ULN2003AI is a high-voltage, high-current Darlington transistor array product from TI. This device consists of seven npn Darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for switching inductive loads. The collector-current rating of a single Darlington pair is 500 mA. The Darlington pairs can be paralleled for higher current capability. It is suitable for relay drivers, hammer drivers, lamp drivers, display drivers (LED and gas discharge), line drivers and logic buffers.
The ULN2003A Darlington transistor array provides seven NPN Darlington pairs with high‑voltage outputs and built‑in clamp diodes, suitable for driving relays, lamps, LEDs and other inductive loads. Each channel can handle up to 500 mA continuous collector current and the device operates over a wide temperature range.
The datasheet includes ordering information, absolute maximum ratings, electrical and switching characteristics, thermal limits, mechanical dimensions, and an important notice about warranty and product updates.
| Collector‑emitter voltage (VCEO) | 50 V |
|---|---|
| Maximum collector current per Darlington pair | 500 mA |
| Total emitter‑terminal current | 2.5 A |
| Operating temperature range | -40 °C to 105 °C |
| Storage temperature range | -65 °C to 150 °C |
| Input voltage rating | 30 V |
| Output clamp current | 500 mA |
Each Darlington pair can handle up to 500 mA of collector current.
The device is rated for a collector‑emitter voltage of 50 V.
It operates from –40 °C up to 105 °C.