AD5421BREZ-REEL7

{
  "slug": "ad5421brez-reel7",
  "version": "0.1.0",
  "type": "component",
  "description": "Analog Devices Digital To Analog Converters (DAC), HTSSOP-28. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "data acquisition",
    "ad5421brez-reel7",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
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    "README.md",
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    "ad5421brez-reel7.kicad_mod",
    "ad5421brez-reel7.glb",
    "ad5421brez-reel7.step",
    "ad5421brez-reel7.lbr",
    "docs/hero.png",
    "docs/ad5421brez-reel7-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
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    "ad5421brez-reel7-hero.overlay.json",
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  "component": {
    "mpn": "AD5421BREZ-REEL7",
    "manufacturer": "Analog Devices",
    "package": "HTSSOP-28",
    "pin_count": 29,
    "category": "Data Acquisition",
    "subcategory": "Digital To Analog Converters (DAC)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586194795853459456",
    "parts": {
      "symbol": "ad5421brez-reel7.kicad_sym",
      "footprint": "ad5421brez-reel7.kicad_mod",
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      "model_3d_plain": "ad5421brez-reel7-etched.glb",
      "model_3d_step": "ad5421brez-reel7-etched.step",
      "model_3d_step_plain": "ad5421brez-reel7.step",
      "lbr": "ad5421brez-reel7.lbr"
    },
    "distributor_links": {
      "lcsc": "C169543",
      "digikey": "505-AD5421BREZ-REEL7TR-ND",
      "mouser": "584-AD5421BREZ-R7"
    },
    "distributor_check": {
      "checked_at": "2026-10-19T08:13:59Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "505-AD5421BREZ-REEL7TR-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "584-AD5421BREZ-R7",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "IODVDD",
        "type": "power_in",
        "description": "Digital interface supply pin; the digital thresholds are referenced to the voltage applied here, which may be 1.71 V to 5.5 V relative to COM."
      },
      {
        "number": "2",
        "name": "SDO",
        "type": "output",
        "description": "Serial data output used to clock data out of the input shift register; data changes on the SCLK rising edge and is valid on the SCLK falling edge."
      },
      {
        "number": "3",
        "name": "SCLK",
        "type": "input",
        "description": "Serial clock input; data is read into the input shift register on the SCLK falling edge, with an operating clock rate of up to 30 MHz."
      },
      {
        "number": "4",
        "name": "SYNC",
        "type": "input",
        "description": "Active-low frame synchronization input; data is transferred on SCLK falling edges while SYNC is low, and the shift register data is latched on the SYNC rising edge."
      },
      {
        "number": "5",
        "name": "SDIN",
        "type": "input",
        "description": "Serial data input that must be valid on the SCLK falling edge."
      },
      {
        "number": "6",
        "name": "LDAC",
        "type": "input",
        "description": "Active-low load DAC input that updates the DAC register and output current; it must not be left floating, and if held permanently low the DAC register updates on the SYNC rising edge."
      },
      {
        "number": "7",
        "name": "FAULT",
        "type": "output",
        "description": "Active-high fault alarm output that goes high when a fault is detected (SPI failure, PEC error, loop current out of range, loop voltage low, or over-temperature)."
      },
      {
        "number": "8",
        "name": "DVDD",
        "type": "power_out",
        "description": "3.3 V digital supply output that must be decoupled to COM with 100 nF and 4.7 µF capacitors."
      },
      {
        "number": "9",
        "name": "ALARM_CURRENT_DIRECTION",
        "type": "input",
        "description": "Selects the alarm current direction: connect to DVDD for upper alarm current (22.8 mA/24 mA) or to COM for lower alarm current (3.2 mA)."
      },
      {
        "number": "10",
        "name": "RINT/REXT",
        "type": "input",
        "description": "Current-setting resistor select: connect to DVDD to use the internal current-setting resistor, or to COM to use an external resistor."
      },
      {
        "number": "11",
        "name": "RANGE0",
        "type": "input",
        "description": "Digital input that, together with RANGE1, selects the loop current range (connect to COM or DVDD per Table 9)."
      },
      {
        "number": "12",
        "name": "RANGE1",
        "type": "input",
        "description": "Digital input that, together with RANGE0, selects the loop current range (connect to COM or DVDD per Table 9)."
