TC74HC4538AF

{
  "schema_version": 1,
  "type": "component",
  "slug": "tc74hc4538af",
  "title": "TC74HC4538AF",
  "brief": "TOSHIBA Monostable Multivibrators, SOP-16. Pinout reviewed by a person against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "logic",
    "tc74hc4538af",
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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": {
      "symbol": "tc74hc4538af.kicad_sym",
      "footprint": "tc74hc4538af.kicad_mod",
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      "model_3d_plain": "tc74hc4538af-etched.glb",
      "model_3d_step": "tc74hc4538af-etched.step",
      "model_3d_step_plain": "tc74hc4538af.step",
      "lbr": "tc74hc4538af.lbr"
    },
    "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": {
        "pn": null,
        "status": "quota"
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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,
        "sha256": "a45087ec6b1bcbd9",
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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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    },
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "TOSHIBA",
      "Package": "SOP-16",
      "Category": "Logic",
      "Pins": "16"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
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      "rows": [
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          "name": "Supply voltage",
          "symbol": "VCC",
          "kind": "absolute_maximum",
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          "min": -0.5,
          "typ": null,
          "max": 7,
          "conditions": "",
          "source_page": 6,
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        },
        {
          "name": "DC input voltage",
          "symbol": "VIN",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": null,
          "conditions": "Printed as -0.5 to VCC + 0.5",
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        },
        {
          "name": "DC output voltage",
          "symbol": "VOUT",
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        {
          "name": "Input diode current",
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        {
          "name": "Output diode current",
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          "name": "DC output current",
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        {
          "name": "DC VCC/ground current",
          "symbol": "ICC",
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          "min": -50,
          "typ": null,
          "max": 50,
          "conditions": "",
          "source_page": 6,
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        },
        {
          "name": "Power dissipation",
          "symbol": "PD",
          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 180,
          "conditions": "SOP/TSSOP package (DIP: 500 mW, Note 1)",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature",
          "symbol": "Tstg",
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          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 6,
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        {
          "name": "Supply voltage",
          "symbol": "VCC",
          "kind": "recommended_operating",
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          "min": 2,
          "typ": null,
          "max": 6,
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        {
          "name": "Input voltage",
          "symbol": "VIN",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 0,
          "typ": null,
          "max": null,
          "conditions": "Printed as 0 to VCC",
          "source_page": 6,
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        {
          "name": "Output voltage",
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          "kind": "recommended_operating",
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          "min": 0,
          "typ": null,
          "max": null,
          "conditions": "Printed as 0 to VCC",
          "source_page": 6,
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        },
        {
          "name": "Operating temperature",
          "symbol": "Topr",
          "kind": "recommended_operating",
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          "min": -40,
          "typ": null,
          "max": 85,
          "conditions": "",
          "source_page": 6,
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        },
        {
          "name": "Input rise and fall time (CD only)",
          "symbol": "tr, tf",
          "kind": "recommended_operating",
          "unit": "ns",
          "min": 0,
          "typ": null,
          "max": 1000,
          "conditions": "VCC = 2.0 V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Input rise and fall time (CD only)",
          "symbol": "tr, tf",
          "kind": "recommended_operating",
          "unit": "ns",
          "min": 0,
          "typ": null,
          "max": 500,
          "conditions": "VCC = 4.5 V",
          "source_page": 6,
          "source": "datasheet"
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        {
          "name": "Input rise and fall time (CD only)",
          "symbol": "tr, tf",
          "kind": "recommended_operating",
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          "typ": null,
          "max": 400,
          "conditions": "VCC = 6.5 V (as printed)",
          "source_page": 6,
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        },
        {
          "name": "External resistor",
          "symbol": "RX",
          "kind": "recommended_operating",
          "unit": "kΩ",
          "min": 5,
          "typ": null,
          "max": null,
          "conditions": "VCC = 2.0 V (Note 1)",
          "source_page": 6,
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        },
        {
          "name": "External resistor",
          "symbol": "RX",
          "kind": "recommended_operating",
          "unit": "kΩ",
          "min": 1,
          "typ": null,
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          "conditions": "VCC ≥ 3.0 V (Note 1)",
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        {
          "name": "High-level input voltage",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 1.5,
          "typ": null,
          "max": null,
          "conditions": "VCC = 2.0 V; Ta = -40 to 85°C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "High-level input voltage",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 3.15,
