Logic Gates

Logic gates are physical components in a circuit that control the flow of a signal by implementing a Boolean function, processing a signal to binary information. Logic gates are foundational in logic circuits, or in any electronic circuit process that involves digital to analogue signal conversion, or the flow of digital information. Logic gates are primarily implemented using diodes or transistors as electrical switches, but can also be constructed using electromagnetic relays (relay logic), vacuum tubes, optics, molecules, fluidic logic, pneumatic logic, or even mechanical elements.

Types of Logic Gate

Logic gates have distinct logic functions. The most common of these are known as basic gates. These include:

  • AND Gates - these gates have multiple inputs that are processed into a single signal output depending on the positive combination of high signals in the inputs. It will only produce a high signal if both inputs register as high (e.g. two ones will result in a one, otherwise, it will have an output of zero).
  • OR Gates - similar to the AND gate, an OR gate has multiple inputs and a single output. In this case, it does not require a positive combination of one signals but will implement logical produce a high signal if one or all of the inputs are high. (e.g a one and a zero, or two ones, may produce a high signal, but two zeros will produce zeros.)
  • NOT Gates -also known as inverters, the NOT gates will process the signal as the opposite of its value (eg. a one will invert as a zero, and a zero will invert as a 1.)

There are also combined function logic gates that modify typical functions with an inversion.

  • NAND Gate - unlike an AND gate, NAND will process two high signals as a zero and all other combinations as a one.
  • NOR Gate - unlike an OR gate, this will produce a one if the inputs register a zero signal in any combination, rather than a high signal.
  • Buffer Gate - a buffer logic gate behaves in the opposite manner of a NOT gate, in that it passes a signal unchanged from input to output.

Applications

As CPUs employ binary logic, logic gates are essentially the building blocks of computers. As such, they can be found in many kinds of digital circuits such as:

  • Encoders & Decoders
  • Multiplexers & Demultiplexers
  • Full and half adders

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Description Price Logic Function Mounting Type Number of Elements Number of Inputs per Gate Schmitt Trigger Input Package Type Pin Count Logic Family Input Type Maximum Operating Supply Voltage Maximum High Level Output Current Maximum Propagation Delay Time @ Maximum CL Minimum Operating Supply Voltage Maximum Low Level Output Current
RS Stock No. 709-2968
Mfr. Part No.CD4011UBE
$0.786
Each (In a Pack of 10)
units
NAND Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 120 ns @ 5 V, 50 ns @ 15 V, 60 ns @ 10 V 3 V 4.2mA
RS Stock No. 923-6801
Mfr. Part No.CD4011UBE
$0.91
Each (In a Tube of 25)
units
NAND Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 120 ns @ 5 V, 50 ns @ 15 V, 60 ns @ 10 V 3 V 4.2mA
RS Stock No. 709-2371
Mfr. Part No.CD4082BE
$0.812
Each (In a Pack of 20)
units
AND Through Hole 2 4 No PDIP 14 4000 - 18 V -4.2mA 120 ns @ 10 V, 250 ns @ 5 V, 90 ns @ 15 V 3 V 4.2mA
RS Stock No. 145-0008
Mfr. Part No.CD4082BE
$0.812
Each (In a Tube of 25)
units
AND Through Hole 2 4 No PDIP 14 4000 - 18 V -4.2mA 120 ns @ 10 V, 250 ns @ 5 V, 90 ns @ 15 V 3 V 4.2mA
RS Stock No. 527-132
Mfr. Part No.CD4002BE
$0.812
Each (In a Tube of 25)
units
NOR Through Hole 2 4 No PDIP 14 4000 - 18 V -4.2mA 120 ns @ 10 V, 250 ns @ 5 V, 90 ns @ 15 V 3 V 4.2mA
RS Stock No. 796-7941
Mfr. Part No.CD4072BE
$0.972
Each (In a Pack of 25)
units
OR Through Hole 2 4 No PDIP 14 4000 CMOS 18 V -4.2mA 250 ns @ 50 pF 3 V 4.2mA
RS Stock No. 368-5884
Mfr. Part No.SN74LS00N
$1.166
Each (In a Tube of 25)
units
NAND Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.4mA 15 ns @ 5 V 4.75 V 8mA
RS Stock No. 307-604
Mfr. Part No.SN74LS86AN
$1.43
Each
units
XOR Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.4mA 30 ns @ 5 V 4.75 V 8mA
RS Stock No. 170-7964
Mfr. Part No.HEF4093BT,653
BrandNexperia
$0.205
Each (On a Reel of 2500)
units
NAND Surface Mount 4 2 Yes SO 14 HEF Schmitt Trigger 15 V -4.2mA 185 ns @ 50 pF 3 V 4.2mA
RS Stock No. 124-2313
Mfr. Part No.HEF4093BT,652
BrandNexperia
$0.79
Each (In a Tube of 57)
units
NAND Surface Mount 4 2 Yes SOIC 14 4000 Schmitt Trigger 15 V -4.2mA 185 ns @ 5 V, 60 ns @ 15 V, 80 ns @ 10 V 3 V 4.2mA
RS Stock No. 307-496
Mfr. Part No.SN74LS02N
$1.66
Each
units
NOR Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.4mA 15 ns @ 5 V 4.75 V 8mA
RS Stock No. 355-9167
Mfr. Part No.HEF4093BT,652
BrandNexperia
$1.08
Each
units
NAND Surface Mount 4 2 Yes SOIC 14 4000 Schmitt Trigger 15 V -4.2mA 185 ns @ 5 V, 60 ns @ 15 V, 80 ns @ 10 V 3 V 4.2mA
RS Stock No. 179-2201
Mfr. Part No.CD74AC32M96
$1.014
Each (In a Tube of 50)
units
OR Surface Mount 4 2 No SOIC 14 AC CMOS 5.5 V -24mA 119ns 1.5 V 24mA
RS Stock No. 162-7421
Mfr. Part No.SN74LV08APWR
$0.15
Each (On a Reel of 2000)
units
AND Surface Mount 4 2 No TSSOP 14 LV - 5.5 V -12mA 12.3 ns @ 3.3 V, 17.3 ns @ 2.5 V, 7.9 ns @ 5 V 2 V 12mA
RS Stock No. 541-9673
Mfr. Part No.TC4081BP(F)
BrandToshiba
$1.36
Each (In a Pack of 5)
units
AND Through Hole 4 2 No PDIP 14 4000 - 18 V -4mA 100 ns @ 10 V, 200 ns @ 5 V, 80 ns @ 15 V 3 V 4mA
RS Stock No. 144-9972
Mfr. Part No.SN74HC11NE4
$0.344
Each (In a Tube of 25)
units
AND Through Hole 3 3 No PDIP 14 HC - 6 V -5.2mA 100 ns @ 2 V, 17 ns @ 6 V, 20 ns @ 4.5 V 2 V 5.2mA
RS Stock No. 662-8405
Mfr. Part No.SN74LV08APWR
$0.544
Each (In a Pack of 10)
units
AND Surface Mount 4 2 No TSSOP 14 LV - 5.5 V -12mA 12.3 ns @ 3.3 V, 17.3 ns @ 2.5 V, 7.9 ns @ 5 V 2 V 12mA
RS Stock No. 166-2421
Mfr. Part No.74AC08SCX
Brandonsemi
$0.401
Each (On a Reel of 2500)
units
AND Surface Mount 4 2 No SOIC 14 AC - 6 V -24mA 10ns 2 V 24mA
RS Stock No. 100-0760
Mfr. Part No.SN74HC08N
$0.872
Each (In a Tube of 25)
units
AND Through Hole 4 2 No PDIP 14 HC - 6 V -5.2mA 100 ns @ 2 V, 17 ns @ 6 V, 20 ns @ 4.5 V 2 V 5.2mA
RS Stock No. 663-1906
Mfr. Part No.SN74HC11NE4
$0.801
Each (In a Pack of 10)
units
AND Through Hole 3 3 No PDIP 14 HC - 6 V -5.2mA 100 ns @ 2 V, 17 ns @ 6 V, 20 ns @ 4.5 V 2 V 5.2mA