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
kr 8,925
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. 217-5702
Mfr. Part No.SN74HCT00N
kr 9,78
Each
Units
NAND Through Hole 4 2 No PDIP 14 HCT - 5.5 V -4mA 18 ns @ 5.5 V, 20 ns @ 4.5 V 4.5 V 4mA
RS Stock No. 923-6801
Mfr. Part No.CD4011UBE
kr 8,771
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. 145-0402
Mfr. Part No.SN74HCT00N
kr 10,197
Each (In a Tube of 25)
Units
NAND Through Hole 4 2 No PDIP 14 HCT - 5.5 V -4mA 18 ns @ 5.5 V, 20 ns @ 4.5 V 4.5 V 4mA
RS Stock No. 162-8903
Mfr. Part No.M74VHC1GT08DTT1G
Brandonsemi
kr 1,163
Each (On a Reel of 3000)
Units
AND Surface Mount 1 2 No TSOP 5 VHC TTL 5.5 V -8mA 16.5 ns @ 50 pF 3 V 8mA
RS Stock No. 166-2414
Mfr. Part No.NC7SZ57P6X
Brandonsemi
kr 0,794
Each (On a Reel of 3000)
Units
Multifunction Surface Mount 2 2 Yes SC-70 6 TinyLogic UHS Schmitt Trigger 5.5 V -32mA 6.5ns 1.65 V 32mA
RS Stock No. 739-5188
Mfr. Part No.NC7SZ57P6X
Brandonsemi
kr 3,698
Each (In a Pack of 10)
Units
Multifunction Surface Mount 2 2 Yes SC-70 6 TinyLogic UHS Schmitt Trigger 5.5 V -32mA 6.5ns 1.65 V 32mA
RS Stock No. 791-8841
Mfr. Part No.HEF4070BT,652
BrandNexperia
kr 4,749
Each (In a Pack of 38)
Units
OR Surface Mount 4 2 No SOIC 14 4000 CMOS 15 V - 50 ns @ 15 V 5 V -
RS Stock No. 805-1539
Mfr. Part No.M74VHC1GT08DTT1G
Brandonsemi
kr 1,833
Each (On a Tape of 100)
Units
AND Surface Mount 1 2 No TSOP 5 VHC TTL 5.5 V -8mA 16.5 ns @ 50 pF 3 V 8mA
RS Stock No. 145-1087
Mfr. Part No.CD4070BM
kr 3,172
Each (In a Tube of 50)
Units
XOR Surface Mount 4 2 No SOIC 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. 162-6924
Mfr. Part No.CD4070BM96
kr 1,145
Each (On a Reel of 2500)
Units
XOR Surface Mount 4 2 No SOIC 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. 178-7004
Mfr. Part No.HEF4070BT,652
BrandNexperia
kr 4,846
Each (In a Tube of 57)
Units
OR Surface Mount 4 2 No SOIC 14 4000 CMOS 15 V - 50 ns @ 15 V 5 V -
RS Stock No. 806-2356
Mfr. Part No.MC74HC00ADR2G
Brandonsemi
kr 5,394
Each (In a Pack of 50)
Units
NAND Surface Mount 4 2 No SOIC 14 LS CMOS 6 V 5.2mA 110 ns @ 50 pF 2 V 5.2mA
RS Stock No. 179-2136
Mfr. Part No.CD4001BM
kr 6,514
Each (In a Tube of 50)
Units
NOR Surface Mount 4 2 No SOIC 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. 113-0528
Mfr. Part No.74HC125D,652
BrandNexperia
kr 5,33
Each
Units
Buffer, Line Driver Surface Mount - - No SOIC 14 HC Single Ended 6 V -7.8mA 100 ns @ 2 V 2 V 7.8mA
RS Stock No. 162-7446
Mfr. Part No.SN74LVC08ADBR
kr 1,901
Each (On a Reel of 2000)
Units
AND Surface Mount 4 2 No SSOP 14 LVC - 3.6 V -24mA 3.9 ns @ 3.3 V, 4.6 ns @ 2.7 V 1.65 V 24mA
RS Stock No. 709-2431
Mfr. Part No.CD4068BE
kr 4,995
Each (In a Pack of 10)
Units
AND/NAND Through Hole 1 8 No PDIP 14 4000 - 18 V -4.2mA 110 ns @ 15 V, 150 ns @ 10 V, 300 ns @ 5 V 3 V 4.2mA
RS Stock No. 739-0098
Mfr. Part No.NC7WZ16P6X
Brandonsemi
kr 3,719
Each (In a Pack of 10)
Units
- - - - - - - - - - - - - -
RS Stock No. 825-3211
Mfr. Part No.74AC11008PWR
kr 27,838
Each (In a Pack of 5)
Units
AND Surface Mount 4 2 No TSSOP 16 AC CMOS 5.5 V -24mA 6.9ns 3 V 24mA
RS Stock No. 923-2313
Mfr. Part No.SN7402N
kr 23,56
Each (In a Tube of 25)
Units
NOR Through Hole 4 2 No PDIP 14 74 - 5.25 V -0.4mA 22 ns @ 5 V 4.75 V 16mA