          "typ": null,
          "max": null,
          "conditions": "VCC = 4.5 V; Ta = -40 to 85°C",
          "source_page": 7,
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        {
          "name": "High-level input voltage",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 4.2,
          "typ": null,
          "max": null,
          "conditions": "VCC = 6.0 V; Ta = -40 to 85°C",
          "source_page": 7,
          "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; Ta = -40 to 85°C",
          "source_page": 7,
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        {
          "name": "Low-level input voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
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          "max": 1.35,
          "conditions": "VCC = 4.5 V; Ta = -40 to 85°C",
          "source_page": 7,
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        },
        {
          "name": "Low-level input voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 1.8,
          "conditions": "VCC = 6.0 V; Ta = -40 to 85°C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "High-level output voltage (Q, Q̄)",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 1.9,
          "typ": null,
          "max": null,
          "conditions": "VIN = VIH or VIL; IOH = -20 μA; VCC = 2.0 V; Ta = -40 to 85°C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "High-level output voltage (Q, Q̄)",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 4.4,
          "typ": null,
          "max": null,
          "conditions": "VIN = VIH or VIL; IOH = -20 μA; VCC = 4.5 V; Ta = -40 to 85°C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "High-level output voltage (Q, Q̄)",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 5.9,
          "typ": null,
          "max": null,
          "conditions": "VIN = VIH or VIL; IOH = -20 μA; VCC = 6.0 V; Ta = -40 to 85°C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "High-level output voltage (Q, Q̄)",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 4.13,
          "typ": null,
          "max": null,
          "conditions": "VIN = VIH or VIL; IOH = -4 mA; VCC = 4.5 V; Ta = -40 to 85°C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "High-level output voltage (Q, Q̄)",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 5.63,
          "typ": null,
          "max": null,
          "conditions": "VIN = VIH or VIL; IOH = -5.2 mA; VCC = 6.0 V; Ta = -40 to 85°C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Low-level output voltage (Q, Q̄)",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.1,
          "conditions": "VIN = VIH or VIL; IOL = 20 μA; VCC = 2.0 V; Ta = -40 to 85°C",
          "source_page": 7,
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        {
          "name": "Low-level output voltage (Q, Q̄)",
          "symbol": "VOL",
          "kind": "electrical",
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          "min": null,
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          "max": 0.33,
          "conditions": "VIN = VIH or VIL; IOL = 4 mA; VCC = 4.5 V; Ta = -40 to 85°C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Input leakage current",
          "symbol": "IIN",
          "kind": "electrical",
          "unit": "μA",
          "min": -1,
          "typ": null,
          "max": 1,
          "conditions": "VIN = VCC or GND; VCC = 6.0 V; Ta = -40 to 85°C",
          "source_page": 7,
          "source": "datasheet"
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        {
          "name": "T2 terminal input leakage current",
          "symbol": "IIN",
          "kind": "electrical",
          "unit": "μA",
          "min": -5,
          "typ": null,
          "max": 5,
          "conditions": "VIN = VCC or GND; VCC = 6.0 V; Ta = -40 to 85°C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Quiescent supply current",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": null,
          "max": 40,
          "conditions": "VIN = VCC or GND; VCC = 6.0 V; Ta = -40 to 85°C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Active-state supply current (per circuit)",
          "symbol": "ICC'",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": null,
          "max": 160,
          "conditions": "VIN = VCC or GND; RX/CX = 0.5 VCC; VCC = 2.0 V; Ta = -40 to 85°C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Active-state supply current (per circuit)",
          "symbol": "ICC'",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": null,
          "max": 400,
          "conditions": "VIN = VCC or GND; RX/CX = 0.5 VCC; VCC = 4.5 V; Ta = -40 to 85°C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Active-state supply current (per circuit)",
          "symbol": "ICC'",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": null,
          "max": 800,
          "conditions": "VIN = VCC or GND; RX/CX = 0.5 VCC; VCC = 6.0 V; Ta = -40 to 85°C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Minimum pulse width (A, B)",
          "symbol": "tw(L), tw(H)",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 95,
          "conditions": "VCC = 2.0 V; Ta = -40 to 85°C; input tr = tf = 6 ns",
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          "name": "Minimum pulse width (A, B)",
          "symbol": "tw(L), tw(H)",
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          "name": "Minimum pulse width (A, B)",
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          "name": "Minimum clear width (CD)",
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          "kind": "timing",
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          "typ": null,
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          "conditions": "VCC = 2.0 V; Ta = -40 to 85°C; input tr = tf = 6 ns",
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          "name": "Minimum clear width (CD)",
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          "name": "Minimum clear width (CD)",
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          "typ": null,
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          "conditions": "VCC = 6.0 V; Ta = -40 to 85°C; input tr = tf = 6 ns",
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          "name": "Minimum clear removal time",
          "symbol": "trem",
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          "conditions": "VCC = 2.0 V; Ta = -40 to 85°C; input tr = tf = 6 ns",
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          "name": "Minimum clear removal time",
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