TSS521DR

{
  "slug": "tss521dr",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments Buffers, Drivers, Receivers, Transceivers, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic",
    "tss521dr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "tss521dr.kicad_sym",
    "tss521dr.kicad_mod",
    "tss521dr.glb",
    "tss521dr.step",
    "tss521dr.lbr",
    "docs/hero.png",
    "docs/tss521dr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "tss521dr-hero.glb",
    "tss521dr-hero.overlay.json"
  ],
  "component": {
    "mpn": "TSS521DR",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Buffers, Drivers, Receivers, Transceivers",
    "datasheet": "https://www.ti.com/lit/ds/symlink/tss521.pdf",
    "parts": {
      "symbol": "tss521dr.kicad_sym",
      "footprint": "tss521dr.kicad_mod",
      "model_3d": "tss521dr-hero.glb",
      "model_3d_plain": "tss521dr.glb",
      "model_3d_step": "tss521dr-etched.step",
      "model_3d_step_plain": "tss521dr.step",
      "lbr": "tss521dr.lbr"
    },
    "distributor_links": {
      "lcsc": "C2859718",
      "digikey": "296-50177-2-ND",
      "mouser": "595-TSS521DR"
    },
    "distributor_check": {
      "checked_at": "2026-10-08T20:08:11Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-50177-2-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-TSS521DR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "BUSL2",
        "type": "passive",
        "description": "Meter-Bus connection, polarity independent through the input rectifier bridge BR; bus voltage is 10.8 V to 42 V for the receiver and 12 V to 42 V for the transmitter."
      },
      {
        "number": "2",
        "name": "VB",
        "type": "power_in",
        "description": "Differential bus voltage after the rectifier, referenced to GND and monitored by comparator TC2 for power fail; the rectifier drop ΔVBR is 1.5 V max at IBUS = 3 mA."
      },
      {
        "number": "3",
        "name": "STC",
        "type": "passive",
        "description": "Support capacitor pin where storage capacitor CSTC is charged by a constant current and limited to REF1; the VDD turn-on and turn-off thresholds are monitored here."
      },
      {
        "number": "4",
        "name": "RIDD",
        "type": "passive",
        "description": "Current adjustment input; resistor RRIDD sets the STC charge current, with 13 kΩ to 80 kΩ recommended and VRIDD of 1.23 V to 1.33 V at RRIDD = 30 kΩ."
      },
      {
        "number": "5",
        "name": "PF",
        "type": "output",
        "description": "Power-fail output that is high when VVB > VSTC + 0.6 V and goes low (power fail) to warn the microcontroller of a critical voltage drop so it can save data immediately."
      },
      {
        "number": "6",
        "name": "SC",
        "type": "passive",
        "description": "Sampling capacitor pin that provides the dynamic reference level for comparator TC3, with a charge current of −15 µA to −40 µA."
      },
      {
        "number": "7",
        "name": "TXI",
        "type": "output",
        "description": "Inverted data output; VOH is at least VBAT − 0.6 V at −100 µA and VOL is 0.5 V max at 100 µA."
      },
      {
        "number": "8",
        "name": "TX",
        "type": "output",
        "description": "Noninverted data output that also repeats the receiver modulation as ECHO; VOH is at least VBAT − 0.6 V at −100 µA and VOL is 0.5 V max at 100 µA."
      },
      {
        "number": "9",
        "name": "BAT",
        "type": "power_in",
        "description": "Logic level adjust input supplied from the battery, with 2.5 V to 3.8 V recommended and VBAT(max) ≤ VSTC − 1 V."
      },
      {
        "number": "10",
        "name": "VS",
        "type": "power_out",
        "description": "Switch output for bus or battery supply, synchronized with VDD; VVS is at least VSTC − 0.4 V at IVS = −5 µA when VDD is on, and it drives an external transistor (BSS84) to switch to battery."
      },
      {
        "number": "11",
        "name": "VDD",
        "type": "power_out",
        "description": "Voltage regulator output at 3.3 V nominal; VVDD is 3.1 V to 3.4 V at −IVDD = 1 mA with VSTC = 6.5 V."
      },
      {
        "number": "12",
        "name": "RX",
        "type": "input",
        "description": "Noninverted data input that controls the slave-to-master current source CS3; VIH is up to 5.5 V only when VSTC ≥ 6.5 V and VIL is 0.8 V max."
      },
      {
        "number": "13",
        "name": "RXI",
        "type": "input",
        "description": "Inverted data input that controls the slave-to-master current source CS3; VIH is up to 5.5 V only when VSTC ≥ 6.5 V and VIL is 0.8 V max."
      },
      {
        "number": "14",
        "name": "RIS",
        "type": "passive",
        "description": "Adjust input for modulation current; programming resistor RRIS of at least 100 Ω sets the current, with VRIS of 1.4 V to 1.7 V at 100 Ω."
      },
      {
        "number": "15",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference; all voltage values in the datasheet are measured with respect to this terminal."
      },
      {
        "number": "16",
        "name": "BUSL1",
        "type": "passive",
        "description": "Meter-Bus connection, polarity independent through the input rectifier bridge BR; bus voltage is 10.8 V to 42 V for the receiver and 12 V to 42 V for the transmitter."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "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: BAT is described only as a logic level adjust input with a battery voltage range; classified as powe; Meter-Bus pins are described by function and bus voltage range only; 'passive' was chosen since the ; Analog/timing pins (VB, STC, RIDD, SC, RIS) are described by function only; 'passive' is a judgment "
        ],
        "pages_sent": 15,
        "cost_usd": 0.0707,
        "at": "2026-10-08T20:07:51"
      },
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/tss521.pdf",
        "pages": 15,
        "sha256": "fa7ed42a397edb3a",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
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        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          9.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "tss521dr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
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        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "f6a36eef29fa6164246109fda19b8d8c3f85e6ddb76cb90238e59d7586e3ebbc",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}