The clamp diodes are built in these relays driver ICs and which eliminates the usage of freewheeling diodes. The above circuit represents the interfacing of PIC microcontroller (PIC16F877A) with relays using a relay driver circuit 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. It is difficult to use a number of relays with transistors, so, relay driver IC ULN2003A can be used for availing more relays. Relay Driver Circuit using ULN2003 Relay Driver Circuit using IC ULN2003 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. The pin diagram of IC ULN2003A is shown in the above figure which consists of 16 pins. ![]() Relay Driver IC ULN2003 Internal Schematic Diagram
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