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

    SN74HCT Search Results

    SN74HCT Result Highlights (5)

    Part ECAD Model Manufacturer Description Download Buy
    SN74HCT00DR Texas Instruments Quadruple 2-Input Positive-NAND Gates 14-SOIC -40 to 85 Visit Texas Instruments Buy
    SN74HCT02N Texas Instruments Quadruple 2-Input Positive-NOR Gates 14-PDIP -40 to 85 Visit Texas Instruments Buy
    SN74HCT08NSR Texas Instruments Quadruple 2-Input Positive-AND Gates 14-SO -40 to 85 Visit Texas Instruments Buy
    SN74HCT138DR Texas Instruments 3-Line To 8-Line Decoders/Demultiplexers 16-SOIC -40 to 85 Visit Texas Instruments Buy
    SN74HCT14N Texas Instruments Hex Schmitt-Trigger Inverters 14-PDIP -40 to 85 Visit Texas Instruments Buy
    SF Impression Pixel

    SN74HCT Price and Stock

    Texas Instruments SN74HCT139DR

    IC DECODER/DEMUX 1X2:4 16SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74HCT139DR Cut Tape 10,384 1
    • 1 $0.34
    • 10 $0.233
    • 100 $0.1786
    • 1000 $0.14988
    • 10000 $0.14988
    		Buy Now
    SN74HCT139DR Digi-Reel 10,384 1
    • 1 $0.34
    • 10 $0.233
    • 100 $0.1786
    • 1000 $0.14988
    • 10000 $0.14988
    		Buy Now
    SN74HCT139DR Reel 2,500 2,500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.14272
    		Buy Now
    Bristol Electronics SN74HCT139DR 5,434
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    		Get Quote
    Rochester Electronics SN74HCT139DR 25,000 1
    • 1 $0.1278
    • 10 $0.1278
    • 100 $0.1201
    • 1000 $0.1086
    • 10000 $0.1086
    		Buy Now
    ComSIT USA SN74HCT139DR 1,261
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    		Get Quote
    Win Source Electronics SN74HCT139DR 29,930
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.1172
    • 10000 $0.0952
    		Buy Now

    Texas Instruments SN74HCT165PWR

    8-BIT PARALLEL-IN/SERIAL-OUT SHI
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74HCT165PWR Digi-Reel 9,308 1
    • 1 $0.63
    • 10 $0.449
    • 100 $0.3513
    • 1000 $0.30019
    • 10000 $0.30019
    		Buy Now
    SN74HCT165PWR Cut Tape 9,308 1
    • 1 $0.63
    • 10 $0.449
    • 100 $0.3513
    • 1000 $0.30019
    • 10000 $0.30019
    		Buy Now
    SN74HCT165PWR Reel 6,000 2,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.25
    		Buy Now
    Mouser Electronics SN74HCT165PWR 3,681
    • 1 $0.57
    • 10 $0.35
    • 100 $0.285
    • 1000 $0.273
    • 10000 $0.25
    		Buy Now

    Texas Instruments SN74HCT14DBR

    IC INVERT SCHMITT 6CH 1IN 14SSOP
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74HCT14DBR Cut Tape 6,180 1
    • 1 $0.33
    • 10 $0.231
    • 100 $0.1769
    • 1000 $0.14843
    • 10000 $0.14843
    		Buy Now
    SN74HCT14DBR Digi-Reel 6,180 1
    • 1 $0.33
    • 10 $0.231
    • 100 $0.1769
    • 1000 $0.14843
    • 10000 $0.14843
    		Buy Now
    SN74HCT14DBR Reel 4,000 2,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.13352
    		Buy Now
    Rochester Electronics SN74HCT14DBR 16,523 1
    • 1 $0.1292
    • 10 $0.1292
    • 100 $0.1214
    • 1000 $0.1098
    • 10000 $0.1098
    		Buy Now

