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 Prix 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
N° de stock RS 527-643
Référence fabricantSN74AHC1G86DBVR
0,179 €
Each (In a Pack of 25)
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XOR Surface Mount 1 2 No SOT-23 5 AHC - 5.5 V -8mA 8.8 ns @ 5 V, 14.5 ns @ 3.3 V 2 V 8mA
N° de stock RS 124-2313
Référence fabricantHEF4093BT,652
MarqueNexperia
0,292 €
Each (In a Tube of 57)
Unité
NAND Surface Mount 4 2 Yes SOIC 14 4000 Schmitt Trigger 15 V -4.2mA 60 ns @ 15 V, 80 ns @ 10 V, 185 ns @ 5 V 3 V 4.2mA
N° de stock RS 518-8650
Référence fabricantMC14011BDG
0,40 €
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NAND Surface Mount 4 2 No SOIC 14 4000 - 18 V -4.2mA 80 ns @ 15 V, 100 ns @ 10 V, 250 ns @ 5 V 3 V 4.2mA
N° de stock RS 145-0010
Référence fabricantCD4019BE
0,355 €
Each (In a Tube of 25)
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AND/OR Through Hole 4 2 No PDIP 16 4000 - 18 V -4.2mA 100 ns @ 15 V, 120 ns @ 10 V, 300 ns @ 5 V 3 V 4.2mA
N° de stock RS 145-1064
Référence fabricantCD74HCT86M
0,50 €
Each (In a Tube of 50)
Unité
XOR Surface Mount 4 2 No SOIC 14 HCT - 5.5 V -4mA 32 ns @ 4.5 V 4.5 V 4mA
N° de stock RS 178-7127
Référence fabricant74LVC1G02GW,125
MarqueNexperia
0,028 €
Each (On a Reel of 3000)
Unité
NOR Surface Mount 1 2 No TSSOP 5 LVC - 5.5 V -32mA - 1.65 V 32mA
N° de stock RS 103-8093
Référence fabricant74HC1G86GW,125
MarqueNexperia
0,043 €
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XOR Surface Mount 1 2 No TSSOP 5 HC CMOS 6 V -2.6mA 135ns 2 V 2.6mA
N° de stock RS 177-6786
Référence fabricant74HCT132D,652
MarqueNexperia
0,38 €
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NAND Surface Mount 4 2 Yes SOIC 14 HCT Schmitt Trigger 5.5 V -4mA 33 ns @ 4.5 V 4.5 V 4mA
N° de stock RS 124-2258
Référence fabricant74HC32D,652
MarqueNexperia
0,223 €
Each (In a Tube of 57)
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OR Surface Mount 4 2 - SOIC 14 HC - 6 V -5.2mA 15 ns @ 6 V, 18 ns @ 4.5 V, 90 ns @ 2 V 2 V 5.2mA
N° de stock RS 805-1520
Référence fabricantM74VHC1GT04DTT1G
0,033 €
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Inverter Surface Mount 1 - - TSOP 5 VHC LSSTL 5.5 V -8mA 17.5 ns@ 50 pF 3 V 8mA
N° de stock RS 145-0098
Référence fabricantSN74HC27N
0,296 €
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NOR Through Hole 3 3 No PDIP 14 HC - 6 V -5.2mA 15 ns @ 6 V, 18 ns @ 4.5 V, 90 ns @ 2 V 2 V 5.2mA
N° de stock RS 662-7377
Référence fabricantCD74HCT86M96
0,443 €
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XOR Surface Mount 4 2 No SOIC 14 HCT - 5.5 V -4mA 32 ns @ 4.5 V 4.5 V 4mA
N° de stock RS 166-0415
Référence fabricant74LVC1G32W5-7
MarqueDiodesZetex
0,022 €
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OR Surface Mount 1 2 No SOT-25 5 LVC - 5.5 V -32mA 5.5ns 1.65 V 32mA
N° de stock RS 333-3814
Référence fabricantCD74HCT08E
0,405 €
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AND Through Hole 4 2 No PDIP 14 HCT - 5.5 V -4mA 25 ns @ 4.5 V 4.5 V 4mA
N° de stock RS 442-971
Référence fabricantSN74HC27N
0,41 €
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NOR Through Hole 3 3 No PDIP 14 HC - 6 V -5.2mA 15 ns @ 6 V, 18 ns @ 4.5 V, 90 ns @ 2 V 2 V 5.2mA
N° de stock RS 709-2217
Référence fabricantSN74HC20NE4
0,264 €
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NAND Through Hole 2 4 No PDIP 14 HC - 6 V -5.2mA 19 ns @ 6 V, 22 ns @ 4.5 V, 110 ns @ 2 V 2 V 5.2mA
N° de stock RS 145-0385
Référence fabricantSN74LS03N
0,691 €
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NAND Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.1mA 32 ns @ 5 V 4.75 V 8mA
N° de stock RS 806-2144
Référence fabricantMC74AC08DG
0,306 €
Each (In a Pack of 55)
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AND Surface Mount 4 2 No SOIC 14 AC TTL 6 V -24mA 10 ns @ 50 pF 2 V 24mA
N° de stock RS 662-6982
Référence fabricantCD74HC08M96
0,274 €
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AND Surface Mount 4 2 No SOIC 14 HC - 6 V -5.2mA 15 ns @ 6 V, 18 ns @ 4.5 V, 90 ns @ 2 V 2 V 5.2mA
N° de stock RS 368-6720
Référence fabricantHEF4001BT,652
MarqueNexperia
0,259 €
Each (In a Tube of 57)
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NOR Surface Mount 4 2 No SOIC 14 4000 - 15 V -4.2mA 40 ns @ 15 V, 50 ns @ 10 V, 120 ns @ 5 V 3 V 4.2mA