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

    C40D Search Results

    C40D Result Highlights (5)

    Part ECAD Model Manufacturer Description Download Buy
    10091767-H0C-40DLF
    Amphenol Communications Solutions XCede® High Speed Backplane Connectors, Left polarized header guide module with key. PDF
    10091767-R0C-40DLF
    Amphenol Communications Solutions XCede® High Speed Backplane Connectors, Right polarized guide header module with key. PDF
    10104997-A0C-40DLF
    Amphenol Communications Solutions XCede® High Speed Backplane Connectors, Left polarizing guide module with key feature. PDF
    10104997-F0C-40DLF
    Amphenol Communications Solutions XCede® High Speed Backplane Connectors, Left polarizing guide module with key feature. PDF
    10104997-P0C-40DLF
    Amphenol Communications Solutions XCede® High Speed Backplane Connectors, Right polarized guide header module with key. PDF

    C40D Datasheets (2)

    Part ECAD Model Manufacturer Description Datasheet Type PDF PDF Size Page count
    C40D
    Unknown Short Form Datasheet and Cross Reference Data Short Form PDF 171.25KB 1
    C40D
    Unknown Semiconductor Devices, Diode, and SCR Datasheet Catalog Scan PDF 79.64KB 1
    SF Impression Pixel

    C40D Price and Stock

    Hirose Electric Co Ltd

    Hirose Electric Co Ltd DF40C-40DP-0.4V(51)

    CONN PLUG 40POS SMD GOLD
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey DF40C-40DP-0.4V(51) Reel 20,000 5,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.49
    Buy Now
    Mouser Electronics DF40C-40DP-0.4V(51) 6,645
    • 1 $0.93
    • 10 $0.78
    • 100 $0.67
    • 1000 $0.53
    • 10000 $0.50
    Buy Now
    Bristol Electronics () DF40C-40DP-0.4V(51) 780
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    DF40C-40DP-0.4V(51) 692
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    TME DF40C-40DP-0.4V(51) 5,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.44
    Get Quote
    Avnet Abacus DF40C-40DP-0.4V(51) 14 Weeks 5,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Buy Now
    Chip One Stop DF40C-40DP-0.4V(51) Cut Tape 9,345 0 Weeks, 1 Days 5
    • 1 -
    • 10 $0.93
    • 100 $0.62
    • 1000 $0.49
    • 10000 $0.41
    Buy Now
    Chip Stock DF40C-40DP-0.4V(51) 87,500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    IBS Electronics DF40C-40DP-0.4V(51) 4,000 500
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.70
    • 10000 $0.66
    Buy Now
    Master Electronics DF40C-40DP-0.4V(51) 2,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.50
    • 10000 $0.47
    Buy Now
    New Advantage Corporation DF40C-40DP-0.4V(51) 10,000 1
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.77
    Buy Now
    Sager DF40C-40DP-0.4V(51) 5,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.65
    Buy Now

    Hirose Electric Co Ltd DF40C-40DS-0.4V(51)

    CONN RCPT 40POS SMD GOLD
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey DF40C-40DS-0.4V(51) Reel 15,000 5,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.45
    Buy Now
    Avnet Americas DF40C-40DS-0.4V(51) Reel 5,000 12 Weeks 5,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.53
    Buy Now
    Mouser Electronics DF40C-40DS-0.4V(51) 6,984
    • 1 $0.86
    • 10 $0.73
    • 100 $0.62
    • 1000 $0.48
    • 10000 $0.45
    Buy Now
    Bristol Electronics () DF40C-40DS-0.4V(51) 3,888
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    DF40C-40DS-0.4V(51) 85
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    TME DF40C-40DS-0.4V(51) 5,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.38
    Get Quote
    Avnet Abacus DF40C-40DS-0.4V(51) 5,000 14 Weeks 5,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Buy Now
    Chip One Stop DF40C-40DS-0.4V(51) Cut Tape 2,313 0 Weeks, 1 Days 5
    • 1 -
    • 10 $0.73
    • 100 $0.51
    • 1000 $0.36
    • 10000 $0.36
    Buy Now
    IBS Electronics DF40C-40DS-0.4V(51) 10,000 500
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.57
    • 10000 $0.56
    Buy Now
    Master Electronics DF40C-40DS-0.4V(51) 5,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.40
    • 10000 $0.40
    Buy Now
    New Advantage Corporation DF40C-40DS-0.4V(51) 10,000 1
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.44
    Buy Now
    Sager DF40C-40DS-0.4V(51) 5,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.42
    Buy Now

