LM339 is a voltage comparator IC from LMx39x series and is manufactured by many industries. The devices consist of four independent voltage comparators that are designed to operate from a single power supply. Also operation from dual supplies is possible, as long as the difference between the two supplies is 2 V to 36 V.
LM339 Pin Configuration
LM339 is a 14 pin device as shown in above pin diagram. Here we will name the pinout of all four comparators on the chip and describe function of each pin.
Pin
Name
Description
1
1OUT
Output pin of the comparator 1
2
2OUT
Output pin of the comparator 2
3
VCC
Power supply
4
2IN-
Negative input pin of the comparator 2
5
2IN+
Positive input pin of the comparator 2
6
1IN-
Negative input pin of the comparator 1
7
1IN+
Positive input pin of the comparator 1
8
3IN-
Negative input pin of the comparator 3
9
3IN+
Positive input pin of the comparator 3
10
4IN-
Negative input pin of the comparator 4
11
4IN+
Positive input pin of the comparator 4
12
GND
Ground
13
4OUT
Output pin of the comparator 4
14
3OUT
Output pin of the comparator 3
The device is available in many packages; a designer can choose one depending on their requirement.
Features and Electrical Characteristics of LM339
Four individually operated voltage comparators
Low noise interference among comparators
Single Supply Operation: +3.0 V to +36 V
Dual Supply Operation: +18V and -18V
Low Input Bias Current: 25 nA
Low Input Offset Current: ±5.0 nA
Low Input Offset Voltage
Input Common Mode Voltage Range to GND
Low Output Saturation Voltage: 130 mV @ 4.0 mA
TTL and CMOS compatible
ESD Clamps on the inputs increase reliability without affecting device operation
Pb−Free, Halogen Free/BFR Free and RoHS compliant
Applications
Oscillators
Voltage comparators
Peak detectors
Logic voltage translation
Power supervision
Industrial
Measuring instruments
Automotive
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