How do I use ULN2003A?
Just attach the different loads with a different power source with ULN2003. Then Connect each load with a different power source. After that Common the ground with IC. Each Input pin controls each output.
How does a Darlington array work?
A Darlington Pair acts as one transistor but with a current gain that equals: Total current gain (hFE total) = current gain of transistor 1 (hFE t1) x current gain of transistor 2 (hFE t2) So for example if you had two transistors with a current gain (hFE) = 100: (hFE total) = 100 x 100 (hFE total) = 10,000 You can see …
What are the features of the ULN2003A relay driver?
ULN2003A has free wheeling diodes, which protects from back emf. So, if we are using any inductive load (i.e. relays), then we don’t need to add extra diodes, if we are controlling it with ULN2003A. There are a lot of keys features associated with relay driver ULN2003. A few of then are given below: 500mA of rated collector.
What can the ULN2003 IC be used for?
This IC has a very wide range of applications. They are commonly used as relay drivers in order to drive different kinds of loads. ULN2003A can also be used to drive different motors (e.g. DC Motors or Stepper Motors) with Microcontrollers (like Arduino, PIC Microcontroller or 8051 Microcontroller etc.) .
What kind of transistors are in the ULN2003A?
ULN2003A. The ULN2003A is an array of seven NPN Darlington transistors capable of 500mA, 50V output. It features common-cathode flyback diodes for switching inductive loads. The ULN2003 is known for its high-current, high-voltage capacity. The drivers can be paralleled for even higher current output.
How many pins are there in the ULN2003?
In below figure, you can see ULN2003 has 16 Pins, where inputs and their respective ouputs are placed infront of each other (for ease of circuit desining). Other than I/O Pins, we have Ground Pin where we need to provide 0V & Vcc (Common) Pin. Here’s the link to ULN2003 datasheet, must read it once.