    Hirose Electric Co Ltd DF37NC-40DS-0.4V(51)

    CONN RCPT 40POS SMD GOLD
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey () DF37NC-40DS-0.4V(51) Digi-Reel 7,826 1
    • 1 $1.16
    • 10 $1.16
    • 100 $1.16
    • 1000 $1.16
    • 10000 $1.16
    Buy Now
    DF37NC-40DS-0.4V(51) Cut Tape 7,826 1
    • 1 $1.16
    • 10 $1.16
    • 100 $1.16
    • 1000 $1.16
    • 10000 $1.16
    Buy Now
    Avnet Americas DF37NC-40DS-0.4V(51) Reel 12 Weeks 8,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.71
    Buy Now
    Mouser Electronics DF37NC-40DS-0.4V(51) 4,686
    • 1 $1.16
    • 10 $1.06
    • 100 $0.95
    • 1000 $0.69
    • 10000 $0.54
    Buy Now
    Avnet Abacus DF37NC-40DS-0.4V(51) 14 Weeks 8,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Buy Now
    Sager DF37NC-40DS-0.4V(51) 8,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.83
    Buy Now

    Hirose Electric Co Ltd DF30RC-40DP-0.4V(81)

    CONN HDR 40POS SMD GOLD
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey () DF30RC-40DP-0.4V(81) Digi-Reel 4,459 1
    • 1 $1.05
    • 10 $0.86
    • 100 $0.70
    • 1000 $0.57
    • 10000 $0.53
    Buy Now
    DF30RC-40DP-0.4V(81) Cut Tape 4,459 1
    • 1 $1.05
    • 10 $0.90
    • 100 $0.76
    • 1000 $0.65
    • 10000 $0.61
    Buy Now
    Sager DF30RC-40DP-0.4V(81)
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Buy Now

    Hirose Electric Co Ltd DF37C-40DP-0.4V(53)

    CONN HDR 40POS SMD GOLD
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey () DF37C-40DP-0.4V(53) Cut Tape 2,190 1
    • 1 $1.48
    • 10 $1.26
    • 100 $1.07
    • 1000 $0.95
    • 10000 $0.95
    Buy Now
    DF37C-40DP-0.4V(53) Digi-Reel 2,190 1
    • 1 $1.58
    • 10 $1.38
    • 100 $1.23
    • 1000 $1.03
    • 10000 $1.03
    Buy Now
    DF37C-40DP-0.4V(53) Reel 1,000 1,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.91
    • 10000 $0.77
    Buy Now
    Avnet Abacus DF37C-40DP-0.4V(53) 14 Weeks 1,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Buy Now
    Sager DF37C-40DP-0.4V(53) 1,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.10
    • 10000 $0.88
    Buy Now

    C40D Datasheets Context Search

    Catalog Datasheet Type Document Tags PDF

    Contextual Info: 8 7 4 5 6 1 2 3 REVISIONS REV. ECO. NO DESCRIPTION DATE BY A 1255 INITIAL RELEASE 1/24/2007 MNH E F D F B A .100 2.54 E 2X E .075[1.90] CARDSLOT .125 3.18 C F .265 6.73 INSERTION DEPTH A D .186 4.72 D .431 10.95 .245 6.22 .440±.025 11.19±0.64 TAIL LENGTH