    Texas Instruments SN74HCT244QPWRG4Q1

    IC BUF NON-INVERT 5.5V 20TSSOP
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74HCT244QPWRG4Q1 Cut Tape 1,773 1
    • 1 $0.75
    • 10 $0.532
    • 100 $0.4186
    • 1000 $0.35922
    • 10000 $0.35922
    		Buy Now
    SN74HCT244QPWRG4Q1 Digi-Reel 1,773 1
    • 1 $0.75
    • 10 $0.532
    • 100 $0.4186
    • 1000 $0.35922
    • 10000 $0.35922
    		Buy Now
    Rochester Electronics SN74HCT244QPWRG4Q1 7,730 1
    • 1 $0.2514
    • 10 $0.2514
    • 100 $0.2363
    • 1000 $0.2137
    • 10000 $0.2137
    		Buy Now
    Chip 1 Exchange SN74HCT244QPWRG4Q1 4,630
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    		Get Quote
    New Advantage Corporation SN74HCT244QPWRG4Q1 2,842 1
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.632
    • 10000 $0.5899
    		Buy Now

    Texas Instruments SN74HCT541PWT

    IC BUF NON-INVERT 5.5V 20TSSOP
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74HCT541PWT Cut Tape 936 1
    • 1 $1.12
    • 10 $0.807
    • 100 $0.6443
    • 1000 $0.6443
    • 10000 $0.6443
    		Buy Now
    SN74HCT541PWT Digi-Reel 936 1
    • 1 $1.12
    • 10 $0.807
    • 100 $0.6443
    • 1000 $0.6443
    • 10000 $0.6443
    		Buy Now
    SN74HCT541PWT Reel 500 250
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.6036
    • 10000 $0.52096
    		Buy Now
    Rochester Electronics SN74HCT541PWT 250 1
    • 1 $0.5292
    • 10 $0.5292
    • 100 $0.4974
    • 1000 $0.4498
    • 10000 $0.4498
    		Buy Now
    Win Source Electronics SN74HCT541PWT 29,970
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.348
    • 10000 $0.348
    		Buy Now
    Find more SN74HCT price and stock on Findchips.com

    SN74HCT Datasheets (500)

    Part ECAD Model Manufacturer Description Curated Datasheet Type PDF
    SN74HCT00 Texas Instruments QUADRUPLE 2-INPUT POSITIVE-NAND GATES Original PDF
    SN74HCT00 Texas Instruments QUADRUPLE 2-INPUT POSITIVE-NAND GATES Original PDF
    SN74HCT00APWR Texas Instruments QUADRUPLE 2-INPUT POSITIVE-NAND GATES Original PDF
    SN74HCT00APWR Texas Instruments SN74HCT00 - IC HCT SERIES, QUAD 2-INPUT NAND GATE, PDSO14, PLASTIC, TSSOP-14, Gate Original PDF
    SN74HCT00APWRE4 Texas Instruments SN74HCT00 - IC HCT SERIES, QUAD 2-INPUT NAND GATE, PDSO14, PLASTIC, TSSOP-14, Gate Original PDF
    SN74HCT00D Texas Instruments Quadruple 2-Input Positive-NAND Gates 14-SOIC -40 to 85 Original PDF
    SN74HCT00D Texas Instruments Quadruple 2-Input Positive-NAND Gates Original PDF
    SN74HCT00D Texas Instruments QUADRUPLE 2-INPUT POSITIVE-NAND GATES Original PDF
    SN74HCT00D Texas Instruments Logic - Gates and Inverters, Integrated Circuits (ICs), IC GATE NAND 4CH 2-INP 14-SOIC Original PDF
    SN74HCT00D Texas Instruments SN74HCT00 - Quadruple 2-Input Positive-NAND Gates 14-SOIC -40 to 85 Original PDF
    SN74HCT00D Unknown Historical semiconductor price guide (US$ - 1998). From our catalog scanning project. Historical PDF
    SN74HCT00D Texas Instruments QUADRUPLE 2-INPUT POSITIVE-NAND GATES Scan PDF
    SN74HCT00D-00 Texas Instruments SN74HCT00 - IC HCT SERIES, QUAD 2-INPUT NAND GATE, PDSO14, Gate Original PDF
    SN74HCT00DBR Texas Instruments Quadruple 2-Input Positive-NAND Gates 14-SSOP -40 to 85 Original PDF
    SN74HCT00DBR Texas Instruments Quadruple 2-Input Positive-NAND Gates Original PDF
    SN74HCT00DBR Texas Instruments Logic - Gates and Inverters, Integrated Circuits (ICs), IC GATE NAND 4CH 2-INP 14-SSOP Original PDF
    SN74HCT00DBR Texas Instruments SN74HCT00 - Quadruple 2-Input Positive-NAND Gates 14-SSOP -40 to 85 Original PDF
    SN74HCT00DBRE4 Texas Instruments Quadruple 2-Input Positive-NAND Gates 14-SSOP -40 to 85 Original PDF
    SN74HCT00DBRE4 Texas Instruments Logic - Gates and Inverters, Integrated Circuits (ICs), IC GATE NAND 4CH 2-INP 14-SSOP Original PDF
    SN74HCT00DBRE4 Texas Instruments SN74HCT00 - Quadruple 2-Input Positive-NAND Gates 14-SSOP -40 to 85 Original PDF
    ...

