The ULN2803A is a high-voltage, high-current Darlington transistor array. The device consists of eight npn Darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for switching inductive loads. The collector-current rating of each Darlington pair is 500 mA. The Darlington pairs may be connected in parallel for higher current capability.

Features:

• High-Voltage Outputs . . . 50 V
• Output Clamp Diodes
• Relay Driver Applications
• Compatible with ULN2800A Series
• 500-mA Rated Collector Current (Single Output)
• Inputs Compatible With Various Types of Logic

Key Specifications:

• Power requirements: N/A
• Communication: N/A
• Dimensions: 0.88 x 0.24 x 0.14 in (22.2 x 6.1 x 3.56 mm)

Downloads & Resources:
ULN2803A Datasheet (.pdf)
N&V column "Silicon Steroids for the Stamp" #6 (.pdf)