LM339 Quad Voltage Differential Comparator
The LM339 is a quad voltage comparator IC. It contains four independent comparators. Each comparator operates from a single or dual power supply. The voltage range extends from 2 V to 36 V for single supply, or ±1 V to ±18 V for dual supply. It supports wide range of input voltages .
Open-collector outputs are provided. These outputs allow wired-AND configurations. The output can swing to ground. The pull-up resistors on the output. It ensures Low power consumption and supports fast time response . Operation is stable over temperature changes.
The IC is commonly used in zero-crossing detectors. It can also be found in level shifters and voltage sensing circuits. This IC often implements with this IC. Precision is maintained in noisy environments. Reliability is ensured in both analog and digital systems.
Applications
Voltage level detection in analog systems
Zero-crossing detection for AC signal control
Pulse-width modulation signal shaping
Battery level monitoring circuits
Window comparators in analog controls
Overvoltage and undervoltage sensing
Logic level shifting in mixed-voltage environments
Analog-to-digital interface circuits
Oscillator and timing circuit comparators
Comparator-based switching control systems
Key Features
Four independent voltage comparators
Open-collector output for flexible interfacing
Wide supply voltage range: 2 V to 36 V (single)
Dual-supply operation: ±1 V to ±18 V
Low supply current: 1 mA typical
Input common-mode range includes ground
Output capability: can sink up to 16 mA
Low input offset voltage
Fast response time: ~1.3 µs
Available in DIP, SOIC, and TSSOP packages
Pin Configuration (14-Pin DIP/SOIC)
| Pin | Name | Description |
|---|---|---|
| 1 | Output 2 | Comparator 2 output |
| 2 | Output 1 | Comparator 1 output |
| 3 | V+ | Positive supply voltage |
| 4 | Input 1− | Inverting input of comparator 1 |
| 5 | Input 1+ | Non-inverting input of comp. 1 |
| 6 | Input 2− | Inverting input of comparator 2 |
| 7 | Input 2+ | Non-inverting input of comp. 2 |
| 8 | Input 3+ | Non-inverting input of comp. 3 |
| 9 | Input 3− | Inverting input of comparator 3 |
| 10 | Input 4+ | Non-inverting input of comp. 4 |
| 11 | Input 4− | Inverting input of comparator 4 |
| 12 | Output 4 | Comparator 4 output |
| 13 | Output 3 | Comparator 3 output |
| 14 | V− (GND) | Ground or negative supply |
Specifications Table
| Parameter | Value |
|---|---|
| Number of Comparators | 4 |
| Supply Voltage Range (Single) | 2 V to 36 V |
| Supply Voltage Range (Dual) | ±1 V to ±18 V |
| Input Offset Voltage | 2 mV typical |
| Input Bias Current | 25 nA typical |
| Output Sink Current | Up to 16 mA |
| Input Common-Mode Range | 0 V to V+ – 1.5 V |
| Supply Current | ~1 mA total (typical) |
| Response Time | ~1.3 µs ‘ |
| Operating Temperature Range | 0 °C to +70 °C (commercial) |
| Package Types | DIP-14, SOIC-14, TSSOP-14 |
