component
ULN2804A
Public Made by Adomby adom
STMicroelectronics Darlington Transistor Arrays, DIP-18. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285
{
"schema_version": 1,
"type": "component",
"slug": "uln2804a",
"title": "ULN2804A",
"brief": "STMicroelectronics Darlington Transistor Arrays, DIP-18. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
"tags": [
"component",
"transistors-thyristors",
"uln2804a",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "ULN2804A",
"manufacturer": "STMicroelectronics",
"package": "DIP-18",
"pin_count": 18,
"category": "Transistors/Thyristors",
"subcategory": "Darlington Transistor Arrays",
"datasheet": "https://www.st.com/resource/en/datasheet/uln2804a.pdf",
"parts": {
"symbol": "uln2804a.kicad_sym",
"footprint": "uln2804a.kicad_mod",
"model_3d": "uln2804a-hero.glb",
"model_3d_plain": "uln2804a.glb",
"model_3d_step": "uln2804a-etched.step",
"model_3d_step_plain": "uln2804a.step",
"lbr": "uln2804a.lbr"
},
"distributor_links": {
"lcsc": "C31415",
"digikey": "497-2357-5-ND",
"mouser": "511-ULN2804A"
},
"distributor_check": {
"checked_at": "2026-10-08T00:36:11Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "497-2357-5-ND",
"status": "found",
"lifecycle": "Active"
},
"mouser": {
"pn": "511-ULN2804A",
"status": "found"
}
},
"pins": [
{
"number": "1",
"name": "IN1",
"type": "input",
"description": "Input of Darlington driver 1 (10.5 kΩ input resistor for 6-15 V CMOS/PMOS on ULN2804A), drives OUT1; absolute maximum input voltage 30 V."
},
{
"number": "2",
"name": "IN2",
"type": "input",
"description": "Input of Darlington driver 2 (10.5 kΩ input resistor for 6-15 V CMOS/PMOS on ULN2804A), drives OUT2; absolute maximum input voltage 30 V."
},
{
"number": "3",
"name": "IN3",
"type": "input",
"description": "Input of Darlington driver 3 (10.5 kΩ input resistor for 6-15 V CMOS/PMOS on ULN2804A), drives OUT3; absolute maximum input voltage 30 V."
},
{
"number": "4",
"name": "IN4",
"type": "input",
"description": "Input of Darlington driver 4 (10.5 kΩ input resistor for 6-15 V CMOS/PMOS on ULN2804A), drives OUT4; absolute maximum input voltage 30 V."
},
{
"number": "5",
"name": "IN5",
"type": "input",
"description": "Input of Darlington driver 5 (10.5 kΩ input resistor for 6-15 V CMOS/PMOS on ULN2804A), drives OUT5; absolute maximum input voltage 30 V."
},
{
"number": "6",
"name": "IN6",
"type": "input",
"description": "Input of Darlington driver 6 (10.5 kΩ input resistor for 6-15 V CMOS/PMOS on ULN2804A), drives OUT6; absolute maximum input voltage 30 V."
},
{
"number": "7",
"name": "IN7",
"type": "input",
"description": "Input of Darlington driver 7 (10.5 kΩ input resistor for 6-15 V CMOS/PMOS on ULN2804A), drives OUT7; absolute maximum input voltage 30 V."
},
{
"number": "8",
"name": "IN8",
"type": "input",
"description": "Input of Darlington driver 8 (10.5 kΩ input resistor for 6-15 V CMOS/PMOS on ULN2804A), drives OUT8; absolute maximum input voltage 30 V."
},
{
"number": "9",
"name": "GND",
"type": "power_in",
"description": "Common emitter ground of all eight Darlington transistors."
},
{
"number": "10",
"name": "COMMON",
"type": "passive",
"description": "Common free-wheeling (suppression) diode cathode connection for inductive loads, with clamp diode forward voltage 2 V max at 350 mA."
},
{
"number": "11",
"name": "OUT8",
"type": "output",
"description": "Open-collector Darlington output 8, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state."
},
{
"number": "12",
"name": "OUT7",
"type": "output",
"description": "Open-collector Darlington output 7, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state."
},
{
"number": "13",
"name": "OUT6",
"type": "output",
"description": "Open-collector Darlington output 6, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state."
},
{
"number": "14",
"name": "OUT5",
"type": "output",
"description": "Open-collector Darlington output 5, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state."
},
{
"number": "15",
"name": "OUT4",
"type": "output",
"description": "Open-collector Darlington output 4, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state."
},
{
"number": "16",
"name": "OUT3",
"type": "output",
"description": "Open-collector Darlington output 3, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state."
},
{
"number": "17",
"name": "OUT2",
"type": "output",
"description": "Open-collector Darlington output 2, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state."
},
{
"number": "18",
"name": "OUT1",
"type": "output",
"description": "Open-collector Darlington output 1, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
"factory": "2.0.0",
"extractor": "extract_pins 0.3",
"primary_model": "claude-sonnet-5-5",
"primary_mode": "text+vision",
"consensus_model": "claude-opus-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: Pin type for pin 10 (COMMON free-wheeling diodes) chosen as passive; datasheet only labels it 'COMMO",
"vision extraction: provenance cannot be text-verified; needs consensus"
],
"pages_sent": 14,
"cost_usd": 0.2586,
"at": "2026-10-08T00:35:53"
},
"datasheet": {
"url": "https://www.st.com/resource/en/datasheet/uln2804a.pdf",
"pages": 14,
"sha256": "78d49085c6e74186",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 18,
"described": 18,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
{
"file": "uln2804a.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "body on z = 0, through-hole leads below",
"extents_mm": [
7.874,
22.86,
6.98
],
"zmin_mm": -3.3,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "c9e1ad672f0603e5818e9d0329669eb09ec9fa91bae3fdad8cdfa245e05c3b5f",
"checked": "2026-10-08",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "uln2804a-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "body on z = 0, through-hole leads below",
"extents_mm": [
7.874,
22.86,
6.98
],
"zmin_mm": -3.3,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "e71ae8dcbb50f7ca4cf221e7d111d6d7aebbe0b0de0b7bb18ff0541f7139d7ef",
"checked": "2026-10-08",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
},
"metadata": {
"specs": {
"Manufacturer": "STMicroelectronics",
"Package": "DIP-18",
"Category": "Transistors/Thyristors",
"Pins": "18"
}
},
"variants": [],
"sections": [
"hero",
"viewers",
"readme",
"breadcrumbs",
"info"
],
"discovery_triggers": [
"uln2804a"
],
"discovery_pitch": "ULN2804A (STMicroelectronics) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
"author": {
"name": "Ray",
"email": "[email protected]"
},
"dependencies": {},
"hero": {
"type": "image",
"path": "docs/hero.png"
},
"files": [
"page.json",
"README.md",
"uln2804a.kicad_sym",
"uln2804a.kicad_mod",
"uln2804a.glb",
"uln2804a.step",
"uln2804a.lbr",
"docs/hero.png",
"docs/uln2804a-datasheet.pdf",
"viewers/symbol.html",
"viewers/footprint.html",
"uln2804a-hero.glb",
"uln2804a-hero.overlay.json"
],
"visibility": {
"public": true
}
}