LTC2870IUFD#TRPBF

{
  "schema_version": 1,
  "type": "component",
  "slug": "ltc2870iufd-trpbf",
  "title": "LTC2870IUFD#TRPBF",
  "brief": "Analog Devices RS-485 / RS-422 ICs, QFN-28(4x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "ltc2870iufd#trpbf",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "LTC2870IUFD#TRPBF",
    "manufacturer": "Analog Devices",
    "package": "QFN-28(4x5)",
    "pin_count": 29,
    "category": "Interface",
    "subcategory": "RS-485 / RS-422 ICs",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590145891929141248",
    "parts": {
      "symbol": "ltc2870iufd-trpbf.kicad_sym",
      "footprint": "ltc2870iufd-trpbf.kicad_mod",
      "model_3d": "ltc2870iufd-trpbf-hero.glb",
      "model_3d_plain": "ltc2870iufd-trpbf-etched.glb",
      "model_3d_step": "ltc2870iufd-trpbf-etched.step",
      "model_3d_step_plain": "ltc2870iufd-trpbf.step",
      "lbr": "ltc2870iufd-trpbf.lbr"
    },
    "distributor_links": {
      "lcsc": "C580626",
      "digikey": "LTC2870IUFD#TRPBFTR-ND",
      "mouser": "584-LTC2870IUFDTRPBF"
    },
    "distributor_check": {
      "checked_at": "2026-10-21T00:55:25Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "LTC2870IUFD#TRPBFTR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "584-LTC2870IUFDTRPBF",
        "status": "found",
        "lifecycle": "Restricted Availability"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VEE",
        "type": "power_out",
        "description": "Generated negative supply (-6.3V) for the RS232 driver; tie all VEE pins together and connect a 1µF capacitor between VEE (sequentially after CAP) and GND."
      },
      {
        "number": "2",
        "name": "RA",
        "type": "output",
        "description": "RS485 differential receiver output or RS232 receiver output 1, held Hi-Z when RXEN is high."
      },
      {
        "number": "3",
        "name": "RB",
        "type": "output",
        "description": "RS232 receiver output 2, held Hi-Z when RXEN is high."
      },
      {
        "number": "4",
        "name": "485/232",
        "type": "input",
        "description": "Interface select: logic low enables RS232 mode and logic high enables RS485 mode; do not float."
      },
      {
        "number": "5",
        "name": "RXEN",
        "type": "input",
        "description": "Receiver enable: logic high disables the RS232 and RS485 receivers leaving outputs Hi-Z, logic low enables them; do not float."
      },
      {
        "number": "6",
        "name": "DXEN",
        "type": "input",
        "description": "Driver enable: logic low disables the RS232 and RS485 drivers leaving outputs Hi-Z, logic high enables them; do not float."
      },
      {
        "number": "7",
        "name": "DY",
        "type": "input",
        "description": "RS485 driver input or RS232 driver input 1; do not float."
      },
      {
        "number": "8",
        "name": "DZ",
        "type": "input",
        "description": "RS232 driver input 2; do not float."
      },
      {
        "number": "9",
        "name": "FEN",
        "type": "input",
        "description": "Fast enable: logic high keeps the integrated DC/DC converter active regardless of driver, receiver and termination enables; logic low disables fast enable mode; do not float."
      },
      {
        "number": "10",
        "name": "GND",
        "type": "power_in",
        "description": "Ground; tie all four GND pins together."
      },
      {
        "number": "11",
        "name": "CAP",
        "type": "passive",
        "description": "Charge pump capacitor for the generated negative supply; connect a 220nF capacitor between CAP and SW."
      },
      {
        "number": "12",
        "name": "VEE",
        "type": "power_out",
        "description": "Generated negative supply (-6.3V) for the RS232 driver; tie together with the other VEE pins and a 1µF capacitor to GND."
      },
      {
        "number": "13",
        "name": "GND",
        "type": "power_in",
        "description": "Ground; tie all four GND pins together."
      },
      {
        "number": "14",
        "name": "SW",
        "type": "passive",
        "description": "Switch pin for the boost converter; connect a 10µH inductor between SW and VCC."
