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

    SN74HCT646 Search Results

    SN74HCT646 Result Highlights (1)

    Part ECAD Model Manufacturer Description Download Buy
    SN74HCT646DW Texas Instruments Octal Bus Transceivers And Registers With 3-State Outputs 24-SOIC -40 to 85 Visit Texas Instruments Buy
    SF Impression Pixel

    SN74HCT646 Price and Stock

    Texas Instruments SN74HCT646DW

    IC TXRX NON-INVERT 5.5V 24SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74HCT646DW Tube 1
    • 1 $1.77
    • 10 $1.587
    • 100 $1.2757
    • 1000 $0.86845
    • 10000 $0.77861
    Buy Now
    Mouser Electronics SN74HCT646DW 877
    • 1 $1.78
    • 10 $1.53
    • 100 $1.27
    • 1000 $0.868
    • 10000 $0.778
    Buy Now
    Quest Components SN74HCT646DW 661
    • 1 $1.3785
    • 10 $1.3785
    • 100 $1.3785
    • 1000 $0.6893
    • 10000 $0.6893
    Buy Now
    SN74HCT646DW 20
    • 1 $2.2056
    • 10 $1.6542
    • 100 $1.3785
    • 1000 $1.3785
    • 10000 $1.3785
    Buy Now
    Rochester Electronics SN74HCT646DW 6,799 1
    • 1 $0.8648
    • 10 $0.8648
    • 100 $0.8129
    • 1000 $0.7351
    • 10000 $0.7351
    Buy Now

    Rochester Electronics LLC SN74HCT646NT

    IC TXRX NON-INVERT 5.5V 24DIP
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74HCT646NT Tube 278
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.08
    • 10000 $1.08
    Buy Now

    Texas Instruments SN74HCT646NT

    IC TXRX NON-INVERT 5.5V 24DIP
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74HCT646NT Tube
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Buy Now
    Bristol Electronics SN74HCT646NT 30
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    SN74HCT646NT 2,138 3
    • 1 -
    • 10 $1.6875
    • 100 $0.6328
    • 1000 $0.4388
    • 10000 $0.4388
    Buy Now
    Quest Components SN74HCT646NT 2
    • 1 $1.8
    • 10 $1.8
    • 100 $1.8
    • 1000 $1.8
    • 10000 $1.8
    Buy Now
    SN74HCT646NT 1,710
    • 1 $2.25
    • 10 $2.25
    • 100 $2.25
    • 1000 $0.585
    • 10000 $0.5625
    Buy Now
    SN74HCT646NT 8
    • 1 $3.04
    • 10 $2.28
    • 100 $2.28
    • 1000 $2.28
    • 10000 $2.28
    Buy Now
    Rochester Electronics SN74HCT646NT 11,722 1
    • 1 $1.09
    • 10 $1.09
    • 100 $1.03
    • 1000 $0.9283
    • 10000 $0.9283
    Buy Now

    Rochester Electronics LLC SN74HCT646DW

    IC TXRX NON-INVERT 5.5V 24SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74HCT646DW Bulk 351
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.86
    • 10000 $0.86
    Buy Now

    Texas Instruments SN74HCT646DWR

    IC TXRX NON-INVERT 5.5V 24SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74HCT646DWR Reel 2,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.59727
    Buy Now
    Quest Components SN74HCT646DWR 1,000
    • 1 $1.0878
    • 10 $1.0878
    • 100 $0.5076
    • 1000 $0.4533
    • 10000 $0.4533
    Buy Now
    Rochester Electronics SN74HCT646DWR 2,000 1
    • 1 $0.5688
    • 10 $0.5688
    • 100 $0.5347
    • 1000 $0.4835
    • 10000 $0.4835
    Buy Now

    SN74HCT646 Datasheets (38)

