SN74CBT3257CPWR

{
  "schema_version": 1,
  "type": "component",
  "slug": "sn74cbt3257cpwr",
  "title": "SN74CBT3257CPWR",
  "brief": "Texas Instruments Signal Switches, Multiplexers, Decoders, 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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    "logic",
    "sn74cbt3257cpwr",
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  "component": {
    "mpn": "SN74CBT3257CPWR",
    "manufacturer": "Texas Instruments",
    "package": "TSSOP-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Signal Switches, Multiplexers, Decoders",
    "datasheet": "https://www.ti.com/lit/ds/symlink/sn74cbt3257c.pdf",
    "parts": {
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      "lbr": "sn74cbt3257cpwr.lbr"
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    "distributor_links": {
      "lcsc": "C2674764",
      "digikey": "296-19211-2-ND",
      "mouser": "595-SN74CBT3257CPWR"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T04:41:44Z",
      "source": "Component Ocean /api/assign-pns",
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        "pn": "296-19211-2-ND",
        "status": "found"
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        "pn": "595-SN74CBT3257CPWR",
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    },
    "pins": [
      {
        "number": "1",
        "name": "S",
        "type": "input",
        "description": "Select input that chooses the data path for the 1-of-2 multiplexer: low connects A to B1 and high connects A to B2, with control inputs TTL/5-V CMOS compatible (VIH min 2 V, VIL max 0.8 V)."
      },
      {
        "number": "2",
        "name": "1B1",
        "type": "bidirectional",
        "description": "Switch port 1B1 of the 1A channel, connected to 1A when OE is low and S is low; data I/O supports 0 to 5.5 V and the port is protected for undershoot to −2 V."
      },
      {
        "number": "3",
        "name": "1B2",
        "type": "bidirectional",
        "description": "Switch port 1B2 of the 1A channel, connected to 1A when OE is low and S is high; data I/O supports 0 to 5.5 V and the port is protected for undershoot to −2 V."
      },
      {
        "number": "4",
        "name": "1A",
        "type": "bidirectional",
        "description": "Common A port of the first 1-of-2 switch, which is connected to 1B1 or 1B2 under control of S and OE and has typical ron of 3 Ω; undershoot protected to −2 V."
      },
      {
        "number": "5",
        "name": "2B1",
        "type": "bidirectional",
        "description": "Switch port 2B1 of the 2A channel, connected to 2A when OE is low and S is low; data I/O supports 0 to 5.5 V and the port is protected for undershoot to −2 V."
      },
      {
        "number": "6",
        "name": "2B2",
        "type": "bidirectional",
        "description": "Switch port 2B2 of the 2A channel, connected to 2A when OE is low and S is high; data I/O supports 0 to 5.5 V and the port is protected for undershoot to −2 V."
      },
      {
        "number": "7",
        "name": "2A",
        "type": "bidirectional",
        "description": "Common A port of the second 1-of-2 switch, which is connected to 2B1 or 2B2 under control of S and OE and has typical ron of 3 Ω; undershoot protected to −2 V."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground reference; continuous current through the GND terminal is limited to ±100 mA absolute maximum."
      },
      {
        "number": "9",
        "name": "3A",
        "type": "bidirectional",
        "description": "Common A port of the third 1-of-2 switch, which is connected to 3B1 or 3B2 under control of S and OE and has typical ron of 3 Ω; undershoot protected to −2 V."
      },
      {
        "number": "10",
        "name": "3B2",
        "type": "bidirectional",
        "description": "Switch port 3B2 of the 3A channel, connected to 3A when OE is low and S is high; data I/O supports 0 to 5.5 V and the port is protected for undershoot to −2 V."
      },
      {
        "number": "11",
        "name": "3B1",
        "type": "bidirectional",
        "description": "Switch port 3B1 of the 3A channel, connected to 3A when OE is low and S is low; data I/O supports 0 to 5.5 V and the port is protected for undershoot to −2 V."
      },
      {
        "number": "12",
        "name": "4A",
        "type": "bidirectional",
        "description": "Common A port of the fourth 1-of-2 switch, which is connected to 4B1 or 4B2 under control of S and OE and has typical ron of 3 Ω; undershoot protected to −2 V."
      },
      {
        "number": "13",
        "name": "4B2",
        "type": "bidirectional",
        "description": "Switch port 4B2 of the 4A channel, connected to 4A when OE is low and S is high; data I/O supports 0 to 5.5 V and the port is protected for undershoot to −2 V."
