GB490H

{
  "schema_version": 1,
  "type": "component",
  "slug": "gb490h",
  "title": "GB490H",
  "brief": "GEC RS-485 / RS-422 ICs, SOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "gb490h"
  ],
  "component": {
    "mpn": "GB490H",
    "manufacturer": "GEC",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "Interface",
    "subcategory": "RS-485 / RS-422 ICs",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2201121530_GEC-GB490H_C2932177.pdf",
    "parts": {
      "symbol": "gb490h.kicad_sym",
      "footprint": "gb490h.kicad_mod",
      "model_3d": "gb490h-etched.glb",
      "model_3d_plain": "gb490h.glb",
      "model_3d_step": "gb490h-etched.step",
      "model_3d_step_plain": "gb490h.step",
      "lbr": "gb490h.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply, 3.0 V to 5.25 V (3.3 V/5 V nominal). Bypass to GND with a 0.1 µF ceramic capacitor. Quiescent supply current ICC ≈ 0.35 mA typ, 1 mA max."
      },
      {
        "number": "2",
        "name": "RO",
        "type": "output",
        "description": "Receiver output (CMOS). Drives high when V(A)-V(B) ≥ -50 mV and low when V(A)-V(B) ≤ -200 mV. Fail-safe: outputs high when receiver inputs are open or shorted. VOH ≥ VCC-0.6 V at -4 mA; VOL ≤ 0.4 V at 4 mA."
      },
      {
        "number": "3",
        "name": "DI",
        "type": "input",
        "description": "Driver input (CMOS logic). DI=high forces Y high and Z low; DI=low forces Y low and Z high. VIH ≥ 2.0 V, VIL ≤ 0.8 V, 100 mV hysteresis, ±1 µA input leakage."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground reference. All voltages are referenced to this pin."
      },
      {
        "number": "5",
        "name": "Y",
        "type": "output",
        "description": "RS-422/RS-485 differential bus non-inverting driver output. Follows DI (Y=DI). Supports ±15 kV HBM and ±12 kV IEC 61000-4-2 contact-discharge ESD. Absolute bus voltage rating -8 V to +13 V."
      },
      {
        "number": "6",
        "name": "Z",
        "type": "output",
        "description": "RS-422/RS-485 differential bus inverting driver output. Complement of Y (Z = /DI). Supports ±15 kV HBM and ±12 kV IEC 61000-4-2 contact-discharge ESD. Absolute bus voltage rating -8 V to +13 V."
      },
      {
        "number": "7",
        "name": "B",
        "type": "input",
        "description": "RS-422/RS-485 differential bus receiver inverting input. Input impedance 96 kΩ min (1/8 unit load), allowing up to 256 nodes on the bus. Common-mode range -7 V to +12 V. Supports ±15 kV HBM ESD."
      },
      {
        "number": "8",
        "name": "A",
        "type": "input",
        "description": "RS-422/RS-485 differential bus receiver non-inverting input. Input impedance 96 kΩ min (1/8 unit load). Common-mode range -7 V to +12 V. Receiver threshold VTH = -200 mV to -50 mV. Supports ±15 kV HBM ESD."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2201121530_GEC-GB490H_C2932177.pdf",
        "pages": 9,
        "sha256": "79b49ce9d1da54d4",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "gb490h.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "gb490h-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "3c353cb98785d0d3ed027109f0779cd68048e29efbe9d82dc9b4531995c206d7",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "GEC",
      "Package": "SOP-8",
      "Category": "Interface",
      "Pins": "8"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "gb490h"
  ],
  "discovery_pitch": "GB490H (GEC) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "gb490h.kicad_sym",
    "gb490h.kicad_mod",
    "gb490h.glb",
    "gb490h.step",
    "gb490h.lbr",
    "docs/hero.png",
    "docs/gb490h-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-24T20:53:20.699Z"
}