ADM1278-1ACPZ-RL

{
  "schema_version": 1,
  "type": "component",
  "slug": "adm1278-1acpz-rl",
  "title": "ADM1278-1ACPZ-RL",
  "brief": "Analog Devices Surge Protection Devices (SPDs), LFCSP-32(5x5). 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",
    "circuit protection",
    "adm1278-1acpz-rl",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "ADM1278-1ACPZ-RL",
    "manufacturer": "Analog Devices",
    "package": "LFCSP-32(5x5)",
    "pin_count": 33,
    "category": "Circuit Protection",
    "subcategory": "Surge Protection Devices (SPDs)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589803179086426112",
    "parts": {
      "symbol": "adm1278-1acpz-rl.kicad_sym",
      "footprint": "adm1278-1acpz-rl.kicad_mod",
      "model_3d": "adm1278-1acpz-rl-etched.glb",
      "model_3d_plain": "adm1278-1acpz-rl.glb",
      "model_3d_step": "adm1278-1acpz-rl-etched.step",
      "model_3d_step_plain": "adm1278-1acpz-rl.step",
      "lbr": "adm1278-1acpz-rl.lbr"
    },
    "distributor_links": {
      "lcsc": "C657901"
    },
    "pins": [
      {
        "number": "1",
        "name": "PSET",
        "type": "input",
        "description": "Power limit programming pin; FET power limit = (VPSET × 8)/(50 × RSENSE) with reference threshold 1.35 to 1.65 V when compared to 2.7 V internal reference."
      },
      {
        "number": "2",
        "name": "VCAP",
        "type": "power_in",
        "description": "Internal regulated supply output 2.68 to 2.72 V (A/AA grade) or 2.66 to 2.74 V (B grade), requires 1 μF or greater capacitor, with maximum load 100 μA for accuracy."
      },
      {
        "number": "3",
        "name": "ISET",
        "type": "input",
        "description": "Current limit threshold programmable via resistor divider from VCAP for 5 to 25 mV sense voltage, with internal 1 V reference when VISET exceeds 1.5 V threshold."
      },
      {
        "number": "4",
        "name": "ISTART",
        "type": "input",
        "description": "Start-up current limit input for dv/dt power-up mode, active only while PWRGD is low, with reference threshold 1.35 to 1.65 V for mode selection."
      },
      {
        "number": "5",
        "name": "TIMER",
        "type": "input",
        "description": "Timer capacitor pin for setting initial insertion delay (minimum 27 ms) and fault regulation time, with thresholds 0.2 V and 1.0 V, pull-up currents 3 and 60 μA, pull-down currents 2 and 100 μA."
      },
      {
        "number": "6",
        "name": "FAULT",
        "type": "tri_state",
        "description": "Open-drain latched fault output asserts low upon overcurrent timeout, overtemperature, or FET health fault detection, with VOL maximum 0.4 V at 1 mA."
      },
      {
        "number": "7",
        "name": "ADR1",
        "type": "input",
        "description": "PMBus address decode pin; can be tied to GND (low), VCAP (high), left floating (high-Z), or 150 kΩ to GND (resistor) for 16 unique device addresses."
      },
      {
        "number": "8",
        "name": "ADR2",
        "type": "input",
        "description": "PMBus address decode pin; can be tied to GND (low), VCAP (high), left floating (high-Z), or 150 kΩ to GND (resistor) for 16 unique device addresses."
      },
      {
        "number": "9",
        "name": "NIC",
        "type": "unconnected",
        "description": "Not internally connected."
      },
      {
        "number": "10",
        "name": "NIC",
        "type": "unconnected",
        "description": "Not internally connected."
      },
      {
        "number": "11",
        "name": "NIC",
        "type": "unconnected",
        "description": "Not internally connected."
      },
      {
        "number": "12",
        "name": "ENABLE",
        "type": "input",
        "description": "Active high digital input with VIH 1.1 V and VIL 0.8 V; must be high to allow hot swap controller power-up sequence with 1 μs glitch filter."
      },
      {
        "number": "13",
        "name": "GPO1/ALERT1/CONV",
        "type": "tri_state",
        "description": "Open-drain output configurable as general-purpose output, alert signal, or conversion input, defaults to alert output at power-up with VOL maximum 0.4 V at 1 mA."
      },
      {
        "number": "14",
        "name": "GPO2/ALERT2",
        "type": "tri_state",
        "description": "Open-drain output configurable as general-purpose output or alert signal, defaults to alert output at power-up with VOL maximum 0.4 V at 1 mA."
      },
      {
        "number": "15",
        "name": "SDA",
        "type": "bidirectional",
        "description": "Open-drain serial data input/output for PMBus interface, requires external pull-up resistor, with VIH 1.1 V and VIL 0.8 V input thresholds."
      },
      {
        "number": "16",
        "name": "SCL",
        "type": "input",
        "description": "Open-drain serial clock input for PMBus interface, requires external pull-up resistor, with VIH 1.1 V and VIL 0.8 V input thresholds."
      },
      {
        "number": "17",
        "name": "RETRY",
        "type": "input",
        "description": "Retry mode selection pin with internal 8 μA pull-up; floating enables latch-off mode after overcurrent fault, pulling low enables 10 second automatic retry."