      },
      {
        "number": "14",
        "name": "4B1",
        "type": "bidirectional",
        "description": "Switch port 4B1 of the 4A channel, connected to 4A when OE is low and S is low; data I/O supports 0 to 5.5 V and the port is protected for undershoot to −2 V."
      },
      {
        "number": "15",
        "name": "OE",
        "type": "input",
        "description": "Active-low output enable: low enables the switch path, high disables it into high-impedance between A and B; tie to VCC through a pullup during power up or down (control VIH min 2 V, VIL max 0.8 V)."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage, recommended operating range 4 V to 5.5 V, with ICC of 3 µA max at VCC = 5.5 V."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
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        "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: The page 1 pin-diagram text is scrambled in extraction, so the PW (TSSOP-16) pin-number-to-name mapp; The datasheet does not give a per-pin direction for the A/B switch terminals; they are typed bidirec; Pin descriptions draw on recommended operating conditions and absolute ratings from pages 4 and 5 (f"
        ],
        "pages_sent": 26,
        "cost_usd": 0.096,
        "at": "2026-10-18T04:37:28"
      },
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/sn74cbt3257c.pdf",
        "pages": 26,
        "sha256": "b08cb4ed3303b0eb",
        "source_tier": "mfr"
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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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  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "TSSOP-16",
      "Category": "Logic",
      "Pins": "16"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
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      "rows": [
        {
          "name": "Supply voltage range",
          "symbol": "VCC",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": 7,
          "conditions": "",
          "source_page": 4,
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        {
          "name": "Control input voltage range",
          "symbol": "VIN",
          "kind": "absolute_maximum",
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          "typ": null,
          "max": 7,
          "conditions": "See Notes 1 and 2",
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        {
          "name": "Switch I/O voltage range",
          "symbol": "VI/O",
          "kind": "absolute_maximum",
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          "conditions": "See Notes 1, 2, and 3",
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        {
          "name": "Control input clamp current",
          "symbol": "IIK",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -50,
          "typ": null,
          "max": null,
          "conditions": "VIN < 0",
          "source_page": 4,
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        },
        {
          "name": "I/O port clamp current",
          "symbol": "II/OK",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -50,
          "typ": null,
          "max": null,
          "conditions": "VI/O < 0",
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        {
          "name": "ON-state switch current",
          "symbol": "II/O",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -128,
          "typ": null,
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          "conditions": "See Note 4",
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        {
          "name": "Continuous current through VCC or GND terminals",
          "symbol": "",
          "kind": "absolute_maximum",
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          "min": -100,
          "typ": null,
          "max": 100,
          "conditions": "",
          "source_page": 4,
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        },
        {
          "name": "Storage temperature range",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Package thermal impedance PW package",
          "symbol": "θJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 108,
          "max": null,
          "conditions": "PW package; see Note 5 (JESD 51-7)",
          "source_page": 4,
          "source": "datasheet"
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        {
          "name": "Supply voltage",
          "symbol": "VCC",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 4,
          "typ": null,
          "max": 5.5,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "High-level control input voltage",
          "symbol": "VIH",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 2,
          "typ": null,
          "max": 5.5,
          "conditions": "",
          "source_page": 4,
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        },
        {
          "name": "Low-level control input voltage",
          "symbol": "VIL",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 0,
          "typ": null,
          "max": 0.8,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Data input/output voltage",
          "symbol": "VI/O",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 0,
          "typ": null,
          "max": 5.5,
          "conditions": "",
          "source_page": 4,
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        },
        {
          "name": "Operating free-air temperature",
          "symbol": "TA",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 85,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Control inputs clamp voltage",
          "symbol": "VIK",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -1.8,
          "conditions": "Control inputs; VCC = 4.5 V, IIN = −18 mA",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Data inputs clamp voltage",
          "symbol": "VIKU",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -2,
          "conditions": "Data inputs; VCC = 5 V, 0 mA > II ≥ −50 mA, VIN = VCC or GND, Switch OFF",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Control inputs input leakage current",
          "symbol": "IIN",
          "kind": "electrical",
          "unit": "µA",
          "min": -1,
          "typ": null,
          "max": 1,
