DS8921AMX

{
  "schema_version": 1,
  "type": "component",
  "slug": "ds8921amx",
  "title": "DS8921AMX",
  "brief": "Texas Instruments RS-485/RS-422 ICs, SOIC-8. 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",
    "communication interface chip-uart-485-232",
    "ds8921amx",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "DS8921AMX",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Communication Interface Chip/UART/485/232",
    "subcategory": "RS-485/RS-422 ICs",
    "datasheet": "https://www.ti.com/lit/ds/symlink/ds8921amx.pdf",
    "parts": {
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      "footprint": "ds8921amx.kicad_mod",
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      "model_3d_step": "ds8921amx-etched.step",
      "model_3d_step_plain": "ds8921amx.step",
      "lbr": "ds8921amx.lbr"
    },
    "distributor_links": {
      "lcsc": "C2865923",
      "digikey": "DS8921AMXTR-ND",
      "mouser": "926-DS8921AMX"
    },
    "distributor_check": {
      "checked_at": "2026-10-27T00:42:20Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "DS8921AMXTR-ND",
        "status": "found",
        "lifecycle": "Obsolete"
      },
      "mouser": {
        "pn": "926-DS8921AMX",
        "status": "found",
        "lifecycle": "Obsolete"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VCC",
        "type": "power_in",
        "description": "Power supply pin for the 5-V supply (4.5 V to 5.5 V recommended), to be bypassed with a 0.1-µF capacitor placed close to the pin."
      },
      {
        "number": "2",
        "name": "RO",
        "type": "output",
        "description": "Receiver output, TTL-compatible single-ended output of the differential receiver."
      },
      {
        "number": "3",
        "name": "DI",
        "type": "input",
        "description": "TTL/CMOS-compatible driver input."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Power ground pin."
      },
      {
        "number": "5",
        "name": "DO-",
        "type": "output",
        "description": "Complementary differential driver output (DO-) that drives the twisted-pair or parallel-wire transmission line."
      },
      {
        "number": "6",
        "name": "DO+",
        "type": "output",
        "description": "Differential driver output (DO+) that drives the transmission line and follows DI per the function table."
      },
      {
        "number": "7",
        "name": "RI-",
        "type": "input",
        "description": "Differential receiver input (RI-) with ±200 mV sensitivity over a ±7 V common-mode range."
      },
      {
        "number": "8",
        "name": "RI+",
        "type": "input",
        "description": "Differential receiver input (RI+) with ±200 mV sensitivity over a ±7 V common-mode range."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
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        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
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        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The pin table describes DO+/DO– and RI+/RI– as 'Inverting and non-inverting', in that order, which s; The pin-function table gives no I/O type for VCC and GND, so power_in was inferred. The package draw"
        ],
        "pages_sent": 22,
        "cost_usd": 0.1426,
        "at": "2026-10-27T00:41:57"
      },
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/ds8921amx.pdf",
        "pages": 22,
        "sha256": "0be14ebc915d205b",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
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  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "SOIC-8",
      "Category": "Communication Interface Chip/UART/485/232",
      "Pins": "8"
    },
    "characteristics": {
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          "kind": "recommended_operating",
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        {
          "name": "Operating Temperature DS8921/DS8921A",
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          "min": 0,
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          "conditions": "",
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        {
          "name": "Receiver Threshold Voltage",
          "symbol": "VTH",
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          "unit": "mV",
          "min": -200,
          "typ": 35,
          "max": 200,
          "conditions": "-7 V ≤ VCM ≤ +7 V (typ printed as ±35)",
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        {
          "name": "Receiver Hysteresis",
          "symbol": "VHYST",
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        },
        {
          "name": "Receiver Input Resistance",
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          "kind": "electrical",
          "unit": "kΩ",
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          "name": "Receiver Input Current",
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          "name": "Receiver Output High Voltage",
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        },
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          "name": "Receiver Output Low Voltage",
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        },
        {
          "name": "Receiver Short-Circuit Current",
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        },
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          "name": "Driver Input High Voltage",
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          "name": "Driver Input Current",
          "symbol": "II",
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          "name": "Driver Input Clamp Voltage",
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          "name": "Driver Output Off Current",
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          "kind": "electrical",
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          "max": 100,
          "conditions": "VCC = 0V, VOUT = 5.5 V",
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        {
          "name": "Driver Output Voltage Difference",
          "symbol": "|VT| – |VT|",
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          "name": "Driver Differential Output Voltage",
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          "name": "Driver Offset Voltage Difference",
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          "name": "Driver Short-Circuit Current",
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          "unit": "mA",
          "min": -30,
          "typ": null,
          "max": -150,
          "conditions": "VCC = MAX, VOUT = 0 V",
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        {
          "name": "Supply Current",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
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          "conditions": "VCC = MAX, VOUT = Logic 0",
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        {
          "name": "Receiver Propagation Delay tpLH",
          "symbol": "tpLH",
          "kind": "timing",
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          "min": null,
          "typ": 14,
          "max": 20,
          "conditions": "CL = 30 pF",
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          "name": "Driver Single-Ended tpLH",
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        {
          "name": "Driver Transition Time tTLH",
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          "name": "Differential Input Voltage",
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          "name": "Maximum Package Power Dissipation, D Package",
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          "unit": "mW",
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          "conditions": "Soldering, 4 sec.",
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          "name": "Maximum Junction Temperature",
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