Please enter a valid full or partial manufacturer part number with a minimum of 3 letters or numbers

    SN74HCT02DR Search Results

    SN74HCT02DR Result Highlights (2)

    Part ECAD Model Manufacturer Description Download Buy
    SN74HCT02DRG4 Texas Instruments Quadruple 2-Input Positive-NOR Gates 14-SOIC -40 to 85 Visit Texas Instruments Buy
    SN74HCT02DR Texas Instruments Quadruple 2-Input Positive-NOR Gates 14-SOIC -40 to 85 Visit Texas Instruments Buy
    SF Impression Pixel

    SN74HCT02DR Price and Stock

    Texas Instruments SN74HCT02DR

    IC GATE NOR 4CH 2-INP 14SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74HCT02DR Digi-Reel 8,319 1
    • 1 $0.22
    • 10 $0.15
    • 100 $0.1131
    • 1000 $0.09371
    • 10000 $0.09371
    		Buy Now
    SN74HCT02DR Cut Tape 8,319 1
    • 1 $0.22
    • 10 $0.15
    • 100 $0.1131
    • 1000 $0.09371
    • 10000 $0.09371
    		Buy Now
    SN74HCT02DR Reel 7,500 2,500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.08888
    		Buy Now
    Mouser Electronics SN74HCT02DR 5,214
    • 1 $0.22
    • 10 $0.129
    • 100 $0.097
    • 1000 $0.093
    • 10000 $0.081
    		Buy Now
    Bristol Electronics SN74HCT02DR 2,827
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    		Get Quote
    SN74HCT02DR 2,495 12
    • 1 -
    • 10 -
    • 100 $0.225
    • 1000 $0.135
    • 10000 $0.09
    		Buy Now
    SN74HCT02DR 5
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    		Get Quote
    Quest Components SN74HCT02DR 7,366
    • 1 $0.1772
    • 10 $0.1772
    • 100 $0.1772
    • 1000 $0.0797
    • 10000 $0.0576
    		Buy Now
    SN74HCT02DR 1,996
    • 1 $0.6
    • 10 $0.6
    • 100 $0.18
    • 1000 $0.12
    • 10000 $0.12
    		Buy Now
    SN74HCT02DR 1,653
    • 1 $0.443
    • 10 $0.443
    • 100 $0.1329
    • 1000 $0.0886
    • 10000 $0.0886
    		Buy Now
    SN74HCT02DR 1,322
    • 1 $0.725
    • 10 $0.725
    • 100 $0.2175
    • 1000 $0.145
    • 10000 $0.145
    		Buy Now
    SN74HCT02DR 344
    • 1 $0.511
    • 10 $0.511
    • 100 $0.23
    • 1000 $0.1533
    • 10000 $0.1533
    		Buy Now
    Rochester Electronics SN74HCT02DR 1,052 1
    • 1 $0.0819
    • 10 $0.0819
    • 100 $0.077
    • 1000 $0.0696
    • 10000 $0.0696
    		Buy Now
    TME SN74HCT02DR 995 1
    • 1 $0.229
    • 10 $0.153
    • 100 $0.111
    • 1000 $0.089
    • 10000 $0.089
    		Buy Now
    Ameya Holding Limited SN74HCT02DR 317,042
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    		Get Quote
    ComSIT USA SN74HCT02DR 3,812
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    		Get Quote

    Texas Instruments SN74HCT02DRG4

    Logic Gates Quad 2Input Pos NOR Gates
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Mouser Electronics SN74HCT02DRG4 2,454
    • 1 $1.04
    • 10 $0.638
    • 100 $0.406
    • 1000 $0.277
    • 10000 $0.194
    		Buy Now

    SN74HCT02DR Datasheets (10)

