If you are willing to drive multiple loads, then this chip can be used as it is capable of driving eight loads at a time.Each set of these Darlington pair is capable of driving high power loads that use logic from the control unit. In ULN2803, the Darlington array act as separate 8 individual switches and thus can be turned off and on as desired. To control the inductive loads those are making use of the logic obtained by the control unit.The ULN2803 chip can be used in the following cases: You can remodel eight Darligngton Transistors or eight MOSFETs to substitute for ULN2803. There are no PIN-to-PIN replacements for ULN2803 but there are similar functioning ICs like ULN2003, ULN2004. Here we take ULN2803A as an example to introduce ULN2803 package. Its rated current is usually 50v / 500mA. This IC is widely used to drive high loads, such as lamps, relays, motors, etc. The IC consists of eight NPN Darlington-connected transistors and a common clamp diode to switch the load connected to the output. ULN2803 is a high-voltage, high-current transistor array IC, especially for microcontrollers that need to drive high-power loads.
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