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. 662-8922
Mfr. Part No.SN74LVC2G132DCUT
R 13.508
Each (In a Pack of 5)
units
NAND Surface Mount 2 2 Yes VSSOP 8 LVC Schmitt Trigger 5.5 V -32mA 5 ns @ 5 V, 6 ns @ 3.3 V 1.65 V 32mA
RS stock no. 162-6972
Mfr. Part No.CD74HCT21M96
R 1.697
Each (On a Reel of 2500)
units
AND Surface Mount 2 4 No SOIC 14 HCT - 5.5 V -4mA 27 ns @ 4.5 V 4.5 V 4mA
RS stock no. 170-7964
Mfr. Part No.HEF4093BT,653
BrandNexperia
R 1.809
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. 355-9167
Mfr. Part No.HEF4093BT,652
BrandNexperia
R 9.06
Each
units
NAND Surface Mount 4 2 Yes SOIC 14 4000 Schmitt Trigger 15 V -4.2mA 60 ns @ 15 V, 80 ns @ 10 V, 185 ns @ 5 V 3 V 4.2mA
RS stock no. 662-7282
Mfr. Part No.CD74HCT21M96
R 1.63
Each (In a Pack of 10)
units
AND Surface Mount 2 4 No SOIC 14 HCT - 5.5 V -4mA 27 ns @ 4.5 V 4.5 V 4mA
RS stock no. 179-2124
Mfr. Part No.CD74HCT00M96
R 6.435
Each (In a Tube of 50)
units
NAND Surface Mount 4 2 No SOIC 14 HCT - 5.5 V -4mA 20 ns @ 4.5 V 4.5 V 4mA
RS stock no. 923-2300
Mfr. Part No.SN7432N
R 31.62
Each (In a Tube of 25)
units
OR Through Hole 4 2 No PDIP 14 74 - 5.25 V -0.8mA 22 ns @ 5 V 4.75 V 16mA
RS stock no. 162-7480
Mfr. Part No.SN74LVC1G97DCKR
R 1.334
Each (On a Reel of 3000)
units
Multifunction Surface Mount 1 3 Yes SC-70 6 LVC Schmitt Trigger 5.5 V -32mA 5.1 ns @ 5 V, 6.3 ns @ 3.3 V 1.65 V 32mA
RS stock no. 145-3638
Mfr. Part No.M74VHC1GT14DFT2G
R 0.384
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. 663-1815
Mfr. Part No.SN74F21D
R 4.444
Each (In a Pack of 5)
units
AND Surface Mount 2 4 No SOIC 14 F - 5.5 V -1mA 5.1 ns @ 5 V 4.5 V 20mA
RS stock no. 333-2748
Mfr. Part No.SN74HC00N
R 8.252
Each (In a Tube of 25)
units
NAND Through Hole 4 2 No PDIP 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. 662-8994
Mfr. Part No.SN74LVC32ADR
R 1.143
Each (In a Pack of 10)
units
OR Surface Mount 4 2 No SOIC 14 LVC - 3.6 V -24mA 3.6 ns @ 3.3 V, 4.2 ns @ 2.7 V 1.65 V 24mA
RS stock no. 805-1570
Mfr. Part No.M74VHC1GT86DFT2G
R 0.48
Each (In a Pack of 100)
units
XOR Surface Mount 1 2 No SC-88A 5 VHC TTL 5.5 V -8mA 19.5 ns @ 50 pF 3 V 8mA
RS stock no. 670-9790
Mfr. Part No.NC7SZ08M5X
R 4.919
Each (In a Pack of 10)
units
AND Surface Mount 1 2 No SOT-23 5 TinyLogic UHS - 5.5 V -32mA 4.5 ns @ 5 V, 5.2 ns @ 3.3 V 1.65 V 32mA
RS stock no. 761-4561
Mfr. Part No.NC7SZ86M5X
R 4.511
Each (In a Pack of 25)
units
OR Surface Mount 1 2 No SOT-23 5 - CMOS 5.5 V -32mA 6.5ns 1.65 V 32mA
RS stock no. 775-7738
Mfr. Part No.74HC1G00GW,125
BrandNexperia
R 0.819
Each (In a Bag of 30)
units
NAND Surface Mount 1 2 No TSSOP 5 HC CMOS 6 V -2.6mA 135ns 2 V 2.6mA
RS stock no. 662-7377
Mfr. Part No.CD74HCT86M96
R 8.262
Each (In a Pack of 10)
units
XOR Surface Mount 4 2 No SOIC 14 HCT - 5.5 V -4mA 32 ns @ 4.5 V 4.5 V 4mA
RS stock no. 169-8532
Mfr. Part No.NC7SZ08M5X
R 1.166
Each (On a Reel of 3000)
units
AND Surface Mount 1 2 No SOT-23 5 TinyLogic UHS - 5.5 V -32mA 4.5 ns @ 5 V, 5.2 ns @ 3.3 V 1.65 V 32mA
RS stock no. 112-9966
Mfr. Part No.74HCT00D,652
BrandNexperia
R 5.468
Each (In a Pack of 57)
units
NAND Surface Mount 4 2 No SOIC 14 HCT - 5.5 V -4mA - 4.5 V 4mA
RS stock no. 163-0586
Mfr. Part No.MC74HC00ADR2G
R 1.546
Each (On a Reel of 2500)
units
NAND Surface Mount 4 2 No SOIC 14 LS CMOS 6 V 5.2mA 110 ns @ 50 pF 2 V 5.2mA