component
LMH6521SQ
Public Made by Adomby adom
Texas Instruments Special Purpose Amplifiers, WQFN-32-EP(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
"type": "component",
"slug": "lmh6521sq",
"title": "LMH6521SQ",
"brief": "Texas Instruments Special Purpose Amplifiers, WQFN-32-EP(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",
"operational amplifier-comparator",
"lmh6521sq",
"factory-2.0.0",
"extractor-text"
],
"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": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
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"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
5,
5,
0.875
],
"zmin_mm": 0,
"centre_offset_mm": 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",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
5,
5,
0.875
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "a2cf9d65cd1257a3a69ff4099bcb2ee95590e4c434e25941e877f487b9a4025c",
"checked": "2026-10-11",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
},
"metadata": {
"specs": {
"Manufacturer": "Texas Instruments",
"Package": "WQFN-32-EP(5x5)",
"Category": "Operational Amplifier/Comparator",
"Pins": "33"
}
},
"variants": [],
"sections": [
"hero",
"viewers",
"readme",
"breadcrumbs",
"info"
],
"discovery_triggers": [
"lmh6521sq"
],
"discovery_pitch": "LMH6521SQ (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
"author": {
"name": "Ray",
"email": "[email protected]"
},
"dependencies": {},
"hero": {
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"path": "docs/hero.png"
},
"files": [
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"docs/lmh6521sq-datasheet.pdf",
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"visibility": {
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}
}