      },
      {
        "number": "18",
        "name": "PWRGD",
        "type": "tri_state",
        "description": "Open-drain power-good signal output asserts high when output voltage above threshold, no faults active, hot swap enabled, and MOSFET fully enhanced, with VOL maximum 0.4 V at 1 mA."
      },
      {
        "number": "19",
        "name": "CSOUT",
        "type": "output",
        "description": "Current sense amplifier output with 350 V/V gain (CSOUT = VSENSE_HS × 350), short-circuit current limited to 5 mA, with ±1.6% total output error at 20 mV sense."
      },
      {
        "number": "20",
        "name": "VOUT",
        "type": "input",
        "description": "Output voltage measurement input via 1 kΩ series resistor to FET source; used by 12-bit ADC for voltage monitoring and by constant power foldback for VDS calculation."
      },
      {
        "number": "21",
        "name": "PWGIN",
        "type": "input",
        "description": "Power-good threshold input pin; comparator threshold 1.0 V with 50 to 70 mV hysteresis, input current 50 nA at voltages ≤3.6 V."
      },
      {
        "number": "22",
        "name": "GND",
        "type": "power_in",
        "description": "Analog ground connection for sensitive nodes; must be isolated from main high current path and connected to main ground plane at single point."
      },
      {
        "number": "23",
        "name": "PGND",
        "type": "power_in",
        "description": "Power ground return path for 1500 mA maximum gate pull-down current and external temperature sensing transistor."
      },
      {
        "number": "24",
        "name": "GATE",
        "type": "output",
        "description": "High-side gate drive output for external N-channel FET, clamped to maximum 31 V and 14 V above HS± pins, with 10 to 14 V drive voltage at 5 μA load."
      },
      {
        "number": "25",
        "name": "TEMP",
        "type": "input",
        "description": "Remote temperature sensing input for external NPN/PNP transistor measurement via internal 12-bit ADC, with 0.25 °C resolution and ±1 to ±10 °C accuracy."
      },
      {
        "number": "26",
        "name": "MO−",
        "type": "input",
        "description": "Negative power monitor current sense input for 50 V/V amplifier with ±25 mV input range, input current 25 nA maximum at 20 V."
      },
      {
        "number": "27",
        "name": "HS−",
        "type": "input",
        "description": "Negative hot swap current sense input for 50 V/V amplifier with 20 mV default sense limit, input current 150 μA maximum per pin at 20 V."
      },
      {
        "number": "28",
        "name": "HS+",
        "type": "input",
        "description": "Positive hot swap current sense input and supply input voltage measurement point, input current 150 μA maximum per pin at 20 V."
      },
      {
        "number": "29",
        "name": "MO+",
        "type": "input",
        "description": "Positive power monitor current sense input for 50 V/V amplifier with ±25 mV input range, input current 25 nA maximum at 20 V."
      },
      {
        "number": "30",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply input 4.5 to 20 V with quiescent current 5.5 mA; UVLO threshold 2.4 to 2.7 V rising with 90 to 120 mV hysteresis; GATE held low below UVLO."
      },
      {
        "number": "31",
        "name": "UV",
        "type": "input",
        "description": "Undervoltage comparator input with 1.0 V reference threshold (0.99 to 1.01 V for A/AA grade), 45 to 75 mV hysteresis, input current 50 nA at voltages ≤3.6 V."
      },
      {
        "number": "32",
        "name": "OV",
        "type": "input",
        "description": "Overvoltage comparator input with 1.0 V reference threshold (0.99 to 1.01 V for A/AA grade), 45 to 75 mV hysteresis, input current 50 nA at voltages ≤3.6 V."
      },
      {
        "number": "33",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.2",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.2",
        "primary_model": "claude-haiku-4-5-20251001",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-4-6",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: NIC pins (9, 10, 11) are not internally connected; datasheet shows these as placeholder positions in; Exposed pad (EPAD) is documented as thermal dissipation pad that can be connected to ground; this is; ADM1278-1ACPZ-RL MPN specifies A-grade accuracy (±0.7% on power monitoring) per Table 1; confirm if ",
          "exposed pad 33 added from the footprint"
        ],
        "pages_sent": 61,
        "cost_usd": 0.789,
        "at": "2026-09-22T05:29:39"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589803179086426112",
        "pages": 61,
        "sha256": "338e9e8a25e8f22f",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 33,
        "described": 33,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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      "footprint": "viewers/footprint.html"
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        "role": "plain",
        "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": "5fa713ea46b36980895812ed853577889b7cb06d275041a39b99bc0be305dc79",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "adm1278-1acpz-rl-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
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        "sha256": "4586513bcfd0f0eb49216ef0b18b2a69729e412cbfac58fb7568e0acbab2d4a7",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Analog Devices",
      "Package": "LFCSP-32(5x5)",
      "Category": "Circuit Protection",
      "Pins": "33"
    }
  },
  "variants": [],
  "sections": [
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    "info"
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  "discovery_triggers": [
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  "discovery_pitch": "ADM1278-1ACPZ-RL (Analog Devices) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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  "visibility": {
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  "updated_at": "2026-09-24T15:53:10.052Z"
}