LM139AD

Product Overview

Category: Integrated Circuits (ICs)

Use: LM139AD is a quad voltage comparator designed for use in industrial, automotive, and consumer applications. It is commonly used in circuits where accurate comparisons between voltages are required.

Characteristics: - Low input offset voltage - Wide supply voltage range - High output current - Fast response time

Package: LM139AD is available in an 8-pin SOIC package.

Essence: The essence of LM139AD lies in its ability to accurately compare voltages and provide a digital output based on the comparison result.

Packaging/Quantity: LM139AD is typically sold in reels containing 2500 units per reel.

Specifications

• Input Offset Voltage: 2 mV (maximum)
• Supply Voltage Range: ±2 V to ±18 V
• Output Current: 20 mA
• Response Time: 1.3 μs (typical)

Pin Configuration

LM139AD features an 8-pin SOIC package with the following pin configuration:

```

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| | --|IN(-) | --|IN(+) | --|V- | --|OUT | --|V+ | --|GND | --|OFFSET | |___________| ```

Functional Features

• Quad voltage comparator
• Open collector outputs
• Differential inputs
• Internal hysteresis for improved noise immunity

Advantages and Disadvantages

Advantages: - Low input offset voltage ensures accurate voltage comparisons - Wide supply voltage range allows for versatile applications - High output current capability enables direct drive of various loads - Fast response time for real-time applications

Disadvantages: - Limited number of comparators (4) in a single package - Open collector outputs require external pull-up resistors for proper operation

Working Principles

LM139AD compares the voltages applied to its IN(+) and IN(-) inputs. The output of the comparator is determined by the voltage difference between these inputs. When the voltage at IN(+) is higher than IN(-), the output goes low (logic 0). Conversely, when the voltage at IN(-) is higher, the output goes high (logic 1).

Detailed Application Field Plans

LM139AD finds applications in various fields, including: 1. Industrial control systems 2. Automotive electronics 3. Power supply monitoring 4. Battery management systems 5. Signal conditioning circuits 6. Voltage level detection

Alternative Models

Some alternative models that can be considered as alternatives to LM139AD are: 1. LM339: Quad voltage comparator with similar specifications and pin configuration. 2. LM324: Quad operational amplifier with built-in comparators. 3. LM311: Single voltage comparator with higher speed and wider supply voltage range.

These alternative models offer different features and performance characteristics, allowing users to choose the most suitable option for their specific application requirements.

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