component
SN74HC240 Inverting Octal Buffer
Public Made by Adomby adom
Octal inverting buffer and line driver with 3-state outputs in two 4-bit banks.
main
Ray
sn74hc240: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding)
65aa82b
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{
"schema_version": 1,
"type": "component",
"slug": "sn74hc240",
"title": "SN74HC240 Inverting Octal Buffer",
"brief": "Octal inverting buffer and line driver with 3-state outputs in two 4-bit banks.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
"tags": [
"logic",
"buffer",
"inverting",
"line-driver",
"3-state",
"74hc",
"ti",
"soic-20"
],
"component": {
"mpn": "SN74HC240",
"manufacturer": "Texas Instruments",
"package": "SOIC-20",
"pin_count": 20,
"category": "Logic",
"subcategory": "Buffer / Line Driver",
"datasheet": "https://www.ti.com/lit/ds/symlink/sn74hc240.pdf",
"parts": {
"symbol": "sn74hc240.kicad_sym",
"footprint": "sn74hc240.kicad_mod",
"model_3d": "sn74hc240-etched.glb",
"model_3d_plain": "sn74hc240.glb",
"lbr": "sn74hc240.lbr",
"model_3d_step": "sn74hc240-etched.step",
"model_3d_step_plain": "sn74hc240.step"
},
"distributor_links": {},
"pins": [
{
"number": "1",
"name": "1OE",
"type": "input",
"description": "Active-low output enable for bank 1 (drives 1Y1-1Y4). Low = outputs active (inverted A data); high = outputs in high-impedance state."
},
{
"number": "2",
"name": "1A1",
"type": "input",
"description": "Bank-1 data input 1; drives inverted onto 1Y1 when 1OE is low."
},
{
"number": "3",
"name": "2Y4",
"type": "tri_state",
"description": "Bank-2 buffered output 4 (inverted 2A4). High-impedance when 2OE is high."
},
{
"number": "4",
"name": "1A2",
"type": "input",
"description": "Bank-1 data input 2; drives inverted onto 1Y2 when 1OE is low."
},
{
"number": "5",
"name": "2Y3",
"type": "tri_state",
"description": "Bank-2 buffered output 3 (inverted 2A3). High-impedance when 2OE is high."
},
{
"number": "6",
"name": "1A3",
"type": "input",
"description": "Bank-1 data input 3; drives inverted onto 1Y3 when 1OE is low."
},
{
"number": "7",
"name": "2Y2",
"type": "tri_state",
"description": "Bank-2 buffered output 2 (inverted 2A2). High-impedance when 2OE is high."
},
{
"number": "8",
"name": "1A4",
"type": "input",
"description": "Bank-1 data input 4; drives inverted onto 1Y4 when 1OE is low."
},
{
"number": "9",
"name": "2Y1",
"type": "tri_state",
"description": "Bank-2 buffered output 1 (inverted 2A1). High-impedance when 2OE is high."
},
{
"number": "10",
"name": "GND",
"type": "power_in",
"description": "Ground reference (0 V)."
},
{
"number": "11",
"name": "2A1",
"type": "input",
"description": "Bank-2 data input 1; drives inverted onto 2Y1 when 2OE is low."
},
{
"number": "12",
"name": "1Y4",
"type": "tri_state",
"description": "Bank-1 buffered output 4 (inverted 1A4). High-impedance when 1OE is high."
},
{
"number": "13",
"name": "2A2",
"type": "input",
"description": "Bank-2 data input 2; drives inverted onto 2Y2 when 2OE is low."
},
{
"number": "14",
"name": "1Y3",
"type": "tri_state",
"description": "Bank-1 buffered output 3 (inverted 1A3). High-impedance when 1OE is high."
},
{
"number": "15",
"name": "2A3",
"type": "input",
"description": "Bank-2 data input 3; drives inverted onto 2Y3 when 2OE is low."
},
{
"number": "16",
"name": "1Y2",
"type": "tri_state",
"description": "Bank-1 buffered output 2 (inverted 1A2). High-impedance when 1OE is high."
},
{
"number": "17",
"name": "2A4",
"type": "input",
"description": "Bank-2 data input 4; drives inverted onto 2Y4 when 2OE is low."
},
{
"number": "18",
"name": "1Y1",
"type": "tri_state",
"description": "Bank-1 buffered output 1 (inverted 1A1). High-impedance when 1OE is high."
},
{
"number": "19",
"name": "2OE",
"type": "input",
"description": "Active-low output enable for bank 2 (drives 2Y1-2Y4). Low = outputs active (inverted A data); high = outputs in high-impedance state."
},
{
"number": "20",
"name": "VCC",
"type": "power_in",
"description": "Positive supply, 2 V to 6 V recommended operating range."
}
],
"provenance": {
"extractor": "ds2sf",
"datasheet": {
"url": "https://www.ti.com/lit/ds/symlink/sn74hc240.pdf",
"pages": 35,
"sha256": "5d711e6c13cd01a1",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 20,
"described": 20,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"logic": {
"family_id": "74HC240",
"logic_family": "74HC",
"function_code": "240",
"function_class": "Buffer",
"function_name": "Octal Buffer/Driver, Inverting, 3-State",
"manufacturer": "Texas Instruments",
"is_specialty": false
},
"models_3d": [
{
"file": "sn74hc240.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
10.3,
12.8,
2.75
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "59a10b341e6972b31d81802a048060326da627d8b92dcf4263064f4f62ec808e",
"checked": "2026-10-07",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "sn74hc240-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
10.3,
12.8,
2.75
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "0ece900f75732faca79dff594e23e7d7fc4a3d4b248e0c947c93bec7db0212db",
"checked": "2026-10-07",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
},
"metadata": {
"specs": {
"Type": "Octal inverting buffer / line driver, 3-state",
"Logic family": "74HC (CMOS)",
"Configuration": "8 inverting buffers, two 4-bit banks",
"Supply voltage": "2 V to 6 V",
"Output current": "+-6 mA at VCC = 4.5 V",
"Propagation delay": "11 ns typ at 5 V",
"Operating temperature": "-40 C to 85 C"
}
},
"sections": [
"hero",
"viewers",
"readme",
"breadcrumbs",
"info"
],
"discovery_triggers": [
"inverting buffer",
"octal buffer",
"bus driver",
"3-state inverter"
],
"discovery_pitch": "Eight inverting 3-state buffers in two independently enabled 4-bit banks for driving or isolating buses.",
"author": {
"name": "Ray"
},
"dependencies": {},
"hero": {
"type": "image",
"path": "docs/hero.png"
},
"files": [
"page.json",
"README.md",
"sn74hc240.kicad_sym",
"sn74hc240.kicad_mod",
"sn74hc240.glb",
"sn74hc240.lbr",
"docs/hero.png",
"docs/sn74hc240-datasheet.pdf",
"viewers/symbol.html",
"viewers/footprint.html",
"sn74hc240-etched.step"
],
"variants": [
{
"mpn": "SN74HC240DW",
"kind": "unknown"
},
{
"mpn": "SN74HC240DB",
"kind": "unknown"
},
{
"mpn": "SN74HC240DGS",
"kind": "unknown"
},
{
"mpn": "SN74HC240N",
"kind": "unknown"
},
{
"mpn": "SN74HC240NS",
"kind": "unknown"
},
{
"mpn": "SN74HC240PW",
"kind": "unknown"
},
{
"mpn": "SN74HC240J",
"kind": "unknown"
},
{
"mpn": "SN74HC240FK",
"kind": "unknown"
},
{
"mpn": "SN74HC240W",
"kind": "unknown"
}
]
}