IC LM339 : Pin Configuration, Circuit Diagram and Its Applications

LM339 is a voltage comparator IC that consist of four independent voltage comparator that is designed to operate in a single power supply.
This IC has four inbuilt operational amplifiers internally.

Pin configuration of IC LM339

Pins	Description
Pin1	(OUT): It is an output pin of the first comparator.
Pin2	(OUT): It is an output pin of the second comparator
Pin3	(VCC): It is the Power supply of the comparator.
Pin4	(IN-): It is a negative input pin of the second comparator
Pin5	(IN+): It is a positive input pin of the second comparator.
Pin6	(IN-): It is a negative input of the first comparator
Pin7	(IN+): It is a positive pin of the first comparator.
Pin8	(IN-): It is a negative pin of the third comparator.
Pin9	(IN+): It is a positive pin of the third comparator
Pin10	(IN-): It is a negative pin of the fourth comparator
Pin11	(IN+): It is a positive input pin of the fourth comparator
Pin12	(GND): It is a ground pin
Pin13	(OUT4): It is an output pin of the fourth comparator.
Pin14	(OUT3): It is an output pin of the third comparator.

The LM339 IC is used in Power supervision, Industrial, Oscillators, Peak detectors, Voltage comparators, Measuring instruments, Logic voltage translation, Automotive, Driving CMOS, Low-Frequency Op-amp, Transducer Amplifier, Zero Crossing Detector, Limit comparator, Crystal controlled oscillator, Negative reference comparator, Driving TTL, etc.