component
74LCX257MTCX
Public Made by Adomby adom
onsemi Signal Switches, Multiplexers, Decoders, TSSOP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"title": "74LCX257MTCX",
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"mpn": "74LCX257MTCX",
"manufacturer": "onsemi",
"package": "TSSOP-16",
"pin_count": 16,
"category": "Logic",
"subcategory": "Signal Switches, Multiplexers, Decoders",
"datasheet": "https://www.onsemi.com/pdf/datasheet/74lcx257mtcx-d.pdf",
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"distributor_links": {
"lcsc": "C903361",
"digikey": "74LCX257MTCXTR-ND",
"mouser": "512-74LCX257MTCX"
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{
"number": "1",
"name": "S",
"type": "input",
"description": "Common Data Select input: LOW selects the I0x inputs and HIGH selects the I1x inputs."
},
{
"number": "2",
"name": "I0a",
"type": "input",
"description": "Data input from Source 0 for channel a, selected when S is LOW."
},
{
"number": "3",
"name": "I1a",
"type": "input",
"description": "Data input from Source 1 for channel a, selected when S is HIGH."
},
{
"number": "4",
"name": "Za",
"type": "tri_state",
"description": "3-STATE multiplexer output for channel a, high impedance when OE is HIGH."
},
{
"number": "5",
"name": "I0b",
"type": "input",
"description": "Data input from Source 0 for channel b, selected when S is LOW."
},
{
"number": "6",
"name": "I1b",
"type": "input",
"description": "Data input from Source 1 for channel b, selected when S is HIGH."
},
{
"number": "7",
"name": "Zb",
"type": "tri_state",
"description": "3-STATE multiplexer output for channel b, high impedance when OE is HIGH."
},
{
"number": "8",
"name": "GND",
"type": "power_in",
"description": "Ground pin."
},
{
"number": "9",
"name": "Zd",
"type": "tri_state",
"description": "3-STATE multiplexer output for channel d, high impedance when OE is HIGH."
},
{
"number": "10",
"name": "I1d",
"type": "input",
"description": "Data input from Source 1 for channel d, selected when S is HIGH."
},
{
"number": "11",
"name": "I0d",
"type": "input",
"description": "Data input from Source 0 for channel d, selected when S is LOW."
},
{
"number": "12",
"name": "Zc",
"type": "tri_state",
"description": "3-STATE multiplexer output for channel c, high impedance when OE is HIGH."
},
{
"number": "13",
"name": "I1c",
"type": "input",
"description": "Data input from Source 1 for channel c, selected when S is HIGH."
},
{
"number": "14",
"name": "I0c",
"type": "input",
"description": "Data input from Source 0 for channel c, selected when S is LOW."
},
{
"number": "15",
"name": "OE",
"type": "input",
"description": "Active-low 3-STATE output enable input: a HIGH level forces the outputs to high impedance."
},
{
"number": "16",
"name": "VCC",
"type": "power_in",
"description": "Supply voltage pin, operating range 2.0 V to 3.6 V."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
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"extractor": "extract_pins 0.3",
"primary_model": "claude-sonnet-5-5",
"primary_mode": "vision",
"consensus_model": "claude-opus-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: The datasheet has no text layer and the connection diagram was read from a page image. The diagram s; The datasheet shows one connection diagram for all three 16-pin packages (SOIC, SOP, TSSOP). It was ; The datasheet does not state pin electrical types. Types were inferred from the pin descriptions: S ",
"vision extraction: provenance cannot be text-verified; needs consensus"
],
"pages_sent": 11,
"cost_usd": 0.1941,
"at": "2026-10-27T22:07:22"
},
"datasheet": {
"url": "https://www.onsemi.com/pdf/datasheet/74lcx257mtcx-d.pdf",
"pages": 11,
"sha256": "f4ca62b37784aeca",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 16,
"described": 16,
"cites_pages": true,
"refuses_to_fabricate": true
}
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"metadata": {
"specs": {
"Manufacturer": "onsemi",
"Package": "TSSOP-16",
"Category": "Logic",
"Pins": "16"
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"author": {
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"email": "[email protected]"
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