ULN2803A 8-Channel Darlington Transistor Array Module

8-Channel Darlington transistor driver module

The Darlington transistor circuit is not a transistor as such, but a pair of them connected in a very specific way. The two bipolar transistors connected together will form a Darlington pair that allows the current amplified by the first transistor to enter the base of the second transistor and re-amplify.

This type of amplification was used with two separate transistors, but Bell Labs engineer Sidney Darlington patented this connection in 1952. The idea was to put two or three transistors on the same monolithic chip.

The Darlington pair behaves like a single conventional transistor, that is, when two transistors are connected, which still have a single base, collector and emitter. Only that the current gain will be combined and therefore greater than when using only one transistor. In particular, the Darlington gain is believed to be approximately the product of the product between two transistor gains when used separately.

Technical Data:

Output Voltage : 50V
Rated Collector Current:500mA
Board Size: 24 x 23.33 x 4.18mm