Everything You Need To Know About LM339 Comparator

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The LM339 Comparator is an integrated circuit device used in various electronic circuits to compare two voltage levels.

It is a part of the LM339 family of devices, which includes other comparators such as the LM339A and LM339E.

The LM339 is a single-supply voltage comparator, meaning that it can be powered by a single voltage source.

It is commonly used in applications such as waveform generation, temperature sensing, over-voltage and under-voltage detection, and many more.

How does LM339 Comparator work?

Now let’s discuss the working principle of LM339 Comparator. The LM339 Comparator is a very popular integrated circuit commonly used for comparing two input voltages. It has four independent voltage comparators with open-collector outputs.

The open-collector outputs can be used either as open-drain outputs for wired-OR connection or as open-emitter outputs to drive high-current loads.

The inputs of the comparator are connected to two voltage sources and the output will indicate the relative voltage levels of the two inputs.

When the voltage at the non-inverting input is greater than the voltage at the inverting input, the output will be high and vice versa.

When the non-inverting input voltage is greater, the output of the comparator will be high and the output will be low when the inverting input voltage is greater. The LM339 comparator also features hysteresis, which means that the output will remain high or low even if the input voltage is close to the switching threshold. This helps to reduce the noise in the output signal.

With this working principle, it means that the LM339 comparator can be used in a wide variety of applications that require some form of voltage sensing and comparison.

LM339 Pin Configuration

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LM339 comparator is a 14-pin device and let’s discuss its pin configuration.

-Pin 1: This is called the 1OUT pin and is the output pin of comparator 1. This pin gives the output voltage which is either high or low depending upon the comparator’s output.

-Pin 2: Named 2OUT, this is the output pin of the comparator 2. The pin gives the output voltage which is either high or low depending upon the comparator’s output.

-Pin 3: This is the VCC pin. This means that this pin is used to provide the supply voltage to the comparator.

-Pin 4(2IN): This is the inverting input of the comparator 2 and is used to provide the reference voltage.

-Pin 5(1IN): This is the non-inverting input of comparator 1 and is used to provide the input voltage.

-Pin 6: This is the Ground pin and is used to provide the ground connection to the comparator.

-Pins 7 & 10: These are the offset null pins, which are used to adjust the offset voltage of the comparator.

-Pins 8 & 11: These are the hysteresis control pins, which can be used to adjust the hysteresis voltage of the comparator.

-Pins 9 & 12: These are the supply voltage pins, which are used to provide the supply voltage to the comparator.

-Pins 13 & 14: These are the non-inverting input pins of the comparator 1 and comparator 2, respectively. They are used to provide the input voltage to the comparator.

LM339 Comparator Key Parameters

Here are the basic parameters of LM339 comparators

-Supply voltage(Vcc) = 5V to 36V

-Input offset voltage = 2mV

-Output voltage = 0V to 36V

-Input common mode voltage range = 0V to Vcc-1.5V

-Propagation Delay = 15ns

-Input Bias Current = 0.5mA

-Power Dissipation = 500mW

-Operating Temperature Range = -40°C to +85°C

-Package Type = DIP, SOIC, SOT-23

Features and Electrical Characteristics of LM339 Comparator

Let’s look at the key features that make the LM339 comparator perfect for its application areas.

 Four individual voltage comparators

Yes, LM339 comprises of four independent, high gain, internally frequency compensated comparators. This feature allows the device to be used to compare voltage signals in a variety of applications.

Wide Supply Voltage Range

The LM339 comparator has an exceptionally wide supply voltage range of 3V to 32V. This wide range allows it to be used in different applications without any voltage compatibility issues.

Low Input Bias Current

LM339 comparator has a very low input bias current of less than 50nA. This low input bias current helps to ensure accurate voltage comparison over a wide range of temperatures.

High Output Current

The  comparator can supply up to 50mA of output current. This high output current allows it to drive a variety of loads, making it suitable for various applications.

High Common Mode Rejection Ratio

The LM339 comparator has a high common mode rejection ratio (CMRR) of up to 60dB. This high CMRR helps to ensure accurate voltage comparison even in noisy environments.

Dual Supply Operation

The comparator has a dual supply operation of +18V and -18V. Dual supply refers to the ability to operate the comparator using two separate power supplies. This helps to reduce the power consumption of the comparator and is useful in applications that require low power consumption.

Pb−Free, Halogen Free

LM339 voltage comparator is Pb−Free and halogen free, meaning it does not contain lead or halogen, which are hazardous materials. Why does this matter? Well, it makes the comparator more environmentally friendly and safer to use.

RoHS compliant

RoHS is a European directive that restricts the use of certain hazardous materials in electrical and electronic equipment. The LM339 comparator is RoHS compliant, meaning it does not contain any of the restricted materials.

Applications of LM339 Comparator

Here are some common LM339 application areas.

-Oscillators: They are normally used to create a square wave oscillator circuit.

-Voltage/Current Monitoring: The comparators are used to sense when the voltage or current exceed certain levels and can be used to trigger an alarm or other action. -Voltage Regulation: Here, they are used to sense when an output voltage exceeds a certain level and then take some action to bring it back into the desired range.

-Signal Detection: The comparator can be used to detect and amplify small signals in noisy environments.

-Pulse Width Modulation: The comparator can be used to generate PWM signals for controlling motor speed, LED brightness, etc.

-Data Acquisition: They can be used to acquire data from different sources such as sensors, analog-to-digital converters, etc.

Buy LM339 Comparator in China

At this point, you should e ready to get the best LM339 comparator in China. The most important part is choosing the best suppliers for these electronic components. This is where ICRFQ comes in.

At ICRFQ, we are the leading  electronic components sourcing agent in China. We have a wide selection of LM339 comparators from the best manufacturers. Simply contact us and we will deliver.

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