TD9521B

{
  "slug": "td9521b",
  "version": "0.1.0",
  "type": "component",
  "description": "Techcode Semicon Power Distribution Switches, SOT-23-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "td9521b",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "td9521b.kicad_sym",
    "td9521b.kicad_mod",
    "td9521b.glb",
    "td9521b.step",
    "td9521b.lbr",
    "docs/hero.png",
    "docs/td9521b-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "td9521b-hero.glb",
    "td9521b-hero.overlay.json",
    "td9521b-etched.glb"
  ],
  "component": {
    "mpn": "TD9521B",
    "manufacturer": "Techcode Semicon",
    "package": "SOT-23-5",
    "pin_count": 5,
    "category": "Power Management (PMIC)",
    "subcategory": "Power Distribution Switches",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588954802462339072",
    "parts": {
      "symbol": "td9521b.kicad_sym",
      "footprint": "td9521b.kicad_mod",
      "model_3d": "td9521b-hero.glb",
      "model_3d_plain": "td9521b-etched.glb",
      "model_3d_step": "td9521b-etched.step",
      "model_3d_step_plain": "td9521b.step",
      "lbr": "td9521b.lbr"
    },
    "distributor_links": {
      "lcsc": "C2935203"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T09:51:48Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VOUT",
        "type": "power_out",
        "description": "Output voltage pin that follows the input voltage through the 35mΩ N-channel power switch, and is discharged by an internal resistor when ENB is high or EN is low (datasheet text, as printed)."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference pin for the device; the datasheet gives no further electrical limit for this pin."
      },
      {
        "number": "3",
        "name": "ISET",
        "type": "passive",
        "description": "Current-limit set pin: the current-limit threshold is ILim = 120k × 1.14 V / Riset, so Riset to ground programs the limit (Riset = 51 kΩ gives 2.5 to 2.85 A in the electrical characteristics)."
      },
      {
        "number": "4",
        "name": "EN",
        "type": "input",
        "description": "Enable input: high enables the device and low disables it, and the EN pin cannot be left floating."
      },
      {
        "number": "5",
        "name": "VIN",
        "type": "power_in",
        "description": "Power supply input that connects to the external DC supply, rated 3.5 V to 5.5 V in the recommended operating conditions."
      }
    ],
    "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: Datasheet pin description says 'When ENB is high or EN is low', but the device has only an EN pin an; EN thresholds conflict: the Electrical Characteristics table lists VIH = 2.7 V typ and VIL = 2.6 V t; Pin type 'passive' was chosen because ISET is a resistor-programmed set pin; the datasheet does not "
        ],
        "pages_sent": 10,
        "cost_usd": 0.0391,
        "at": "2026-10-18T09:48:48"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588954802462339072",
        "pages": 10,
        "sha256": "c0da5a40e7e31cb8",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 5,
        "described": 5,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "td9521b.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.8,
          2.9,
          1.55
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "720a6eab0024069bbee68e7cb4c3ff1149468a34611225cdc852662c5d0ec2b7",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "td9521b-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.8,
          2.9,
          1.55
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "3da639ffee88f18e81b142c9fe322af9bdbd62269c80035271ba2918a77c94e0",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}