      },
      {
        "number": "13",
        "name": "COM",
        "type": "power_in",
        "description": "Ground reference pin for the AD5421; a 4.7 V Zener is recommended between LOOP- and COM for protection."
      },
      {
        "number": "14",
        "name": "COM",
        "type": "power_in",
        "description": "Ground reference pin for the AD5421, internally common with pin 13."
      },
      {
        "number": "15",
        "name": "REG_SEL2",
        "type": "input",
        "description": "Together with REG_SEL1 and REG_SEL0, selects the REGOUT regulator output voltage from 1.8 V to 12 V per Table 10."
      },
      {
        "number": "16",
        "name": "REG_SEL1",
        "type": "input",
        "description": "Together with REG_SEL2 and REG_SEL0, selects the REGOUT regulator output voltage from 1.8 V to 12 V per Table 10."
      },
      {
        "number": "17",
        "name": "REG_SEL0",
        "type": "input",
        "description": "Together with REG_SEL2 and REG_SEL1, selects the REGOUT regulator output voltage from 1.8 V to 12 V per Table 10."
      },
      {
        "number": "18",
        "name": "REFIN",
        "type": "input",
        "description": "Reference voltage input; 2.5 V is required for rated performance."
      },
      {
        "number": "19",
        "name": "REFOUT2",
        "type": "output",
        "description": "Internal 1.22 V reference output; a 100 nF capacitor between this pin and COM is recommended."
      },
      {
        "number": "20",
        "name": "REFOUT1",
        "type": "output",
        "description": "Internal 2.5 V reference output; a 100 nF capacitor between this pin and COM is recommended."
      },
      {
        "number": "21",
        "name": "CIN",
        "type": "passive",
        "description": "External slew-rate capacitor connection to COM for loop current slew control, and AC-coupled input for the HART FSK signal."
      },
      {
        "number": "22",
        "name": "REXT1",
        "type": "passive",
        "description": "External current-setting resistor connection; a precision 24 kΩ resistor may be connected between REXT1 and REXT2 to improve performance."
      },
      {
        "number": "23",
        "name": "REXT2",
        "type": "passive",
        "description": "External current-setting resistor connection; a precision 24 kΩ resistor may be connected between REXT1 and REXT2 to improve performance."
      },
      {
        "number": "24",
        "name": "LOOP-",
        "type": "passive",
        "description": "Loop current connection; the loop current is sensed between COM and LOOP- across the internal 52 Ω resistor, and the voltage at LOOP- is negative with respect to COM."
      },
      {
        "number": "25",
        "name": "VLOOP",
        "type": "input",
        "description": "Voltage monitor input accepting 0 V to 2.5 V, digitized to 8 bits for the fault register; a 20:1 divider allows monitoring of loop supply up to 50 V."
      },
      {
        "number": "26",
        "name": "DRIVE",
        "type": "output",
        "description": "Gate drive pin for an external depletion-mode MOSFET placed between the loop supply and REGIN."
      },
      {
        "number": "27",
        "name": "REGIN",
        "type": "power_in",
        "description": "Regulator input that accepts the loop voltage directly or through an external pass transistor; the rated input is 5.5 V to 52 V relative to LOOP-."
      },
      {
        "number": "28",
        "name": "REGOUT",
        "type": "power_out",
        "description": "Regulator output selectable from 1.8 V to 12 V via REG_SEL0-2; decouple to COM with more than 1 µF when driving a microconverter supply."
      },
      {
        "number": "29",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "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 TSSOP_EP package has an exposed pad (EPAD) that is not a numbered pin. The datasheet says it mus; Pin mapping was taken from Table 8 (TSSOP column, p.12-13) rather than the garbled text of the TSSOP; Types for these analog pins are not given as a KiCad class in the datasheet. I assigned passive base",
          "exposed pad 29 added from the footprint"
        ],
        "pages_sent": 30,
        "cost_usd": 0.1762,
        "at": "2026-10-19T08:12:08"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586194795853459456",
        "pages": 36,
        "sha256": "d9214bebc999aeb6",
        "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"
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        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "ff242f1d3be9d09e7f929707a2c5b1ee974a4f882053b04bcdb1cd2cb21223ef",
        "checked": "2026-10-19",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ad5421brez-reel7-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
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        "sha256": "e6b25cafee06d8440d4a752ccd80d6e24e579b59e36fcefdc3b24eeffe493410",
        "checked": "2026-10-19",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}