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.
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README.mdadded+54@@ -0,0 +1,54 @@+# ULN2804A++**STMicroelectronics** · Darlington Transistor Arrays · DIP-18++ULN2804A from STMicroelectronics, in a DIP-18. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | IN1 | input | 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. |+| 2 | IN2 | input | 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. |+| 3 | IN3 | input | 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. |+| 4 | IN4 | input | 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. |+| 5 | IN5 | input | 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. |+| 6 | IN6 | input | 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. |+| 7 | IN7 | input | 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. |+| 8 | IN8 | input | 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. |+| 9 | GND | power_in | Common emitter ground of all eight Darlington transistors. |+| 10 | COMMON | passive | Common free-wheeling (suppression) diode cathode connection for inductive loads, with clamp diode forward voltage 2 V max at 350 mA. |+| 11 | OUT8 | output | Open-collector Darlington output 8, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state. |+| 12 | OUT7 | output | Open-collector Darlington output 7, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state. |+| 13 | OUT6 | output | Open-collector Darlington output 6, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state. |+| 14 | OUT5 | output | Open-collector Darlington output 5, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state. |+| 15 | OUT4 | output | Open-collector Darlington output 4, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state. |+| 16 | OUT3 | output | Open-collector Darlington output 3, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state. |+| 17 | OUT2 | output | Open-collector Darlington output 2, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state. |+| 18 | OUT1 | output | Open-collector Darlington output 1, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | STMicroelectronics |+| Package | DIP-18 |+| Category | Transistors/Thyristors |+| Pins | 18 |++## CAD (KiCad official)++- Symbol: `ULN2804A`+- Footprint: `Package_DIP:DIP-18_W7.62mm`+- 3D model: DIP-18 (KiCad packages3D, STEP)+- 3D model files: `uln2804a-etched.step` / `uln2804a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `uln2804a.step` / `uln2804a.glb` are the bare package body.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [STMicroelectronics datasheet](https://www.st.com/resource/en/datasheet/uln2804a.pdf) (14 pp, sha256 `78d49085c6e74186`, retrieved 2026-10-08, tier: manufacturer)+- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/uln2804a-datasheet.pdf)
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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)"+ }+ ]+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}