ULN2803AN – TEXAS INSTRUMENTS

The ULN2803AN is an 8-channel Darlington transistor array designed for interfacing low-level logic signals with high-current loads. Operating at standard 5 V TTL levels, it provides high current gain (typically 1000×) with each channel capable of sinking currents up to 500 mA, making it ideal for driving relays, solenoids, and LED arrays. Its integrated clamp diodes protect against inductive voltage spikes, ensuring reliable operation in motor control and automotive applications. Packaged in a DIP or surface-mount configuration, the ULN2803AN simplifies PCB layout in both prototyping and production environments. Detailed datasheet specifications include saturation voltage, current transfer ratio, and thermal resistance, which assist engineers in designing robust power-driving circuits. Its low input current and straightforward interfacing with microcontrollers make it a versatile solution for a wide range of industrial, consumer, and automotive systems requiring reliable high-current switching.