    Part ECAD Model Manufacturer Description Curated Type PDF
    SN74HCT646 Texas Instruments OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS Original PDF
    SN74HCT646 Texas Instruments OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS Original PDF
    SN74HCT646DW Texas Instruments OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS Original PDF
    SN74HCT646DW Texas Instruments Octal Bus Transceivers And Registers With 3-State Outputs 24-SOIC -40 to 85 Original PDF
    SN74HCT646DW Texas Instruments Octal Bus Transceiver and Register with 3-State Outputs Original PDF
    SN74HCT646DW Texas Instruments Logic - Buffers, Drivers, Receivers, Transceivers, Integrated Circuits (ICs), IC BUS TRANSCEIVER 8BIT 24SOIC Original PDF
    SN74HCT646DW Unknown Historical semiconductor price guide (US$ - 1998). From our catalog scanning project. Historical PDF
    SN74HCT646DW Texas Instruments OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS Scan PDF
    SN74HCT646DW-00 Texas Instruments SN74HCT646 - IC HCT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24, Bus Driver/Transceiver Original PDF
    SN74HCT646DWE4 Texas Instruments Octal Bus Transceivers And Registers With 3-State Outputs 24-SOIC -40 to 85 Original PDF
    SN74HCT646DWE4 Texas Instruments Octal Bus Transceivers And Registers With 3-State Outputs Original PDF
    SN74HCT646DWE4 Texas Instruments Logic - Buffers, Drivers, Receivers, Transceivers, Integrated Circuits (ICs), IC BUS TRANSCEIVER 8BIT 24SOIC Original PDF
    SN74HCT646DWG4 Texas Instruments Octal Bus Transceivers And Registers With 3-State Outputs 24-SOIC -40 to 85 Original PDF
    SN74HCT646DWG4 Texas Instruments Logic - Buffers, Drivers, Receivers, Transceivers, Integrated Circuits (ICs), IC BUS TRANSCEIVER 8BIT 24SOIC Original PDF
    SN74HCT646DWR Texas Instruments Octal Bus Transceivers And Registers With 3-State Outputs 24-SOIC -40 to 85 Original PDF
    SN74HCT646DWR Texas Instruments Octal Bus Transceiver and Register with 3-State Outputs Original PDF
    SN74HCT646DWR Texas Instruments Original PDF
    SN74HCT646DWR Texas Instruments Logic - Buffers, Drivers, Receivers, Transceivers, Integrated Circuits (ICs), IC BUS TRANSCEIVER 8BIT 24SOIC Original PDF
    SN74HCT646DWR-00 Texas Instruments SN74HCT646 - IC HCT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24, Bus Driver/Transceiver Original PDF
    SN74HCT646DWRE4 Texas Instruments Octal Bus Transceivers And Registers With 3-State Outputs 24-SOIC -40 to 85 Original PDF

    SN74HCT646 Datasheets Context Search

    Catalog Datasheet MFG & Type PDF Document Tags

    HCT646

    Abstract: SN54HCT646 SN74HCT646 SN74HCT646DW SN74HCT646DWR SN74HCT646NT SNJ54HCT646FK SNJ54HCT646JT SNJ54HCT646W
    Text: SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS178C – MARCH 1984 – REVISED MARCH 2003 D D D D Operating Voltage Range of 4.5 V to 5.5 V Low Power Consumption, 80-µA Max ICC Typical tpd = 12 ns ±6-mA Output Drive at 5 V


    Original
    PDF SN54HCT646, SN74HCT646 SCLS178C SN54HCT646 HCT646 SN54HCT646 SN74HCT646 SN74HCT646DW SN74HCT646DWR SN74HCT646NT SNJ54HCT646FK SNJ54HCT646JT SNJ54HCT646W

    HCT646

    Abstract: SN54HCT646 SN74HCT646 SN74HCT646DW SN74HCT646DWR SN74HCT646NT SNJ54HCT646FK SNJ54HCT646JT SNJ54HCT646W
    Text: SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS178C – MARCH 1984 – REVISED MARCH 2003 D D D D Operating Voltage Range of 4.5 V to 5.5 V Low Power Consumption, 80-µA Max ICC Typical tpd = 12 ns ±6-mA Output Drive at 5 V


    Original
    PDF SN54HCT646, SN74HCT646 SCLS178C SN54HCT646 HCT646 SN54HCT646 SN74HCT646 SN74HCT646DW SN74HCT646DWR SN74HCT646NT SNJ54HCT646FK SNJ54HCT646JT SNJ54HCT646W

