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. 168-9606
Mfr. Part No.HEF4071BT,652
BrandNexperia
MYR1.292
Each (In a Tube of 57)
units
OR Surface Mount 4 2 No SOIC 14 4000 - 15 V -3.6mA 35 ns @ 15 V, 50 ns @ 10 V, 115 ns @ 5 V 3 V 3.6mA
RS Stock No. 355-9000
Mfr. Part No.HEF4071BT,652
BrandNexperia
MYR1.75
Each
units
OR Surface Mount 4 2 No SOIC 14 4000 - 15 V -3.6mA 35 ns @ 15 V, 50 ns @ 10 V, 115 ns @ 5 V 3 V 3.6mA
RS Stock No. 113-0130
Mfr. Part No.74HC32D,652
BrandNexperia
MYR1.32
Each
units
OR 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
RS Stock No. 124-2258
Mfr. Part No.74HC32D,652
BrandNexperia
MYR1.155
Each (In a Tube of 57)
units
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
RS Stock No. 113-0095
Mfr. Part No.74HC02D,652
BrandNexperia
MYR1.62
Each
units
NOR Surface Mount 4 2 No SOIC 14 HC CMOS 6 V -5.2mA 15 ns @ 6 V, 18 ns @ 4.5 V, 90 ns @ 2 V 2 V 5.2mA
RS Stock No. 103-8093
Mfr. Part No.74HC1G86GW,125
BrandNexperia
MYR0.209
Each (On a Reel of 3000)
units
XOR Surface Mount 1 2 No TSSOP 5 HC CMOS 6 V -2.6mA 135ns 2 V 2.6mA
RS Stock No. 775-7762
Mfr. Part No.74HC1G86GW,125
BrandNexperia
MYR0.941
Each (On a Tape of 30)
units
XOR Surface Mount 1 2 No TSSOP 5 HC CMOS 6 V -2.6mA 135ns 2 V 2.6mA
RS Stock No. 816-8817
Mfr. Part No.74LVC2G08DP,125
BrandNexperia
MYR1.61
Each (In a Pack of 30)
units
AND Surface Mount 2 2 No TSSOP 8 LVC TTL 5.5 V -32mA 6.7 ns @ 50 pF 1.65 V 32mA
RS Stock No. 112-6276
Mfr. Part No.74HC86D,652
BrandNexperia
MYR1.58
Each
units
XOR Surface Mount 4 2 No SOIC 14 HC - 6 V -5.2mA 20 ns @ 6 V, 24 ns @ 4.5 V, 120 ns @ 2 V 2 V 5.2mA
RS Stock No. 483-7941
Mfr. Part No.HEF4077BT,652
BrandNexperia
MYR1.459
Each (In a Pack of 20)
units
XNOR Surface Mount 4 2 No SOIC 14 4000 - 15 V -3.6mA 55 ns @ 15 V, 70 ns @ 10 V, 150 ns @ 5 V 3 V 3.6mA
RS Stock No. 103-8395
Mfr. Part No.HEF4001BT,652
BrandNexperia
MYR1.318
Each (In a Tube of 57)
units
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
RS Stock No. 775-7750
Mfr. Part No.74HC1G32GW,125
BrandNexperia
MYR0.42
Each (On a Tape of 100)
units
OR Surface Mount 1 2 No TSSOP 5 HC CMOS 6 V -2.6mA 135ns 2 V 2.6mA
RS Stock No. 165-8527
Mfr. Part No.74LVC1G08GV,125
BrandNexperia
MYR0.161
Each (On a Reel of 3000)
units
AND Surface Mount 1 2 No SC-74A 5 LVC CMOS 5.5 V -32mA 7 ns @ 50 pF 1.65 V 32mA
RS Stock No. 146-0487
Mfr. Part No.74HC1G32GW,125
BrandNexperia
MYR0.188
Each (On a Reel of 3000)
units
OR Surface Mount 1 2 No TSSOP 5 HC CMOS 6 V -2.6mA 135ns 2 V 2.6mA
RS Stock No. 178-7002
Mfr. Part No.HEF4077BT,652
BrandNexperia
MYR1.686
Each (In a Tube of 57)
units
XNOR Surface Mount 4 2 No SOIC 14 4000 - 15 V -3.6mA 55 ns @ 15 V, 70 ns @ 10 V, 150 ns @ 5 V 3 V 3.6mA
RS Stock No. 816-8750
Mfr. Part No.74LVC1G08GV,125
BrandNexperia
MYR0.368
Each (In a Pack of 100)
units
AND Surface Mount 1 2 No SC-74A 5 LVC CMOS 5.5 V -32mA 7 ns @ 50 pF 1.65 V 32mA
RS Stock No. 165-8631
Mfr. Part No.74LVC2G08DP,125
BrandNexperia
MYR0.706
Each (On a Reel of 3000)
units
AND Surface Mount 2 2 No TSSOP 8 LVC TTL 5.5 V -32mA 6.7 ns @ 50 pF 1.65 V 32mA
RS Stock No. 510-194
Mfr. Part No.74LVC132APW,118
BrandNexperia
MYR1.846
Each (In a Pack of 20)
units
NAND Surface Mount 4 2 Yes TSSOP 14 LVC Schmitt Trigger 3.6 V -24mA - 1.2 V 24mA
RS Stock No. 510-201
Mfr. Part No.74LVC1G08GW,125
BrandNexperia
MYR0.622
Each (In a Pack of 50)
units
AND Surface Mount 1 2 No TSSOP 5 LVC - 5.5 V -32mA - 1.65 V 32mA
RS Stock No. 170-8012
Mfr. Part No.74LVC00APW,118
BrandNexperia
MYR0.36
Each (On a Reel of 2500)
units
NAND Surface Mount 4 2 Yes TSSOP 14 74LVC Schmitt Trigger 3.6 V -24mA 9.7 ns @ 50 pF 1.2 V 24mA