CD74HC4538PWR

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  "type": "component",
  "slug": "cd74hc4538pwr",
  "title": "CD74HC4538PWR",
  "brief": "Texas Instruments Monostable Multivibrators, TSSOP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
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  "component": {
    "mpn": "CD74HC4538PWR",
    "manufacturer": "Texas Instruments",
    "package": "TSSOP-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Monostable Multivibrators",
    "datasheet": "https://www.ti.com/lit/ds/symlink/cd74hc4538.pdf",
    "parts": {
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      "lbr": "cd74hc4538pwr.lbr"
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    "distributor_links": {
      "lcsc": "C354056",
      "mouser": "595-CD74HC4538PWR"
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    },
    "pins": [
      {
        "number": "1",
        "name": "1CX",
        "type": "passive",
        "description": "External timing capacitor CX for monostable 1; CX minimum is 0pF, and a protection diode or 51Ω series resistor is required when CX is 0.5µF or more."
      },
      {
        "number": "2",
        "name": "1RXCX",
        "type": "passive",
        "description": "Common RX/CX timing node for monostable 1; RX minimum is 5kΩ, and the current into this pin must not exceed 30mA."
      },
      {
        "number": "3",
        "name": "1R",
        "type": "input",
        "description": "Reset input for monostable 1, which resets the output independently of RX and CX."
      },
      {
        "number": "4",
        "name": "1A",
        "type": "input",
        "description": "Leading-edge trigger input for monostable 1 with Schmitt-trigger action; an unused A input must be tied to GND."
      },
      {
        "number": "5",
        "name": "1B",
        "type": "input",
        "description": "Trailing-edge trigger input for monostable 1 with Schmitt-trigger action; an unused B input must be tied to VCC."
      },
      {
        "number": "6",
        "name": "1Q",
        "type": "output",
        "description": "Buffered output of monostable 1, giving the timed output pulse width set by RX and CX."
      },
      {
        "number": "7",
        "name": "~{1Q}",
        "type": "output",
        "description": "Buffered complementary output of monostable 1."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference; all voltages are referenced to ground."
      },
      {
        "number": "9",
        "name": "~{2Q}",
        "type": "output",
        "description": "Buffered complementary output of monostable 2."
      },
      {
        "number": "10",
        "name": "2Q",
        "type": "output",
        "description": "Buffered output of monostable 2, giving the timed output pulse width set by RX and CX."
      },
      {
        "number": "11",
        "name": "2B",
        "type": "input",
        "description": "Trailing-edge trigger input for monostable 2 with Schmitt-trigger action; an unused B input must be tied to VCC."
      },
      {
        "number": "12",
        "name": "2A",
        "type": "input",
        "description": "Leading-edge trigger input for monostable 2 with Schmitt-trigger action; an unused A input must be tied to GND."
      },
      {
        "number": "13",
        "name": "2R",
        "type": "input",
        "description": "Reset input for monostable 2, which resets the output independently of RX and CX."
      },
      {
        "number": "14",
        "name": "2RXCX",
        "type": "passive",
        "description": "Common RX/CX timing node for monostable 2; RX minimum is 5kΩ, and the current into this pin must not exceed 30mA."
      },
      {
        "number": "15",
        "name": "2CX",
        "type": "passive",
        "description": "External timing capacitor CX for monostable 2; CX minimum is 0pF, and a protection diode or 51Ω series resistor is required when CX is 0.5µF or more."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage: 2V to 6V for HC types and 4.5V to 5.5V for HCT types."
      }
    ],
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      "extractor": "extract_pins 0.3",
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        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Pin names and numbers were reconstructed from the garbled pinout figure on page 1 and cross-checked "
        ],
        "pages_sent": 26,
        "cost_usd": 0.0691,
        "at": "2026-10-17T16:30:10"
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      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/cd74hc4538.pdf",
        "pages": 26,
        "sha256": "f6de650fa01c440e",
        "source_tier": "mfr"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
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        "refuses_to_fabricate": true
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  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "TSSOP-16",
      "Category": "Logic",
      "Pins": "16"
    },
    "characteristics": {
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          "name": "DC input diode current",
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          "name": "DC VCC or ground current",
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          "name": "Maximum junction temperature",
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        {
          "name": "Maximum lead temperature",
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          "conditions": "Soldering 10s (SOIC lead tips only)",
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          "name": "High level input voltage",
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          "name": "High level output voltage, CMOS loads",
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        {
          "name": "High level output voltage, CMOS loads",
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          "name": "High level output voltage, CMOS loads",
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          "name": "High level output voltage, TTL loads",
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          "name": "High level output voltage, TTL loads",
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        {
          "name": "Low level output voltage, CMOS loads",
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          "name": "Input leakage current A, B, R",
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          "name": "Quiescent device current",
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          "name": "Active device current, Q high and pins 2, 14 at VCC/4",
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          "name": "Input pulse width, A, B",
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          "name": "Reset recovery time",
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          "name": "Propagation delay tPLH, A, B to Q",
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