SN74HCT08DE4

Current - Output High, Low:	4mA, 4mA
Base Part Number:	74HCT08
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	14-SOIC
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Max Propagation Delay @ V, Max CL:	22ns @ 5.5V, 50pF
Logic Level - High:	2V
Logic Level - Low:	0.8V
Series:	74HCT
Current - Quiescent (Max):	2µA
Voltage - Supply:	4.5 V ~ 5.5 V
Features:	--
Number of Inputs:	2
Number of Circuits:	4
Logic Type:	AND Gate
Part Status:	Active
Packaging:	Tube

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The SN74HCT08DE4 is a quad 2-input positive OR gate that has replaced the original SN74HCT00DE4. It consists of four, two-input OR gates, each with Schmitt-trigger inputs for increased noise immunity. The SN74HCT08DE4 includes protection circuitry each gate against power supply voltage spikes, excessive current from output short circuits, and electrostatic discharge (ESD). As of Aug 2020, the SN74HCT08DE4 is produced by 8 companies including TI, STMicroelectronics, NXP Semiconductors, Analog Devices, and other major manufacturers.The SN74HCT08DE4 belongs to the family of logic gates and inverters, which are digital devices used to perform logical operation such as OR, AND, NOR, and XOR at a single operation. A logic gate is a device which can produce either a logical 1 or 0 based on the inputs given to it. Logic gates are used in digital circuits and systems to perform specific functions and operations. The SN74HCT08DE4, specifically, is a quad 2-input positive OR gate, with Schmitt-trigger inputs. It is also known as a 4 to 2 line OR chaingate with Schmitt-trigger inputs. The figure below illustrates an example of how the SN74HCT08DE4 could be used to create a larger AND gate. In this example, it has two inputs A and B and one output O.The SN74HCT08DE4 works in such a way that when either of the two inputs is high, it will produce a high output, when both inputs are low, it will produce a low output (see truth table below). This ensures that if any of the inputs go high, then the output will go high.

A	B	O
0	0	0
0	1	1
1	0	1
1	1	1

The SN74HCT08DE4 has many applications in digital logic and design, such as switching and logic circuits, memory in computer systems, logic associated with microcontroller units (MCUs) and memory address decoding. The SN74HCT08DE4 incorporates ESD protection against the greatest surge of Electrostatic Discharge (ESD) up to 2kV on each gate and the output voltage, which reduces the sensitivity of the integrated circuit to voltages greater than the nominal supply voltage. It can also function at temperatures ranging from -40°C to +125°C, making it suitable for a wide range of applications. In conclusion, the SN74HCT08DE4 is a versatile and cost-effective 2-input positive OR gate. It is available in various packages and can operate at a wide range of temperatures, making it suitable for various applications. The device also comes with ESD protection which helps to reduce the sensitivity of the integrated circuit to voltages higher than the nominal supply voltage.

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