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS178C – MARCH 1984 – REVISED MARCH 2003 D D D D Operating Voltage Range of 4.5 V to 5.5 V Low Power Consumption, 80-µA Max ICC Typical tpd = 12 ns ±6-mA Output Drive at 5 V


    Original
    PDF SN54HCT646, SN74HCT646 SCLS178C SN54HCT646

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS178C – MARCH 1984 – REVISED MARCH 2003 D D D D Operating Voltage Range of 4.5 V to 5.5 V Low Power Consumption, 80-µA Max ICC Typical tpd = 12 ns ±6-mA Output Drive at 5 V


    Original
    PDF SN54HCT646, SN74HCT646 SCLS178C SN54HCT646 SN74HCT646 14pplication

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS178C – MARCH 1984 – REVISED MARCH 2003 D D D D Operating Voltage Range of 4.5 V to 5.5 V Low Power Consumption, 80-µA Max ICC Typical tpd = 12 ns ±6-mA Output Drive at 5 V


    Original
    PDF SN54HCT646, SN74HCT646 SCLS178C SN54HCT646

    HCT646

    Abstract: SN54HCT646 SN74HCT646
    Text: SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS178B – MARCH 1984 – REVISED MAY 1997 D Inputs Are TTL-Voltage Compatible Independent Registers for A and B Buses Multiplexed Real-Time and Stored Data True Data Paths


    Original
    PDF SN54HCT646, SN74HCT646 SCLS178B 300-mil SN54HCT646 HCT646 SN54HCT646 SN74HCT646

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS178C – MARCH 1984 – REVISED MARCH 2003 D D D D Operating Voltage Range of 4.5 V to 5.5 V Low Power Consumption, 80-µA Max ICC Typical tpd = 12 ns ±6-mA Output Drive at 5 V


    Original
    PDF SN54HCT646, SN74HCT646 SCLS178C SN54HCT646 SN74HCT646

    SN54HCT646

    Abstract: SN74HCT646 SN74HCT646DW SN74HCT646DWR SN74HCT646NT SNJ54HCT646FK SNJ54HCT646JT SNJ54HCT646W HCT646
    Text: SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS178C – MARCH 1984 – REVISED MARCH 2003 D D D D Operating Voltage Range of 4.5 V to 5.5 V Low Power Consumption, 80-µA Max ICC Typical tpd = 12 ns ±6-mA Output Drive at 5 V


    Original
    PDF SN54HCT646, SN74HCT646 SCLS178C SN54HCT646 SN54HCT646 SN74HCT646 SN74HCT646DW SN74HCT646DWR SN74HCT646NT SNJ54HCT646FK SNJ54HCT646JT SNJ54HCT646W HCT646

    HCT646

    Abstract: SN54HCT646 SN74HCT646 SN74HCT646DW SN74HCT646DWR SN74HCT646NT SNJ54HCT646FK SNJ54HCT646JT SNJ54HCT646W
    Text: SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS178C – MARCH 1984 – REVISED MARCH 2003 D D D D Operating Voltage Range of 4.5 V to 5.5 V Low Power Consumption, 80-µA Max ICC Typical tpd = 12 ns ±6-mA Output Drive at 5 V


    Original
    PDF SN54HCT646, SN74HCT646 SCLS178C SN54HCT646 HCT646 SN54HCT646 SN74HCT646 SN74HCT646DW SN74HCT646DWR SN74HCT646NT SNJ54HCT646FK SNJ54HCT646JT SNJ54HCT646W

    HCT646

    Abstract: SN54HCT646 SN74HCT646 SN74HCT646DW SN74HCT646DWR SN74HCT646NT SNJ54HCT646FK SNJ54HCT646JT SNJ54HCT646W
    Text: SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS178C – MARCH 1984 – REVISED MARCH 2003 D D D D Operating Voltage Range of 4.5 V to 5.5 V Low Power Consumption, 80-µA Max ICC Typical tpd = 12 ns ±6-mA Output Drive at 5 V


    Original
    PDF SN54HCT646, SN74HCT646 SCLS178C SN54HCT646 HCT646 SN54HCT646 SN74HCT646 SN74HCT646DW SN74HCT646DWR SN74HCT646NT SNJ54HCT646FK SNJ54HCT646JT SNJ54HCT646W

