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

    74AC08SC Search Results

    SF Impression Pixel

    74AC08SC Price and Stock

    onsemi 74AC08SCX

    IC GATE AND 4CH 2-INP 14SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey 74AC08SCX Cut Tape 5,397 1
    • 1 $1.03
    • 10 $0.624
    • 100 $0.3973
    • 1000 $0.27122
    • 10000 $0.27122
    		Buy Now
    74AC08SCX Digi-Reel 5,397 1
    • 1 $1.03
    • 10 $0.624
    • 100 $0.3973
    • 1000 $0.27122
    • 10000 $0.27122
    		Buy Now
    74AC08SCX Reel 2,500 2,500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.23836
    		Buy Now
    Avnet Americas 74AC08SCX Reel 12 Weeks 7,500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.17004
    		Buy Now
    74AC08SCX Reel 12 Weeks 7,500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.1409
    		Buy Now
    74AC08SCX Reel 7,500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.1409
    		Buy Now
    Mouser Electronics 74AC08SCX 10,323
    • 1 $0.62
    • 10 $0.468
    • 100 $0.312
    • 1000 $0.24
    • 10000 $0.2
    		Buy Now
    Verical 74AC08SCX 1,871 1,694
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.2214
    		Buy Now
    74AC08SCX 1,517 35
    • 1 -
    • 10 -
    • 100 $0.2737
    • 1000 $0.1718
    • 10000 $0.1718
    		Buy Now
    Arrow Electronics 74AC08SCX 2,500 12 Weeks 2,500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.1813
    		Buy Now
    74AC08SCX Cut Strips 1,517 12 Weeks 1
    • 1 $0.6646
    • 10 $0.4443
    • 100 $0.2737
    • 1000 $0.1718
    • 10000 $0.1718
    		Buy Now
    Newark 74AC08SCX Cut Tape 1,232 1
    • 1 $0.541
    • 10 $0.452
    • 100 $0.303
    • 1000 $0.218
    • 10000 $0.218
    		Buy Now
    74AC08SCX Reel 2,500
    • 1 $0.258
    • 10 $0.258
    • 100 $0.258
    • 1000 $0.258
    • 10000 $0.233
    		Buy Now
    Onlinecomponents.com 74AC08SCX
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.187
    		Buy Now
    Rochester Electronics 74AC08SCX 1,871 1
    • 1 $0.2083
    • 10 $0.2083
    • 100 $0.1958
    • 1000 $0.1771
    • 10000 $0.1771
    		Buy Now
    TME 74AC08SCX 1
    • 1 $0.551
    • 10 $0.408
    • 100 $0.27
    • 1000 $0.2
    • 10000 $0.195
    		Get Quote
    Avnet Silica 74AC08SCX 2,500 13 Weeks 2,500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    		Buy Now
    New Advantage Corporation 74AC08SCX 2,500 1
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.2765
    		Buy Now

    onsemi 74AC08SC

    IC GATE AND 4CH 2-INP 14SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey 74AC08SC Tube
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    		Buy Now
    Avnet Americas 74AC08SC Tube 169 1,430
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    		Get Quote
    Verical 74AC08SC 32,010 1,519
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.2469
    		Buy Now
    Rochester Electronics 74AC08SC 32,150 1
    • 1 $0.2324
    • 10 $0.2324
    • 100 $0.2185
    • 1000 $0.1975
    • 10000 $0.1975
    		Buy Now
    Flip Electronics 74AC08SC 1,265
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    		Get Quote

    Rochester Electronics LLC 74AC08SCX

    IC GATE AND 4CH 2-INP 14SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey 74AC08SCX Bulk 1,385
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.22
    		Buy Now

    Aptina Imaging 74AC08SCX

    AND Gate 4-Element 2-IN CMOS 14-Pin SOIC N T/R
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Verical 74AC08SCX 2,500 2,500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.2275
    		Buy Now

    National Semiconductor Corporation 74AC08SCX

    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Bristol Electronics 74AC08SCX 10,474 9
    • 1 -
    • 10 $0.6
    • 100 $0.3
    • 1000 $0.12
    • 10000 $0.081
    		Buy Now
    74AC08SCX 1,949
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    		Get Quote
    74AC08SCX 550 9
    • 1 -
    • 10 $0.6
    • 100 $0.3
    • 1000 $0.18
    • 10000 $0.18
    		Buy Now
    Quest Components 74AC08SCX 1,980
    • 1 $0.8
    • 10 $0.8
    • 100 $0.24
    • 1000 $0.16
    • 10000 $0.16
    		Buy Now
    74AC08SCX 790
    • 1 $0.168
    • 10 $0.168
    • 100 $0.112
    • 1000 $0.0896
    • 10000 $0.0896
    		Buy Now
    Find more 74AC08SC price and stock on Findchips.com

