LM139D

Product Overview

Category: Integrated Circuits (ICs)

Use: LM139D is a quad voltage comparator designed for use in industrial, automotive, and consumer applications. It is commonly used in circuits that require accurate comparisons between two voltages.

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

Package: LM139D is available in a small outline package (SOIC) with 14 pins.

Essence: The essence of LM139D lies in its ability to accurately compare voltages and provide a digital output based on the comparison result.

Packaging/Quantity: LM139D is typically sold in reels or tubes containing 250 units per package.

Specifications

• Input Offset Voltage: 2 mV (maximum)
• Supply Voltage Range: 2 V to 36 V
• Output Current: 20 mA
• Response Time: 1.3 μs
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

LM139D has a total of 14 pins arranged as follows:

```

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| | --|IN1 | --|IN2 | --|IN3 | --|IN4 | --|GND | --|OUT1 | --|OUT2 | --|OUT3 | --|OUT4 | --|VCC+ | --|VCC- | |___________| ```

Functional Features

• Quad voltage comparator: LM139D consists of four independent voltage comparators in a single package.
• Open collector outputs: The outputs of each comparator are open collector, allowing easy interfacing with other digital circuits.
• Wide supply voltage range: LM139D can operate from a minimum supply voltage of 2 V to a maximum of 36 V.
• Low input offset voltage: The input offset voltage is minimized, ensuring accurate voltage comparisons.

Advantages and Disadvantages

Advantages: - High accuracy in voltage comparisons - Wide operating temperature range - Fast response time - Versatile applications in various industries

Disadvantages: - Limited output current capability - Requires external pull-up resistors for proper operation

Working Principles

LM139D works based on the principle of comparing two input voltages and providing a digital output based on the comparison result. Each comparator inside LM139D compares the voltage at its non-inverting input (IN1, IN2, IN3, IN4) with the voltage at its inverting input (GND). If the voltage at the non-inverting input is higher than the voltage at the inverting input, the corresponding output (OUT1, OUT2, OUT3, OUT4) goes low (logic 0). Otherwise, the output remains high (logic 1).

Detailed Application Field Plans

LM139D finds applications in various fields, including: 1. Industrial automation: Used for monitoring and control systems, motor control, and power management. 2. Automotive electronics: Employed in vehicle safety systems, engine control units, and battery management systems. 3. Consumer electronics: Utilized in audio amplifiers, voltage regulators, and battery chargers. 4. Communication systems: Integrated into signal conditioning circuits, level detectors, and data acquisition systems.

Detailed and Complete Alternative Models

Some alternative models to LM139D that offer similar functionality are: - LM339 - LM2901 - LM311 - LM393

These models can be considered as alternatives depending on specific requirements and application constraints.

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