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. 923-6801
Mfr. Part No.CD4011UBE
$0.748
Each (In a Tube of 25)
units
NAND Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 120 ns @ 5 V, 50 ns @ 15 V, 60 ns @ 10 V 3 V 4.2mA
RS Stock No. 709-2968
Mfr. Part No.CD4011UBE
$0.746
Each (In a Pack of 10)
units
NAND Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 120 ns @ 5 V, 50 ns @ 15 V, 60 ns @ 10 V 3 V 4.2mA
RS Stock No. 709-2371
Mfr. Part No.CD4082BE
$0.75
Each (In a Pack of 20)
units
AND Through Hole 2 4 No PDIP 14 4000 - 18 V -4.2mA 120 ns @ 10 V, 250 ns @ 5 V, 90 ns @ 15 V 3 V 4.2mA
RS Stock No. 145-0008
Mfr. Part No.CD4082BE
$0.717
Each (In a Tube of 25)
units
AND Through Hole 2 4 No PDIP 14 4000 - 18 V -4.2mA 120 ns @ 10 V, 250 ns @ 5 V, 90 ns @ 15 V 3 V 4.2mA
RS Stock No. 527-132
Mfr. Part No.CD4002BE
$0.717
Each (In a Tube of 25)
units
NOR Through Hole 2 4 No PDIP 14 4000 - 18 V -4.2mA 120 ns @ 10 V, 250 ns @ 5 V, 90 ns @ 15 V 3 V 4.2mA
RS Stock No. 170-7964
Mfr. Part No.HEF4093BT,653
BrandNexperia
$0.177
Each (On a Reel of 2500)
units
NAND Surface Mount 4 2 Yes SO 14 HEF Schmitt Trigger 15 V -4.2mA 185 ns @ 50 pF 3 V 4.2mA
RS Stock No. 145-0039
Mfr. Part No.CD4072BE
$0.295
Each (In a Tube of 25)
units
OR Through Hole 2 4 No PDIP 14 4000 CMOS 18 V -4.2mA 250 ns @ 50 pF 3 V 4.2mA
RS Stock No. 124-2313
Mfr. Part No.HEF4093BT,652
BrandNexperia
$0.684
Each (In a Tube of 57)
units
NAND Surface Mount 4 2 Yes SOIC 14 4000 Schmitt Trigger 15 V -4.2mA 185 ns @ 5 V, 60 ns @ 15 V, 80 ns @ 10 V 3 V 4.2mA
RS Stock No. 355-9167
Mfr. Part No.HEF4093BT,652
BrandNexperia
$0.88
Each
units
NAND Surface Mount 4 2 Yes SOIC 14 4000 Schmitt Trigger 15 V -4.2mA 185 ns @ 5 V, 60 ns @ 15 V, 80 ns @ 10 V 3 V 4.2mA
RS Stock No. 307-496
Mfr. Part No.SN74LS02N
$0.89
Each
units
NOR Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.4mA 15 ns @ 5 V 4.75 V 8mA
RS Stock No. 307-604
Mfr. Part No.SN74LS86AN
$3.82
Each
units
XOR Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.4mA 30 ns @ 5 V 4.75 V 8mA
RS Stock No. 145-4219
Mfr. Part No.MC74VHCT00ADR2G
$0.19
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
$0.567
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. 796-7941
Mfr. Part No.CD4072BE
$0.717
Each (In a Pack of 25)
units
OR Through Hole 2 4 No PDIP 14 4000 CMOS 18 V -4.2mA 250 ns @ 50 pF 3 V 4.2mA
RS Stock No. 368-5884
Mfr. Part No.SN74LS00N
$0.928
Each (In a Tube of 25)
units
NAND Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.4mA 15 ns @ 5 V 4.75 V 8mA
RS Stock No. 179-2141
Mfr. Part No.CD74AC32M
$1.224
Each (In a Tube of 50)
units
OR Surface Mount 4 2 No SOIC 14 AC - 5.5 V -24mA 119 ns @ 1.5 V, 13.3 ns @ 3.3 V, 9.5 ns @ 5 V 1.5 V 24mA
RS Stock No. 166-2421
Mfr. Part No.74AC08SCX
$0.359
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. 527-441
Mfr. Part No.CD4030BE
$0.717
Each (In a Tube of 25)
units
XOR Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 100 ns @ 15 V, 130 ns @ 10 V, 280 ns @ 5 V 3 V 4.2mA
RS Stock No. 796-8183
Mfr. Part No.SN74AC32D
$0.826
Each (In a Pack of 10)
units
OR Surface Mount 4 2 No SOIC 14 AC CMOS 6 V -24mA 8.5 ns @ 5 V 2 V 24mA
RS Stock No. 761-3482
Mfr. Part No.74AC08SCX
$0.939
Each (On a Tape of 25)
units
AND Surface Mount 4 2 No SOIC 14 AC - 6 V -24mA 10ns 2 V 24mA