    HCT646

    Abstract: SN54HCT646 SN74HCT646 SCLS178A
    Text: SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS178A – MARCH 1984 – REVISED JANUARY 1996 D D D D Inputs Are TTL-Voltage Compatible Independent Registers for A and B Buses Multiplexed Real-Time and Stored Data True Data Paths


    Original
    PDF SN54HCT646, SN74HCT646 SCLS178A 300-mil SN54HCT646 HCT646 SN54HCT646 SN74HCT646 SCLS178A

    HCT646

    Abstract: SN54HCT646 SN74HCT646 SN74HCT646DW SN74HCT646DWR SN74HCT646NT SNJ54HCT646FK SNJ54HCT646JT SNJ54HCT646W
    Text: SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS178C – MARCH 1984 – REVISED MARCH 2003 D D D D Operating Voltage Range of 4.5 V to 5.5 V Low Power Consumption, 80-µA Max ICC Typical tpd = 12 ns ±6-mA Output Drive at 5 V


    Original
    PDF SN54HCT646, SN74HCT646 SCLS178C SN54HCT646 HCT646 SN54HCT646 SN74HCT646 SN74HCT646DW SN74HCT646DWR SN74HCT646NT SNJ54HCT646FK SNJ54HCT646JT SNJ54HCT646W

    HCT646

    Abstract: SN54HCT646 SN74HCT646 SCLS178B
    Text: SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS178B – MARCH 1984 – REVISED MAY 1997 D Inputs Are TTL-Voltage Compatible Independent Registers for A and B Buses Multiplexed Real-Time and Stored Data True Data Paths


    Original
    PDF SN54HCT646, SN74HCT646 SCLS178B 300-mil SN54HCT646 HCT646 SN54HCT646 SN74HCT646 SCLS178B

    HCT646

    Abstract: SN54HCT646 SN74HCT646 SN74HCT646DW SN74HCT646DWR SN74HCT646NT SNJ54HCT646FK SNJ54HCT646JT SNJ54HCT646W
    Text: SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS178C – MARCH 1984 – REVISED MARCH 2003 D D D D Operating Voltage Range of 4.5 V to 5.5 V Low Power Consumption, 80-µA Max ICC Typical tpd = 12 ns ±6-mA Output Drive at 5 V


    Original
    PDF SN54HCT646, SN74HCT646 SCLS178C SN54HCT646 HCT646 SN54HCT646 SN74HCT646 SN74HCT646DW SN74HCT646DWR SN74HCT646NT SNJ54HCT646FK SNJ54HCT646JT SNJ54HCT646W

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS178C – MARCH 1984 – REVISED MARCH 2003 D D D D Operating Voltage Range of 4.5 V to 5.5 V Low Power Consumption, 80-µA Max ICC Typical tpd = 12 ns ±6-mA Output Drive at 5 V


    Original
    PDF SN54HCT646, SN74HCT646 SCLS178C SN54HCT646 SN74HCT646

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS178C – MARCH 1984 – REVISED MARCH 2003 D D D D Operating Voltage Range of 4.5 V to 5.5 V Low Power Consumption, 80-µA Max ICC Typical tpd = 12 ns ±6-mA Output Drive at 5 V


    Original
    PDF SN54HCT646, SN74HCT646 SCLS178C SN54HCT646 SN74HCT646 14struments

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS178C – MARCH 1984 – REVISED MARCH 2003 D D D D Operating Voltage Range of 4.5 V to 5.5 V Low Power Consumption, 80-µA Max ICC Typical tpd = 12 ns ±6-mA Output Drive at 5 V


    Original
    PDF SN54HCT646, SN74HCT646 SCLS178C SN54HCT646 SN74HCT646 14pplication

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS _ SCLS178A-MARCH 1984- HEVISED JANUARY 1996 Inputs Are TTL-Voltage Compatible Independent Registers for A and B Buses Multiplexed Real-Time and Stored Data True Data Paths