    Part ECAD Model Manufacturer Description Curated Datasheet Type PDF
    SN74HCT02DR Texas Instruments Quadruple 2-Input Positive-NOR Gates 14-SOIC -40 to 85 Original PDF
    SN74HCT02DR Texas Instruments Quadruple 2-Input Positive-NOR Gates Original PDF
    SN74HCT02DR Texas Instruments Quadruple 2-Input Positive-NOR Gates Original PDF
    SN74HCT02DR Texas Instruments SN74HCT02 - Quadruple 2-Input Positive-NOR Gates 14-SOIC -40 to 85 Original PDF
    SN74HCT02DR-00 Texas Instruments SN74HCT02 - IC HCT SERIES, QUAD 2-INPUT NOR GATE, PDSO14, Gate Original PDF
    SN74HCT02DRE4 Texas Instruments Quadruple 2-Input Positive-NOR Gates 14-SOIC -40 to 85 Original PDF
    SN74HCT02DRE4 Texas Instruments Quadruple 2-Input Positive-NOR Gates Original PDF
    SN74HCT02DRE4 Texas Instruments SN74HCT02 - Quadruple 2-Input Positive-NOR Gates 14-SOIC -40 to 85 Original PDF
    SN74HCT02DRG4 Texas Instruments Quadruple 2-Input Positive-NOR Gates 14-SOIC -40 to 85 Original PDF
    SN74HCT02DRG4 Texas Instruments SN74HCT02 - Quadruple 2-Input Positive-NOR Gates 14-SOIC -40 to 85 Original PDF

    SN74HCT02DR Datasheets Context Search

    Catalog Datasheet MFG & Type Document Tags PDF

    5555 FAIRCHILD optocoupler

    Abstract: MC74HC374N 74hc14n equivalent NC7S125M5 14069 HCF4541BEY APPLICATION HCF4013BE 4026 fairchild datasheet 14543 motorola Motorola DM74LS139N
    Text: R E L I A B L E . L O G I C . I N N O V A T I O N . Logic Cross-Reference Logic Cross-Reference 2003 Texas Instruments Printed in the U.S.A. by Texoma Business Forms, Durant, Oklahoma Printed on recycled paper. SCYB017A NEW First Revision Logic Cross-Reference


    Original     		SCYB017A A010203 5555 FAIRCHILD optocoupler MC74HC374N 74hc14n equivalent NC7S125M5 14069 HCF4541BEY APPLICATION HCF4013BE 4026 fairchild datasheet 14543 motorola Motorola DM74LS139N PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT02, SN74HCT02 QUADRUPLE 2-INPUT POSITIVE-NOR GATES SCLS065E – NOVEMBER 1988 – REVISED JULY 2003 D D D Operating Voltage Range of 4.5 V to 5.5 V Outputs Can Drive Up To 10 LSTTL Loads Low Power Consumption, 20-µA Max ICC D D D D Typical tpd = 10 ns


    Original     		SN54HCT02, SN74HCT02 SCLS065E SN54HCT02 SN74HCT02 scdd003a scyd013 sdyu001x sgyc003d PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT02, SN74HCT02 QUADRUPLE 2-INPUT POSITIVE-NOR GATES SCLS065E – NOVEMBER 1988 – REVISED JULY 2003 D D D Operating Voltage Range of 4.5 V to 5.5 V Outputs Can Drive Up To 10 LSTTL Loads Low Power Consumption, 20-µA Max ICC D D D D Typical tpd = 10 ns


    Original     		SN54HCT02, SN74HCT02 SCLS065E SN54HCT02 SN74HCT02 PDF

    schematic diagram atx Power supply 500w

    Abstract: pioneer PAL 012A 1000w inverter PURE SINE WAVE schematic diagram 600va numeric ups circuit diagrams winbond bios 25064 TLE 9180 infineon smsc MEC 1300 nu TBE schematic diagram inverter 2000w DK55 circuit diagram of luminous 600va UPS
    Text: QUICK INDEX NEW IN THIS ISSUE! Detailed Index - See Pages 3-24 Digital Signal Processors, iCoupler , iMEMS® and iSensor . . . . . 805, 2707, 2768-2769 Connectors, Cable Assemblies, IC Sockets . . . . . . . . . . . 28-568 RF Connectors . . . . . . . . . . . . . . . . . . . . . . Pages 454-455


