Introduction
The LM393 IC is a widely used dual comparator integrated circuit designed for low-power, low-offset voltage, and precise voltage comparison applications. This LM393 IC contains two independent precision voltage comparators capable of operating from a single power supply or split supplies. Its open-collector outputs allow it to interface easily with digital logic circuits, making it highly versatile in both analog and digital electronic designs.
The LM393 dual comparator is popular for its ability to operate at low voltages while maintaining accuracy. It has a wide common-mode input voltage range, which includes ground, making it suitable for low-voltage battery-operated systems. The IC is used in various electronic projects such as sensor interfacing, voltage level detection, oscillators, and waveform generators.
LM393 Dual Comparator IC
Thanks to its low power consumption, wide supply voltage range (2V to 36V), and compatibility with both TTL and CMOS logic levels, the LM393 is one of the most common ICs in electronics. It is available in DIP-8, SOIC-8, and TSSOP-8 packages, making it easy to integrate into both hobbyist and professional circuits.
LM393 Pinout
LM393 Key Features
- Dual independent voltage comparators.
- Wide supply voltage range: 2V to 36V (single supply) or ±1V to ±18V (dual supply).
- Open-collector outputs compatible with TTL and CMOS.
- Low supply current drain, independent of supply voltage.
- Common-mode input voltage includes ground.
- Low input offset voltage.
- Capable of driving LED, relays, and logic circuits directly.
LM393 Specifications/Characteristics
- Supply Voltage (Vcc): 2V to 36V (single supply) or ±1V to ±18V (dual supply)
- Input Offset Voltage: Typically 2mV
- Input Bias Current: 25nA (typical)
- Output Sink Current: 16mA (maximum)
- Power Dissipation: 500mW
- Operating Temperature Range: 0°C to +70°C (commercial), -40°C to +85°C (industrial)
- Package Types: DIP-8, SOIC-8, TSSOP-8
Note: DATASHEET DOWNLOAD button is provided end of this article.
Pin Configuration of LM393 Dual Comparator IC
| Pin# | Pin Name | Pin Description |
|---|---|---|
| 1 | Output A | Comparator A output (open collector) |
| 2 | Input A- | Inverting input of comparator A |
| 3 | Input A+ | Non-inverting input of comparator A |
| 4 | GND | Ground (0V reference) |
| 5 | Input B+ | Non-inverting input of comparator B |
| 6 | Input B- | Inverting input of comparator B |
| 7 | Output B | Comparator B output (open collector) |
| 8 | Vcc | Positive power supply |
More Circuit Layouts
Key Applications of LM393 Dual Comparator IC
- Zero-crossing detectors
- Voltage level detectors
- Pulse width modulators (PWM)
- Oscillators and waveform generators
- Battery voltage monitoring
- Sensor interfacing (temperature, light, IR, etc.)
- Logic level converters
- Relay and LED drivers
LM393 Equivalent ICs / Alternatives
- LM339 (quad comparator)
- LM2903 (low-power dual comparator)
- LM311 (single comparator)
- UA733, CA3130 (alternatives depending on application)
(The pinout for certain ICs can vary from that of the LM393).
Datasheet of LM393 Dual Comparator IC
Click the following Button below to download the datasheet of LM393 :
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