LM339S Quad Comparator Datasheet, Features, Pinout, and Applications

Comparators are crucial in electronic circuits for their ability to compare two voltages and output a digital signal based on the comparison. This functionality is fundamental in applications requiring precise voltage monitoring and control. The LM339S, in particular, is valued for its low power consumption, wide supply voltage range, and ability to operate with a single or dual power supply. These features make it suitable for battery-operated devices, industrial control systems, and other applications where efficiency and reliability are paramount. In this article, we'll provide a comprehensive guide to the LM339S quad comparator, exploring its datasheet, features, pinout, applications, equivalents, and more details.

Overview of the LM339S

The LM339S is a monolithic integrated circuit containing four independent voltage comparators. It is designed to operate from a single power supply over a wide range of voltages. It is commonly used in industrial, automotive, and consumer applications for comparing voltages.

Specifications and Features

LM339S Specifications

• Supply Voltage Range: 2V to 36V

• Input Offset Voltage: 2 mV (typical)

• Input Bias Current: 25 nA (typical)

• Response Time: 1.3 µs

• Operating Temperature Range: -40°C to 125°C; 0°C to 70°C

• Package: 14-pin SOIC, TSSOP, and DIP

LM339S Features

• Wide Supply Voltage Range: Operates from 2V to 36V.

• Low Power Consumption: Ideal for battery-powered applications.

• Low Input Bias Current: Reduces error in high-impedance circuits.

• Low Offset Voltage: Ensures accurate voltage comparisons.

• Open-Collector Output: Allows for wired-AND connections and interfacing with different logic levels.

• Wide Operating Temperature Range: Suitable for industrial and automotive applications.

LM339S Pinout

Pin Configuration and Numbering

The LM339S is available in a 14-pin SOIC, TSSOP, and DIP package. The pin configuration is as follows:

Pin Name	Description	Function
V+	Supply Voltage	Powers the IC
GND	Ground	Ground reference for the IC
IN1+	Non-Inverting Input 1	Non-inverting input of comparator 1
IN1-	Inverting Input 1	Inverting input of comparator 1
OUT1	Output 1	Output of comparator 1
IN2+	Non-Inverting Input 2	Non-inverting input of comparator 2
IN2-	Inverting Input 2	Inverting input of comparator 2
OUT2	Output 2	Output of comparator 2
IN3+	Non-Inverting Input 3	Non-inverting input of comparator 3
IN3-	Inverting Input 3	Inverting input of comparator 3
OUT3	Output 3	Output of comparator 3
IN4+	Non-Inverting Input 4	Non-inverting input of comparator 4
IN4-	Inverting Input 4	Inverting input of comparator 4
OUT4	Output 4	Output of comparator 4

Functions of Each Pin

• V+: Powers the IC with a supply voltage ranging from 2V to 36V.

• GND: The ground pin serves as the reference point for all internal circuits.

• IN1+, IN2+, IN3+, IN4+: Non-inverting inputs of comparators 1 to 4.

• IN1-, IN2-, IN3-, IN4-: Inverting inputs of comparators 1 to 4.

• OUT1, OUT2, OUT3, OUT4: Outputs of comparators 1 to 4, which are open-collector outputs capable of sinking current.

LM339S Equivalents

Comparison with Equivalent Components

Equivalent components to the LM339S include the LM2901, LM3302, and LM393. These comparators offer similar functionality and performance characteristics but may vary in terms of operating voltage range, power consumption, and package options.

Compatibility with Other Comparators

The LM339S is compatible with other comparators in the LM339 family, allowing for flexibility in design and application.

Interchangeability in Electronic Circuits

The LM339S can be interchanged with other quad comparators in the LM339 family and similar families like LM2901 and LM393 for applications requiring voltage comparison.

LM339S Applications

Voltage Level Detection

The LM339S is widely used in voltage level detection applications, where it compares input voltages against reference voltages to determine high or low states.

