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. 178-7553
Mfr. Part No.74AC32SCX
€0.185
Each (On a Reel of 2500)
units
OR Surface Mount 4 2 No SOIC 14 AC - 6 V -24mA 10ns 2 V 24mA
RS Stock No. 761-3486
Mfr. Part No.74AC32SCX
€0.397
Each (In a Pack of 25)
units
OR Surface Mount 4 2 No SOIC 14 AC - 6 V -24mA 10ns 2 V 24mA
RS Stock No. 806-4009
Mfr. Part No.MC74VHC1G32DFT2G
€0.069
Each (In a Pack of 100)
units
OR Surface Mount 1 2 No SC-88A 5 VHC CMOS 5.5 V -8mA 15.5 ns @ 50 pF 2 V 8mA
RS Stock No. 145-3978
Mfr. Part No.M74VHC1GT04DTT1G
€0.029
Each (On a Reel of 3000)
units
Inverter Surface Mount 1 - - TSOP 5 VHC LSSTL 5.5 V -8mA 17.5 ns @ 50 pF 3 V 8mA
RS Stock No. 805-1520
Mfr. Part No.M74VHC1GT04DTT1G
€0.033
Each (On a Tape of 100)
units
Inverter Surface Mount 1 - - TSOP 5 VHC LSSTL 5.5 V -8mA 17.5 ns@ 50 pF 3 V 8mA
RS Stock No. 145-3463
Mfr. Part No.MC74VHC1G32DFT2G
€0.032
Each (On a Reel of 3000)
units
OR Surface Mount 1 2 No SC-88A 5 VHC CMOS 5.5 V -8mA 15.5 ns @ 50 pF 2 V 8mA
RS Stock No. 166-1615
Mfr. Part No.MM74HCT00MX
€0.176
Each (On a Reel of 2500)
units
NAND Surface Mount 4 2 No SOIC 14 HCT - 5.5 V -4.8mA 23 ns @ 5 V 4.5 V 4.8mA
RS Stock No. 805-1545
Mfr. Part No.M74VHC1GT14DFT1G
€0.07
Each (On a Tape of 100)
units
Inverter Surface Mount 1 - - SC-70 5 VHC LS-TTL 5.5 V -8mA 20.5 ns@ 50 pF 3 V 8mA
RS Stock No. 145-5226
Mfr. Part No.M74VHC1GT14DFT1G
€0.037
Each (On a Reel of 3000)
units
Inverter Surface Mount 1 - - SC-70 5 VHC LS-TTL 5.5 V -8mA 20.5 ns @ 50 pF 3 V 8mA
RS Stock No. 761-4334
Mfr. Part No.74LCX08MX
€0.425
Each (On a Tape of 10)
units
AND Surface Mount 4 2 No SOIC 14 LCX CMOS 3.6 V -24mA 6.2ns 2 V 24mA
RS Stock No. 178-4794
Mfr. Part No.MC14081BDG
€0.322
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. 518-9164A
Mfr. Part No.MC14081BDG
€0.381
Each (In a Pack 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. 671-1579
Mfr. Part No.74LCX08M
€0.60
Each (In a Pack of 5)
units
AND Surface Mount 4 2 No SOIC 14 LCX - 3.6 V -24mA 5.5 ns @ 3.3 V, 6.2 ns @ 2.7 V 2 V 24mA
RS Stock No. 671-1810
Mfr. Part No.MM74HCT00MX
€0.436
Each (In a Pack of 10)
units
NAND Surface Mount 4 2 No SOIC 14 HCT - 5.5 V -4.8mA 23 ns @ 5 V 4.5 V 4.8mA
RS Stock No. 518-9164
Mfr. Part No.MC14081BDG
€0.43
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. 166-2402
Mfr. Part No.74LCX08MX
€0.193
Each (On a Reel of 2500)
units
AND Surface Mount 4 2 No SOIC 14 LCX - 3.6 V -24mA 5.5 ns @ 3.3 V, 6.2 ns @ 2.7 V 2 V 24mA
RS Stock No. 170-3418
Mfr. Part No.MC14081BDR2G
€0.072
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. 688-1521
Mfr. Part No.MC14081BDR2G
€0.066
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. 806-3876
Mfr. Part No.MC74VHC00DR2G
€0.286
Each (In a Pack of 50)
units
NAND Surface Mount 4 2 No SOIC 14 VHC CMOS 5.5 V -8mA 14.5 ns @ 50 pF 2 V 8mA
RS Stock No. 805-1548
Mfr. Part No.M74VHC1GT14DFT2G
€0.058
Each (On a Tape of 100)
units
Inverter Surface Mount 1 - - SC-70 5 VHC LS-TTL 5.5 V -8mA 20.5 ns@ 50 pF 3 V 8mA