LMH6521SQ

{
  "slug": "lmh6521sq",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments Special Purpose Amplifiers, WQFN-32-EP(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "operational amplifier-comparator",
    "lmh6521sq",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
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    "README.md",
    "lmh6521sq.kicad_sym",
    "lmh6521sq.kicad_mod",
    "lmh6521sq.glb",
    "lmh6521sq.step",
    "lmh6521sq.lbr",
    "docs/hero.png",
    "docs/lmh6521sq-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lmh6521sq-hero.glb",
    "lmh6521sq-hero.overlay.json"
  ],
  "component": {
    "mpn": "LMH6521SQ",
    "manufacturer": "Texas Instruments",
    "package": "WQFN-32-EP(5x5)",
    "pin_count": 33,
    "category": "Operational Amplifier/Comparator",
    "subcategory": "Special Purpose Amplifiers",
    "datasheet": "https://www.ti.com/cn/lit/gpn/lmh6521",
    "parts": {
      "symbol": "lmh6521sq.kicad_sym",
      "footprint": "lmh6521sq.kicad_mod",
      "model_3d": "lmh6521sq-hero.glb",
      "model_3d_plain": "lmh6521sq.glb",
      "model_3d_step": "lmh6521sq-etched.step",
      "model_3d_step_plain": "lmh6521sq.step",
      "lbr": "lmh6521sq.lbr"
    },
    "distributor_links": {
      "lcsc": "C701922"
    },
    "distributor_check": {
      "checked_at": "2026-10-11T23:19:15Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "A3/SDI/DNA",
        "type": "input",
        "description": "Parallel mode A3 is attenuation bit three (4-dB step), serial mode SDI is serial data in (SPI), and pulse mode DNA is the down pulse pin where a logic 0 pulse decreases gain one step; pulsing with pin 2 resets gain to maximum."
      },
      {
        "number": "2",
        "name": "A4/CLK/UPA",
        "type": "input",
        "description": "Parallel mode A4 is attenuation bit four (8-dB step), serial mode CLK is the serial clock (SPI), and pulse mode UPA is the up pulse pin where a logic 0 pulse increases gain one step; pulsing with pin 1 resets gain to maximum."
      },
      {
        "number": "3",
        "name": "A5",
        "type": "input",
        "description": "Attenuation bit five (16-dB step) in parallel mode; unused in serial and pulse modes and connected to DC ground."
      },
      {
        "number": "4",
        "name": "MOD0",
        "type": "input",
        "description": "Digital mode control pin that floats to logic high if unconnected; set with MOD1 to select parallel, serial or pulse mode (MOD0=0 in serial mode)."
      },
      {
        "number": "5",
        "name": "MOD1",
        "type": "input",
        "description": "Digital mode control pin that floats to logic high if unconnected; set with MOD0 to select parallel, serial or pulse mode (MOD1=0 in pulse mode)."
      },
      {
        "number": "6",
        "name": "B5",
        "type": "input",
        "description": "Attenuation bit five (16-dB step) for channel B in parallel mode; unused in serial and pulse modes and connected to DC ground."
      },
      {
        "number": "7",
        "name": "B4/UPB",
        "type": "input",
        "description": "Parallel mode B4 is attenuation bit four (8-dB step) and pulse mode UPB is the up pulse pin (logic 0 pulse increases gain one step); pulsing with pin 8 resets gain to maximum; connect to DC ground in serial mode."
      },
      {
        "number": "8",
        "name": "B3/DNB",
        "type": "input",
        "description": "Parallel mode B3 is attenuation bit three (4-dB step) and pulse mode DNB is the down pulse pin (logic 0 pulse decreases gain one step); pulsing with pin 7 resets gain to maximum; connect to DC ground in serial mode."
      },
      {
        "number": "9",
        "name": "B2/S1B",
        "type": "input",
        "description": "Parallel mode B2 is attenuation bit two (2-dB step) and pulse mode S1B is step size bit 1 ((0,0)=0.5 dB, (0,1)=1 dB, (1,0)=2 dB, (1,1)=6 dB); connect to DC ground in serial mode."
      },
      {
        "number": "10",
        "name": "B1/S0B",
        "type": "input",
        "description": "Parallel mode B1 is attenuation bit one (1-dB step) and pulse mode S0B is step size bit 0 ((0,0)=0.5 dB, (0,1)=1 dB, (1,0)=2 dB, (1,1)=6 dB); connect to DC ground in serial mode."
      },
      {
        "number": "11",
        "name": "INB+",
        "type": "input",
        "description": "Channel B noninverting amplifier input, internally biased to mid supply; input voltage must not exceed V+ or go below GND by more than 0.5 V."
      },
      {
        "number": "12",
        "name": "INB-",
        "type": "input",
        "description": "Channel B inverting amplifier input, internally biased to mid supply; input voltage must not exceed V+ or go below GND by more than 0.5 V."
      },
      {
        "number": "13",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin to connect to a low impedance ground plane; all pin voltages are specified with respect to these pins and the exposed pad is internally bonded to them."
