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. 759-6696
Mfr. Part No.74AC86SC
PHP24.848
Each (In a Pack of 55)
units
XOR Surface Mount 4 2 No SOIC 14 AC - 6 V -75mA 12.5ns 2 V 75mA
RS Stock No. 808-4056
Mfr. Part No.MC100EP08DTG
PHP375.96
Each (In a Pack of 2)
units
XOR/XNOR Surface Mount 2 2 No TSSOP 8 ECL - 5.5 V - 320ps 3 V -
RS Stock No. 145-2953
Mfr. Part No.MC74HC132ADTG
PHP5.101
Each (In a Tube of 96)
units
NAND Surface Mount 4 2 Yes TSSOP 14 HC Schmitt Trigger 6 V 5.2mA 190ns 2 V 5.2mA
RS Stock No. 163-0475
Mfr. Part No.MC100EP08DTG
PHP280.998
Each (In a Tube of 100)
units
XOR/XNOR Surface Mount 2 2 No TSSOP 8 ECL - 5.5 V - 320ps 3 V -
RS Stock No. 806-1369
Mfr. Part No.MC74HC03ADG
PHP15.23
Each (In a Pack of 55)
units
NAND Surface Mount 1 2 No SOIC 14 HC CMOS 6 V - 180ns 2 V 5.2mA
RS Stock No. 688-1530
Mfr. Part No.MC14093BDR2G
PHP19.94
Each (In a Pack of 5)
units
NAND Surface Mount 4 2 Yes SOIC 14 4000 Schmitt Trigger 18 V -4.2mA 100 ns @ 10 V, 250 ns @ 5 V, 80 ns @ 15 V 3 V 4.2mA
RS Stock No. 163-2474
Mfr. Part No.MC74HC08ADG
PHP4.945
Each (In a Tube of 55)
units
AND Surface Mount 4 2 No SOIC 14 HC - 6 V -5.2mA 13 ns @ 6 V, 15 ns @ 4.5 V, 30 ns @ 3 V, 75 ns @ 2 V 2 V 5.2mA
RS Stock No. 170-3419
Mfr. Part No.MC14093BDR2G
PHP7.713
Each (On a Reel of 2500)
units
NAND Surface Mount 4 2 Yes SOIC 14 4000 Schmitt Trigger 18 V -4.2mA 100 ns @ 10 V, 250 ns @ 5 V, 80 ns @ 15 V 3 V 4.2mA
RS Stock No. 806-3239
Mfr. Part No.MC14082BDR2G
PHP7.773
Each (On a Tape of 50)
units
AND Surface Mount 2 2 No SOIC 14 4000 - 18 V -10mA 300 ns @ 50 pF 3 V 10mA
RS Stock No. 806-1378
Mfr. Part No.MC74HC03ADR2G
PHP8.734
Each (On a Tape of 50)
units
NAND Surface Mount 1 2 No SOIC 14 HC CMOS 6 V - 180ns 2 V 5.2mA
RS Stock No. 805-1548
Mfr. Part No.M74VHC1GT14DFT2G
PHP1.83
Each (On a Tape of 100)
units
Inverter Surface Mount 1 - - SC-70 5 VHC LS-TTL 5.5 V -8mA 20.5 ns@ 50 pF 3 V 8mA
RS Stock No. 805-1586
Mfr. Part No.M74VHC1GU04DFT2G
PHP2.413
Each (In a Pack of 100)
units
Inverter Surface Mount 1 - - SC-70 5 VHC Single Ended 5.5 V -8mA 15.5 ns@ 50 pF 2 V 8mA
RS Stock No. 689-8705
Mfr. Part No.MC74HC08ADG
PHP18.458
Each (In a Pack of 5)
units
AND Surface Mount 4 2 No SOIC 14 HC - 6 V -5.2mA 13 ns @ 6 V, 15 ns @ 4.5 V, 30 ns @ 3 V, 75 ns @ 2 V 2 V 5.2mA
RS Stock No. 166-2762
Mfr. Part No.MM74HC132MX
PHP9.083
Each (On a Reel of 2500)
units
NAND Surface Mount 4 2 No SOIC 14 HC CMOS 6 V 5.2mA 158ns 2 V 5.2mA
RS Stock No. 163-0535
Mfr. Part No.MC14082BDR2G
PHP6.93
Each (On a Reel of 2500)
units
AND Surface Mount 2 2 No SOIC 14 4000 - 18 V -10mA 300 ns @ 50 pF 3 V 10mA
RS Stock No. 145-4237
Mfr. Part No.MC74HC03ADR2G
PHP3.911
Each (On a Reel of 2500)
units
NAND Surface Mount 1 2 No SOIC 14 HC CMOS 6 V - 180ns 2 V 5.2mA
RS Stock No. 145-3323
Mfr. Part No.M74VHC1GU04DFT2G
PHP1.865
Each (On a Reel of 3000)
units
Inverter Surface Mount 1 - - SC-70 5 VHC Single Ended 5.5 V -8mA 15.5 ns @ 50 pF 2 V 8mA
RS Stock No. 163-0621
Mfr. Part No.MC74VHC132DTR2G
PHP7.67
Each (On a Reel of 2500)
units
NAND Surface Mount 4 2 Yes TSSOP 14 VHC CMOS 5.5 V -8mA 17.5 ns @ 50 pF 2 V 8mA
RS Stock No. 145-3638
Mfr. Part No.M74VHC1GT14DFT2G
PHP1.842
Each (On a Reel of 3000)
units
Inverter Surface Mount 1 - - SC-70 5 VHC LS-TTL 5.5 V -8mA 20.5 ns @ 50 pF 3 V 8mA
RS Stock No. 761-4473
Mfr. Part No.MM74HC132MX
PHP15.434
Each (On a Tape of 25)
units
NAND Surface Mount 4 2 No SOIC 14 HC CMOS 6 V 5.2mA 158ns 2 V 5.2mA