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. 166-1437
Mfr. Part No.74AHC1G08GW,125
BrandNexperia
HK$0.274
Each (On a Reel of 3000)
units
AND Surface Mount 1 2 No TSSOP 5 AHC - 5.5 V -8mA 7.9 ns @ 4.5 V to 5.5 V, 12.3 ns @ 3 V to 3.6 V 2 V 8mA
RS Stock No. 442-993
Mfr. Part No.SN74HC86N
HK$3.83
Each
units
XOR Through Hole 4 2 No PDIP 14 HC - 6 V -5.2mA 17 ns @ 6 V, 20 ns @ 4.5 V, 100 ns @ 2 V 2 V 5.2mA
RS Stock No. 162-7416
Mfr. Part No.SN74LS38NE4
HK$5.638
Each (In a Tube of 25)
units
NAND Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.25mA 32 ns @ 5 V 4.75 V 24mA
RS Stock No. 121-8309
Mfr. Part No.SN74HC86N
HK$3.542
Each (In a Tube of 25)
units
XOR Through Hole 4 2 - PDIP 14 HC - 6 V -5.2mA 17 ns @ 6 V, 20 ns @ 4.5 V, 100 ns @ 2 V 2 V 5.2mA
RS Stock No. 510-087
Mfr. Part No.74AHC1G08GW,125
BrandNexperia
HK$1.288
Each (In a Pack of 50)
units
AND Surface Mount 1 2 No TSSOP 5 AHC - 5.5 V -8mA 7.9 ns @ 4.5 V → 5.5 V, 12.3 ns @ 3 V → 3.6 V 2 V 8mA
RS Stock No. 663-1221
Mfr. Part No.SN74AHCT08D
HK$2.688
Each (In a Pack of 10)
units
AND Surface Mount 4 2 No SOIC 14 AHCT - 5.5 V -8mA 7.9 ns @ 5 V 4.5 V 8mA
RS Stock No. 145-0851
Mfr. Part No.SN74LVC1G86DCKT
HK$4.769
Each (On a Reel of 250)
units
XOR Surface Mount 1 2 No SC-70 5 LVC - 5.5 V -32mA 4 ns @ 5 V, 5 ns @ 3.3 V 1.65 V 32mA
RS Stock No. 217-5645
Mfr. Part No.SN74HC32N
HK$4.68
Each
units
OR Through Hole 4 2 No PDIP 14 HC - 6 V -5.2mA 17 ns @ 6 V, 20 ns @ 4.5 V, 100 ns @ 2 V 2 V 5.2mA
RS Stock No. 527-924
Mfr. Part No.CD40107BE
HK$4.371
Each (In a Tube of 50)
units
NAND Through Hole 2 2 No PDIP 8 4000 - 18 V - 100 ns @ 15 V, 120 ns @ 10 V, 200 ns @ 5 V 3 V 89mA
RS Stock No. 145-0438
Mfr. Part No.CD74HCT11M
HK$3.451
Each (In a Tube of 50)
units
AND Surface Mount 3 3 No SOIC 14 HCT - 5.5 V -4mA 28 ns @ 4.5 V 4.5 V 4mA
RS Stock No. 179-2163
Mfr. Part No.SN74AHCT08D
HK$2.688
Each (In a Tube of 50)
units
AND Surface Mount 4 2 No SOIC 14 AHCT - 5.5 V -8mA 7.9 ns @ 5 V 4.5 V 8mA
RS Stock No. 166-1444
Mfr. Part No.74LVC1G32GW,125
BrandNexperia
HK$0.325
Each (On a Reel of 3000)
units
OR Surface Mount 1 2 No TSSOP 5 LVC - 5.5 V -32mA - 1.65 V 32mA
RS Stock No. 663-0468
Mfr. Part No.CD74HCT11M
HK$3.451
Each (In a Pack of 10)
units
AND Surface Mount 3 3 No SOIC 14 HCT - 5.5 V -4mA 28 ns @ 4.5 V 4.5 V 4mA
RS Stock No. 633-953
Mfr. Part No.CD74HCT32E
HK$5.11
Each
units
OR Through Hole 4 2 No PDIP 14 HCT - 5.5 V -4mA 24 ns @ 4.5 V 4.5 V 4mA
RS Stock No. 670-9790
Mfr. Part No.NC7SZ08M5X
HK$2.585
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. 791-6072
Mfr. Part No.MC14001BDR2G
HK$2.984
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. 806-2157
Mfr. Part No.MC74AC11DR2G
HK$3.327
Each (On a Tape of 50)
units
AND Surface Mount 3 3 No SOIC 14 AC TTL 6 V -24mA 10 ns @ 50 pF 2 V 24mA
RS Stock No. 540-0512
Mfr. Part No.TC7S32F(F)
BrandToshiba
HK$2.184
Each (In a Pack of 5)
units
OR Surface Mount 1 2 No SSOP 5 HC - 6 V -2.6mA 17 ns @ 6 V, 20 ns @ 4.5 V, 100 ns @ 2 V 2 V 2.6mA
RS Stock No. 169-5655
Mfr. Part No.SN74AC00DR
HK$1.555
Each (On a Reel of 2500)
units
NAND Surface Mount 4 2 No SOIC 14 AC - 6 V -24mA 8 ns @ 5 V, 9.5 ns @ 3.3 V 2 V 24mA
RS Stock No. 662-8910
Mfr. Part No.SN74LVC2G08DCTR
HK$4.676
Each (In a Pack of 5)
units
AND Surface Mount 2 2 No SSOP 8 LVC - 5.5 V -32mA 3.8 ns @ 5 V, 4.7 ns @ 3.3 V 1.65 V 32mA
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