ULN2804A 
Datasheet
High-Volt, High-current, Darlington Array,
Features
- 500-mA-Rated Collector Current (Single Output)
- High-Voltage Outputs...50 V
- Output Clamp Diodes
- Inputs Compatible With Various Types of Logic
- Relay Driver Applications
- Compatible With ULN2800A-Series
Description
The ULN2804A is a monolithic high-voltage, high-current Darlington transistor array, comprising eight npn Darlington pairs. All units feature high-voltage outputs with common-cathode clamp diodes for switching inductive loads. The collector-current rating of each Darlington pair is 500 mA. Outputs and inputs can each be paralleled for higher current capability.
Applications include relay drivers, hammer drivers, lamp drivers, display drivers (LED and gas discharge), line drivers, and logic buffers.
The ULN2804A has an approximate 10.5-k series input resistor to allow its operation directly from CMOS or PMOS, utilizing supply voltages of 6 to 15 volts.
The ULN2804A is characterized for operation from -20°C to 85°C.