FE1.1S-BSOP28BCN

{
  "schema_version": 1,
  "type": "component",
  "slug": "fe1-1s-bsop28bcn",
  "title": "FE1.1S-BSOP28BCN",
  "brief": "Terminus Tech FE1 1S BSOP28BCN USB Converters, SSOP-28-150mil. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "fe1.1s-bsop28bcn"
  ],
  "component": {
    "mpn": "FE1.1S-BSOP28BCN",
    "manufacturer": "Terminus Tech FE1 1S BSOP28BCN",
    "package": "SSOP-28-150mil",
    "pin_count": 28,
    "category": "Interface",
    "subcategory": "USB Converters",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/13d3e118f5bbcdd185acaf8c9498f8e5.pdf",
    "parts": {
      "symbol": "fe1-1s-bsop28bcn.kicad_sym",
      "footprint": "fe1-1s-bsop28bcn.kicad_mod",
      "model_3d": "fe1-1s-bsop28bcn-etched.glb",
      "model_3d_plain": "fe1-1s-bsop28bcn.glb",
      "model_3d_step": "fe1-1s-bsop28bcn-etched.step",
      "model_3d_step_plain": "fe1-1s-bsop28bcn.step",
      "lbr": "fe1-1s-bsop28bcn.lbr"
    },
    "distributor_links": {
      "lcsc": "C9359"
    },
    "pins": [
      {
        "number": "1",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground reference for the digital and analog supplies."
      },
      {
        "number": "2",
        "name": "XOUT",
        "type": "output",
        "description": "12MHz crystal oscillator output. Connects to one terminal of the 12MHz crystal (16-20pF load, 50Ω ESR max, ±50ppm)."
      },
      {
        "number": "3",
        "name": "XIN",
        "type": "input",
        "description": "12MHz crystal oscillator input, or external 12MHz clock input. Integrated feedback resistor and load capacitors are provided internally."
      },
      {
        "number": "4",
        "name": "DM4",
        "type": "bidirectional",
        "description": "USB Downstream Facing Port 4 D- (differential minus). Supports High-, Full-, and Low-Speed signaling."
      },
      {
        "number": "5",
        "name": "DP4",
        "type": "bidirectional",
        "description": "USB Downstream Facing Port 4 D+ (differential plus). Supports High-, Full-, and Low-Speed signaling."
      },
      {
        "number": "6",
        "name": "DM3",
        "type": "bidirectional",
        "description": "USB Downstream Facing Port 3 D-."
      },
      {
        "number": "7",
        "name": "DP3",
        "type": "bidirectional",
        "description": "USB Downstream Facing Port 3 D+."
      },
      {
        "number": "8",
        "name": "DM2",
        "type": "bidirectional",
        "description": "USB Downstream Facing Port 2 D-."
      },
      {
        "number": "9",
        "name": "DP2",
        "type": "bidirectional",
        "description": "USB Downstream Facing Port 2 D+."
      },
      {
        "number": "10",
        "name": "DM1",
        "type": "bidirectional",
        "description": "USB Downstream Facing Port 1 D-."
      },
      {
        "number": "11",
        "name": "DP1",
        "type": "bidirectional",
        "description": "USB Downstream Facing Port 1 D+."
      },
      {
        "number": "12",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection. Was 1.8V power in pre-Revision B silicon; strongly recommended to leave unconnected in new designs. May be used for testing internal 1.8V level."
      },
      {
        "number": "13",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection. Was 3.3V power input pre-Revision B; may either be left NC or tied to pin 21 (VD33F) on the PCB for backward compatibility."
      },
      {
        "number": "14",
        "name": "REXT",
        "type": "passive",
        "description": "External bias resistor pin. Connect a 2.7kΩ ±1% resistor to VSS to establish the internal bias reference."
      },
      {
        "number": "15",
        "name": "DMU",
        "type": "bidirectional",
        "description": "USB Upstream Facing Port D- (differential minus). High-/Full-Speed transceiver."
      },
      {
        "number": "16",
        "name": "DPU",
        "type": "bidirectional",
        "description": "USB Upstream Facing Port D+ (differential plus). Includes integrated 1.5kΩ upstream pull-up."
      },
      {
        "number": "17",
        "name": "XRSTJ",
        "type": "input",
        "description": "Active-low external reset. Pull up to 3.3V for normal operation; the internal POR handles power-up. To force a reset, drive low for at least 10μs. Schmitt-trigger, 5V-tolerant."
      },
      {
        "number": "18",
        "name": "VBUSM",
        "type": "input",
        "description": "Upstream port VBUS monitor. High indicates host is powered (hub operates normally); low indicates host powered down (hub enters power-down). Schmitt-trigger, 5V-tolerant."
