LM339 VOLTAGE COMPARATOR IC
LM339 is a voltage comparator IC from the 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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