    OCR Scan
    PDF SN54HCT646, SN74HCT646 SCLS178A-MARCH 300-mll

    SN74HCT

    Abstract: No abstract text available
    Text: TE XAS I N S T R LOGIC ESE B • 6 ibi723 Q06b^D4 Q ■ SN54HCT646, SN54HCT648, SN74HCT646, SN74HCT648 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS □ 2 8 04 , M A R C H 1 9 8 4 -B E V IS E 0 SEPTEMBER 1987 SN54HCT'. . . J T PACKAGE SN74HCT'. . . OW OR NT PACKAGE


    OCR Scan
    PDF ibi723 SN54HCT646, SN54HCT648, SN74HCT646, SN74HCT648 300-mil SN54HCT' SN74HCT' SN54HCT646 SN74HCT646 SN74HCT

    8713B

    Abstract: T648 B1193 T646
    Text: SN54HCT646. SN54HCT648, SN74HCT646, SN74HCT648 OC TAL BUS TRAN SC EIVERS AN D REGISTERS WITH 3 S TA TE OUTPUTS D 2 8 0 4 , M AR C H 1 9 8 4 -R E V IS E D SEPTEMBER 1 9 8 7 • Inputs are TTL-Voltage Compatible • Independent Registers lor A and B Buses •


    OCR Scan
    PDF SN54HCT646. SN54HCT648, SN74HCT646, SN74HCT648 300-mil SN54H 8713B T648 B1193 T646

    SN54HCT646

    Abstract: SN74HCT646
    Text: This Material Copyrighted By Its Respective Manufacturer SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS S C L S 1 7 8 A - MARCH 1984 - REVISED JA N U A R Y 1996 I I I I I I-1 I < co D m I J L T r I I CD /> D CD I I I


    OCR Scan
    PDF SN54HCT646, SN74HCT646 SCLS178A- SN54HCT646 SN74HCT646

    T646

    Abstract: No abstract text available
    Text: SN54HCT646, SN54HCT648. SN74HCT646, SN74HCT648 OCTAL BUS TRANSCEIVERS AN D REGISTERS WITH 3 S T A T E OUTPUTS D 2 8 0 4 , M AR C H 1 9 8 4 -R E V IS E O SEPTEMBER 1 9 8 7 SNG4HCT' . . . JT PACKAGE SN74HCT&#39; . . . OW OR NT PACKAGE Inputs are TTL-Voltage Compatible


    OCR Scan
    PDF SN54HCT646, SN54HCT648. SN74HCT646, SN74HCT648 300-mil T646

    HCT646

    Abstract: HCT648 SN54HCT646 SN74HCT646 SN54HCT648 1BAI AL4A
    Text: SN54HCT646, SNS4HCT648, SN74HCT646, SN74HCT648 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS □ 2 8 0 4 , M ARCH 1 9 8 4 -R E V IS E D SEPTEMBER 1 9 8 7 S N 5 4 H C T ' . . . J T PACKAGE S N 7 4 H C T ' . . . D W OR N T PACKAGE • Inputs are TTL-Voltage Compatible


    OCR Scan
    PDF SN54HCT646, SNS4HCT648, SN74HCT646, SN74HCT648 300-mil SN54HCT646 SN54HCT648 SN74HCT646 HCT646 HCT648 1BAI AL4A

    PC74HC04

    Abstract: PC74HC154 PC74HC191 PC74HCT541 PC74HCT245 MC74HC266 PC74HC374 PC74HCT244 PC74HCT86 PC74HC273
    Text: CROSS REFERENCE TABLE TOSHIBA TC74HC00A MOTOROLA MC74HC00 T1 SN74HCOO TC74HCT00A TC74HC02A MC74HC02 SN74HC02 TC74HCT02A HARRIS S1GNET1CS NATIONAL Ì SEMICONDUCTOR CD74HC00 PC74HCOO MM74HC00 CD74HCT00 PC74HCTOO MM74HCTOO MM74HC02 CD74IIC02 PC74HC02 CD74HCT02


    OCR Scan
    PDF TC74HC00A TC74HCT00A TC74HC02A TC74HCT02A TC74HC03A TC74HC04A TC74HCU04A TC74HCT04A TC74HC05A TC74HC07A PC74HC04 PC74HC154 PC74HC191 PC74HCT541 PC74HCT245 MC74HC266 PC74HC374 PC74HCT244 PC74HCT86 PC74HC273