    Original     		P462-ND P463-ND LNG295LFCP2U LNG395MFTP5U US2011) schematic diagram atx Power supply 500w pioneer PAL 012A 1000w inverter PURE SINE WAVE schematic diagram 600va numeric ups circuit diagrams winbond bios 25064 TLE 9180 infineon smsc MEC 1300 nu TBE schematic diagram inverter 2000w DK55 circuit diagram of luminous 600va UPS PDF

    SN54HCT02

    Abstract: SN74HCT02 SN74HCT02D SN74HCT02DBR SN74HCT02DR SN74HCT02N SN74HCT02NSR SN74HCT02PWR SNJ54HCT02J
    Text: SN54HCT02, SN74HCT02 QUADRUPLE 2ĆINPUT POSITIVEĆNOR GATES SCLS065D – NOVEMBER 1988 – REVISED DECEMBER 2002 D Operating Voltage Range of 4.5 V to 5.5 V D Outputs Can Drive Up To 10 LSTTL Loads D Low Power Consumption, 20-µA Max ICC D D D D Typical tpd = 10 ns


    Original     		SN54HCT02, SN74HCT02 SCLS065D SN54HCT02 SN54HCT02 SN74HCT02 SN74HCT02D SN74HCT02DBR SN74HCT02DR SN74HCT02N SN74HCT02NSR SN74HCT02PWR SNJ54HCT02J PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT02, SN74HCT02 QUADRUPLE 2-INPUT POSITIVE-NOR GATES SCLS065E – NOVEMBER 1988 – REVISED JULY 2003 D D D Operating Voltage Range of 4.5 V to 5.5 V Outputs Can Drive Up To 10 LSTTL Loads Low Power Consumption, 20-µA Max ICC D D D D Typical tpd = 10 ns


    Original     		SN54HCT02, SN74HCT02 SCLS065E SN54HCT02 SN74HCT02 PDF

    SN54HCT02

    Abstract: SN74HCT02 SN74HCT02D SN74HCT02DBR SN74HCT02DR SN74HCT02DT SN74HCT02N SN74HCT02NSR SN74HCT02PW
    Text: SN54HCT02, SN74HCT02 QUADRUPLE 2-INPUT POSITIVE-NOR GATES SCLS065E – NOVEMBER 1988 – REVISED JULY 2003 D D D Operating Voltage Range of 4.5 V to 5.5 V Outputs Can Drive Up To 10 LSTTL Loads Low Power Consumption, 20-µA Max ICC D D D D Typical tpd = 10 ns


    Original     		SN54HCT02, SN74HCT02 SCLS065E SN54HCT02 SN54HCT02 SN74HCT02 SN74HCT02D SN74HCT02DBR SN74HCT02DR SN74HCT02DT SN74HCT02N SN74HCT02NSR SN74HCT02PW PDF

    SN74HCT02DR

    Abstract: SN74HCT02DBR SN74HCT02DT SN74HCT02N SN74HCT02NSR SN74HCT02PW SN54HCT02 SN74HCT02 SN74HCT02D
    Text: SN54HCT02, SN74HCT02 QUADRUPLE 2-INPUT POSITIVE-NOR GATES SCLS065E – NOVEMBER 1988 – REVISED JULY 2003 D D D Operating Voltage Range of 4.5 V to 5.5 V Outputs Can Drive Up To 10 LSTTL Loads Low Power Consumption, 20-µA Max ICC D D D D Typical tpd = 10 ns


    Original     		SN54HCT02, SN74HCT02 SCLS065E SN54HCT02 4040064/F MO-153 SN74HCT02DR SN74HCT02DBR SN74HCT02DT SN74HCT02N SN74HCT02NSR SN74HCT02PW SN54HCT02 SN74HCT02 SN74HCT02D PDF

    SN54HCT02

    Abstract: SN74HCT02 SN74HCT02D SN74HCT02DBR SN74HCT02DR SN74HCT02DT SN74HCT02N SN74HCT02NSR SN74HCT02PW
    Text: SN54HCT02, SN74HCT02 QUADRUPLE 2-INPUT POSITIVE-NOR GATES SCLS065E – NOVEMBER 1988 – REVISED JULY 2003 D D D Operating Voltage Range of 4.5 V to 5.5 V Outputs Can Drive Up To 10 LSTTL Loads Low Power Consumption, 20-µA Max ICC D D D D Typical tpd = 10 ns


