The ULN2803 is a high-voltage, high-current Darlington transistor array. It is commonly used as a driver for inductive loads such as relays, motors, and other solenoid-driven devices in various electronic applications. Here are some key features and specifications of the ULN2803:
Number of Channels:
The ULN2803 typically consists of eight Darlington pairs, allowing it to control up to eight separate loads.
Darlington Pair:
Each channel in the ULN2803 contains a Darlington pair configuration, which is a cascaded pair of bipolar transistors that provide high current gain.
Maximum Output Voltage:
The ULN2803 is designed to handle higher output voltages, often up to 50V.
Maximum Continuous Output Current:
Each Darlington pair can handle a continuous output current of up to 500mA, and the overall package can handle higher currents when multiple channels are used in parallel.
Clamping Diodes:
The ULN2803 includes clamping diodes to protect against voltage spikes (back-EMF) generated by inductive loads.
Input Compatibility:
The IC is designed to work with standard TTL (Transistor-Transistor Logic) and CMOS (Complementary Metal-Oxide-Semiconductor) input levels.
Applications:
Driving relays, stepper motors, solenoids, and other high-current, high-voltage loads in various electronic systems.
Common Connection:
The ULN2803 often has a common connection for each channel, simplifying the wiring for loads that share a common connection.
Open-Collector Outputs:
The outputs are open-collector, allowing flexibility in connecting external loads.
Package:
Available in different packages, such as DIP (Dual Inline Package) and SOP (Small Outline Package).
Voltage Compatibility:
Compatible with a wide range of input and output voltages, making it suitable for interfacing with different logic families and loads.
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