      },
      {
        "number": "19",
        "name": "BUSJ",
        "type": "input",
        "description": "Bus power sense. High = self-powered (supports high-power devices on downstream ports); low = bus-powered (each downstream port limited to 100mA). Schmitt-trigger, 5V-tolerant."
      },
      {
        "number": "20",
        "name": "VDD5",
        "type": "power_in",
        "description": "5V power input to the integrated 5V→3.3V regulator. Leave No-Connection if an external 3.3V source is used on VD33F."
      },
      {
        "number": "21",
        "name": "VD33F",
        "type": "power_in",
        "description": "3.3V rail - filter capacitor pin for the embedded 5V→3.3V regulator, or 3.3V input from an external source when VDD5 is unused."
      },
      {
        "number": "22",
        "name": "DRV/CHRGEN",
        "type": "bidirectional",
        "description": "Dual-function: LED drive control pin in normal operation; sampled at power-on-reset as Charging Hub Enable. Tie high at POR to enable the battery-charging (UCS) function; otherwise the pin functions as an LED drive output. I/O with 24mA drive strength."
      },
      {
        "number": "23",
        "name": "LED1/EESCL",
        "type": "bidirectional",
        "description": "LED indicator for Ports 1 and 3 (or joint indicator when LED2/JLEDEN is strapped high at POR). Also functions as the external EEPROM I²C clock (SCL). I/O with 8mA drive strength."
      },
      {
        "number": "24",
        "name": "LED2/JLEDEN",
        "type": "bidirectional",
        "description": "LED indicator for Ports 2 and 4 in normal operation; sampled at power-on-reset as Joint LED Indicator Enable - tying to 3.3V at POR enables joint port indicator mode. I/O with 8mA drive strength."
      },
      {
        "number": "25",
        "name": "PWRJ",
        "type": "output",
        "description": "Active-low, open-drain power enable output for controlling downstream device power in Ganged Power Switching mode. Toggled by the host driver to limit in-rush current or in response to over-current detection. 4mA sink capability."
      },
      {
        "number": "26",
        "name": "OVCJ",
        "type": "input",
        "description": "Active-low over-current sense input from an external current monitor. Asserts under Global Over-Current Protection. Schmitt-trigger, 5V-tolerant."
      },
      {
        "number": "27",
        "name": "TESTJ/EESDA",
        "type": "bidirectional",
        "description": "Active-low test-mode enable at POR (factory test only - leave No-Connection in end applications) or external EEPROM I²C serial data (SDA). Open-drain output with internal pull-up, 4mA sink."
      },
      {
        "number": "28",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/13d3e118f5bbcdd185acaf8c9498f8e5.pdf",
        "pages": 22,
        "sha256": "5677873747ef908e",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 28,
        "described": 28,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -3.5,
        -4.225
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SSOP-28_5.3x10.2mm_P0.65mm@sha256:bbb0d0449b996c0a",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "fe1-1s-bsop28bcn.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          7.8,
          10.2,
          2.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "7aa76979ae41da44bded1ed74115012868f2f3f5a757faf32bb9df4f92c1e313",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "fe1-1s-bsop28bcn-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          7.8,
          10.2,
          2.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "77fbd003f84b019dad741d800ca05a2495faf0c2c885ea53fb8468e48950b0ce",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Terminus Tech",
      "Package": "SSOP-28-150mil",
      "Category": "Interface",
      "Pins": "28"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "fe1.1s-bsop28bcn"
  ],
  "discovery_pitch": "FE1.1S-BSOP28BCN (Terminus Tech FE1 1S BSOP28BCN) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "fe1-1s-bsop28bcn.kicad_sym",
    "fe1-1s-bsop28bcn.kicad_mod",
    "fe1-1s-bsop28bcn.glb",
    "fe1-1s-bsop28bcn.step",
    "fe1-1s-bsop28bcn-etched.step",
    "fe1-1s-bsop28bcn.lbr",
    "docs/hero.png",
    "docs/fe1-1s-bsop28bcn-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
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  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "FE1.1S-BSOP28BCN",
      "kind": "packaging"
    },
    {
      "mpn": "FE1.1S-BSOP28BCNTR",
      "kind": "packaging"
    },
    {
      "mpn": "FE1.1S-BSOP28BCNBQFN24B",
      "kind": "packaging"
    },
    {
      "mpn": "FE1.1S-BSOP28BCNBQFN24BT",
      "kind": "packaging"
    },
    {
      "mpn": "FE1.1S-BSOP28BCNBQFN24BV",
      "kind": "packaging"
    },
    {
      "mpn": "FE1.1S-BSOP28BCNBQFP48B",
      "kind": "packaging"
    },
    {
      "mpn": "FE1.1S-BSOP28BCNBQFP48BT",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-24T20:34:34.278Z"
}