      },
      {
        "number": "14",
        "name": "+5V",
        "type": "power_in",
        "description": "Power supply pin with a valid range of 4.75 V to 5.25 V."
      },
      {
        "number": "15",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin to connect to a low impedance ground plane; all pin voltages are specified with respect to these pins and the exposed pad is internally bonded to them."
      },
      {
        "number": "16",
        "name": "B0",
        "type": "input",
        "description": "Attenuation bit zero (0.5-dB step) for channel B in parallel mode, where 000000 is maximum gain; connect to DC ground in serial and pulse modes."
      },
      {
        "number": "17",
        "name": "OUTB+",
        "type": "output",
        "description": "Channel B noninverting amplifier output, externally biased to 0 V."
      },
      {
        "number": "18",
        "name": "OUTB-",
        "type": "output",
        "description": "Channel B inverting amplifier output, externally biased to 0 V."
      },
      {
        "number": "19",
        "name": "ENB",
        "type": "input",
        "description": "Channel B enable pin, logic 1 = enabled state; floats high if left unconnected."
      },
      {
        "number": "20",
        "name": "LATB",
        "type": "input",
        "description": "Channel B latch pin in parallel mode (logic 0 = active, logic 1 = latched, gain unchanged once high); connect to ground if latch is not desired or in serial and pulse modes."
      },
      {
        "number": "21",
        "name": "LATA",
        "type": "input",
        "description": "Channel A latch pin in parallel mode (logic 0 = active, logic 1 = latched, gain unchanged once high); connect to ground if latch is not desired or in serial and pulse modes."
      },
      {
        "number": "22",
        "name": "ENA",
        "type": "input",
        "description": "Channel A enable pin, logic 1 = enabled state; floats high if left unconnected."
      },
      {
        "number": "23",
        "name": "OUTA-",
        "type": "output",
        "description": "Channel A inverting amplifier output, externally biased to 0 V."
      },
      {
        "number": "24",
        "name": "OUTA+",
        "type": "output",
        "description": "Channel A noninverting amplifier output, externally biased to 0 V."
      },
      {
        "number": "25",
        "name": "A0",
        "type": "input",
        "description": "Attenuation bit zero (0.5-dB step) for channel A in parallel mode, where 000000 is maximum gain; connect to DC ground in pulse mode and leave NC in serial mode per Table 1."
      },
      {
        "number": "26",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin to connect to a low impedance ground plane; all pin voltages are specified with respect to these pins and the exposed pad is internally bonded to them."
      },
      {
        "number": "27",
        "name": "+5V",
        "type": "power_in",
        "description": "Power supply pin with a valid range of 4.75 V to 5.25 V."
      },
      {
        "number": "28",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin to connect to a low impedance ground plane; all pin voltages are specified with respect to these pins and the exposed pad is internally bonded to them."
      },
      {
        "number": "29",
        "name": "INA-",
        "type": "input",
        "description": "Channel A inverting amplifier input, internally biased to mid supply; input voltage must not exceed V+ or go below GND by more than 0.5 V."
      },
      {
        "number": "30",
        "name": "INA+",
        "type": "input",
        "description": "Channel A noninverting amplifier input, internally biased to mid supply; input voltage must not exceed V+ or go below GND by more than 0.5 V."
      },
      {
        "number": "31",
        "name": "A1/SDO/S0A",
        "type": "input",
        "description": "Parallel mode A1 is attenuation bit one (1-dB step), serial mode SDO is serial data out (SPI), and pulse mode S0A is step size bit 0 ((0,0)=0.5 dB, (0,1)=1 dB, (1,0)=2 dB, (1,1)=6 dB)."
      },
      {
        "number": "32",
        "name": "A2/CS/S1A",
        "type": "input",
        "description": "Parallel mode A2 is attenuation bit two (2-dB step), serial mode CS is the active-low chip select (SPI), and pulse mode S1A is step size bit 1 ((0,0)=0.5 dB, (0,1)=1 dB, (1,0)=2 dB, (1,1)=6 dB)."
      },
      {
        "number": "33",
        "name": "GND",
        "type": "power_in",
        "description": "Exposed thermal pad, connect to a low impedance ground plane; it is internally bonded to the ground pins."
      }
    ],
    "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 datasheet's pin table labels pin 31 as type I, but its SDO function is a driven output (open-col; The exposed thermal pad is described in the text as internally bonded to the ground pins but is not ; These pins are multi-function and their names depend on the MOD0/MOD1 strapping (parallel, serial SP",
          "exposed pad 33 added from the footprint"
        ],
        "pages_sent": 17,
        "cost_usd": 0.1101,
        "at": "2026-10-11T23:18:59"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/lmh6521",
        "pages": 38,
        "sha256": "73c886f243e5aa0c",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 33,
        "described": 33,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
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      "footprint": "viewers/footprint.html"
    },
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        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
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        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "5fa713ea46b36980895812ed853577889b7cb06d275041a39b99bc0be305dc79",
        "checked": "2026-10-11",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lmh6521sq-etched.step",
        "role": "eda",
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        "units": "mm",
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  }
}