# 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 GateLogic 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 thepositive 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.ApplicationsAs 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
 New RS Stock No. 166-2402 Mfr. Part No.74LCX08MX BrandON Semiconductor Compare HK\$1.754 Each (On a Reel of 2500) units AND Surface Mount 4 2 No SOIC 14 LCX - 3.6 V -24mA 5.5 ns @ 3.3 V, 6.2 ns @ 2.7 V 2 V 24mA New RS Stock No. 145-1237 Mfr. Part No.SN74AHCT02D BrandTexas Instruments Compare HK\$2.675 Each (In a Tube of 50) units NOR Surface Mount 4 2 No SOIC 14 AHCT - 5.5 V -8mA 7.5 ns @ 5 V 4.5 V 8mA New RS Stock No. 146-0953 Mfr. Part No.ULN2003V12T16-13 BrandDiodesZetex Compare HK\$1.303 Each (On a Reel of 2500) units - Surface Mount - - - TSSOP 16 - CMOS 5 V - 140ns 3.3 V 140mA New RS Stock No. 170-7993 Mfr. Part No.HEF4011BT,653 BrandNexperia Compare HK\$1.00 Each (On a Reel of 2500) units NAND Surface Mount 4 2 - SO 14 HEF CMOS 15 V -4.2mA 110 ns @ 50 pF 3 V 4.2mA New RS Stock No. 807-2545 Mfr. Part No.SN74AC11N BrandTexas Instruments Compare HK\$4.116 Each (In a Pack of 25) units AND Through Hole 3 3 No PDIP 14 AC Differential 6 V -75mA 10 ns @ 50 pF 2 V 75mA New RS Stock No. 816-8820 Mfr. Part No.74LVC2G32DC,125 BrandNexperia Compare HK\$3.16 Each (In a Pack of 10) units OR Surface Mount 2 2 No VSSOP 8 LVC TTL 5.5 V -32mA 6 ns @ 50 pF 1.65 V 32mA New RS Stock No. 163-0474 Mfr. Part No.MC100EP08DG BrandON Semiconductor Compare HK\$55.938 Each (In a Tube of 98) units XOR/XNOR Surface Mount 1 2 No SOIC 8 EP ECL 5.5 V - 320ps -3 V 0.5µA New RS Stock No. 761-4568 Mfr. Part No.NC7WZ08K8X BrandON Semiconductor Compare HK\$2.881 Each (On a Tape of 25) units AND Surface Mount 2 2 No US 8 - CMOS 5.5 V -32mA 5.2ns 1.65 V 32mA New RS Stock No. 145-0856 Mfr. Part No.CD4023BM BrandTexas Instruments Compare HK\$3.401 Each (In a Tube of 50) units NAND Surface Mount 3 3 No SOIC 14 4000 - 18 V -4.2mA 90 ns @ 15 V, 120 ns @ 10 V, 250 ns @ 5 V 3 V 4.2mA New RS Stock No. 761-4334 Mfr. Part No.74LCX08MX BrandON Semiconductor Compare HK\$4.361 Each (On a Tape of 10) units AND Surface Mount 4 2 No SOIC 14 LCX CMOS 3.6 V -24mA 6.2ns 2 V 24mA New RS Stock No. 759-6696 Mfr. Part No.74AC86SC BrandON Semiconductor Compare HK\$4.191 Each (In a Pack of 55) units XOR Surface Mount 4 2 No SOIC 14 AC - 6 V -75mA 12.5ns 2 V 75mA New RS Stock No. 539-9282 Mfr. Part No.TC74HC08AP(F) BrandToshiba Compare HK\$3.75 Each (In a Pack of 5) units AND Through Hole 4 2 No PDIP 14 HC - 6 V -5.2mA 13 ns @ 6 V, 15 ns @ 4.5 V, 75 ns @ 2 V 2 V 5.2mA New RS Stock No. 923-2335 Mfr. Part No.SN74LS08N BrandTexas Instruments Compare HK\$4.565 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 New RS Stock No. 166-3070 Mfr. Part No.NC7SZ58P6X BrandON Semiconductor Compare HK\$0.596 Each (On a Reel of 3000) units Multifunction Surface Mount 1 2 No SC-70 6 - CMOS 5.5 V -32mA 6.5ns 1.65 V 32mA New RS Stock No. 802-1705 Mfr. Part No.NL7SZ57DFT2G BrandON Semiconductor Compare HK\$0.88 Each (On a Tape of 100) units Multifunction Surface Mount 1 3 - SC-88 6 NL Schmitt Trigger 5.5 V -32mA 14.4ns 1.65 V 32mA New RS Stock No. 162-6936 Mfr. Part No.CD74ACT86M96 BrandTexas Instruments Compare HK\$1.774 Each (On a Reel of 2500) units XOR Surface Mount 4 2 No SOIC 14 ACT - 5.5 V -24mA 14.6 ns @ 5 V 4.5 V 24mA New RS Stock No. 539-9349 Mfr. Part No.TC74HC21AP(F) BrandToshiba Compare HK\$3.40 Each (In a Pack of 5) units AND Through Hole 2 4 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 New RS Stock No. 162-7325 Mfr. Part No.SN74AHCT86PWR BrandTexas Instruments Compare HK\$0.78 Each (On a Reel of 2000) units XOR Surface Mount 4 2 No TSSOP 14 AHCT - 5.5 V -8mA 8.8 ns @ 5 V 4.5 V 8mA New RS Stock No. 169-7484 Mfr. Part No.74LV86AT14-13 BrandDiodesZetex Compare HK\$0.864 Each (On a Reel of 2500) units XOR Surface Mount 4 2 Yes TSSOP 14 LV Schmitt Trigger 5.5 V -12mA 11 ns @ 50 pF 2 V 12mA New RS Stock No. 813-9285 Mfr. Part No.74HC1G08GV,125 BrandNexperia Compare HK\$0.771 Each (On a Tape of 100) units AND Surface Mount 1 2 No SC-74A 5 HC CMOS 6 V -2.6mA 135 ns @ 50 pF 2 V 2.6mA
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