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. 923-2335
Mfr. Part No.SN74LS08N
€0.465
Each (In a Tube of 25)
units
AND Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.4mA 20 ns @ 5 V 4.75 V 8mA
RS Stock No. 170-7968
Mfr. Part No.74HC08D,653
BrandNexperia
€0.059
Each (On a Reel of 2500)
units
AND Surface Mount 4 2 - SO 14 74HC CMOS 6 V -5.2mA 135 ns @ 50 pF 2 V 5.2mA
RS Stock No. 103-8167
Mfr. Part No.74HC08D,652
BrandNexperia
€0.229
Each (In a Tube of 57)
units
AND 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. 333-3814
Mfr. Part No.CD74HCT08E
€0.398
Each (In a Tube of 25)
units
AND Through Hole 4 2 No PDIP 14 HCT - 5.5 V -4mA 25 ns @ 4.5 V 4.5 V 4mA
RS Stock No. 178-7553
Mfr. Part No.74AC32SCX
€0.183
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
€0.394
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. 923-2341
Mfr. Part No.SN74LS32N
€0.433
Each (In a Tube of 25)
units
OR Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.4mA 22 ns @ 5 V 4.75 V 8mA
RS Stock No. 305-232
Mfr. Part No.SN74LS09N
€0.79
Each
units
AND Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.1mA 35 ns @ 5 V 4.75 V 8mA
RS Stock No. 145-0382
Mfr. Part No.SN74LS09N
€0.677
Each (In a Tube of 25)
units
AND Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.1mA 35 ns @ 5 V 4.75 V 8mA
RS Stock No. 527-079
Mfr. Part No.CD4071BE
€0.362
Each (In a Tube of 25)
units
OR Through Hole 4 2 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. 122-1486
Mfr. Part No.74LVC1G04Z-7
€0.067
Each (On a Reel of 4000)
units
Inverter Surface Mount - - No SOT-553 5 LVC CMOS 5.5 V -32mA 7 ns @ 2.7 V 1.65 V 32mA
RS Stock No. 770-5327
Mfr. Part No.74LVC1G04Z-7
€0.097
Each (In a Pack of 50)
units
NOT Surface Mount 1 - - SOT-553 5 LVC CMOS 5.5 V -32mA 7 ns @ 2.7 V 1.65 V 32mA
RS Stock No. 805-1520
Mfr. Part No.M74VHC1GT04DTT1G
€0.022
Each (On a Tape of 100)
units
Inverter Surface Mount 1 - - TSOP 5 VHC LSSTL 5.5 V -8mA 17.5 ns@ 50 pF 3 V 8mA
RS Stock No. 168-4861
Mfr. Part No.SN74HC00DR
€0.069
Each (On a Reel of 2500)
units
NAND 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. 923-2357
Mfr. Part No.SN74LS86AN
€0.433
Each (In a Tube of 25)
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. 510-184
Mfr. Part No.74LVC132AD,112
BrandNexperia
€0.46
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. 166-1278
Mfr. Part No.74LVC132AD,112
BrandNexperia
€0.398
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. 709-2968
Mfr. Part No.CD4011UBE
€0.353
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. 307-604
Mfr. Part No.SN74LS86AN
€2.26
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. 146-0513
Mfr. Part No.74AHC1G08GV,125
BrandNexperia
€0.029
Each (On a Reel of 3000)
units
AND Surface Mount 1 2 No SC-74A 5 AHC CMOS 5.5 V -8mA 16 ns @ 50 pF 2 V 8mA
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