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What is ULN2003 relay driver?
ULN2003 is a very famous relay driver integrated circuit. Relay driver IC uln2003 is high voltage and high current integrated IC which used Darlington array. Its contains seven Darlington pair of a transistor which have high voltage and high current carrying capability.
What is uln2003 for?
Typical usage of the ULN2003A is in driver circuits for relays, lamp and LED displays, stepper motors, logic buffers and line drivers.
What is relay drive?
Relay Driver : In a low power circuit or an output from a Microprocessor is very low. It is sufficent for a LED to glow but to drive a high load you will need a Relay (Electromagnet Switch), and to give proper voltage or current to a relay you will need a relay driver.
How many relays can I use with ULN2003?
We can use seven relays with relay driver circuit using ULN2003 and the relay driver circuit using ULN2803 enables to use eight relays. The above circuit represents the interfacing of PIC microcontroller (PIC16F877A) with relays using a relay driver circuit with ULN2003.
What kind of circuit is IC ULN2003A used for?
The pin diagram of IC ULN2003A is shown in the above figure which consists of 16 pins. The IC ULN2003A comprises of 7-NPN Darlington pairs as shown in the internal schematic diagram and is typically used to switch inductive loads (dissipates voltage spikes if any using suppression diode) and to drive stepper motors.
How many transistors are in an uln3002 circuit?
Its contains seven Darlington pair of a transistor which have high voltage and high current carrying capability. Its mean ULN3002 can drive up to seven relays at a time. A diode is used with each pair of NPN Darlington transistor.
What kind of circuit is a relay driver?
There are many ways to design relay driver circuits. But dedicated relay driver circuits integrated circuits are available which serve the purpose of relay driver IC. Relay driver circuit IC ULN2003 is one of the popular relay driver circuits. I will discuss relay driver IC ULN2003 in this article.