Zero-Crossing Detectors

In zero-crossing detector circuits, the LM339S is used to detect the point where an AC signal crosses zero volts, which is essential for phase-locked loops and other timing-related applications.

Oscillators

The LM339S can be used in oscillator circuits to generate square wave signals by comparing the voltage of a capacitor charging and discharging through a resistor.

Pulse Width Modulation (PWM) Controllers

In PWM applications, the LM339S compares a modulating signal with a reference signal to control the duty cycle of the PWM output, used in motor speed controls and switching power supplies.

Limit Comparators

The LM339S functions as a limit comparator in industrial control systems, where it ensures that process variables stay within specified limits, triggering alarms or corrective actions if limits are exceeded.

Window Comparators

The LM339S can be configured as a window comparator to check if an input voltage lies within a specific range, outputting a signal if the voltage is within the set limits.

LM339S Advantages and Disadvantages

Advantages:

• Quad comparator in a single package saves space and cost.

• Wide supply voltage range allows for versatile applications.

• Low input bias current and offset voltage enhance accuracy.

• Open-collector outputs enable easy interfacing with different logic levels.

Disadvantages:

• Open-collector outputs require pull-up resistors, which may complicate circuit design.

• Response time may not be suitable for very high-speed applications.

LM339S Package

The LM339S is available in 14-pin SOIC, TSSOP, and DIP packages, suitable for both surface-mount and through-hole applications. These packages facilitate easy integration into various designs, catering to different manufacturing preferences.

LM339S Datasheet

The LM339S datasheet provides detailed information on electrical characteristics, including input and output parameters, supply voltage ratings, and thermal resistance. Graphs in the datasheet illustrate the performance under different operating conditions, aiding in design and implementation.

LM339S vs. LM393

Comparison of Features and Specifications

• LM339S: Quad comparator, wide supply voltage range (2V to 36V), low input bias current, low offset voltage, open-collector outputs.

• LM393: Dual comparator, similar supply voltage range, low input bias current, low offset voltage, open-collector outputs.

Differences in Performance and Functionality

The primary difference between the LM339S and the LM393 is the number of comparators. The LM339S offers four comparators in one package, whereas the LM393 offers two. This makes the LM339S more suitable for applications requiring multiple comparisons.

Suitability for Different Applications

The LM339S is ideal for applications needing multiple voltage comparisons in a single IC, such as complex control systems. The LM393, with fewer comparators, is suitable for simpler applications with fewer comparison requirements.

LM339 vs LM324

• Functionality: The LM339 is a quad comparator, while the LM324 is a quad operational amplifier (op-amp). Although they are used in similar applications, their functionalities differ; comparators are primarily used for comparing voltages, whereas op-amps are used for a wide range of analog signal processing tasks.

• Output Type: The LM339 has open-collector outputs, which require external pull-up resistors, making it suitable for wired-AND logic functions. The LM324 has push-pull outputs, which can source or sink current, making it more versatile for various analog output applications.

• Voltage Range: Both components operate over a wide voltage range, but the LM339 is often preferred for applications that require strict voltage comparison rather than amplification or signal conditioning.

LM339 vs LM2901

• Temperature Range: The LM2901 is designed to operate over a broader temperature range compared to the LM339, making it more suitable for automotive and industrial applications where environmental conditions can be extreme.

• Electrical Characteristics: Both components share similar electrical characteristics and functionality, as they are both quad comparators. However, the LM2901 may have enhanced performance metrics, such as improved offset voltage and better temperature stability, which are crucial in high-precision applications.

• Cost and Availability: The LM339 is widely available and cost-effective, making it a popular choice for general-purpose applications. The LM2901, with its enhanced specifications, might be slightly more expensive but offers better performance in demanding environments.

Conclusion

The LM339S is a versatile and reliable quad comparator IC that serves a wide range of applications, from voltage level detection to PWM control and industrial limit monitoring. Its ease of use, combined with low power consumption and accurate performance, makes it a valuable component in electronic designs. Texas Instruments' commitment to quality ensures the LM339S provides consistent and dependable results in various environments.

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