component
SN74LS240DBR
Public Made by Adomby adom
Texas Instruments Buffers, Drivers, Receivers, Transceivers, SSOP-20-208mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"package": "SSOP-20-208mil",
"pin_count": 20,
"category": "Logic",
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"name": "1G",
"type": "input",
"description": "Channel 1 output enable; the datasheet describes these G inputs as symmetrical, active-low output-control inputs."
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{
"number": "2",
"name": "1A1",
"type": "input",
"description": "Channel 1 A-side data input 1; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin."
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{
"number": "3",
"name": "2Y4",
"type": "tri_state",
"description": "Channel 2 Y-side three-state output 4; SN74LS24x devices are rated for IOL up to 24 mA."
},
{
"number": "4",
"name": "1A2",
"type": "input",
"description": "Channel 1 A-side data input 2; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin."
},
{
"number": "5",
"name": "2Y3",
"type": "tri_state",
"description": "Channel 2 Y-side three-state output 3; SN74LS24x devices are rated for IOL up to 24 mA."
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{
"number": "6",
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"type": "input",
"description": "Channel 1 A-side data input 3; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin."
},
{
"number": "7",
"name": "2Y2",
"type": "tri_state",
"description": "Channel 2 Y-side three-state output 2; SN74LS24x devices are rated for IOL up to 24 mA."
},
{
"number": "8",
"name": "1A4",
"type": "input",
"description": "Channel 1 A-side data input 4; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin."
},
{
"number": "9",
"name": "2Y1",
"type": "tri_state",
"description": "Channel 2 Y-side three-state output 1; SN74LS24x devices are rated for IOL up to 24 mA."
},
{
"number": "10",
"name": "GND",
"type": "power_in",
"description": "Ground reference; the datasheet states voltages are referenced to the network ground terminal."
},
{
"number": "11",
"name": "2A1",
"type": "input",
"description": "Channel 2 A-side data input 1; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin."
},
{
"number": "12",
"name": "1Y4",
"type": "tri_state",
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},
{
"number": "13",
"name": "2A2",
"type": "input",
"description": "Channel 2 A-side data input 2; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin."
},
{
"number": "14",
"name": "1Y3",
"type": "tri_state",
"description": "Channel 1 Y-side three-state output 3; SN74LS24x devices are rated for IOL up to 24 mA."
},
{
"number": "15",
"name": "2A3",
"type": "input",
"description": "Channel 2 A-side data input 3; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin."
},
{
"number": "16",
"name": "1Y2",
"type": "tri_state",
"description": "Channel 1 Y-side three-state output 2; SN74LS24x devices are rated for IOL up to 24 mA."
},
{
"number": "17",
"name": "2A4",
"type": "input",
"description": "Channel 2 A-side data input 4; the datasheet states inputs are tolerant down to 2 V and have hysteresis for noise margin."
},
{
"number": "18",
"name": "1Y1",
"type": "tri_state",
"description": "Channel 1 Y-side three-state output 1; SN74LS24x devices are rated for IOL up to 24 mA."
},
{
"number": "19",
"name": "2G/2G",
"type": "input",
"description": "Channel 2 output enable; for the SN74LS240 this is the 2G control (the footnote gives 2G/2G for LS241/S241 and 2G for all other drivers), and the datasheet describes these G inputs as active-low output controls."
},
{
"number": "20",
"name": "VCC",
"type": "power_in",
"description": "Power supply; SN74xS24x devices are specified for VCC of 4.75 V to 5.25 V (5 V nominal)."
}
],
"provenance": {
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"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: The pin table on page 3 is shared by the DB, DW, J, N, NS and W packages. The DB (SSOP-20) pinout wa; Text extraction dropped the overbars on the output-enable names. Pin 1 is printed as 1G and pin 19 a; The printed pin table says type O for the Y outputs. I mapped them to KiCad tri_state because the da"
],
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"at": "2026-10-08T16:06:46"
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