    SN74HCT Datasheets Context Search

    Catalog Datasheet MFG & Type PDF Document Tags

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT245, SN74HCT245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCLS020C – MARCH 1984 – REVISED MAY 1997 D D D SN54HCT245 . . . J OR W PACKAGE SN74HCT245 . . . DB, DW, N, OR PW PACKAGE TOP VIEW Inputs Are TTL-Voltage Compatible High-Current 3-State Outputs Drive Bus


    Original     		PDF SN54HCT245, SN74HCT245 SCLS020C 300-mil SN54HCT245 SN74HCT245 SN74HCT245DBLE SN74HCT245DBR SN74HCT245DW SN74HCT245DWR

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT374, SN74HCT374 OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS WITH 3-STATE OUTPUTS SCLS005B – MARCH 1984 – REVISED MAY 1997 D D D D D SN54HCT374 . . . J OR W PACKAGE SN74HCT374 . . . DW OR N PACKAGE TOP VIEW Inputs Are TTL-Voltage Compatible Eight D-Type Flip-Flops in a Single Package


    Original     		PDF SN54HCT374, SN74HCT374 SCLS005B 300-mil SN54HCT374 SN74HCT374 SCBA004C SN54/74HCT SCLA011 SCLA008

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT240, SN74HCT240 OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS SCLS174C – MARCH 1984 – REVISED FEBRUARY 2000 D D SN54HCT240 . . . J OR W PACKAGE SN74HCT240 . . . DW, N, OR PW PACKAGE TOP VIEW Inputs Are TTL-Voltage Compatible 3-State Outputs Drive Bus Lines or Buffer


    Original     		PDF SN54HCT240, SN74HCT240 SCLS174C SN54HCT240 SN74HCT240 SCAU001A, JM38510/65753BRA SN54HCT240J SNJ54HCT240FK 5505012A

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT257, SN74HCT257 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SCLS072B – NOVEMBER 1988 – REVISED MAY 1997 D D D D D SN54HCT257 . . . J PACKAGE SN74HCT257 . . . N PACKAGE TOP VIEW Inputs Are TTL-Voltage Compatible


    Original     		PDF SN54HCT257, SN74HCT257 SCLS072B 300-mil SN54HCT257 SN74HCT257 HCT257 SCET004, SCAU001A, 0000914/08302000/TXII/08302000/sn74hct257

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT138, SN74HCT138 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS SCLS171C – MARCH 1984 – REVISED MAY 1997 D SN54HCT138 . . . J OR W PACKAGE SN74HCT138 . . . D, N, OR PW PACKAGE TOP VIEW A B C G2A G2B G1 Y7 GND 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC


    Original     		PDF SN54HCT138, SN74HCT138 SCLS171C 300-mil SN54HCT138 SN74HCT138 HCT138 SCBA004C SN54/74HCT SCLA011

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT244, SN74HCT244 OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS SCLS175B – MARCH 1984 – REVISED MAY 1997 D D SN54HCT244 . . . J OR W PACKAGE SN74HCT244 . . . DB, DW, N, OR PW PACKAGE TOP VIEW Inputs Are TTL-Voltage Compatible 3-State Outputs Drive Bus Lines or Buffer


    Original     		PDF SN54HCT244, SN74HCT244 SCLS175B 300-mil SN54HCT244 SN74HCT244 5130012A JM38510/65755B2A JM38510/65755BRA SN54HCT244J

    Untitled

    Abstract: No abstract text available
    Text: SN74HCT04ĆEP HEX INVERTER SCLS561 − JANUARY 2004 D Controlled Baseline D D D D D − One Assembly/Test Site, One Fabrication Site Enhanced Diminishing Manufacturing Sources DMS Support Enhanced Product-Change Notification Qualification Pedigree† Operating Voltage Range of 4.5 V to 5.5 V


