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Why are ULN2803 normally used between the microcontrollers and the relays?

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+1 vote
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in Microcontroller by (14.6k points)
Why are ULN2803 normally used between the microcontrollers and the relays?

(a) for switching purposes

(b) for increasing the current capability required by a relay

(c) for increasing the voltage capability required by a relay

(d) all of the mentioned

I have been asked this question in an interview.

The origin of the question is Interfacing with Motors topic in section AVR Microcontroller of Microcontroller

1 Answer

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by (24.2k points)
Correct option is (b) for increasing the current capability required by a relay

The explanation: More current is desired for driving a motor with the help of a relay, so a ULN2803 is used for increasing the current as per the requirement of the relay.

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