component
ULN2003A
Public Unreviewedby adom
TI 7-channel Darlington array, SOIC-16. 500 mA/50 V per channel, freewheeling diodes, TTL inputs. Datasheet-verified.
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README.md+57−2@@ -1,5 +1,60 @@ # ULN2003A -7-channel Darlington driver array, 500mA per channel, DIP-16+**Texas Instruments** · Darlington transistor array · SOIC-16 -The ULN2003A is a 7-channel Darlington transistor array with integrated suppression diodes. Each channel sinks up to 500mA. Commonly used to drive stepper motors, relays, and LED arrays from logic outputs.+High-voltage, high-current Darlington transistor array with seven NPN Darlington pairs, in a SOIC-16 package. Each channel sinks up to 500 mA at 50 V, with integrated common-cathode freewheeling diodes (COM pin) for driving inductive loads and 2.7 kohm series base resistors that make the inputs directly TTL / 5 V CMOS compatible. The default way to drive relays, solenoids, unipolar stepper motors, lamps, and LED banks from an MCU's logic pins.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | 1B | input | Channel 1 Darlington base input. Drives channel 1 through an internal 2.7 kΩ series base resistor; TTL/5 V CMOS compatible. VI(on) ≤ 2.4 V typical for IC = 200 mA. |+| 2 | 2B | input | Channel 2 Darlington base input. Drives channel 2 through the internal 2.7 kΩ base resistor; TTL/5 V CMOS compatible. |+| 3 | 3B | input | Channel 3 Darlington base input. Drives channel 3 through the internal 2.7 kΩ base resistor; TTL/5 V CMOS compatible. |+| 4 | 4B | input | Channel 4 Darlington base input. Drives channel 4 through the internal 2.7 kΩ base resistor; TTL/5 V CMOS compatible. |+| 5 | 5B | input | Channel 5 Darlington base input. Drives channel 5 through the internal 2.7 kΩ base resistor; TTL/5 V CMOS compatible. |+| 6 | 6B | input | Channel 6 Darlington base input. Drives channel 6 through the internal 2.7 kΩ base resistor; TTL/5 V CMOS compatible. |+| 7 | 7B | input | Channel 7 Darlington base input. Drives channel 7 through the internal 2.7 kΩ base resistor; TTL/5 V CMOS compatible. |+| 8 | E | power_in | Common emitter shared by all seven Darlington channels. Typically tied to ground; all voltage references in the datasheet are with respect to this pin. |+| 9 | COM | power_in | Common-cathode node for the seven integrated flyback (freewheeling) clamp diodes. Connect to the positive supply of the inductive load (relay/solenoid/motor supply, up to 50 V) to clamp inductive kickback. |+| 10 | 7C | output | Channel 7 Darlington open-collector output. Sinks up to 500 mA per channel to the common emitter (pin 8); VCE(sat) ≈ 1 V at 200 mA. Withstands 50 V off-state. |+| 11 | 6C | output | Channel 6 Darlington open-collector output. Sinks up to 500 mA; 50 V off-state rating. |+| 12 | 5C | output | Channel 5 Darlington open-collector output. Sinks up to 500 mA; 50 V off-state rating. |+| 13 | 4C | output | Channel 4 Darlington open-collector output. Sinks up to 500 mA; 50 V off-state rating. |+| 14 | 3C | output | Channel 3 Darlington open-collector output. Sinks up to 500 mA; 50 V off-state rating. |+| 15 | 2C | output | Channel 2 Darlington open-collector output. Sinks up to 500 mA; 50 V off-state rating. |+| 16 | 1C | output | Channel 1 Darlington open-collector output. Sinks up to 500 mA; 50 V off-state rating. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | 7-channel Darlington transistor array |+| Output current | 500 mA per channel |+| Output voltage | 50 V |+| Inputs | TTL / 5 V CMOS (2.7 kΩ series base R) |+| Inductive loads | Common-cathode freewheeling diodes (COM) |+| Channels | 7 |+| Package | SOIC-16 |+| Body (L×W×H) | 9.9 × 3.9 × 1.75 mm |++## Ordering variants++- `ULN2003AD (SOIC-16, tube)`+- `ULN2003ADR (SOIC-16, tape & reel)`++## CAD (KiCad official)++- Symbol: `Transistor_Array:ULN2003`+- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`+- 3D model: SOIC-16 (KiCad packages3D)++## 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; refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/uln2003a-datasheet.pdf)
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package.jsonadded+30@@ -0,0 +1,30 @@+{+ "slug": "uln2003a",+ "version": "0.1.0",+ "type": "component",+ "description": "TI 7-channel Darlington array, SOIC-16. 500 mA/50 V per channel, freewheeling diodes, TTL inputs. Datasheet-verified.",+ "tags": [+ "component",+ "driver",+ "darlington-array",+ "relay-driver",+ "soic-16",+ "texas-instruments"+ ],+ "dependencies": {},+ "hero": {+ "type": "image",+ "path": "docs/hero.png"+ },+ "files": [+ "page.json",+ "README.md",+ "uln2003a.kicad_sym",+ "uln2003a.kicad_mod",+ "uln2003a.glb",+ "docs/hero.png",+ "docs/uln2003a-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html"+ ]+}
page.json+27−7@@ -4,8 +4,15 @@ "slug": "uln2003a", "title": "ULN2003A", "brief": "7-channel Darlington driver array, 500mA per channel, DIP-16",- "version": "1.0.0",- "tags": [],+ "version": "0.1.0",+ "tags": [+ "component",+ "driver",+ "darlington-array",+ "relay-driver",+ "soic-16",+ "texas-instruments"+ ], "license": "MIT", "component": { "mpn": "ULN2003A",@@ -20,18 +27,31 @@ }, "readme": "# ULN2003A\n\n7-channel Darlington driver array, 500mA per channel, DIP-16\n\nThe ULN2003A is a 7-channel Darlington transistor array with integrated suppression diodes. Each channel sinks up to 500mA. Commonly used to drive stepper motors, relays, and LED arrays from logic outputs.", "author": {- "id": "695820315b5f1e4db2fcf602", "name": "Kyle Bergstedt", "email": "[email protected]" },- "visibility": {- "public": true+ "visibility": "public",+ "hero": {+ "type": "image",+ "path": "docs/hero.png" },- "hero": null, "sample_prompts": [], "discovery_triggers": [], "discovery_pitch": null, "metadata": {}, "created_at": "2026-05-28T05:34:26.281Z",- "updated_at": "2026-05-28T05:34:26.281Z"+ "updated_at": "2026-05-28T05:34:26.281Z",+ "description": "TI 7-channel Darlington array, SOIC-16. 500 mA/50 V per channel, freewheeling diodes, TTL inputs. Datasheet-verified.",+ "dependencies": {},+ "files": [+ "page.json",+ "README.md",+ "uln2003a.kicad_sym",+ "uln2003a.kicad_mod",+ "uln2003a.glb",+ "docs/hero.png",+ "docs/uln2003a-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html"+ ] }
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