      },
      {
        "number": "15",
        "name": "VDD",
        "type": "power_out",
        "description": "Generated positive supply (+7V) for the RS232 driver; connect a 1µF capacitor between VDD and GND."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Input supply, 3V to 5.5V; tie all three VCC pins together and connect a 2.2µF or larger capacitor between VCC (adjacent to VDD) and GND."
      },
      {
        "number": "17",
        "name": "Z",
        "type": "bidirectional",
        "description": "RS485 negative driver output or RS232 driver output 2 (LTC2870); also the RS485 negative receiver input in half-duplex mode."
      },
      {
        "number": "18",
        "name": "GND",
        "type": "power_in",
        "description": "Ground; tie all four GND pins together."
      },
      {
        "number": "19",
        "name": "Y",
        "type": "bidirectional",
        "description": "RS485 positive driver output or RS232 driver output 1 (LTC2870); also the RS485 positive receiver input in half-duplex mode."
      },
      {
        "number": "20",
        "name": "VCC",
        "type": "power_in",
        "description": "Input supply, 3V to 5.5V; tie together with the other VCC pins and the 2.2µF or larger VCC-to-GND capacitor."
      },
      {
        "number": "21",
        "name": "B",
        "type": "input",
        "description": "RS485 negative receiver input in full-duplex mode, or RS232 receiver input 2 (LTC2870)."
      },
      {
        "number": "22",
        "name": "A",
        "type": "input",
        "description": "RS485 positive receiver input in full-duplex mode, or RS232 receiver input 1 (LTC2870)."
      },
      {
        "number": "23",
        "name": "GND",
        "type": "power_in",
        "description": "Ground; tie all four GND pins together."
      },
      {
        "number": "24",
        "name": "VCC",
        "type": "power_in",
        "description": "Input supply, 3V to 5.5V; tie together with the other VCC pins and the 2.2µF or larger VCC-to-GND capacitor."
      },
      {
        "number": "25",
        "name": "VL",
        "type": "power_in",
        "description": "Logic supply, 1.7V to 5.5V, for receiver outputs, driver inputs and control inputs; keep VL ≤ VCC for proper operation."
      },
      {
        "number": "26",
        "name": "LB",
        "type": "input",
        "description": "Loopback enable: logic high routes driver input logic levels to the receiver outputs; do not float."
      },
      {
        "number": "27",
        "name": "H/F",
        "type": "input",
        "description": "RS485 half-duplex select: logic low selects full-duplex and logic high selects half-duplex operation; do not float."
      },
      {
        "number": "28",
        "name": "TE485",
        "type": "input",
        "description": "RS485 termination enable: logic high enables 120Ω resistors between A-B and Y-Z; logic low leaves them open; do not float."
      },
      {
        "number": "29",
        "name": "VEE",
        "type": "power_out",
        "description": "Exposed pad, electrically VEE (generated negative supply); must be soldered to the PCB."
      }
    ],
    "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: The package-variant pin mapping was taken from the LTC2870 QFN column of the Pin Functions table (pa; Pins RO, ROUT1, ROUT2, RIN1, RIN2, DIN1, DIN2, DI, DX232, RX232, DX485, RX485, CH2, DOUT1 and DOUT2 ; Pin 29 is the exposed thermal pad and is connected to VEE per the datasheet. It is listed here as a "
        ],
        "pages_sent": 8,
        "cost_usd": 0.0778,
        "at": "2026-10-21T00:51:48"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590145891929141248",
        "pages": 42,
        "sha256": "bed34b4f97b6f3f8",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 29,
        "described": 29,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
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        "file": "ltc2870iufd-trpbf.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4,
          5,
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        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "028686d522379f70cdcac54d7cbc05f7e8d72fe41515288068d2e2da8d27bc8d",
        "checked": "2026-10-21",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ltc2870iufd-trpbf-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "0c0f97952184e2b4cd6aec0f1023a908e641d780e2067c7422904b075d2ae994",
        "checked": "2026-10-21",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Analog Devices",
      "Package": "QFN-28(4x5)",
      "Category": "Interface",
      "Pins": "29"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "bed34b4f97b6f3f8440fed3d091317b6dd314d7f37b0bb670ddf60088a2cce8c",
      "rows": [
        {
