LM339DTBR2

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Type:	General Purpose
Number of Elements:	4
Output Type:	CMOS, Open-Collector, TTL
Voltage - Supply, Single/Dual (±):	3 V ~ 36 V, ±1.5 V ~ 18 V
Voltage - Input Offset (Max):	5mV @ 5V
Current - Input Bias (Max):	0.25µA @ 5V
Current - Output (Typ):	16mA @ 5V
Current - Quiescent (Max):	2.5mA
CMRR, PSRR (Typ):	--
Propagation Delay (Max):	--
Hysteresis:	--
Operating Temperature:	0°C ~ 70°C
Package / Case:	14-TSSOP (0.173", 4.40mm Width)
Mounting Type:	Surface Mount
Supplier Device Package:	14-TSSOP
Base Part Number:	LM339

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LM339DTBR2 Application Field and Working Principle

The LM339DTBR2 is a very innovative and powerful analog linear-comparator used for applications such as temperature control, over-temperature protection, alarm systems, and range-switching. Developed by Texas Instruments, it is designed as a drop-in replacement for existing comparators and is also capable of replacing other functional elements used in various applications.The LM339DTBR2 linear-comparator operates by applying an input signal to the two different input pins which are connected to a differential amplifier. Depending on the comparison of the two signals, the outputs of the comparator will be either reflective of the high or low level of the signals. The overall operation is considered to be higher speed than other competing products and is further capable of providing higher signal gain than traditional comparators.The basic block diagram of the LM339DTBR2 linear-comparator is shown in Figure 1. It consists of a differential input stage and two emitter followers. The differential input stage, composed of the two main transistors which are the amplifying elements in the design, acts as an amplifier providing the high input impedance required. The output stage acts as two emitter followers, one of which is the inverting follower and the other the non-inverting follower. The two stages are connected together through a diode reference, which is utilised as part of the input error amplifier.

Figure 1: Basic block diagram of the LM339DTBR2 linear-comparator

The overall design of the LM339DTBR2 is fabricated on a monolithic integrated circuit (IC) utilizing bipolar transistors with a reliable silicon gate implementation. This design allows for very high operating speed and efficient encoding of analog circuits on the chip.In terms of its operation, the LM339DTBR2 comparator compares the level of the input signals and, depending on the comparison, provides positive or negative outputs at the output pins. This occurs when the differential amplifier stage has the output voltage exceed the reference voltage, which is applied to the reference pin. When the output voltage is higher than the reference voltage, the positive output pin will be asserted high and the negative output pin will be asserted low. Similarly, when the output voltage is lower than the reference voltage, the negative output pin will be asserted high and the positive output pin will be asserted low.In general, the LM339DTBR2 linear-comparator offers users a convenient and reliable solution for temperature control and the detection of over-temperature conditions. Its low voltage capability and high speed operation make it a particularly useful tool for applications requiring precise sensing, such as thermostats, motor controllers, and other systems where accurate temperature control is required. Additionally, its integrated noise protection and low quiescent current allows it to be implemented in sensitive and noise-prone applications.

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