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. 756-2814
Mfr. Part No.TC4001BF(EL,N,F)
BrandToshiba
SGD0.932
Each (In a Pack of 5)
units
NOR Surface Mount 4 2 No SOP 14 4000 CMOS 18 V dc -4mA 200ns 3 V dc +4mA
RS Stock No. 539-9377
Mfr. Part No.TC74HC32AP(F)
BrandToshiba
SGD0.484
Each (In a Pack of 5)
units
OR Through Hole 4 2 No PDIP 14 HC - 6 V -5.2mA 13 ns @ 6 V, 15 ns @ 4.5 V, 75 ns @ 2 V 2 V 5.2mA
RS Stock No. 541-9673
Mfr. Part No.TC4081BP(F)
BrandToshiba
SGD0.594
Each (In a Pack of 5)
units
AND Through Hole 4 2 No PDIP 14 4000 - 18 V -4mA 80 ns @ 15 V, 100 ns @ 10 V, 200 ns @ 5 V 3 V 4mA
RS Stock No. 541-9544
Mfr. Part No.TC4011BP(F)
BrandToshiba
SGD0.972
Each (In a Pack of 5)
units
NAND Through Hole 4 2 No PDIP 14 4000 - 18 V -4mA 80 ns @ 15 V, 100 ns @ 10 V, 200 ns @ 5 V 3 V 4mA
RS Stock No. 541-9724
Mfr. Part No.TC74AC02F(F)
BrandToshiba
SGD0.772
Each (In a Pack of 5)
units
NOR Surface Mount 4 2 No SOP 14 AC - 5.5 V -24mA 7 ns @ 5 V, 9.8 ns @ 3.3 V 2 V 24mA
RS Stock No. 601-4077
Mfr. Part No.TC4081BF(F)
BrandToshiba
SGD0.63
Each (In a Pack of 5)
units
AND Surface Mount 4 2 No SOP 14 4000 - 18 V -4mA 80 ns @ 15 V, 100 ns @ 10 V, 200 ns @ 5 V 3 V 4mA
RS Stock No. 896-6731
Mfr. Part No.TC7SH00F,LJ(CT
BrandToshiba
SGD0.359
Each (In a Pack of 50)
units
NAND Surface Mount 1 2 No SSOP 5 VHC CMOS 5.5 V -8mA 13 ns @ 50 pF 2 V 8mA
RS Stock No. 639-6082
Mfr. Part No.TC4S71F(TE85L,F)
BrandToshiba
SGD0.302
Each (In a Pack of 10)
units
OR Surface Mount 1 2 No SSOP 5 4000 - 18 V -4mA 80 ns @ 15 V, 100 ns @ 10 V, 200 ns @ 5 V 3 V 4mA
RS Stock No. 539-9210
Mfr. Part No.TC74HC02AP(F)
BrandToshiba
SGD0.69
Each (In a Pack of 5)
units
NOR Through Hole 4 2 No PDIP 14 HC - 6 V -5.2mA 13 ns @ 6 V, 15 ns @ 4.5 V, 75 ns @ 2 V 2 V 5.2mA
RS Stock No. 540-0590
Mfr. Part No.TC7S08FU(F)
BrandToshiba
SGD0.386
Each (In a Pack of 5)
units
AND Surface Mount 1 2 No SSOP 5 HC - 6 V -2.6mA 17 ns @ 6 V, 20 ns @ 4.5 V, 100 ns @ 2 V 2 V 2.6mA
RS Stock No. 601-3951
Mfr. Part No.TC4011BF(F)
BrandToshiba
SGD0.582
Each (In a Pack of 5)
units
NAND Surface Mount 4 2 No SOP 14 4000 - 18 V -4mA 80 ns @ 15 V, 100 ns @ 10 V, 200 ns @ 5 V 3 V 4mA
RS Stock No. 539-9282
Mfr. Part No.TC74HC08AP(F)
BrandToshiba
SGD0.684
Each (In a Pack of 5)
units
AND Through Hole 4 2 No PDIP 14 HC - 6 V -5.2mA 13 ns @ 6 V, 15 ns @ 4.5 V, 75 ns @ 2 V 2 V 5.2mA
RS Stock No. 540-7939
Mfr. Part No.TC74HC20AF(F)
BrandToshiba
SGD0.476
Each (In a Pack of 5)
units
NAND Surface Mount 2 4 No SOP 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. 539-9349
Mfr. Part No.TC74HC21AP(F)
BrandToshiba
SGD0.532
Each (In a Pack of 5)
units
AND Through Hole 2 4 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. 756-3280
Mfr. Part No.TC7SH08FU(BRA,JF)
BrandToshiba
SGD0.435
Each (In a Pack of 10)
units
AND Surface Mount 1 2 No SSOP 5 VHS CMOS 5.5 V +25mA 14ns 2 V -25mA
RS Stock No. 896-6740
Mfr. Part No.TC7SH00FU,LJ(CT
BrandToshiba
SGD0.14
Each (In a Pack of 100)
units
NAND Surface Mount 1 2 No SSOP 5 VHC CMOS 5.5 V -8mA 13 ns @ 50 pF 2 V 8mA
RS Stock No. 171-3441
Mfr. Part No.74VHC21FT
BrandToshiba
SGD0.425
Each (In a Pack of 50)
units
AND Surface Mount 2 4 - TSSOP 14 74VHC CMOS, TTL 5.5 V -8mA 13.5 ns @ 50 pF 2 V 8mA
RS Stock No. 539-9490
Mfr. Part No.TC74HC132AP(F)
BrandToshiba
SGD0.97
Each (In a Pack of 5)
units
NAND Through Hole 4 2 Yes PDIP 14 HC Schmitt Trigger 6 V -5.2mA 19 ns @ 6 V, 22 ns @ 4.5 V, 110 ns @ 2 V 2 V 5.2mA
RS Stock No. 171-3400
Mfr. Part No.74VHC32FT
BrandToshiba
SGD0.456
Each (In a Pack of 50)
units
OR Surface Mount 4 2 - TSSOP 14 74VHC CMOS, TTL 5.5 V -8mA 14.5 ns @ 50 pF 2 V 8mA
RS Stock No. 171-3163
Mfr. Part No.TC7WZ86FU
BrandToshiba
SGD0.367
Each (In a Pack of 50)
units
XOR Surface Mount 2 2 - SOT-505 8 - CMOS 5.5 V -32mA 12 ns @ 15 pF 1.65 V 32mA