LM293H

Product Overview

Category: Integrated Circuits (ICs)

Use: The LM293H is a dual voltage comparator designed for use in various applications such as level shifting, waveform generation, and signal conditioning.

Characteristics: - Dual voltage comparator - Wide range of operating voltage (+2V to +36V) - Low input bias current (25nA) - Low output saturation voltage (250mV) - High input impedance (1.5MΩ) - Output compatible with TTL, MOS, and CMOS logic systems

Package: The LM293H is available in a 14-pin plastic package, which provides protection against environmental factors and facilitates easy installation on printed circuit boards.

Essence: The LM293H is an essential component in electronic circuits that require precise voltage comparisons and signal conditioning.

Packaging/Quantity: The LM293H is typically sold in reels or tubes containing 1000 units per package.

Specifications

• Supply Voltage Range: +2V to +36V
• Input Offset Voltage: ±2mV
• Input Bias Current: 25nA
• Response Time: 1.3μs
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM293H has a total of 14 pins, each serving a specific function. Here is the detailed pin configuration:

1. Inverting Input 1 (-IN1)
2. Non-Inverting Input 1 (+IN1)
3. Vcc (Positive Power Supply)
4. Ground (GND)
5. Output 1 (OUT1)
6. Inverting Input 2 (-IN2)
7. Non-Inverting Input 2 (+IN2)
8. NC (No Connection)
9. NC (No Connection)
10. Output 2 (OUT2)
11. NC (No Connection)
12. NC (No Connection)
13. NC (No Connection)
14. Vcc- (Negative Power Supply)

Functional Features

The LM293H offers the following functional features:

1. Dual Comparators: The IC contains two independent voltage comparators, allowing for simultaneous comparison of two different input signals.
2. Wide Operating Voltage Range: The LM293H can operate within a wide range of supply voltages, making it suitable for various applications.
3. Low Input Bias Current: With an input bias current of only 25nA, the LM293H minimizes the impact on the input signal and reduces power consumption.
4. Output Compatibility: The output of the LM293H is compatible with TTL, MOS, and CMOS logic systems, enabling seamless integration into different circuit designs.

Advantages and Disadvantages

Advantages: - High input impedance ensures minimal loading of the input signal source. - Wide operating voltage range allows for versatile use in different electronic systems. - Low output saturation voltage reduces power dissipation and enhances overall efficiency.

Disadvantages: - Limited number of pins restricts the number of external connections that can be made. - Lack of built-in protection features may require additional circuitry for certain applications.

Working Principles

The LM293H operates based on the principles of voltage comparison. It compares the voltage levels at its two inputs and produces a digital output based on the result of the comparison. When the voltage at the non-inverting input (+IN) is higher than the voltage at the inverting input (-IN), the output switches to a high state. Conversely, when the voltage at the non-inverting input is lower than the voltage at the inverting input, the output switches to a low state.

Detailed Application Field Plans

The LM293H finds application in various fields, including but not limited to:

1. Level Shifting: The LM293H can be used to shift the voltage levels of digital signals, enabling compatibility between different logic families.
2. Waveform Generation: By comparing input voltages with reference levels, the LM293H can generate specific waveforms for signal processing applications.
3. Signal Conditioning: The LM293H is suitable for conditioning analog signals by comparing them with predetermined thresholds and producing corresponding outputs.

Detailed and Complete Alternative Models

1. LM393: This is a similar dual voltage comparator IC with slightly different specifications but compatible pin configuration.
2. LM339: Another alternative, the LM339, is a quad voltage comparator that offers four independent comparators in a single package.
3. LM311: The LM311 is a high-speed voltage comparator with differential inputs, making it suitable for more complex applications requiring precise comparisons.

These alternative models provide similar functionality to the LM293H and can be considered as substitutes based on specific requirements.

In conclusion, the LM293H is a versatile dual voltage comparator widely used in electronic circuits for various applications. Its wide operating voltage range, low input bias current, and output compatibility make it a reliable