 mA min output drive capability."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage positive rail; operating range 2 V to 6 V, 4.5 V to 6 V recommended for optimum noise immunity."
      }
    ],
    "provenance": {
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        "pages": 14,
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        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
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