    74AC08SC Datasheets (11)

    Part ECAD Model Manufacturer Description Curated Datasheet Type PDF
    74AC08SC Fairchild Semiconductor IC AND GATE QUAD 2IN CMOS 14SOIC RAIL Original PDF
    74AC08SC Fairchild Semiconductor Quad 2-Input AND Gate Original PDF
    74AC08SC Fairchild Semiconductor Quad 2-Input AND Gate; Package: SOIC; No of Pins: 14; Container: Rail Original PDF
    74AC08SC National Semiconductor Quad 2-Input AND Gate Original PDF
    74AC08SC Unknown Historical semiconductor price guide (US$ - 1998). From our catalog scanning project. Historical PDF
    74AC08SC_NL Fairchild Semiconductor Quad 2-Input AND Gate Original PDF
    74AC08SCQR National Semiconductor Quad 2-Input AND Gate Original PDF
    74AC08SCX Fairchild Semiconductor IC AND GATE QUAD 2IN CMOS 14SOIC T/R Original PDF
    74AC08SCX Fairchild Semiconductor Quad 2-Input AND Gate Original PDF
    74AC08SCX Fairchild Semiconductor Quad 2-Input AND Gate; Package: SOIC; No of Pins: 14; Container: Tape & Reel Original PDF
    74AC08SCX_NL Fairchild Semiconductor Quad 2-Input AND Gate Original PDF

    74AC08SC Datasheets Context Search

    Catalog Datasheet MFG & Type Document Tags PDF

    74ACT08

    Abstract: No abstract text available
    Text: 74AC08, 74ACT08 Quad 2-Input AND Gate Features General Description • ICC reduced by 50% on 74AC only The AC08/ACT08 contains four, 2-input AND gates. ■ Outputs source/sink 24mA Ordering Information Order Number Package Number Package Description 74AC08SC


    Original     		74AC08, 74ACT08 AC08/ACT08 74AC08SC 14-Lead MS-012, 74AC08SJ 74AC08MTC MTC14 74ACT08 PDF

    sop65p640

    Abstract: SOP65 Fairchild 74act08 1.50 MKT 74AC 74AC08 74AC08MTC 74AC08PC 74AC08SC 74AC08SJ
    Text: 74AC08, 74ACT08 Quad 2-Input AND Gate Features General Description • ICC reduced by 50% on 74AC only The AC08/ACT08 contains four, 2-input AND gates. ■ Outputs source/sink 24mA Ordering Information Order Number Package Number Package Description 74AC08SC


    Original     		74AC08, 74ACT08 AC08/ACT08 74AC08SC 14-Lead MS-012, 74AC08SJ 74AC08MTC MTC14 sop65p640 SOP65 Fairchild 74act08 1.50 MKT 74AC 74AC08 74AC08MTC 74AC08PC 74AC08SC 74AC08SJ 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

    74AC

    Abstract: 74AC08 74AC08MTC 74AC08PC 74AC08SC 74AC08SJ 74ACT08 74ACT08MTC 74ACT08SC
    Text: Revised October 1998 74AC08 • 74ACT08 Quad 2-Input AND Gate General Description Features The AC/ACT08 contains four, 2-input AND gates. • ICC reduced by 50% on 74AC only ■ Outputs source/sink 24 mA Ordering Code: Order Number Package Number Package Description


    Original     		74AC08 74ACT08 AC/ACT08 74ACT08SC 14-Lead MS-120, 74AC08SC MS-013, 74AC08SJ 74AC 74AC08 74AC08MTC 74AC08PC 74AC08SC 74AC08SJ 74ACT08 74ACT08MTC 74ACT08SC 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

    Arduino Mega2560

    Abstract: 13001 S 6D TRANSISTOR arduino uno rev 3 agilent optical encoder 9988 MZ 13001 TRANSISTOR arduino mega 2650 skiip 613 gb 123 ct arduino sound sensor module pic arduino nano mc34063l
    Text: ND3% BASE1 XXXX2108-0010-1-P 10 TSQ: 3001 CMS: CMS-USM TS host OP: NN COMP: 15-07-11 Hour: 13:07 TS:TS date TS time MCUS, MPUS, DSPS & DEVELOPMENT TOOLS Find Datasheets Online 8-BIT MCUS & DEVELOPMENT TOOLS 1 PSoC 3 DEVELOPMENT KITS ARDUINO MCU DEVLOPMENT PLATFORM


