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. 166-0006
Mfr. Part No.74HC2G08DP,125
BrandNexperia
$0.194
Each (On a Reel of 3000)
units
AND Surface Mount 2 2 No TSSOP 8 HC CMOS 6 V -5.2mA 110 ns @ 15 pF 2 V 5.2mA
RS Stock No. 922-2892
Mfr. Part No.CD4001UBE
$0.66
Each (In a Tube of 25)
units
NOR Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 50 ns @ 15 V, 60 ns @ 10 V, 120 ns @ 5 V 3 V 4.2mA
RS Stock No. 662-9483
Mfr. Part No.CD4001UBE
$0.724
Each (In a Pack of 10)
units
NOR Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 50 ns @ 15 V, 60 ns @ 10 V, 120 ns @ 5 V 3 V 4.2mA
RS Stock No. 144-9955
Mfr. Part No.CD74HCT132E
$0.606
Each (In a Tube of 25)
units
NAND Through Hole 4 2 Yes PDIP 14 HCT Schmitt Trigger 5.5 V -4mA 33 ns @ 4.5 V 4.5 V 4mA
RS Stock No. 368-5884
Mfr. Part No.SN74LS00N
$0.932
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. 179-2129
Mfr. Part No.SN74HC03DR
$0.459
Each (In a Tube of 50)
units
NAND Surface Mount 4 2 No SOIC 14 HC - 6 V -0.005mA 23 ns @ 6 V, 25 ns @ 4.5 V, 105 ns @ 2 V 2 V 5.2mA
RS Stock No. 662-8077
Mfr. Part No.SN74HC03DR
$0.459
Each (In a Pack of 10)
units
NAND Surface Mount 4 2 No SOIC 14 HC - 6 V -0.005mA 23 ns @ 6 V, 25 ns @ 4.5 V, 105 ns @ 2 V 2 V 5.2mA
RS Stock No. 813-9238
Mfr. Part No.74AHC2G08DP,125
BrandNexperia
$0.552
Each (On a Tape of 30)
units
AND Surface Mount 2 2 No TSSOP 8 AHC CMOS 5.5 V -8mA 16 ns @ 50 pF 2 V 8mA
RS Stock No. 518-9164
Mfr. Part No.MC14081BDG
$0.90
Each
units
AND Surface Mount 4 2 No SOIC 14 4000 - 18 V -4.2mA 100 ns @ 15 V, 130 ns @ 10 V, 300 ns @ 5 V 3 V 4.2mA
RS Stock No. 178-4794
Mfr. Part No.MC14081BDG
$0.599
Each (In a Tube of 55)
units
AND Surface Mount 4 2 No SOIC 14 4000 - 18 V -4.2mA 100 ns @ 15 V, 130 ns @ 10 V, 300 ns @ 5 V 3 V 4.2mA
RS Stock No. 217-5645
Mfr. Part No.SN74HC32N
$0.76
Each
units
OR Through Hole 4 2 No PDIP 14 HC - 6 V -5.2mA 17 ns @ 6 V, 20 ns @ 4.5 V, 100 ns @ 2 V 2 V 5.2mA
RS Stock No. 165-9926
Mfr. Part No.74AHC2G08DP,125
BrandNexperia
$0.267
Each (On a Reel of 3000)
units
AND Surface Mount 2 2 No TSSOP 8 AHC CMOS 5.5 V -8mA 16 ns @ 50 pF 2 V 8mA
RS Stock No. 688-1521
Mfr. Part No.MC14081BDR2G
$0.762
Each (In a Pack of 5)
units
AND Surface Mount 4 2 No SOIC 14 4000 - 18 V -4.2mA 100 ns @ 15 V, 130 ns @ 10 V, 300 ns @ 5 V 3 V 4.2mA
RS Stock No. 527-069
Mfr. Part No.CD4070BE
$0.734
Each (In a Tube of 25)
units
XOR Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 100 ns @ 15 V, 130 ns @ 10 V, 280 ns @ 5 V 3 V 4.2mA
RS Stock No. 100-0761
Mfr. Part No.SN74HC32N
$0.678
Each (In a Tube of 25)
units
OR Through Hole 4 2 No PDIP 14 HC - 6 V -5.2mA 17 ns @ 6 V, 20 ns @ 4.5 V, 100 ns @ 2 V 2 V 5.2mA
RS Stock No. 663-1871
Mfr. Part No.SN74HC03D
$0.575
Each (In a Pack of 10)
units
NAND Surface Mount 4 2 No SOIC 14 HC - 6 V -0.005mA 23 ns @ 6 V, 25 ns @ 4.5 V, 105 ns @ 2 V 2 V 5.2mA
RS Stock No. 527-924
Mfr. Part No.CD40107BE
$0.752
Each (In a Tube of 50)
units
NAND Through Hole 2 2 No PDIP 8 4000 - 18 V - 100 ns @ 15 V, 120 ns @ 10 V, 200 ns @ 5 V 3 V 89mA
RS Stock No. 170-3418
Mfr. Part No.MC14081BDR2G
$0.189
Each (On a Reel of 2500)
units
AND Surface Mount 4 2 No SOIC 14 4000 - 18 V -4.2mA 100 ns @ 15 V, 130 ns @ 10 V, 300 ns @ 5 V 3 V 4.2mA
RS Stock No. 179-2171
Mfr. Part No.SN74HC03D
$0.599
Each (In a Tube of 50)
units
NAND Surface Mount 4 2 No SOIC 14 HC - 6 V -0.005mA 23 ns @ 6 V, 25 ns @ 4.5 V, 105 ns @ 2 V 2 V 5.2mA
RS Stock No. 103-8165
Mfr. Part No.74HC00D,652
BrandNexperia
$0.426
Each (In a Tube of 57)
units
NAND Surface Mount 4 2 No SOIC 14 HC - 6 V -5.2mA - 2 V 5.2mA