component
SN74LVC646ADBR
Public Made by Adomby adom
Texas Instruments Buffers, Drivers, Receivers, Transceivers, SSOP-24-150mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
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"type": "component",
"slug": "sn74lvc646adbr",
"title": "SN74LVC646ADBR",
"brief": "Texas Instruments Buffers, Drivers, Receivers, Transceivers, SSOP-24-150mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
"tags": [
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"logic",
"sn74lvc646adbr",
"factory-2.0.0",
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],
"component": {
"mpn": "SN74LVC646ADBR",
"manufacturer": "Texas Instruments",
"package": "SSOP-24-150mil",
"pin_count": 24,
"category": "Logic",
"subcategory": "Buffers, Drivers, Receivers, Transceivers",
"datasheet": "https://www.ti.com/cn/lit/gpn/sn74lvc646a",
"parts": {
"symbol": "sn74lvc646adbr.kicad_sym",
"footprint": "sn74lvc646adbr.kicad_mod",
"model_3d": "sn74lvc646adbr-hero.glb",
"model_3d_plain": "sn74lvc646adbr.glb",
"model_3d_step": "sn74lvc646adbr-etched.step",
"model_3d_step_plain": "sn74lvc646adbr.step",
"lbr": "sn74lvc646adbr.lbr"
},
"distributor_links": {
"lcsc": "C2675933",
"digikey": "296-8533-2-ND",
"mouser": "595-SN74LVC646ADBR"
},
"distributor_check": {
"checked_at": "2026-10-11T09:15:13Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "296-8533-2-ND",
"status": "found",
"lifecycle": "Active"
},
"mouser": {
"pn": "595-SN74LVC646ADBR",
"status": "found"
}
},
"pins": [
{
"number": "1",
"name": "CLKAB",
"type": "input",
"description": "Clock input for the A-side registers; data on the A bus is stored on each low-to-high transition of CLKAB."
},
{
"number": "2",
"name": "SAB",
"type": "input",
"description": "Select control for the A-to-B path that multiplexes stored and real-time (transparent) data."
},
{
"number": "3",
"name": "DIR",
"type": "input",
"description": "Direction control that sets which bus receives data when OE is low (low selects B to A, high selects A to B)."
},
{
"number": "4",
"name": "A1",
"type": "bidirectional",
"description": "A-bus port 1 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
},
{
"number": "5",
"name": "A2",
"type": "bidirectional",
"description": "A-bus port 2 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
},
{
"number": "6",
"name": "A3",
"type": "bidirectional",
"description": "A-bus port 3 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
},
{
"number": "7",
"name": "A4",
"type": "bidirectional",
"description": "A-bus port 4 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
},
{
"number": "8",
"name": "A5",
"type": "bidirectional",
"description": "A-bus port 5 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
},
{
"number": "9",
"name": "A6",
"type": "bidirectional",
"description": "A-bus port 6 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
},
{
"number": "10",
"name": "A7",
"type": "bidirectional",
"description": "A-bus port 7 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
},
{
"number": "11",
"name": "A8",
"type": "bidirectional",
"description": "A-bus port 8 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
},
{
"number": "12",
"name": "GND",
"type": "power_in",
"description": "Ground reference; all unused inputs must be held at VCC or GND for proper device operation."
},
{
"number": "13",
"name": "B8",
"type": "bidirectional",
"description": "B-bus port 8 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
},
{
"number": "14",
"name": "B7",
"type": "bidirectional",
"description": "B-bus port 7 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
},
{
"number": "15",
"name": "B6",
"type": "bidirectional",
"description": "B-bus port 6 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
},
{
"number": "16",
"name": "B5",
"type": "bidirectional",
"description": "B-bus port 5 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
},
{
"number": "17",
"name": "B4",
"type": "bidirectional",
"description": "B-bus port 4 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
},
{
"number": "18",
"name": "B3",
"type": "bidirectional",
"description": "B-bus port 3 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
},
{
"number": "19",
"name": "B2",
"type": "bidirectional",
"description": "B-bus port 2 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
},
{
"number": "20",
"name": "B1",
"type": "bidirectional",
"description": "B-bus port 1 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
},
{
"number": "21",
"name": "OE",
"type": "input",
"description": "Active-low output enable; OE high places the A and B outputs in the high-impedance (isolation) state, and it should be tied to VCC through a pullup resistor to keep outputs high-impedance during power up or down."
},
{
"number": "22",
"name": "SBA",
"type": "input",
"description": "Select control for the B-to-A path that multiplexes stored and real-time (transparent) data."
},
{
"number": "23",
"name": "CLKBA",
"type": "input",
"description": "Clock input for the B-side registers; data on the B bus is stored on each low-to-high transition of CLKBA."
},
{
"number": "24",
"name": "VCC",
"type": "power_in",
"description": "Supply voltage; the SN74LVC646A is specified for 1.65 V to 3.6 V operation (operating range)."
}
],
"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 pin-diagram text extraction is garbled. The pin-number mapping was rebuilt from the top-view pin; Page 4 states that the pin numbers apply to the DB, DW, JT, NS, PW and W packages, so the same numbe; The datasheet gives the package as DB, a 24-pin SSOP plastic small-outline package, but it does not "
],
"pages_sent": 21,
"cost_usd": 0.0819,
"at": "2026-10-11T09:14:55"
},
"datasheet": {
"url": "https://www.ti.com/cn/lit/gpn/sn74lvc646a",
"pages": 21,
"sha256": "979e7f444477033e",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 24,
"described": 24,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
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"file": "sn74lvc646adbr.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
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8.2,
2.1
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "77dd0a1fc7e70e9eda1bfde9dde937dc6e391803cff9978790523c850c85a21d",
"checked": "2026-10-11",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "sn74lvc646adbr-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
7.8,
8.2,
2.1
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "12e01b72fef5e687768ca38cf10d21d47fecf58cb18e9c7c0b429aa8cd5f2607",
"checked": "2026-10-11",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
},
"metadata": {
"specs": {
"Manufacturer": "Texas Instruments",
"Package": "SSOP-24-150mil",
"Category": "Logic",
"Pins": "24"
}
},
"variants": [],
"sections": [
"hero",
"viewers",
"readme",
"breadcrumbs",
"info"
],
"discovery_triggers": [
"sn74lvc646adbr"
],
"discovery_pitch": "SN74LVC646ADBR (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
"author": {
"name": "Ray",
"email": "[email protected]"
},
"dependencies": {},
"hero": {
"type": "image",
"path": "docs/hero.png"
},
"files": [
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"sn74lvc646adbr.lbr",
"docs/hero.png",
"docs/sn74lvc646adbr-datasheet.pdf",
"viewers/symbol.html",
"viewers/footprint.html",
"sn74lvc646adbr-hero.glb",
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],
"visibility": {
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}
}