    Original     		PDF SN74HCT04EP SCLS561

    ht245

    Abstract: No abstract text available
    Text: SN54HCT245, SN74HCT245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCLS020E – MARCH 1984 – REVISED AUGUST 2003 D D D D D D D Operating Voltage Range of 4.5 V to 5.5 V High-Current 3-State Outputs Drive Bus Lines Directly or Up To 15 LSTTL Loads Low Power Consumption, 80-µA Max ICC


    Original     		PDF SN54HCT245, SN74HCT245 SCLS020E SN54HCT245 SN74HCT245 HCT245 ht245

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT540, SN74HCT540 OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS SCLS008C – MARCH 1984 – REVISED MARCH 2003 D D D D 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 SN54HCT540, SN74HCT540 SCLS008C SN54HCT540 SN74HCT540

    IC SN74HC

    Abstract: SN74HCTOO SN74HC
    Text: SN54HCT00, SN74HCT00 QUADRUPLE 2-INPUT POSITIVE NANO GATES D 3 2 4 3 , NOVEMBER 1968 Inputs are TTL-Voftage Compatible S N 54H C T00 S N 74H C T00 Package Options Include Plastic "Small Outline" Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil


    OCR Scan     		PDF SN54HCT00, SN74HCT00 300-mil 74Herating SN54HC SN74HC IC SN74HC SN74HCTOO

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT534, SN74HCT534 OCTAL D TYPE EDGE TRIGGERED FLIP FLOPS WITH 3-STATE OUTPUTS D 2 8 0 4 , M A R CH 1 9 8 4 - R E V IS E D S EP T EM B ER 1 987 • Inputs are TTL-Voltage Compatible • High-Current 3-State Inverting Outputs Can Drive Up to 15 LSTTL Loads


    OCR Scan     		PDF SN54HCT534, SN74HCT534 300-Mil

    SN64HC

    Abstract: No abstract text available
    Text: SNS4HCT651, SN54HCT652. SN74HCT651. SN74HCT652 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS D2B04, MARCH 19B4-REVISED SEPTEMBER 1987 Inputs are TTL-Voltage Compatible S N 6 4 H C T 6 6 1 , S N 6 4 H C T 6 6 2 . . . J T PACKAGE S N 7 4 H C T 6 6 1 . S N 7 4 H C T 6 6 2 . . . O W OR N T PACKAGE


    OCR Scan     		PDF SNS4HCT651, SN54HCT652. SN74HCT651. SN74HCT652 D2B04, 19B4-REVISED 300-mil SN64HC

    821A4

    Abstract: No abstract text available
    Text: SN54HCT242, SN54HCT243 SN74HCT242, SN74HCT243 QUADRUPLE BUS TRANSCEIVERS WITH 3 STATE OUTPUTS D 2 8 0 4 . M AR C H 1 9 8 4 - Inputs are TTL-Voltage Compatible • 2-W ay Asynchronous Communication Between Data Buses TO P V IE W ] G1 C 1 L J l4 H V CC 13 2 G2


    OCR Scan     		PDF SN54HCT242, SN54HCT243 SN74HCT242, SN74HCT243 300-m 821A4

    CT674

    Abstract: 54HCT574
    Text: SN54HCT574, SN74HCT574 OCTAL D TYPE EDGE TRIGGERED FLIP FLOPS WITH 3 STATE OUTPUTS D 2804. M A R C H • Inputs are TTL-Voltage Compatible • High-Current 3-State Noninverting Outputs Drive Bus-Lines Directly or Up to 15 LSTTL Loads Bus-Structured Pinout


    OCR Scan     		PDF SN54HCT574, SN74HCT574 300-mil CT674 54HCT574

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT240, SN74HCT240 OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS SCLS174A - MARCH 1984 - REVISED JANUARY 1996 Inputs Are TTL-Voltage Compatible SN54HCT240. . . J OR W PACKAGE SN74HCT240 . . . DW OR N PACKAGE TOP VIEW 3-State Outputs Drive Bus Lines or Buffer


