TX6121

{
  "schema_version": 1,
  "type": "component",
  "slug": "tx6121",
  "title": "TX6121",
  "brief": "XDS LED Drivers, SOT-23-6. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "led-drv",
    "tx6121"
  ],
  "component": {
    "mpn": "TX6121",
    "manufacturer": "XDS",
    "package": "SOT-23-6",
    "pin_count": 6,
    "category": "LED-drv",
    "subcategory": "LED Drivers",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/e4cded9d34c8d740e6f0e60401313e66.pdf",
    "parts": {
      "symbol": "tx6121.kicad_sym",
      "footprint": "tx6121.kicad_mod",
      "model_3d": "tx6121-etched.glb",
      "model_3d_plain": "tx6121.glb",
      "model_3d_step": "tx6121-etched.step",
      "model_3d_step_plain": "tx6121.step",
      "lbr": "tx6121.lbr"
    },
    "distributor_links": {
      "lcsc": "C329273"
    },
    "pins": [
      {
        "number": "1",
        "name": "DRV",
        "type": "output",
        "description": "External MOSFET gate driver output. Drives the gate of the external N-channel power MOS switch. Typical rise/fall time 50 ns into 500 pF load; minimum on-time 250 ns."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground reference for all internal circuitry and the CS sense resistor return."
      },
      {
        "number": "3",
        "name": "DIM",
        "type": "input",
        "description": "Dimming input. Pulling below ~0.2 V shuts off the LED output; driving above 1.3 V gives 100% output current. Supports both PWM dimming and linear (analog) dimming with an analog range of 0.3-1.25 V. Must not be left floating; tie high if dimming is not used. For linear dimming, connect a small (>=10 nF) capacitor to GND."
      },
      {
        "number": "4",
        "name": "VDD",
        "type": "power_in",
        "description": "Chip supply pin with internal VDD shunt (zener) regulator, typically clamped at 5.5 V (I_VDD < 10 mA). Fed from the input rail (3.6-100 V) through an external dropping resistor R1 = (VIN - VDD)/I_VDD. UVLO threshold 3.2 V (rising) with 0.5 V hysteresis; operating current 1.3 mA at 200 kHz."
      },
      {
        "number": "5",
        "name": "TOFF",
        "type": "input",
        "description": "Off-time setting pin. Fixed switch off-time is set by a capacitor C1 to GND via T_OFF = 0.51 x 150 kOhm x (C1 + 8 pF) + T_D, where T_D = 61 ns. With no external capacitor, off-time defaults to ~650 ns (internal)."
      },
      {
        "number": "6",
        "name": "CS",
        "type": "input",
        "description": "Inductor peak current sense input. Compared against internal threshold VCS_TH (typ 255 mV, 245-265 mV) to terminate the MOSFET on-cycle. Connect to the top of the external current-sense resistor R2 between the MOSFET source and GND."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/e4cded9d34c8d740e6f0e60401313e66.pdf",
        "pages": 7,
        "sha256": "771392e4b805f3f6",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 6,
        "described": 6,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -1.1375,
        -0.95
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOT-23-6@sha256:f341c73aac9dcb55",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "tx6121.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,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "c9fe686b4d1b56927a41fa84a9bc1efb61d8a45a123a3db43bcaa05c2891d635",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "tx6121-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,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "3cbb44a9001a83234d1e7de44013c38f49117619a9d117c8fa7ca3cfd6fb70b8",
        "checked": "2026-10-26",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "XDS",
      "Package": "SOT-23-6",
      "Category": "LED-drv",
      "Pins": "6"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "tx6121"
  ],
  "discovery_pitch": "TX6121 (XDS) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "tx6121.kicad_sym",
    "tx6121.kicad_mod",
    "tx6121.glb",
    "tx6121.step",
    "tx6121-etched.step",
    "tx6121.lbr",
    "docs/hero.png",
    "docs/tx6121-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-25T13:18:52.286Z"
}