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. 510-201
Mfr. Part No.74LVC1G08GW,125
BrandNexperia
HK$1.282
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. 146-0843
Mfr. Part No.74HCT1G32GW,125
BrandNexperia
HK$0.423
Each (On a Reel of 3000)
units
OR Surface Mount 1 2 No TSSOP 5 HCT TTL 5.5 V -2mA 27ns 4.5 V 2mA
RS Stock No. 775-7784
Mfr. Part No.74HCT1G32GW,125
BrandNexperia
HK$2.079
Each (In a Bag of 30)
units
OR Surface Mount 1 2 No TSSOP 5 HCT TTL 5.5 V -2mA 27ns 4.5 V 2mA
RS Stock No. 178-7128
Mfr. Part No.74LVC1G08GW,125
BrandNexperia
HK$0.315
Each (On a Reel of 3000)
units
AND Surface Mount 1 2 No TSSOP 5 LVC - 5.5 V -32mA - 1.65 V 32mA
RS Stock No. 124-2273
Mfr. Part No.74LVC2G32DP,125
BrandNexperia
HK$1.587
Each (On a Reel of 3000)
units
OR Surface Mount 2 2 - TSSOP 8 LVC TTL 5.5 V -32mA 6 ns @ 50 pF 1.65 V 32mA
RS Stock No. 816-8839
Mfr. Part No.74LVC2G32DP,125
BrandNexperia
HK$3.423
Each (In a Pack of 30)
units
OR Surface Mount 2 2 No TSSOP 8 LVC TTL 5.5 V -32mA 6 ns @ 50 pF 1.65 V 32mA
RS Stock No. 166-1437
Mfr. Part No.74AHC1G08GW,125
BrandNexperia
HK$0.274
Each (On a Reel of 3000)
units
AND Surface Mount 1 2 No TSSOP 5 AHC - 5.5 V -8mA 7.9 ns @ 4.5 V to 5.5 V, 12.3 ns @ 3 V to 3.6 V 2 V 8mA
RS Stock No. 510-087
Mfr. Part No.74AHC1G08GW,125
BrandNexperia
HK$1.313
Each (In a Pack of 50)
units
AND Surface Mount 1 2 No TSSOP 5 AHC - 5.5 V -8mA 7.9 ns @ 4.5 V → 5.5 V, 12.3 ns @ 3 V → 3.6 V 2 V 8mA
RS Stock No. 510-403
Mfr. Part No.74LVC1G32GW,125
BrandNexperia
HK$1.313
Each (In a Pack of 50)
units
OR Surface Mount 1 2 No TSSOP 5 LVC - 5.5 V -32mA - 1.65 V 32mA
RS Stock No. 166-1444
Mfr. Part No.74LVC1G32GW,125
BrandNexperia
HK$0.282
Each (On a Reel of 3000)
units
OR Surface Mount 1 2 No TSSOP 5 LVC - 5.5 V -32mA - 1.65 V 32mA
RS Stock No. 170-7993
Mfr. Part No.HEF4011BT,653
BrandNexperia
HK$0.948
Each (On a Reel of 2500)
units
NAND Surface Mount 4 2 - SO 14 HEF CMOS 15 V -4.2mA 110 ns @ 50 pF 3 V 4.2mA
RS Stock No. 166-1278
Mfr. Part No.74LVC132AD,112
BrandNexperia
HK$4.336
Each (In a Tube of 57)
units
NAND Surface Mount 4 2 Yes SOIC 14 LVC Schmitt Trigger 3.6 V -24mA - 1.2 V 24mA
RS Stock No. 787-369
Mfr. Part No.HEF4011BT,652
BrandNexperia
HK$3.454
Each (In a Pack of 5)
units
NAND Surface Mount 4 2 No SOIC 14 4000 - 15 V -3.6mA 35 ns @ 15 V, 45 ns @ 10 V, 110 ns @ 5 V 3 V 3.6mA
RS Stock No. 165-8730
Mfr. Part No.74LVC2G32DC,125
BrandNexperia
HK$1.622
Each (On a Reel of 3000)
units
OR Surface Mount 2 2 No VSSOP 8 LVC TTL 5.5 V -32mA 6 ns @ 50 pF 1.65 V 32mA
RS Stock No. 124-2258
Mfr. Part No.74HC32D,652
BrandNexperia
HK$2.318
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. 113-0130
Mfr. Part No.74HC32D,652
BrandNexperia
HK$3.14
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. 510-184
Mfr. Part No.74LVC132AD,112
BrandNexperia
HK$4.254
Each (In a Pack of 20)
units
NAND Surface Mount 4 2 Yes SOIC 14 LVC Schmitt Trigger 3.6 V -24mA - 1.2 V 24mA
RS Stock No. 103-8153
Mfr. Part No.HEF4011BT,652
BrandNexperia
HK$2.523
Each (In a Tube of 57)
units
NAND Surface Mount 4 2 No SOIC 14 4000 - 15 V -3.6mA 35 ns @ 15 V, 45 ns @ 10 V, 110 ns @ 5 V 3 V 3.6mA
RS Stock No. 165-8729
Mfr. Part No.74LVC2G08DC,125
BrandNexperia
HK$2.061
Each (On a Reel of 3000)
units
AND Surface Mount 2 2 No VSSOP 8 LVC TTL 5.5 V -32mA 6.7 ns @ 50 pF 1.65 V 32mA
RS Stock No. 816-8808
Mfr. Part No.74LVC2G08DC,125
BrandNexperia
HK$2.856
Each (In a Pack of 10)
units
AND Surface Mount 2 2 No VSSOP 8 LVC TTL 5.5 V -32mA 6.7 ns @ 50 pF 1.65 V 32mA