    Original     		SN54HCT02, SN74HCT02 SCLS065E SN54HCT02 SN54HCT02 SN74HCT02 SN74HCT02D SN74HCT02DBR SN74HCT02DR SN74HCT02DT SN74HCT02N SN74HCT02NSR SN74HCT02PW PDF

    SN74HC573DW

    Abstract: SN74HC573N CD74ACT00 SN74HC14D sn74hc14n datasheet CD74HC14M SN74HC74D HARRIS PACKAGE LOGIC hCT CD74HC125M SN74HC138D
    Text: TEXAS INSTRUMENTS Errata to Equivalent TI Die to be Used in Select CD74HC/HCT and CD74AC/ACT Devices March 30, 1999 Abstract Texas Instruments has determined select TI SN74HC/HCT and SN74AC/ACT devices that are equivalent to CD74HC/HCT and CD74AC/ACT devices in all data book parameters. Therefore, TI will


    Original     		CD74HC/HCT CD74AC/ACT SN74HC/HCT SN74AC/ACT CD74AC/ACT ThisC32M96S2497 CD74AC32M96S5001 SN74HC573DW SN74HC573N CD74ACT00 SN74HC14D sn74hc14n datasheet CD74HC14M SN74HC74D HARRIS PACKAGE LOGIC hCT CD74HC125M SN74HC138D PDF

    CD74HC14M

    Abstract: CD74HC00M 5354A SN74HC573DW CD74HC04M HARRIS PACKAGE LOGIC hCT SN74HC14D CD74HC125M SN74HC74D CD74HC74M
    Text: TEXAS INSTRUMENTS Equivalent TI Die to be Used in Select CD74HC/HCT and CD74AC/ACT Devices March 17, 1999 Abstract Texas Instruments has determined select TI SN74HC/HCT and SN74AC/ACT devices are equivalent to CD74HC/HCT and CD74AC/ACT devices in all data book parameters. Therefore, TI will


    Original     		CD74HC/HCT CD74AC/ACT SN74HC/HCT SN74AC/ACT CD74HC/HCT. CD74AC/ACT. Cu6S2497 CD74AC32M96S5001 CD74HC14M CD74HC00M 5354A SN74HC573DW CD74HC04M HARRIS PACKAGE LOGIC hCT SN74HC14D CD74HC125M SN74HC74D CD74HC74M PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT02, SN74HCT02 QUADRUPLE 2-INPUT POSITIVE-NOR GATES SCLS065E – NOVEMBER 1988 – REVISED JULY 2003 D D D Operating Voltage Range of 4.5 V to 5.5 V Outputs Can Drive Up To 10 LSTTL Loads Low Power Consumption, 20-µA Max ICC D D D D Typical tpd = 10 ns


    Original     		SN54HCT02, SN74HCT02 SCLS065E SN54HCT02 SN74HCT02 MTSS001C 4040064/F MO-153 PDF

    CD4558

    Abstract: NC7S125 MC74F138N HCF4541 Motorola MC74HC251N 74ACT161 DHVQFN-20 74V1G08 SOT323/5 HCF4017 SN74ACT14DR
    Text: Logic Cross-Reference Introduction This Logic Cross-Reference for Buyers, Distribution Specialists and others with an interest in Logic will assist in finding a device made by Texas Instruments that is identical or similar to many of our competitors’ Logic products.


