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.

The RS components range offers semiconductor logic gates from leading brands, with input/output configurations to suit the demands of your digital circuit.

Types of Logic Gate

Logic gates have distinct logic functions. The most common of these are known as basic gates. These include:

• AND Gates. This gate has multiple inputs that are processed to a single signal 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. Like 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.

There are also logic gates referred to as Exclusive Gates.

• XNOR (EX-NOR) Gate. These gates process a high signal if all input signals are true, e.g: if there are two one signals or two zero signals.

• XOR Gate. Unlike an XNOR, XOR performs exclusive dis-junction, which means it will only output a true signal if exactly one of the inputs are true.

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. Though their essential functions remain unchanged, their implementations are many.

• Encoders
• Decoders
• Multiplexers
• Demultiplexers
• Full adders
• 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. 145-4219
Mfr. Part No.MC74VHCT00ADR2G
$0.159
Each (On a Reel of 2500)
units
NAND Surface Mount 4 2 No SOIC 14 HCT TTL 5.5 V -8mA 17.5ns 3 V 8mA
RS Stock No. 805-6402
Mfr. Part No.MC74VHCT00ADR2G
$0.364
Each (On a Tape of 50)
units
NAND Surface Mount 4 2 No SOIC 14 HCT TTL 5.5 V -8mA 17.5ns 3 V 8mA
RS Stock No. 761-3482
Mfr. Part No.74AC08SCX
$0.306
Each (On a Tape of 25)
units
AND Surface Mount 4 2 No SOIC 14 AC - 6 V -24mA 10ns 2 V 24mA
RS Stock No. 166-2421
Mfr. Part No.74AC08SCX
$0.323
Each (On a Reel of 2500)
units
AND Surface Mount 4 2 No SOIC 14 AC - 6 V -24mA 10ns 2 V 24mA
RS Stock No. 791-6072
Mfr. Part No.MC14001BDR2G
$0.547
Each (On a Tape of 25)
units
NOR Surface Mount 4 2 No SOIC 14 4000 CMOS 18 V -4.2mA 350ns 0.5 V 4.2mA
RS Stock No. 178-7553
Mfr. Part No.74AC32SCX
$0.332
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
$0.555
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. 162-9388
Mfr. Part No.MC14001BDR2G
$0.228
Each (On a Reel of 2500)
units
NOR Surface Mount 4 2 No SOIC 14 4000 CMOS 18 V -4.2mA 350ns 0.5 V 4.2mA
RS Stock No. 518-8616
Mfr. Part No.MC14001BDG
$0.74
Each
units
NOR 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
RS Stock No. 178-4790
Mfr. Part No.MC14001BDG
$0.572
Each (In a Tube of 55)
units
NOR 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
RS Stock No. 806-3150
Mfr. Part No.MC14025BDG
$0.326
Each (In a Pack of 55)
units
NOR Surface Mount 3 3 No SOIC 14 4000 - 18 V -10mA 300ns 3 V 10mA
New
RS Stock No. 186-8477
Mfr. Part No.MC74HC14ADTR2G
$0.616
Each (In a Pack of 25)
units
Inverter Surface Mount 6 - Yes TSSOP 14 HC Schmitt Trigger 6 V 5.2mA 110 ns @ 50 pF 2 V 5.2mA
RS Stock No. 170-3419
Mfr. Part No.MC14093BDR2G
$0.261
Each (On a Reel of 2500)
units
NAND Surface Mount 4 2 Yes SOIC 14 4000 Schmitt Trigger 18 V -4.2mA 80 ns @ 15 V, 100 ns @ 10 V, 250 ns @ 5 V 3 V 4.2mA
RS Stock No. 145-3998
Mfr. Part No.MC74VHC86DTR2G
$0.179
Each (On a Reel of 2500)
units
XOR Surface Mount 4 2 No TSSOP 14 VHC CMOS 5.5 V -8mA 16.5ns 2 V 8mA
RS Stock No. 802-1159
Mfr. Part No.74ACT00MTC
$0.554
Each (In a Tube of 94)
units
NAND Surface Mount 4 2 No TSSOP 14 ACT TTL 5.5 V -24mA 9.5 ns @ 50 pF 4.5 V 24mA
RS Stock No. 908-0856
Mfr. Part No.MC10EP05DG
$10.69
Each (In a Pack of 2)
units
AND/NAND Surface Mount 1 2 No SOIC 8 ECL ECL 5.5 V - 320ps 3 V -
New
RS Stock No. 186-7304
Mfr. Part No.MC74VHC04DTR2G
$0.191
Each (On a Reel of 2500)
units
Inverter Surface Mount 6 - - TSSOP 14 VHC CMOS 5.5 V -24mA 12 ns @ 50 pF 2 V 24mA
RS Stock No. 145-3654
Mfr. Part No.MC74VHC1G86DTT1G
$0.073
Each (On a Reel of 3000)
units
XOR Surface Mount 1 2 No TSOP 5 VHC CMOS 5.5 V -8mA 19.5ns 2 V 8mA
RS Stock No. 806-1491
Mfr. Part No.MC74HC1G32DTT1G
$0.149
Each (On a Tape of 100)
units
OR Surface Mount 1 2 No TSOP 5 HC CMOS 6 V -2.6mA 155ns 2 V 2.6mA
New
RS Stock No. 184-4272
Mfr. Part No.MC74HC02ADG
$0.265
Each (In a Tube of 55)
units
NOR Surface Mount 4 2 - SOIC 14 74HC CMOS 6 V 5.2mA 110 ns @ 50 pF 2 V 5.2mA