component
74HC540D
Public Made by Adomby adom
Nexperia Buffers, Drivers, Receivers, Transceivers, SOIC-20-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
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"viewers/footprint.html",
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"component": {
"mpn": "74HC540D",
"manufacturer": "Nexperia",
"package": "SOIC-20-300mil",
"pin_count": 20,
"category": "Logic",
"subcategory": "Buffers, Drivers, Receivers, Transceivers",
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},
"distributor_links": {
"lcsc": "C455072",
"digikey": "264-74HC540DTR-ND",
"mouser": "757-74HC540D"
},
"distributor_check": {
"checked_at": "2026-10-19T04:59:11Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "264-74HC540DTR-ND",
"status": "found",
"lifecycle": "Obsolete"
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"pins": [
{
"number": "1",
"name": "OE1",
"type": "input",
"description": "Output enable 1, active LOW; a HIGH on OE1 causes outputs Y0 to Y7 to assume the high-impedance OFF-state."
},
{
"number": "2",
"name": "A0",
"type": "input",
"description": "Data input A0 of the inverting buffer; clamp diodes permit current-limited resistors to interface this input to voltages above VCC."
},
{
"number": "3",
"name": "A1",
"type": "input",
"description": "Data input A1 of the inverting buffer; clamp diodes permit current-limited resistors to interface this input to voltages above VCC."
},
{
"number": "4",
"name": "A2",
"type": "input",
"description": "Data input A2 of the inverting buffer; clamp diodes permit current-limited resistors to interface this input to voltages above VCC."
},
{
"number": "5",
"name": "A3",
"type": "input",
"description": "Data input A3 of the inverting buffer; clamp diodes permit current-limited resistors to interface this input to voltages above VCC."
},
{
"number": "6",
"name": "A4",
"type": "input",
"description": "Data input A4 of the inverting buffer; clamp diodes permit current-limited resistors to interface this input to voltages above VCC."
},
{
"number": "7",
"name": "A5",
"type": "input",
"description": "Data input A5 of the inverting buffer; clamp diodes permit current-limited resistors to interface this input to voltages above VCC."
},
{
"number": "8",
"name": "A6",
"type": "input",
"description": "Data input A6 of the inverting buffer; clamp diodes permit current-limited resistors to interface this input to voltages above VCC."
},
{
"number": "9",
"name": "A7",
"type": "input",
"description": "Data input A7 of the inverting buffer; clamp diodes permit current-limited resistors to interface this input to voltages above VCC."
},
{
"number": "10",
"name": "GND",
"type": "power_in",
"description": "Ground, 0 V reference for all voltages on the device."
},
{
"number": "11",
"name": "Y7",
"type": "tri_state",
"description": "Inverting 3-state data output Y7 (complement of A7); high-impedance when OE1 or OE2 is HIGH, output current limited to ±35 mA."
},
{
"number": "12",
"name": "Y6",
"type": "tri_state",
"description": "Inverting 3-state data output Y6 (complement of A6); high-impedance when OE1 or OE2 is HIGH, output current limited to ±35 mA."
},
{
"number": "13",
"name": "Y5",
"type": "tri_state",
"description": "Inverting 3-state data output Y5 (complement of A5); high-impedance when OE1 or OE2 is HIGH, output current limited to ±35 mA."
},
{
"number": "14",
"name": "Y4",
"type": "tri_state",
"description": "Inverting 3-state data output Y4 (complement of A4); high-impedance when OE1 or OE2 is HIGH, output current limited to ±35 mA."
},
{
"number": "15",
"name": "Y3",
"type": "tri_state",
"description": "Inverting 3-state data output Y3 (complement of A3); high-impedance when OE1 or OE2 is HIGH, output current limited to ±35 mA."
},
{
"number": "16",
"name": "Y2",
"type": "tri_state",
"description": "Inverting 3-state data output Y2 (complement of A2); high-impedance when OE1 or OE2 is HIGH, output current limited to ±35 mA."
},
{
"number": "17",
"name": "Y1",
"type": "tri_state",
"description": "Inverting 3-state data output Y1 (complement of A1); high-impedance when OE1 or OE2 is HIGH, output current limited to ±35 mA."
},
{
"number": "18",
"name": "Y0",
"type": "tri_state",
"description": "Inverting 3-state data output Y0 (complement of A0); high-impedance when OE1 or OE2 is HIGH, output current limited to ±35 mA."
},
{
"number": "19",
"name": "OE2",
"type": "input",
"description": "Output enable 2, active LOW; a HIGH on OE2 causes outputs Y0 to Y7 to assume the high-impedance OFF-state."
},
{
"number": "20",
"name": "VCC",
"type": "power_in",
"description": "Supply voltage: 2.0 V to 6.0 V for 74HC540 and 4.5 V to 5.5 V for 74HCT540 (recommended operating conditions)."
}
],
"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 describes the outputs as 3-state but does not give a pin-type label; I classified Y0 t; Table 2 says the output enables are active LOW, but the datasheet gives no explicit electrical input"
],
"pages_sent": 16,
"cost_usd": 0.0857,
"at": "2026-10-19T04:57:34"
},
"datasheet": {
"url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588907874914848768",
"pages": 16,
"sha256": "362e8dff06e2d72f",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
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"described": 20,
"cites_pages": true,
"refuses_to_fabricate": true
}
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