SN75176B

{
  "schema_version": 1,
  "type": "component",
  "slug": "sn75176b",
  "title": "SN75176B",
  "brief": "TI differential bus transceiver, SOIC-8. RS-485/RS-422, up to 32 nodes, driver + receiver with enables. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "rs-485",
    "rs-422",
    "transceiver",
    "soic-8",
    "texas-instruments"
  ],
  "component": {
    "mpn": "SN75176B",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Interface IC",
    "subcategory": "RS-485 / RS-422 transceiver",
    "datasheet": "https://www.ti.com/lit/ds/symlink/sn75176b.pdf",
    "parts": {
      "symbol": "sn75176b.kicad_sym",
      "footprint": "sn75176b.kicad_mod",
      "model_3d": "sn75176b-etched.glb",
      "model_3d_plain": "sn75176b.glb",
      "lbr": "sn75176b.lbr",
      "model_3d_step": "sn75176b-etched.step",
      "model_3d_step_plain": "sn75176b.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "R",
        "type": "output",
        "description": "Receiver logic data output. Presents the demodulated single-ended logic level from the differential RS-485 bus (A minus B). High-impedance (tri-state) when RE is deasserted (logic high). VOH ≥ 2.7 V at IOH = -400 µA; VOL ≤ 0.45 V at IOL = 8 mA."
      },
      {
        "number": "2",
        "name": "RE",
        "type": "input",
        "description": "Receiver enable, active low. Drive low (VIL ≤ 0.8 V) to enable the receiver output R; drive high (VIH ≥ 2 V) to force R into the high-impedance state. Typically tied to DE (or its inverse) to form a direction-control pin."
      },
      {
        "number": "3",
        "name": "DE",
        "type": "input",
        "description": "Driver enable, active high. Drive high (VIH ≥ 2 V) to enable the differential driver onto A/B; drive low (VIL ≤ 0.8 V) to place the driver outputs in the high-impedance state so the bus can be shared by other transceivers."
      },
      {
        "number": "4",
        "name": "D",
        "type": "input",
        "description": "Driver logic data input. Single-ended TTL/CMOS-compatible logic level that is transmitted differentially onto the A/B bus lines when DE is asserted high. VIH ≥ 2 V, VIL ≤ 0.8 V."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground reference. Connect to the system ground plane. All logic-level voltages and the -1 V to +3 V common-mode window on A/B are referenced to this pin."
      },
      {
        "number": "6",
        "name": "A",
        "type": "bidirectional",
        "description": "Non-inverting differential bus I/O for RS-422 / RS-485. Driven by the internal driver when DE is high, and monitored by the receiver relative to B. Wide input/output common-mode range and clamp diodes protect against bus faults; short-circuit current is internally limited."
      },
      {
        "number": "7",
        "name": "B",
        "type": "bidirectional",
        "description": "Inverting differential bus I/O for RS-422 / RS-485. Driven complementary to A when DE is high; forms the negative side of the differential pair sensed by the receiver. Tolerates -10 V to +15 V at the bus terminal (absolute max)."
      },
      {
        "number": "8",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply input, 5 V nominal (4.75 V to 5.25 V recommended, 7 V absolute max). Bypass with a 0.1 µF ceramic capacitor to GND close to the pin. ICC ≈ 42 mA typ (outputs enabled), 26 mA typ (outputs disabled)."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/sn75176b.pdf",
        "pages": 30,
        "sha256": "6967824b2ea2d976",
        "source_tier": "mfr"
      },
      "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": "sn75176b.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sn75176b-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "0168892a772d133630ee0421e0f94e711020df41b288bce1de826748178393e3",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "RS-485/RS-422 transceiver",
      "Channels": "1 driver + 1 receiver",
      "Bus": "differential A/B, up to 32 nodes",
      "Enables": "DE (driver) + /RE (receiver)",
      "Data rate": "up to 10 Mbps",
      "Fail-safe": "contention-protected outputs",
      "Supply voltage": "5 V",
      "Package": "SOIC-8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "sn75176b",
    "rs-485 transceiver",
    "rs-422",
    "differential bus",
    "485 driver receiver"
  ],
  "discovery_pitch": "SN75176B differential RS-485/RS-422 bus transceiver (SOIC-8) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "sn75176b.kicad_sym",
    "sn75176b.kicad_mod",
    "sn75176b.glb",
    "sn75176b.lbr",
    "docs/hero.png",
    "docs/sn75176b-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "sn75176b-etched.step"
  ],
  "variants": [
    {
      "mpn": "SN75176BD (SOIC-8)",
      "kind": "packaging"
    },
    {
      "mpn": "SN75176BP (PDIP-8)",
      "kind": "packaging"
    }
  ]
}