LM139 Low Power Low Offset Voltage Quad Comparator

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LM139 series consists of four independent precision voltage comparators with an offset voltage specification as low as 2 mV max for all four comparators. The IC has a wide range of working conditions a wide range of working voltages and possesses direct interfacing capability with almost every PMOS, CMOS, and NMOS device. Moreover, the IC offers a wide array of features such as high noise immunity, ESD barring/reduction, and exceptionally low power dissipation.

Voltage Comparator

A voltage comparator is a simple electronic configuration, that compares two voltages at two different levels, and then switches the output to wither LOW or HIGH state with respect to a voltage that is at a higher level then the other. In other words, a voltage comparator compares the magnitude of two voltage inputs and determines which is the largest of the two. There are two main types of voltage comparators:

Non inverting Comparators
Inverting Comparators

LM139 Pinout

LM139 Pin Configuration

Pin No	Pin Name	Description
1	OUTPUT 2	Output Of Comparator 2
2	OUTPUT 1	Output Of Comparator 1
3	V+	Positive Supply
4	INV-INPUT 1	Inverting Input Of Comparator 1
5	NON-INV-INPUT 1	Non Inverting Input Of Comparator 1
6	INV-INPUT 2	Inverting Input Of Comparator 2
7	NON-INV-INPUT 2	Non Inverting Input Of Comparator 2
8	INV-INPUT 3	Inverting Input Of Comparator 3
9	NON-INV-INPUT 3	Non Inverting Input Of Comparator 3
10	INV-INPUT 4	Inverting Input Of Comparator 4
11	NON-INV-INPUT 4	Non Inverting Input Of Comparator 4
12	GND	Ground Pin
13	OUTPUT 4	Output Of Comparator 4
14	OUTPUT 3	Output Of Comparator 3