          "conditions": "Control inputs; VCC = 5.5 V, VIN = VCC or GND",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Off-state I/O leakage current",
          "symbol": "IOZ",
          "kind": "electrical",
          "unit": "µA",
          "min": -10,
          "typ": null,
          "max": 10,
          "conditions": "VCC = 5.5 V, VO = 0 to 5.5 V, VI = 0, Switch OFF, VIN = VCC or GND",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Partial power-down leakage current",
          "symbol": "Ioff",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "VCC = 0, VO = 0 to 5.5 V, VI = 0",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Quiescent supply current",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 3,
          "conditions": "VCC = 5.5 V, II/O = 0, VIN = VCC or GND, Switch ON or OFF",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Increase in supply current per control input",
          "symbol": "ΔICC",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 2.5,
          "conditions": "Control inputs; VCC = 5.5 V, one input at 3.4 V, other inputs at VCC or GND",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "ON-state resistance at VCC = 4 V, VI = 2.4 V",
          "symbol": "ron",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": 8,
          "max": 12,
          "conditions": "VCC = 4 V, VI = 2.4 V, IO = −15 mA",
          "source_page": 5,
          "source": "datasheet"
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        {
          "name": "ON-state resistance at VCC = 4 V, VI = 0",
          "symbol": "ron",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": 3,
          "max": 6,
          "conditions": "VCC = 4 V, VI = 0, IO = 64 mA",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "ON-state resistance at VCC = 4.5 V, VI = 0",
          "symbol": "ron",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": 3,
          "max": 6,
          "conditions": "VCC = 4.5 V, VI = 0, IO = 30 mA",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "ON-state resistance at VCC = 4.5 V, VI = 2.4 V",
          "symbol": "ron",
          "kind": "electrical",
          "unit": "Ω",
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          "typ": 5,
          "max": 10,
          "conditions": "VCC = 4.5 V, VI = 2.4 V, IO = −15 mA",
          "source_page": 5,
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        },
        {
          "name": "Propagation delay S to A (VCC = 4 V ±0.5 V)",
          "symbol": "tpd(s)",
          "kind": "timing",
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          "min": null,
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          "conditions": "S to A; CL = 50 pF; see Figure 3",
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        },
        {
          "name": "Propagation delay S to A (VCC = 5 V ±0.5 V)",
          "symbol": "tpd(s)",
          "kind": "timing",
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          "min": 1.5,
          "typ": null,
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          "conditions": "S to A; CL = 50 pF; see Figure 3",
          "source_page": 5,
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        },
        {
          "name": "Enable time S to B (VCC = 4 V ±0.5 V)",
          "symbol": "ten",
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        {
          "name": "Enable time S to B (VCC = 5 V ±0.5 V)",
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        },
        {
          "name": "Enable time OE to A or B (VCC = 4 V ±0.5 V)",
          "symbol": "ten",
          "kind": "timing",
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          "min": null,
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        {
          "name": "Enable time OE to A or B (VCC = 5 V ±0.5 V)",
          "symbol": "ten",
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          "conditions": "OE to A or B; CL = 50 pF; see Figure 3",
          "source_page": 5,
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        },
        {
          "name": "Disable time S to B (VCC = 4 V ±0.5 V)",
          "symbol": "tdis",
          "kind": "timing",
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          "min": null,
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          "conditions": "S to B; CL = 50 pF; see Figure 3",
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        {
          "name": "Disable time S to B (VCC = 5 V ±0.5 V)",
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        {
          "name": "Disable time OE to A or B (VCC = 4 V ±0.5 V)",
          "symbol": "tdis",
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        {
          "name": "Disable time OE to A or B (VCC = 5 V ±0.5 V)",
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          "conditions": "OE to A or B; CL = 50 pF; see Figure 3",
          "source_page": 5,
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        },
        {
          "name": "Undershoot output voltage",
          "symbol": "VOUTU",
          "kind": "electrical",
          "unit": "V",
          "min": 2,
          "typ": null,
          "max": null,
          "conditions": "VCC = 5.5 V, Switch OFF, VIN = VCC or GND",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Control input capacitance",
          "symbol": "Cin",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": 3.5,
          "max": null,
          "conditions": "VIN = 3 V or 0",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Cio(OFF) A port",
          "symbol": "Cio(OFF)",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": 8.5,
          "max": null,
          "conditions": "VI/O = 3 V or 0, Switch OFF, VIN = VCC or GND",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Cio(OFF) B port",
          "symbol": "Cio(OFF)",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": 5.5,
          "max": null,
          "conditions": "VI/O = 3 V or 0, Switch OFF, VIN = VCC or GND",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "On-state input/output capacitance",
          "symbol": "Cio(ON)",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": 16.5,
          "max": null,
          "conditions": "VI/O = 3 V or 0, Switch ON, VIN = VCC or GND",
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