LM139N

Current - Output (Typ):	16mA @ 5V
Base Part Number:	LM139
Supplier Device Package:	14-DIP
Mounting Type:	Through Hole
Package / Case:	14-DIP (0.300", 7.62mm)
Operating Temperature:	-55°C ~ 125°C
Hysteresis:	--
Propagation Delay (Max):	--
CMRR, PSRR (Typ):	--
Current - Quiescent (Max):	2mA
Series:	--
Current - Input Bias (Max):	0.25µA @ 5V
Voltage - Input Offset (Max):	5mV @ 30V
Voltage - Supply, Single/Dual (±):	2 V ~ 32 V, ±1 V ~ 16 V
Output Type:	CMOS, DTL, ECL, MOS, Open-Collector, TTL
Number of Elements:	4
Type:	General Purpose
Part Status:	Obsolete
Packaging:	Tube

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Introduction

Linear - Comparators are semiconductor devices used extensively in signal processing applications, as they are capable of comparing analog voltages and making decisions based on their relative values. The most commonly used type of linear - comparator device is the LM139N, which is a type of integrated circuit. The LM139N device is primarily used for monitoring smaller signals, and its application fields are quite broad.

LM139N Application Fields

The most commonly used applications of the LM139N device are in the fields of automotive electronics, medical instrumentation, digital logic, control systems, and power management systems. The devices are designed for low voltage operations and are often employed in automotive devices such as tachographs, oil pressure sensors, or electric power steering. It’s also used to monitor the voltage level in batteries and other power supplies, such as photovoltaic cells and thermocouples. Additionally, LM139N is used to provide logic controls in medical instrumentation and testing systems, as well as controlling high speed motors in industrial and robotic applications.

LM139N Working Principle

The LM139N device uses a differential input structure, where the input voltages of two transistors are compared. When the input voltages are equal, the output of the comparator is high, while when they are unequal, the output of the comparator is low. This is the most basic operation of a linear - comparator. The LM139N device is usually configured as a window comparator, in which two specific voltage levels are to be compared. The lower voltage is serviced as one input, while the higher voltage is serviced as the second input. When the lower voltage is the same as the higher voltage, the output of the comparator is turned high, while when the lower voltage is greater than the higher voltage, the output is turned low. Additionally, the comparator has an internal voltage reference to protect the device from high voltages at the inputs, allowing it to be used in many harsh environments.

Conclusion

The LM139N is an extremely versatile linear - comparator device. Its application fields are broad and its ability to accurately compare input voltages makes it incredibly useful for a variety of purposes. Its relatively low voltage operation makes it ideal for many automotive, medical, and industrial uses, and its internal voltage reference ensures the device remains protected from high voltages. The LM139N’s ability to accurately compare voltages and make decisions quickly makes it a great choice for many applications.

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