component
SN74AHCT138DR
Public Made by Adomby adom
Texas Instruments Signal Switches, Multiplexers, Decoders, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"manufacturer": "Texas Instruments",
"package": "SOIC-16",
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"category": "Logic",
"subcategory": "Signal Switches, Multiplexers, Decoders",
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"distributor_links": {
"lcsc": "C354153",
"digikey": "296-14701-2-ND",
"mouser": "595-SN74AHCT138DR"
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"checked_at": "2026-10-08T03:19:56Z",
"source": "Component Ocean /api/assign-pns",
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"status": "found",
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"pins": [
{
"number": "1",
"name": "A",
"type": "input",
"description": "Address input A of the 3-line to 8-line decoder; inputs are TTL-voltage compatible and must not be left floating."
},
{
"number": "2",
"name": "B",
"type": "input",
"description": "Address input B of the 3-line to 8-line decoder; inputs are TTL-voltage compatible and must not be left floating."
},
{
"number": "3",
"name": "C",
"type": "input",
"description": "Address input C of the 3-line to 8-line decoder; inputs are TTL-voltage compatible and must not be left floating."
},
{
"number": "4",
"name": "G2A",
"type": "input",
"description": "Strobe (enable) input 2A, active low, used with G2B and G1 to enable the decoder outputs."
},
{
"number": "5",
"name": "G2B",
"type": "input",
"description": "Strobe (enable) input 2B, active low, used with G2A and G1 to enable the decoder outputs."
},
{
"number": "6",
"name": "G1",
"type": "input",
"description": "Strobe (enable) input G1, used with G2A and G2B to enable the decoder outputs."
},
{
"number": "7",
"name": "Y7",
"type": "output",
"description": "Decoder output 7, driven by the 3-line to 8-line decode of inputs A, B and C when enabled."
},
{
"number": "8",
"name": "GND",
"type": "power_in",
"description": "Ground reference for the device."
},
{
"number": "9",
"name": "Y6",
"type": "output",
"description": "Decoder output 6, driven by the 3-line to 8-line decode of inputs A, B and C when enabled."
},
{
"number": "10",
"name": "Y5",
"type": "output",
"description": "Decoder output 5, driven by the 3-line to 8-line decode of inputs A, B and C when enabled."
},
{
"number": "11",
"name": "Y4",
"type": "output",
"description": "Decoder output 4, driven by the 3-line to 8-line decode of inputs A, B and C when enabled."
},
{
"number": "12",
"name": "Y3",
"type": "output",
"description": "Decoder output 3, driven by the 3-line to 8-line decode of inputs A, B and C when enabled."
},
{
"number": "13",
"name": "Y2",
"type": "output",
"description": "Decoder output 2, driven by the 3-line to 8-line decode of inputs A, B and C when enabled."
},
{
"number": "14",
"name": "Y1",
"type": "output",
"description": "Decoder output 1, driven by the 3-line to 8-line decode of inputs A, B and C when enabled."
},
{
"number": "15",
"name": "Y0",
"type": "output",
"description": "Decoder output 0, driven by the 3-line to 8-line decode of inputs A, B and C when enabled."
},
{
"number": "16",
"name": "VCC",
"type": "power_in",
"description": "Positive supply; recommended supply range is 1.5 V to 5.5 V and each VCC terminal should have a bypass capacitor (0.1 µF recommended)."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
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"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 table (Table 3-1) gives pin numbers for the shared D/DB/DGV/N/NS/PW pinout with no package-s; Output descriptions are generalized from the pin function table, which says only 'Output N'; the dat; VCC type is power_in per KiCad ERC convention for supply pins; the datasheet labels it 'P' (Power). "
],
"pages_sent": 11,
"cost_usd": 0.0602,
"at": "2026-10-08T03:19:38"
},
"datasheet": {
"url": "https://www.ti.com/lit/ds/symlink/sn74ahct138.pdf",
"pages": 40,
"sha256": "e1c16c1f6e6b2f98",
"source_tier": "mfr"
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"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
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"described": 16,
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"sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",
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"metadata": {
"specs": {
"Manufacturer": "Texas Instruments",
"Package": "SOIC-16",
"Category": "Logic",
"Pins": "16"
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"discovery_pitch": "SN74AHCT138DR (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
"author": {
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"email": "[email protected]"
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