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Fonctionnalités et applications
The Darlington configuration was invented by Bell Laboratories engineer Sidney Darlington in 1953. Darlington connected transistors are well suited for driving lamps, relays, or printer hammers in a variety of industrial and consumer applications.
A Darlington Array is a semiconductor device which combines two or more bipolar transistors in a single device so that the current amplified by the first is amplified further by the second. This gives a high current gain , and takes less space than having multiple discrete transistors in the same configuration.
The ULN2801A-ULN2805A each contain eight darlington transistors with common emitters and integral suppression diodes for inductive loads. Each darlington features a peak load current rating of 600mA (500mA continuous) and can withstand at least 50V in the off state. Outputs may be paralleled for higher current capability.
Five versions are available to simplify interfacing to standard logic families : the ULN2801A is designed for general purpose applications with a current limit resistor ; the ULN2802A has a 10.5kW input resistor and zener for 14-25V PMOS ; the ULN2803A has a 2.7kW input resistor for 5V TTL and CMOS ; the ULN2804A has a 10.5kW input resistor for 6-15V CMOS and the ULN2805A is designed to sink a minimum of 350mA for standard and Schottky TTL where higher output current is required.
All types are supplied in a 18-lead plastic DIP with a copper lead from and feature the convenient input opposite- output pinout to simplify board layout.
The ULN2804A contains 8 Darlington arrays with common emitters. It comes in a DIP18 packaging.