LM393 IC

The LM393 IC is a dual voltage comparator: it contains two independent comparators that each compare two input voltages and switch their output depending on which one is higher. It runs from a single supply as low as 2 V, draws very little current and has open-collector outputs, which makes it a common choice for sensor modules, threshold detectors and interfacing analog signals with Arduino and ESP32 boards.

LM393 IC Specifications

• Function: dual differential voltage comparator
• Supply voltage: 2–36 V single supply, or ±1 to ±18 V dual supply
• Supply current: about 0.4 mA (typical)
• Outputs: open collector, need a pull-up resistor
• Input range: includes ground (0 V)
• Pins: 8 (1: OUT1, 2: IN1−, 3: IN1+, 4: GND, 5: IN2+, 6: IN2−, 7: OUT2, 8: VCC)

LM393 IC Applications

• Light, sound, soil moisture and IR sensor modules
• Battery low-voltage and over-voltage detectors
• Converting analog signals into clean digital levels
• Window comparators, oscillators and zero-cross detectors

What's in the Box

• 1 × LM393 dual comparator IC

Tip: Because the outputs are open collector, add a pull-up resistor (for example 10 kΩ) from each output to your logic supply, such as 5 V or 3.3 V. This also lets the LM393 feed a 3.3 V microcontroller safely while the comparator itself runs from a higher supply.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.