LM393 Dual Comparator IC (DIP)

LM393 Dual Comparator IC (DIP) Overview

The LM393 Dual Comparator IC (DIP) is a reliable analog device that integrates two independent precision voltage comparators in one standard DIP package. Designed for voltage detection and decision-making circuits, the LM393 outputs a digital-level signal when one input exceeds the other, making it ideal for sensor interfacing, level detection, and many general-purpose comparison tasks.

Why choose the LM393 Dual Comparator IC

• Specifically built for voltage comparison rather than amplification, ensuring stable switching behavior.
• Low power consumption keeps battery drain minimal in portable systems.
• Open-collector outputs allow easy interfacing with TTL, CMOS, and other logic families via pull-up resistors.
• Accepts a wide supply voltage range for flexible single-supply or dual-supply designs.

Key Features

• Two independent voltage comparators in one IC
• Open-collector outputs for easy logic interfacing and level shifting
• Wide supply voltage range: 2V to 36V (single supply) or ±1V to ±18V (dual supply)
• Low power consumption, suitable for battery-powered designs
• Fast response time with high precision switching
• Standard DIP package, breadboard and PCB friendly

Common Applications

• Voltage level detection and window comparators
• Zero-crossing detection for AC signal processing
• Oscillators and waveform generator control circuits
• Sensor threshold detection and alarm circuits
• Battery monitoring and low-voltage disconnect circuits
• General analog-to-digital signal comparison functions

Technical Specifications (Typical)

• Supply voltage: 2V to 36V (single supply) or ±1V to ±18V (dual supply)
• Input offset voltage: typically a few millivolts (see datasheet for detailed values)
• Output type: open-collector, requires external pull-up resistor
• Operating temperature range: commercial and industrial grades available depending on manufacturer
• Package: 8-pin DIP, convenient for prototyping and through-hole assembly

Pinout and Package – LM393 (8-pin DIP)

• Pin 1: Output A (open-collector)
• Pin 2: Inverting Input A
• Pin 3: Non-inverting Input A
• Pin 4: Ground (GND)
• Pin 5: Non-inverting Input B
• Pin 6: Inverting Input B
• Pin 7: Output B (open-collector)
• Pin 8: VCC (positive supply)

Typical Circuits and Usage Tips

• Always use a pull-up resistor on open-collector outputs. Typical values range from 1k to 100k depending on speed and supply voltage requirements.
• For single-supply designs, ensure input voltages stay within the common-mode range specified in the datasheet to avoid unpredictable behavior.
• Place bypass capacitors close to the VCC and GND pins to minimize noise and improve comparator stability.
• Use hysteresis (positive feedback) where switch bouncing or signal noise could cause rapid output toggling.
• Refer to the manufacturer datasheet for timing, offset, and absolute maximum ratings when designing precision circuits.

Ordering, Packaging, and Prototyping

The LM393 Dual Comparator IC is commonly available in 8-pin DIP packaging, making it ideal for breadboard prototyping and educational projects. Check part markings and manufacturer datasheets when ordering to ensure the correct temperature grade and electrical specifications for your application.

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