    Original     		CY8C38 CY8C29 incl795 12T9797 12T9804 12T9803 12T9800 12T9802 12T9801 12T9805 Arduino Mega2560 13001 S 6D TRANSISTOR arduino uno rev 3 agilent optical encoder 9988 MZ 13001 TRANSISTOR arduino mega 2650 skiip 613 gb 123 ct arduino sound sensor module pic arduino nano mc34063l 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

    74AC08

    Abstract: 74AC 74AC08MTC 74AC08MTCX 74AC08PC 74AC08SC 74AC08SJ 74ACT08 74ACT08SC N-14A
    Text: Revised February 2005 74AC08 • 74ACT08 Quad 2-Input AND Gate General Description Features The AC/ACT08 contains four, 2-input AND gates. • ICC reduced by 50% on 74AC only ■ Outputs source/sink 24 mA Ordering Code: Order Number Package Package Description


    Original     		74AC08 74ACT08 AC/ACT08 74AC08SC 14-Lead MS-012, 74AC08SJ 74AC08MTC MTC14 74AC08 74AC 74AC08MTC 74AC08MTCX 74AC08PC 74AC08SC 74AC08SJ 74ACT08 74ACT08SC N-14A PDF

    hc04m

    Abstract: 4 volt regulator BY 235 panasonic inverter manual J16B j6a analog devices AN80004 EB800 VHC541 HP8644
    Text: AN8000 EVALUATION BOARD APPLICATION NOTE NOVEMBER 12, 2001 FEATURES APPLICATIONS • • • • • • • • • • • 14-bit resolution Up to 20 MSPS conversion rate On-board clock driver On-board Reset/Cal circuit Internal/external reference option


    Original     		AN8000 14-bit SPT8000 44-lead EB8000 hc04m 4 volt regulator BY 235 panasonic inverter manual J16B j6a analog devices AN80004 EB800 VHC541 HP8644 PDF

    74ls74apc

    Abstract: HD74ls04p 74LVC1G04ady8 semiconductor AZ431BZ-AE1 HCF4060BE HEF4093BP datasheet free download ne5334 hd74hc132p dm74ls47n
    Text: Standard Linear and Logic Products Cross-Reference Introduction Notice This Standard Linear and Logic Products CrossReference will assist in finding a device made by Texas Instruments that is a drop-in or similar replacement to many of our competitors’ standard linear and logic products.


    Original     		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

    4 volt regulator

    Abstract: hc04m panasonic inverter manual 74hc04m BY 235 AC08 AN8000 HC04 HP8644 SPT8000
    Text: AN8000 EVALUATION BOARD APPLICATION NOTE NOVEMBER 12, 2001 FEATURES APPLICATIONS • • • • • • • • • • • 14-bit resolution Up to 20 MSPS conversion rate On-board clock driver On-board Reset/Cal circuit Internal/external reference option


    Original     		AN8000 14-bit SPT8000 44-lead EB8000 4 volt regulator hc04m panasonic inverter manual 74hc04m BY 235 AC08 AN8000 HC04 HP8644 PDF

    ACT08

    Abstract: 54ACT08 54ACTQ08 74AC08PC 74AC08SC 74AC08SJ 74ACT08 AC08 54AC08DM 74ACT08SC
    Text: General Description Features The ’AC/’ACT08 contains four, 2-input AND gates. n n n n Ordering Code: ICC reduced by 50% on 54AC/74AC only Outputs source/sink 24 mA ’ACT08 has TTL-compatible inputs Standard Military Drawing SMD — ’AC08: 5962-87615


    Original     		ACT08 54AC/74AC 54ACT08 54ACTQ08 74AC08PC 74AC08SC 74AC08SJ 74AC08MTC MTC14 54ACTQ08 74AC08PC 74AC08SC 74AC08SJ 74ACT08 AC08 54AC08DM 74ACT08SC PDF

    74AC

    Abstract: 74AC08 74AC08MTC 74AC08PC 74AC08SC 74AC08SJ 74ACT08 74ACT08MTC 74ACT08SC
    Text: Revised November 1999 74AC08 • 74ACT08 Quad 2-Input AND Gate General Description Features The AC/ACT08 contains four, 2-input AND gates. • ICC reduced by 50% on 74AC only ■ Outputs source/sink 24 mA Ordering Code: Order Number Package Number Package Description


    Original     		74AC08 74ACT08 AC/ACT08 14-Lead MS-120, 74AC08SC 74AC08SJ 74AC08MTC 74AC08PC 74AC 74AC08 74AC08MTC 74AC08PC 74AC08SC 74AC08SJ 74ACT08 74ACT08MTC 74ACT08SC PDF

