ULN2004A Darlington Array

@@ -0,0 +1,66 @@+# ULN2004A++**Texas Instruments** · Transistor Array / Driver · SOIC-16++The ULN2004A is an array of seven NPN Darlington pairs with high-voltage, high-current outputs and common-cathode clamp diodes. Its input resistors are sized for 6 V to 15 V CMOS or PMOS logic (versus the 5 V TTL of the ULN2003A). Each channel sinks up to 500 mA at 50 V, driving relays, solenoids, stepper motors, and LED banks.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | 1B | input | Channel 1 Darlington base input. CMOS/logic-level input (10.5kΩ series base resistor); accepts 6V-15V logic. |+| 2 | 2B | input | Channel 2 Darlington base input. CMOS/logic-level input (10.5kΩ series base resistor). |+| 3 | 3B | input | Channel 3 Darlington base input. CMOS/logic-level input (10.5kΩ series base resistor). |+| 4 | 4B | input | Channel 4 Darlington base input. CMOS/logic-level input (10.5kΩ series base resistor). |+| 5 | 5B | input | Channel 5 Darlington base input. CMOS/logic-level input (10.5kΩ series base resistor). |+| 6 | 6B | input | Channel 6 Darlington base input. CMOS/logic-level input (10.5kΩ series base resistor). |+| 7 | 7B | input | Channel 7 Darlington base input. CMOS/logic-level input (10.5kΩ series base resistor). |+| 8 | E | power_in | Common emitter shared by all seven Darlington channels. Typically tied to ground; all voltages are referenced to this terminal. |+| 9 | COM | power_in | Common cathode node for the seven flyback (freewheeling) clamp diodes. Required for switching inductive loads - connect to the load supply rail. |+| 10 | 7C | output | Channel 7 Darlington open-collector output. Sinks up to 500mA at collector-emitter voltages up to 50V. |+| 11 | 6C | output | Channel 6 Darlington open-collector output. Sinks up to 500mA at up to 50V. |+| 12 | 5C | output | Channel 5 Darlington open-collector output. Sinks up to 500mA at up to 50V. |+| 13 | 4C | output | Channel 4 Darlington open-collector output. Sinks up to 500mA at up to 50V. |+| 14 | 3C | output | Channel 3 Darlington open-collector output. Sinks up to 500mA at up to 50V. |+| 15 | 2C | output | Channel 2 Darlington open-collector output. Sinks up to 500mA at up to 50V. |+| 16 | 1C | output | Channel 1 Darlington open-collector output. Sinks up to 500mA at up to 50V. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | 7-channel NPN Darlington array (sink) |+| Output voltage | 50 V max |+| Output current | 500 mA per channel |+| Input | 6 V to 15 V CMOS/PMOS logic |+| Clamp diodes | Integrated common-cathode |+| Operating temperature | -40 C to 85 C |++## Ordering variants++- `ULN2004AD`+- `ULN2004AAD`+- `ULN2004AN`+- `ULN2004AAN`+- `ULN2004ANS`+- `ULN2004AANS`+- `ULN2004APW`+- `ULN2004AAPW`+- `ULN2004ADYY`+- `ULN2004AADYY`++## CAD (KiCad official)++- Symbol: `uln2004a.kicad_sym`+- Footprint: `uln2004a.kicad_mod`+- 3D model: SOIC-16 body from KiCad `Package_SO/SOIC-16_3.9x9.9mm_P1.27mm`.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/uln2003a.pdf) (42 pp, sha256 `0151daa4ffa9135f`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/uln2004a-datasheet.pdf)

@@ -0,0 +1,36 @@+{+  "slug": "uln2004a",+  "version": "0.1.0",+  "type": "component",+  "description": "Seven NPN Darlington pairs with 50 V, 500 mA outputs and clamp diodes, for 6-15 V CMOS inputs.",+  "tags": [+    "darlington",+    "driver",+    "relay-driver",+    "transistor-array",+    "ti",+    "soic-16"+  ],+  "dependencies": {},+  "hero": {+    "type": "image",+    "path": "docs/hero.png"+  },+  "files": [+    "page.json",+    "README.md",+    "uln2004a.kicad_sym",+    "uln2004a.kicad_mod",+    "uln2004a.glb",+    "uln2004a.step",+    "docs/hero.png",+    "docs/uln2004a-datasheet.pdf",+    "viewers/symbol.html",+    "viewers/footprint.html"+  ],+  "visibility": "public",+  "author": {+    "name": "Ray",+    "email": "[email protected]"+  }+}\ No newline at end of file