LM339DE4

Current - Input Bias (Max):	0.25µA @ 5V
Base Part Number:	LM339
Supplier Device Package:	14-SOIC
Mounting Type:	Surface Mount
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Operating Temperature:	0°C ~ 70°C
Hysteresis:	--
Propagation Delay (Max):	--
CMRR, PSRR (Typ):	--
Current - Quiescent (Max):	2.5mA
Current - Output (Typ):	20mA
Series:	--
Voltage - Input Offset (Max):	5mV @ 30V
Voltage - Supply, Single/Dual (±):	2 V ~ 30 V, ±1 V ~ 15 V
Output Type:	CMOS, MOS, Open-Collector, TTL
Number of Elements:	4
Type:	Differential
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tube

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Introduction

LM339DE4 is a type of Analog Devices’ low-power CMOS comparator with a rail-to-rail input stage, offering lower input bias and offset currents than traditional CMOS devices. This comparator is designed for low-voltage, low-power applications where space and power are critical. It has a wide range of applications, including in industrial controls, alarms, sensing applications, and power supplies.

Application Field

The LM339DE4 comparator can be used in a wide variety of applications where low power and small size are important. Some popular applications include:-Voltage detecting: The LM339DE4 can detect the presence of a low voltage with high accuracy and low power consumption. It can be used in battery-operated systems, such as microcontrollers, to detect low voltage inputs. -Current sensing: The rail-to-rail input range of the LM339DE4 makes it ideal for sensing current. It can be used in current-limiting circuits, inverters, and motor control circuits.-ON/OFF control: The comparator can be used to shut down a system in the event of an overvoltage or overcurrent condition. It can also be used to control output switching, alarms, and timers. -Temperature sensing: The low-power operation and wide input range of the LM339DE4 make it an ideal choice for detecting temperature changes. It can be used in applications such as medical equipment and home appliances.

Working Principle

The LM339DE4 comprises two identical, independent, voltage comparators. Each comparator has an input (Vin) and an output (Vout). The output of each comparator is either logic low when its input is less than the reference voltage Vref, or logic high when its input is greater than the reference voltage. The comparator’s output can be inverted on demand if required.The LM339DE4 also has a ground pin (GND), which is connected to the system’s ground potential. The ground pin is usually connected to the low side of the supply voltage.The input pins of the LM339DE4 are connected to the two signals to be compared, i.e., Vin1 and Vin2. These pins are typically connected to the higher side of the supply voltage. The reference voltage (Vref) is connected to the third input pin. When a signal on one of the input pins rises above the reference voltage, the corresponding output will go high, indicating that the two signals have reached a predetermined voltage difference. When the signal on one of the input pins drops below the reference voltage, the corresponding output will go low, again indicating that the two signals have reached a predetermined voltage difference. The rail-to-rail input stage of the LM339DE4 allows for higher accuracy and lower input bias and offset currents than with traditional CMOS devices.

Conclusion

The LM339DE4 is a low-power CMOS comparator from Analog Devices with a rail-to-rail input stage. It is designed for low voltage, low power applications with demanding space and power requirements. The comparator offers ultra-low input bias and offset currents, making it ideal for a variety of applications, including voltage detecting, current sensing, ON/OFF control, and temperature sensing. The working principle of the LM339DE4 is based on two independent comparators, each with their own input pins, ground pin, and reference voltage pin. The output of the comparator is either logic low or logic high, depending on whether the input voltage is above or below the reference voltage.

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