    OCR Scan     		PDF SN54HCT240, SN74HCT240 SCLS174A 300-mil SN54HCT240. SN74HCT240

    Ct533

    Abstract: No abstract text available
    Text: SN54HCTS33, SN74HCT533 OCTAL 0 TYPE TRANSPARENT LATCHES WITH 3-STATE OUTPUTS 0 2 8 0 4 , M AR C H 1 9 8 4 -R E V IS E D SEPTEMBER 1987 S N 5 4 H C T 5 3 3 . . . J P AC KAG E SN74H C T533 D W OR N P AC KA G E Inputs are TTL-Voltage Compatible 8 Latches in a Single Package


    OCR Scan     		PDF SN54HCTS33, SN74HCT533 300-mil SN74H Ct533

    SN54HCT240

    Abstract: 8S63
    Text: SN54HCT240, SN74HCT240 OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS _ SCLS174A - MARCH 1984 - REVISED JANUARY 1996 • Inputs Are TTL-Voltage Compatible • 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers • SN54HCT240 . . . J OR W PACKAGE


    OCR Scan     		PDF SN54HCT240, SN74HCT240 SCLS174A SN54HCT240 SN74HCT240 300-mil SN54HCT240 8S63

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT125, SN74HCT125 QUADRUPLE BUS BUFFER GATES WITH 3-STATE OUTPUTS SCLS069S- NOVEMBER 198« - REVISED MARCH 1996 • ■ I • • Inputs Are TTL-Voltage Compatible High-Current 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers I I •


    OCR Scan     		PDF SN54HCT125, SN74HCT125 SCLS069S- 300-mll SN54HCT125 SN74HCT125

    T573

    Abstract: IN3027
    Text: SN54HCT573, SN74HCT573 OCTAL D TYPE TRANSPARENT LATCHES WITH 3-STATE OUTPUTS D 2 8 0 4 , M AR C H 1 9B 4 —REVISED SEPTEMBER 1987 • Inputs are TTL Voltage Compatible • High-Current 3-State Output Drive Bus-Lines Directly or Up to 15 LSTTL Loads • Bus-Structured Pinout


    OCR Scan     		PDF SN54HCT573, SN74HCT573 300-m T573 IN3027

    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

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT137, SN74HCT137 3 LINE TO 8-LIME DECODERSfDEMULTIPLEXERS WITH ADDRESS LATCHES D 2 8 0 4 . M AR C H 1 9 8 4 -R E V IS E D JUNE 1 9 8 9 S N 5 4 H C T 1 3 7 . . . J P AC KA G E Inputs are TTL-Voltage Compatible S N 7 4 H C T 1 3 7 . . . N P AC KAG E •


    OCR Scan     		PDF SN54HCT137, SN74HCT137 300-mil

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT373, SN74HCT373 OCTAL TRANSPARENT D-TYPE LATCHES WITH 3-STATE OUTPUTS SCLS009A-MARCH 1 9 8 4 - REVISED JANUARY 1996 Inputs Are TTL-Voltage Compatible SN54HCT373 . . . J OR W PACKAGE SN74HCT373. . . DW OR N PACKAGE TOP VIEW Eight High-Current Latches In a Single


    OCR Scan     		PDF SN54HCT373, SN74HCT373 SCLS009A-MARCH 300-mil SN54HCT373 SN74HCT373.

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT237, SN74HCT237 3 LINE TO 8-LINE DECODERS/DEMULTIPLEXERS WITH ADDRESS LATCHES D 2 8 0 4 , M A R C H 1 9 8 4 - R E V I S E D JU N E 1 9 8 9 • Inputs are TTL-Voltage Compatible S N 5 4 H C T2 3 7 . . . J PA C KA G E SN 74H C T237 . . . N PACKAG E •


    OCR Scan     		PDF SN54HCT237, SN74HCT237 300-mil CT237

    Untitled

    Abstract: No abstract text available
    Text: SN54HCT245, SN74HCT245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCLS020B - MARCH 1984 - REVISED JULY 1996 Inputs Are TTL-Voltage Compatible SN54HCT245 . . . J OR W PACKAGE SN74HCT245 . . . DB, DW, N, OR PW PACKAGE TOP VIEW High-Current 3-State Outputs Drive Bus


    OCR Scan     		PDF SN54HCT245, SN74HCT245 SCLS020B 300-mil SN54HCT245 SN74HCT245 01DS2m