          "name": "VCC Supply Voltage Operating Range",
          "symbol": "VCC",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 3,
          "typ": null,
          "max": 5.5,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "VL Logic Supply Voltage Operating Range",
          "symbol": "VL",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 1.7,
          "typ": null,
          "max": null,
          "conditions": "VL ≤ VCC",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "VCC Supply Current in Shutdown Mode (LTC2870)",
          "symbol": "VCC",
          "kind": "electrical",
          "unit": "µA",
          "min": 8,
          "typ": null,
          "max": 60,
          "conditions": "RXEN = VL, DXEN = TE485 = FEN = 0V, (LTC2870)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "VL Supply Current in Transceiver Mode (Outputs Unloaded)",
          "symbol": "VL",
          "kind": "electrical",
          "unit": "µA",
          "min": 0,
          "typ": null,
          "max": 5,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "|VOD| Differential Output Voltage",
          "symbol": "|VOD|",
          "kind": "electrical",
          "unit": "V",
          "min": 1.5,
          "typ": null,
          "max": 6,
          "conditions": "RL = ∞, VCC = 3V (Figure 1)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "|VOD| Differential Output Voltage",
          "symbol": "|VOD|",
          "kind": "electrical",
          "unit": "V",
          "min": 1.5,
          "typ": null,
          "max": null,
          "conditions": "RL = 27Ω, VCC = 3V (Figure 1)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "|VOD| Differential Output Voltage",
          "symbol": "|VOD|",
          "kind": "electrical",
          "unit": "V",
          "min": 2,
          "typ": null,
          "max": null,
          "conditions": "RL = 50Ω, VCC = 3.13V (Figure 1)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Difference in Magnitude of Differential Output Voltage for Complementary Output States",
          "symbol": "∆|VOD|",
          "kind": "electrical",
          "unit": "V",
          "min": 0.2,
          "typ": null,
          "max": null,
          "conditions": "RL = 27Ω, VCC = 3V (Figure 1)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Common Mode Output Voltage",
          "symbol": "VOC",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 3,
          "conditions": "RL = 27Ω or 50Ω (Figure 1)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Difference in Magnitude of Common Mode Output Voltage for Complementary Output States",
          "symbol": "∆|VOC|",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.2,
          "conditions": "RL = 27Ω or 50Ω (Figure 1)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Three-State (High Impedance) Output Current",
          "symbol": "IOZD485",
          "kind": "electrical",
          "unit": "µA",
          "min": -100,
          "typ": null,
          "max": 125,
          "conditions": "VOUT = 12V or –7V, VCC = 0V or 3.3V (Figure 2)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Maximum Short-Circuit Current",
          "symbol": "IOSD485",
          "kind": "electrical",
          "unit": "mA",
          "min": -250,
          "typ": null,
          "max": 250,
          "conditions": "–7V ≤ VOUT ≤ 12V (Figure 2)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Input Current",
          "symbol": "IIN485",
          "kind": "electrical",
          "unit": "µA",
          "min": -100,
          "typ": null,
          "max": 125,
          "conditions": "VIN = 12V or –7V, VCC = 0V or 3.3V (Figure 3) (Note 5)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Input Resistance",
          "symbol": "RIN485",
          "kind": "electrical",
          "unit": "kΩ",
          "min": 96,
          "typ": 125,
          "max": null,
          "conditions": "VIN = 12V or –7V, VCC = 0V or 3.3V (Figure 3) (Note 5)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Differential Input Signal Threshold Voltage (A-B)",
          "symbol": "",
          "kind": "electrical",
          "unit": "mV",
          "min": -200,
          "typ": null,
          "max": 200,
          "conditions": "–7V ≤ (A or B) ≤ 12V (Note 5)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Differential Input Failsafe Threshold Voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "mV",
          "min": -200,
          "typ": -70,
          "max": 0,
          "conditions": "–7V ≤ (A or B) ≤ 12V, (A-B) Rising (Note 5)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "VOL Output Low Voltage",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.4,
          "conditions": "Output Low, I(RA, RO) = 3mA (Sinking), 3V ≤ VL ≤ 5.5V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Three-State (High Impedance) Output Current",
