Free LM393 Comparator Calculators
Design hysteresis, threshold, and battery monitor circuits in seconds. The first tool site built specifically for LM393, LM358, and LM339 engineers.
Engineering Tools
Free calculators and resources for voltage comparator IC design.
Hysteresis Calculator
Calculate V_threshold_high / low with resistor values. Includes waveform visualization.
Threshold Calculator
BMS, light sensor, audio detection presets with complete BOM and circuit diagrams.
IC Selection Tool
Compare LM393 vs LM358 vs LM339 vs TLC3704. Find drop-in replacements when stock is low.
Module Database
100+ LM393-based sensor modules with Arduino/ESP32 compatibility data.
BMS Designer
Battery protection circuit calculator for Li-ion, lead-acid, and LiFePO4 packs.
AI Circuit Helper
Describe your application, get a complete circuit + BOM + Arduino code.
Why comparator.online?
LM393-Specific
Unlike generic comparator calculators, our tools are designed around LM393, LM358, LM339, and the new LM393B.
Modern & Mobile-Friendly
Works perfectly on desktop and mobile. Dark mode by default for engineers who code at night.
100% Free, No Signup
All tools are free to use. No account required, no email harvest, no paywalls on basic features.
About LM393 Voltage Comparators
The LM393 is a dual independent precision voltage comparator IC, originally designed by Texas Instruments. It is one of the most popular analog ICs ever made, found in millions of battery management systems, sensor modules, and educational electronics kits worldwide.
Key specifications: operates from 2V to 36V single supply, open-collector output, 1.3µs typical response time, low input offset voltage. The 2026 update — LM393B — improves ESD rating to 2kV and reduces offset voltage to 0.37mV.
Our calculators help you design circuits faster, with standard E96 resistor values and proven formulas based on the LM393 datasheet. Whether you are designing a battery monitor, light sensor, motor controller, or learning comparator theory, our tools save you time.