    Original     		74ABT16244 A010203 53001cov SCYB017 CD4558 NC7S125 MC74F138N HCF4541 Motorola MC74HC251N 74ACT161 DHVQFN-20 74V1G08 SOT323/5 HCF4017 SN74ACT14DR PDF

    SN54HCT02

    Abstract: SN74HCT02 SN74HCT02D SN74HCT02DBR SN74HCT02DR SN74HCT02DT SN74HCT02N SN74HCT02NSR SN74HCT02PW
    Text: SN54HCT02, SN74HCT02 QUADRUPLE 2-INPUT POSITIVE-NOR GATES SCLS065E – NOVEMBER 1988 – REVISED JULY 2003 D D D Operating Voltage Range of 4.5 V to 5.5 V Outputs Can Drive Up To 10 LSTTL Loads Low Power Consumption, 20-µA Max ICC D D D D Typical tpd = 10 ns


    Original     		SN54HCT02, SN74HCT02 SCLS065E SN54HCT02 SN54HCT02 SN74HCT02 SN74HCT02D SN74HCT02DBR SN74HCT02DR SN74HCT02DT SN74HCT02N SN74HCT02NSR SN74HCT02PW PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT02, SN74HCT02 QUADRUPLE 2-INPUT POSITIVE-NOR GATES SCLS065E – NOVEMBER 1988 – REVISED JULY 2003 D D D Operating Voltage Range of 4.5 V to 5.5 V Outputs Can Drive Up To 10 LSTTL Loads Low Power Consumption, 20-µA Max ICC D D D D Typical tpd = 10 ns


    Original     		SN54HCT02, SN74HCT02 SCLS065E SN54HCT02 SN74HCT02 PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT02, SN74HCT02 QUADRUPLE 2-INPUT POSITIVE-NOR GATES SCLS065E – NOVEMBER 1988 – REVISED JULY 2003 D D D Operating Voltage Range of 4.5 V to 5.5 V Outputs Can Drive Up To 10 LSTTL Loads Low Power Consumption, 20-µA Max ICC D D D D Typical tpd = 10 ns


    Original     		SN54HCT02, SN74HCT02 SCLS065E SN54HCT02 PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT02, SN74HCT02 QUADRUPLE 2-INPUT POSITIVE-NOR GATES SCLS065E – NOVEMBER 1988 – REVISED JULY 2003 D D D Operating Voltage Range of 4.5 V to 5.5 V Outputs Can Drive Up To 10 LSTTL Loads Low Power Consumption, 20-µA Max ICC D D D D Typical tpd = 10 ns


    Original     		SN54HCT02, SN74HCT02 SCLS065E SN54HCT02 PDF

    MC0628R

    Abstract: 40373 74hc14n equivalent 4046 application note philips HCF4060BE HCF4017BE SN74121 application note MC74HC373DW mc0628 HCF4053BE
    Text: R E L I A B L E . L O G I C . I N N O V A T I O N . Logic Cross-Reference Logic Cross-Reference 2003 Texas Instruments Printed in the U.S.A. by Texoma Business Forms, Durant, Oklahoma Printed on recycled paper. SCYB017A NEW First Revision Logic Cross-Reference


    Original     		SCYB017A T74ALVC32374 74CBTLV16211 SN74CBTD16211 SN74SSTV16859 SN74CBTLV16211GRDR SN74ALVC16245AGRDR -SN74SSTV16859GKER MC0628R 40373 74hc14n equivalent 4046 application note philips HCF4060BE HCF4017BE SN74121 application note MC74HC373DW mc0628 HCF4053BE PDF

    220v AC voltage stabilizer schematic diagram

    Abstract: LG color tv Circuit Diagram tda 9370 1000w inverter PURE SINE WAVE schematic diagram schematic diagram atx Power supply 500w TV SHARP IC TDA 9381 PS circuit diagram wireless spy camera 9744 mini mainboard v1.2 sony 279-87 transistor E 13005-2 superpro lx
    Text: QUICK INDEX NEW IN THIS ISSUE! Detailed Index - See Pages 3-24 AD9272 Analog Front End, iMEMS Accelerometers & Gyroscopes . . . . . . 782, 2583 Connectors, Cable Assemblies, IC Sockets . . . . . . . . . . . 28-528 Acceleration and Pressure Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2585


    Original     		AD9272 P462-ND LNG295LFCP2U P463-ND LNG395MFTP5U 220v AC voltage stabilizer schematic diagram LG color tv Circuit Diagram tda 9370 1000w inverter PURE SINE WAVE schematic diagram schematic diagram atx Power supply 500w TV SHARP IC TDA 9381 PS circuit diagram wireless spy camera 9744 mini mainboard v1.2 sony 279-87 transistor E 13005-2 superpro lx PDF

