Dual-Channel LM393 Voltage Comparator Module – DC 5V 10A Max, Onboard IC for Precision Monitoring

Description

Description

The Dual-Channel LM393 Voltage Comparator Module is a compact, high-performance analog signal processing board designed for precision voltage monitoring and threshold detection applications. At its heart lies the industry-standard LM393 dual differential comparator IC from Texas Instruments, a reliable and widely-used component in electronic design for over three decades .

This module integrates two independent voltage comparators on a single board, each capable of comparing two analog input voltages and outputting a digital signal indicating which input is higher. When the voltage at the non-inverting input (+) exceeds the voltage at the inverting input (-), the corresponding open-collector output turns on (pulls low). Conversely, when the inverting input is higher, the output turns off (high impedance) .

The LM393 IC features a wide supply voltage range of 2V to 36V (or up to 30V depending on grade), making it suitable for both 3.3V and 5V microcontroller systems as well as higher-voltage industrial applications . The module includes two precision potentiometers that allow users to set adjustable reference voltages for each comparator channel independently. This enables flexible threshold configuration without requiring external resistor networks.

The module also features two onboard indicator LEDs that provide real-time visual feedback of each comparator’s output status. When an output is active (pulled low), the corresponding LED illuminates, allowing for immediate visual verification without needing an oscilloscope.

The LM393’s outputs are open-collector, meaning they can drive loads up to 10A (with appropriate external transistors) and are compatible with TTL, MOS, and CMOS logic levels . The outputs can also be connected together to create wired-AND relationships, a useful feature for complex logic designs .

Whether you are building a battery low-voltage cutoff circuit, a light sensor trigger, a motor over-current protection system, a window comparator, or a simple analog-to-digital converter, this LM393 dual comparator module delivers precise, reliable threshold detection in an easy-to-use format.

Key Features

• Dual Independent Comparators – Two separate comparator channels on a single board for simultaneous monitoring of two different signals

• LM393 Comparator IC – Industry-standard dual differential comparator from Texas Instruments with proven reliability 

• Wide Supply Voltage Range – Operates from 2V to 36V DC (module typically includes onboard 5V regulation for reference circuits) 

• Adjustable Reference Voltage – Two precision potentiometers for setting independent threshold voltages on each channel

• Onboard Status LEDs – Visual output indicators for each comparator channel; LED illuminates when output is active (low)

• Open-Collector Outputs – Compatible with TTL, MOS, and CMOS logic; outputs can be paralleled for wired-AND configurations 

• Input Common-Mode Range Includes Ground – Allows direct measurement of signals near 0V 

• Low Power Consumption – Only 200µA typical supply current per comparator at 5V 

• Fast Response Time – 1.3µs typical propagation delay for rapid threshold detection 

• Low Input Bias Current – 25nA typical minimizes loading on signal sources 

• Two 10A Relay Control Capability – Outputs can drive external transistors or relays; “10A Max” refers to external load capacity with proper driver stage

• Compact Module Design – Small footprint with clearly labeled input/output screw terminals

Technical Specifications