          "symbol": "",
          "kind": "electrical",
          "unit": "µA",
          "min": -5,
          "typ": 0,
          "max": 5,
          "conditions": "0V ≤ (RA, RO) ≤VL, VL = 5.5V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Short-Circuit Output Current",
          "symbol": "",
          "kind": "electrical",
          "unit": "mA",
          "min": -125,
          "typ": null,
          "max": 125,
          "conditions": "0V ≤ (RA, RO) ≤VL, VL = 5.5V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Terminating Resistor",
          "symbol": "RTERM",
          "kind": "electrical",
          "unit": "Ω",
          "min": 108,
          "typ": 120,
          "max": 156,
          "conditions": "TE485 = VL, A – B = 2V, B = –7V, 0V, 10V (Figure 8) (Note 5)",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Output Low Voltage (RS232 driver)",
          "symbol": "VOLD",
          "kind": "electrical",
          "unit": "V",
          "min": -5,
          "typ": -5.7,
          "max": -7.5,
          "conditions": "RL = 3kΩ; VEE ≤ –5.9V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Output High Voltage (RS232 driver)",
          "symbol": "VOHD",
          "kind": "electrical",
          "unit": "V",
          "min": 5,
          "typ": 6.2,
          "max": 7.5,
          "conditions": "RL = 3kΩ; VDD ≥ 6.5V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Three-State (High Impedance) Output Current",
          "symbol": "",
          "kind": "electrical",
          "unit": "µA",
          "min": -156,
          "typ": null,
          "max": 156,
          "conditions": "Y or Z (LTC2870) = ±15V, RS232 Receiver Enabled",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Output Short-Circuit Current (RS232 driver)",
          "symbol": "",
          "kind": "electrical",
          "unit": "mA",
          "min": -35,
          "typ": null,
          "max": 90,
          "conditions": "Driver Output = 0V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Input Threshold Voltage (RS232 receiver)",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 0.6,
          "typ": 1.5,
          "max": 2.5,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Input Hysteresis (RS232 receiver)",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 0.1,
          "typ": 0.4,
          "max": 1,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Output Low Voltage (RS232 receiver)",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.4,
          "conditions": "I(RA, RB, ROUT1, ROUT2) = 1mA (Sinking) 1.7V ≤ VL ≤ 5.5V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Input Resistance (RS232 receiver)",
          "symbol": "",
          "kind": "electrical",
          "unit": "kΩ",
          "min": 3,
          "typ": 5,
          "max": 7,
          "conditions": "–15V ≤ (A, B, RIN1, RIN2) ≤ 15V, RS232 Receiver Enabled",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Three-State (High Impedance) Output Current (RS232 receiver)",
          "symbol": "",
          "kind": "electrical",
          "unit": "µA",
          "min": -5,
          "typ": 0,
          "max": 5,
          "conditions": "0V ≤ (RA, RB, ROUT1, ROUT2) ≤ VL",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Output Short-Circuit Current (RS232 receiver)",
          "symbol": "",
          "kind": "electrical",
          "unit": "mA",
          "min": -25,
          "typ": null,
          "max": 50,
          "conditions": "VL = 5.5V, 0V ≤ (RA, RB, ROUT1, ROUT2) ≤ VL",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Input Current (logic inputs)",
          "symbol": "",
          "kind": "electrical",
          "unit": "µA",
          "min": -5,
          "typ": 0,
          "max": 5,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "VDD/VEE Supply Rise Time",
          "symbol": "",
          "kind": "timing",
          "unit": "ms",
          "min": 0.2,
          "typ": null,
          "max": 2,
          "conditions": "FEN = , (Notes 3 and 4)",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "ESD HBM - LTC2870 Interface Pins (A, B, Y, Z)",
          "symbol": "",
          "kind": "electrical",
          "unit": "kV",
          "min": -26,
          "typ": null,
          "max": 26,
          "conditions": "Human Body Model to GND or VCC, Powered or Unpowered (Note 7)",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "ESD HBM - All Other Pins",
          "symbol": "",
          "kind": "electrical",
          "unit": "kV",
          "min": -4,
          "typ": null,
          "max": 4,
          "conditions": "Human Body Model (Note 7)",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Maximum Data Rate (RS485)",
          "symbol": "",
          "kind": "timing",
          "unit": "Mbps",
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