LM339M

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Comparator
• Characteristics: Low power consumption, wide supply voltage range, high input impedance, open collector output, and low propagation delay.
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: The LM339M is a quad voltage comparator designed to operate from a single power supply over a wide range of voltages. It is commonly used in applications that require comparing analog signals with a reference voltage.

Specifications

• Supply Voltage Range: 2V to 36V
• Input Offset Voltage: 2mV (maximum)
• Input Bias Current: 25nA (maximum)
• Response Time: 1.3μs (typical)
• Output Sink Current: 16mA (maximum)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM339M has 14 pins arranged as follows:

___________ VCC | 1 14 | GND IN(-) | 2 13 | OUT(-) IN(+) | 3 12 | OUT(+) REF | 4 11 | - OUT | 5 10 | + A1 | 6 9 | A4 A2 | 7 8 | A3 -------------

Functional Features

• Quad voltage comparator with open collector outputs.
• Wide supply voltage range allows operation from a single power supply or dual supplies.
• High input impedance makes it suitable for interfacing with various signal sources.
• Low power consumption extends battery life in portable applications.
• Open collector outputs provide flexibility for driving different loads.
• Low propagation delay enables fast response time in comparator applications.

Advantages and Disadvantages

Advantages: - Wide supply voltage range allows versatile use in different applications. - Low power consumption makes it suitable for battery-powered devices. - High input impedance ensures minimal loading of the signal source. - Open collector outputs provide flexibility in driving external circuitry.

Disadvantages: - Limited output current capability may require additional buffering for certain applications. - Input offset voltage may introduce errors in precision applications.

Working Principles

The LM339M compares the voltages at its inputs and produces a digital output based on the comparison result. It operates by amplifying the voltage difference between the IN(+) and IN(-) inputs and comparing it with the reference voltage (REF). The output switches to a low state when the voltage at IN(-) is higher than IN(+), and switches to a high state otherwise.

Application Field Plans

The LM339M finds applications in various fields, including:

1. Battery chargers: Monitoring battery voltage levels and controlling charging process.
2. Motor control: Detecting position or speed of rotating components.
3. Overvoltage/undervoltage protection: Triggering alarms or shutdowns when voltage exceeds or falls below specified limits.
4. Signal conditioning: Amplifying and filtering analog signals before further processing.
5. Level detection: Determining if a signal crosses a specific threshold level.

Alternative Models

Other alternative models that can be used as substitutes for the LM339M include:

1. LM393: Dual voltage comparator with similar characteristics.
2. LM311: Single voltage comparator with faster response time.
3. LM324: Quad operational amplifier with built-in comparators.

These alternatives offer similar functionality and can be chosen based on specific application requirements.

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