    220v AC voltage stabilizer schematic diagram

    Abstract: BA 49182 RJh 3047 rjh 3047 equivalent a1458 opto philips ecg master replacement guide MOSFET, rjh 3077 sc1097 philips ecg semiconductors master replacement guide Electronic ballast 40W using 13005 transistor
    Text: QUICK INDEX NEW IN THIS ISSUE! Detailed Index - See Pages 2-6 Fiber Optic Connectors and Accessories . . . . . . . . . . . See Page 121 Connectors, Cable Assemblies, IC Sockets . . . . . . . . . . . 10-122 Fiber Optic Cable, Connectors, and Accessories . . . . . . See Pages 118-122


    Original     		P390-ND P465-ND P466-ND P467-ND LNG901CF9 LNG992CFBW LNG901CFBW LNG91LCFBW 220v AC voltage stabilizer schematic diagram BA 49182 RJh 3047 rjh 3047 equivalent a1458 opto philips ecg master replacement guide MOSFET, rjh 3077 sc1097 philips ecg semiconductors master replacement guide Electronic ballast 40W using 13005 transistor PDF

    panasonic inverter manual

    Abstract: ECST0JZ106R HP8644A OP291GS AN8120 AD8009 AD8138 FAN2508S33 HP8644 inverter schematic
    Text: www.fairchildsemi.com AN8120 Evaluating the SPT8120 Using Evaluation Board EB8120 Features Description • • • • • • The SPT8120 is a 16-bit, 20 MSPS analog-to-digital converter. It provides outstanding dynamic performance with very low power dissipation and operates with a single +5V supply.


    Original     		AN8120 SPT8120 EB8120 16-bit, 64-pin 16-bit panasonic inverter manual ECST0JZ106R HP8644A OP291GS AN8120 AD8009 AD8138 FAN2508S33 HP8644 inverter schematic PDF

    octal Bilateral Switches

    Abstract: MM74HC14M MM74HC138M CD4025BCM MM74HC00M MM74HC74AM MM74HC125M MM74HC04M cd4046bcm cd4052bcm
    Text: 1/3 CMOS LOGIC MM74HC SERIES MM74HCT/U SERIES • HIGH SPEED CMOS TECHNOLOGY, CMOS DRIVE LEVELS, SPEED COMPARABLE TO 74LS SERIES Part Number Description • HIGH SPEED CMOS TECHNOLOGY, TTL DRIVE LEVELS, SPEED COMPARABLE TO 74LS SERIES SQP £ ea. Gates & Inverters


    Original     		MM74HC MM74HC00M MM74HC02M MM74HC04M MM74HC08M MM74HC14M MM74HC32M MM74HC86M MM74HC132M MM74HC74AM octal Bilateral Switches MM74HC138M CD4025BCM MM74HC125M cd4046bcm cd4052bcm PDF

    5555 FAIRCHILD optocoupler

    Abstract: DM74LS75N MC74HC373DW 74hc14n equivalent HCF4060BE 40373 NC7S125M5X datasheet 14543 motorola 14049 CD40106BE
    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 DM74LS75N MC74HC373DW 74hc14n equivalent HCF4060BE 40373 NC7S125M5X datasheet 14543 motorola 14049 CD40106BE PDF

    Untitled

    Abstract: No abstract text available
    Text: Revised October 1998 j,f > i '' ^ : 3? •? » 74AC08 • 74ACT08 Quad 2-Input AND Gate General Description Features The AC/ACT08 contains four, 2-input AND gates. ■ lc c reduced by 50% on 74AC only ■ Outputs source/sink 24 mA Ordering Code: Order Number


    OCR Scan     		74AC08 74ACT08 AC/ACT08 74ACT08SC 14-Lead MS-120, 74AC08SC MS-013, 74AC08SJ PDF

    equivalent data book of 10N60 mosfet

    Abstract: MC14016CP GD4511 an-6466 CX 2859 SMD 74AC14 spice 6120* harris HCF4018be 7028 SMD Transistor spice irfbc40
    Text: $5.00 S E M I C O N D U C T O R TECHNICAL ASSISTANCE Harris Marketing Support Services HMSS , 1-800-4HARRIS HMSS provides world-class service to customers requiring information on all products offered by Harris Semiconductor. Ask Harris Marketing Support Services for answers concerning:


    OCR Scan     		1-800-4HARRIS equivalent data book of 10N60 mosfet MC14016CP GD4511 an-6466 CX 2859 SMD 74AC14 spice 6120* harris HCF4018be 7028 SMD Transistor spice irfbc40 PDF