This document is about ULN2803A technical data, including 500-mA rated collector current (single output), high-voltage outputs, output clamp diodes, inputs compatible with various types of logic, relay driver applications, and other information
The ULN2803A is a high‑voltage, high‑current Darlington transistor array that contains eight NPN Darlington pairs with common‑cathode clamp diodes. Each pair can handle up to 500 mA of collector current and is suitable for driving inductive loads such as relays, lamps, and displays.
The document lists absolute‑maximum ratings, electrical and switching characteristics, mechanical dimensions, and available package options (PDIP, SOIC, etc.). Ordering information, packaging status, and regulatory notes are also included.
Typical applications include relay drivers, hammer drivers, lamp drivers, LED and gas‑discharge display drivers, line drivers, and logic buffers.