# ULN2003ADR

**Texas Instruments** · Darlington Transistor Arrays · SOIC-16

ULN2003ADR from Texas Instruments, in a SOIC-16. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | 1B | input | Channel 1 Darlington base input. TTL/5 V CMOS compatible via internal 2.7 kΩ series base resistor. Absolute maximum input voltage 30 V. |
| 2 | 2B | input | Channel 2 Darlington base input. TTL/5 V CMOS compatible via internal 2.7 kΩ series base resistor. |
| 3 | 3B | input | Channel 3 Darlington base input. TTL/5 V CMOS compatible via internal 2.7 kΩ series base resistor. |
| 4 | 4B | input | Channel 4 Darlington base input. TTL/5 V CMOS compatible via internal 2.7 kΩ series base resistor. |
| 5 | 5B | input | Channel 5 Darlington base input. TTL/5 V CMOS compatible via internal 2.7 kΩ series base resistor. |
| 6 | 6B | input | Channel 6 Darlington base input. TTL/5 V CMOS compatible via internal 2.7 kΩ series base resistor. |
| 7 | 7B | input | Channel 7 Darlington base input. TTL/5 V CMOS compatible via internal 2.7 kΩ series base resistor. |
| 8 | E | power_in | Common emitter shared by all seven Darlington channels. Typically tied to ground. Total emitter-terminal current rated -2.5 A max. |
| 9 | COM | power_in | Common cathode node for the internal flyback clamp diodes. Connect to the load supply rail (up to 50 V) when driving inductive loads such as relays or stepper motors. |
| 10 | 7C | output | Channel 7 Darlington collector output. Open-collector, rated 500 mA continuous single-output collector current, 50 V max VCE. |
| 11 | 6C | output | Channel 6 Darlington collector output. Open-collector, 500 mA / 50 V max. |
| 12 | 5C | output | Channel 5 Darlington collector output. Open-collector, 500 mA / 50 V max. |
| 13 | 4C | output | Channel 4 Darlington collector output. Open-collector, 500 mA / 50 V max. |
| 14 | 3C | output | Channel 3 Darlington collector output. Open-collector, 500 mA / 50 V max. |
| 15 | 2C | output | Channel 2 Darlington collector output. Open-collector, 500 mA / 50 V max. |
| 16 | 1C | output | Channel 1 Darlington collector output. Open-collector, 500 mA / 50 V max. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16 |
| Category | Transistors/Thyristors |
| Pins | 16 |

## Ordering variants

Same part, different packaging or reel option.

- `ULN2003ADR`
- `ULN2003ADRAN`
- `ULN2003ADRANS`
- `ULN2003ADRAPW`
- `ULN2003ADRADYY`

## CAD (KiCad official)

- Symbol: `ULN2003ADR`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files: `uln2003adr-etched.step` / `uln2003adr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `uln2003adr.step` / `uln2003adr.glb` are the bare package body.

## 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/uln2003adr-datasheet.pdf)