LM339DG4

The LM339DG4 is a quad voltage comparator. It features four independent, high-voltage, high-accuracy comparators that have hysteric output for improved noise immunity. The device operates from a single supply voltage, ranging from 4.5 V to 16 V, making it ideal for use with a variety of regulated and unregulated power supplies. The LM339DG4 is well suited for precision control, monitoring and protection applications in industrial, automotive and medical systems.

Application Field

The LM339DG4 comparator has been designed to be used in a wide variety of applications, ranging from very simple to very complex. It is suitable for precision control, monitoring and protection applications in industrial, automotive and medical systems.

The LM339DG4 comparator can be used in systems that require the detection of voltage differences between two external signals. For example, it can be used for monitoring the current consumption of a motor - the output of the comparator will inform the system when the motor is consuming more than the acceptable amount of current. This could be useful in preventing motors from burning out due to overload.

The LM339DG4 comparator can also be used in systems that require the detection of temperature differences between two external sensors. For example, it can be used for the detection of temperature changes in home appliances. The output of the comparator will inform the system when the temperature of an appliance exceeds a set limit. This can help prevent malfunctions or hazardous conditions due to overheating.

The LM339DG4 comparator can also be used in automotive applications that require the detection of pressure or level differences between two points. For example, it can be used for monitoring engine oil pressure or coolant level in cars. The output of the comparator will inform the system when either of these levels exceed a specified limit. This is a vital safety function that helps prevent engines from running without proper lubrication or overheating due to lack of coolant.

Working Principle

The LM339DG4 comparator is a voltage comparator that continuously monitors the input signals and outputs a logic signal whenever the voltage of either of the inputs exceeds the other. The output state is controlled by two input pins: Input 1 and Input 2. If the voltage at Input 1 is greater than the voltage at Input 2, the output will be high. Conversely, if the voltage at Input 2 is greater than the voltage at Input 1, the output will be low.

The output of the LM339DG4 is also hysteretically operated. Hysteresis adds additional noise immunity to the comparator by ensuring that the output only changes if the difference between the two input voltages exceeds a certain amount. This prevents the output from switching back and forth rapidly if the two input voltages are near enough to each other.

The LM339DG4 comparator can also be used for applications that require monitoring for exceeding a threshold level. If the voltage at Input 1 exceeds the voltage at Input 2, the output will go high; when the voltage at Input 2 exceeds that at Input 1, the output will go low. This can be useful for applications that require monitoring temperature, pressure or level changes.

The LM339DG4 comparator is ideal for use in precision control, monitoring and protection applications in industrial, automotive and medical systems. Its wide operating range, hysteric output and noise immunity make it well suited for use in these and other applications.