    CD74HC14M

    Abstract: HARRIS PACKAGE LOGIC hCT SN74HC14D CD74HC125M SN74HC04DR SN74HC74D SN74HC04D SN74HC125D CD74HC74M CD74HC00M
    Text: TEXAS INSTRUMENTS Errata to Equivalent TI Die to be Used in Select CD74HC/HCT and CD74AC/ACT Devices April 9, 1999 Abstract Texas Instruments has determined select TI SN74HC/HCT and SN74AC/ACT devices that are equivalent to CD74HC/HCT and CD74AC/ACT devices in all data book parameters. Therefore, TI will


    Original     		CD74HC/HCT CD74AC/ACT SN74HC/HCT SN74AC/ACT CD74AC/ACT SN74ACT374N CD74AC32M96 CD74HC14M HARRIS PACKAGE LOGIC hCT SN74HC14D CD74HC125M SN74HC04DR SN74HC74D SN74HC04D SN74HC125D CD74HC74M CD74HC00M PDF

    SN54HCT02

    Abstract: SN74HCT02 SN74HCT02D SN74HCT02DBR SN74HCT02DR SN74HCT02DT SN74HCT02N SN74HCT02NSR SN74HCT02PW
    Text: SN54HCT02, SN74HCT02 QUADRUPLE 2-INPUT POSITIVE-NOR GATES SCLS065E – NOVEMBER 1988 – REVISED JULY 2003 D D D Operating Voltage Range of 4.5 V to 5.5 V Outputs Can Drive Up To 10 LSTTL Loads Low Power Consumption, 20-µA Max ICC D D D D Typical tpd = 10 ns


    Original     		SN54HCT02, SN74HCT02 SCLS065E SN54HCT02 SN54HCT02 SN74HCT02 SN74HCT02D SN74HCT02DBR SN74HCT02DR SN74HCT02DT SN74HCT02N SN74HCT02NSR SN74HCT02PW PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT02, SN74HCT02 QUADRUPLE 2ĆINPUT POSITIVEĆNOR GATES SCLS065D – NOVEMBER 1988 – REVISED DECEMBER 2002 D Operating Voltage Range of 4.5 V to 5.5 V D Outputs Can Drive Up To 10 LSTTL Loads D Low Power Consumption, 20-µA Max ICC D D D D Typical tpd = 10 ns


    Original     		SN54HCT02, SN74HCT02 SCLS065D SN54HCT02 SN74HCT02 PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT02, SN74HCT02 QUADRUPLE 2ĆINPUT POSITIVEĆNOR GATES SCLS065D – NOVEMBER 1988 – REVISED DECEMBER 2002 D Operating Voltage Range of 4.5 V to 5.5 V D Outputs Can Drive Up To 10 LSTTL Loads D Low Power Consumption, 20-µA Max ICC D D D D Typical tpd = 10 ns


    Original     		SN54HCT02, SN74HCT02 SCLS065D SN54HCT02 SN74HCT02 SN74HCT02NSR SN74HCT02PW SN74HCT02PWR PDF

    SN54HCT02

    Abstract: SN74HCT02 SN74HCT02D SN74HCT02DBR SN74HCT02DR SN74HCT02DT SN74HCT02N SN74HCT02NSR SN74HCT02PW
    Text: SN54HCT02, SN74HCT02 QUADRUPLE 2-INPUT POSITIVE-NOR GATES SCLS065E – NOVEMBER 1988 – REVISED JULY 2003 D D D Operating Voltage Range of 4.5 V to 5.5 V Outputs Can Drive Up To 10 LSTTL Loads Low Power Consumption, 20-µA Max ICC D D D D Typical tpd = 10 ns


    Original     		SN54HCT02, SN74HCT02 SCLS065E SN54HCT02 4040064/F MO-153 SN54HCT02 SN74HCT02 SN74HCT02D SN74HCT02DBR SN74HCT02DR SN74HCT02DT SN74HCT02N SN74HCT02NSR SN74HCT02PW PDF