    Original
    C10879 Catalog\C10879, PDF

    C08DRA

    Abstract: C18DRA C52D C30DRA 1 MEGA OHM C25D
    Contextual Info: 8 7 4 5 6 1 2 3 REVISIONS ECO. NO DESCRIPTION DATE BY A 1249 INITIAL RELEASE 01-19-07 MNH B 1397 UPDATE/CORRECT PCB LAYOUT 6/21/2007 MNH E D B A F E REV. 2X .125 3.18 F .075 1.91 CARDSLOT .100 2.54 TYP. E C A .125±.025 3.18±0.64 TRIM TAILS F .186 4.72 .431 10.95


    Original
    C10876 Catalog\C10876, C08DRA C18DRA C52D C30DRA 1 MEGA OHM C25D PDF

    AR 9335

    Abstract: CI0922 UL 94v-0 board drs
    Contextual Info: REVISIONS REV. ECO. NO DESCRIPTION DATE BY A 1323 INITIAL RELEASE 3/28/2007 SB B 1695 CHANGING OF NOTES AND TOLERANCE 5/16/2008 IA i- .180 [4.57] .610 [15.49] .060 [1.52] □ .025 [0.64] FIT S 0.040 1.02] MIN H O LE C S E C T IO N A-A SCALE 4 : 1 DRSH NOTES:


    OCR Scan
    IDENTIFICATIO005 5M-1994 C10922 Catalog\CI0922. AR 9335 CI0922 UL 94v-0 board drs PDF

    C25DRS

    Contextual Info: 8 7 4 5 6 1 2 3 REVISIONS D B A .100 2.54 F REV. ECO. NO DESCRIPTION DATE BY A 1323 INITIAL RELEASE 3/28/2007 SB B 1695 CHANGING OF NOTES AND TOLERANCE 5/16/2008 IA F .075 1.91 CARDSLOT 2X .125 3.18 E E E C .370 9.40 .180 4.57 A D D .250 6.35 .550 13.97 .610 15.49


    Original
    5M-1994 C10922 Catalog\C10922, C25DRS PDF

    Contextual Info: •Optical Fixed Attenuators ●For Multimode HRS No. Product Number CL820-0063-0 HRFC-AT1S-B05A Attenuation ±1.5 dB 5dB Reflection Attenuation c22dB CL820-0064-3 HRFC-AT1S-B10A 10dB c22dB CL820-0065-6 HRFC-AT1S-B15A 15dB c22dB CL820-0066-9 HRFC-AT1S-B20A


    Original
    CL820-0063-0 CL820-0064-3 CL820-0065-6 CL820-0066-9 HRFC-AT1S-B05A HRFC-AT1S-B10A HRFC-AT1S-B15A HRFC-AT1S-B20A c22dB PDF

    HA11219

    Abstract: bl12a FR 420
    Contextual Info: HAI 1219 N oise S u p p r e s s o r S y s te m fo r FM R e c e iv e r s HA 11219 !i g i W ü FM -g{9 ; « y X f i l i F M ^ V -y? 7 ^ f ' ? - y t < n t , ^ I: 7 Ix lt ? i l tz IC t ' t , h '7 - f Fffl izffî A 5 ii £ -f-„ 4 7 ~ - y - s B > / 4 X t v -i ' * — / -Í X 'coj: 9 i.- ! * / -f X 'ii# - ® 100


    OCR Scan
    70kHz 100kHz( HA11219 To-25Â 120mV 120mV- 120mVâ 100kHz, 120mV HA11219 bl12a FR 420 PDF

    dkrh

    Abstract: dkrn S1191 S1243
    Contextual Info: 8 7 4 5 6 REVISIONS PART NUMBER CODING _ _ C _ _ DKR _ -S_ _ _ _ F E MATERIAL INSULATOR/CONTACT E = PBT/PHOSPHOR BRONZE OPERATING TEMP: -65°C TO +125°C PROCESSING TEMP: 260°C FOR 10 SECS MAX R = PPS/PHOSPHOR BRONZE OPERATING TEMP: -65°C TO +125°C PROCESSING TEMP: 260°C FOR 120 SECS MAX


    Original
    C10808 Drawings\C10808, -S1191, S1243 dkrh dkrn S1191 PDF

    sis m672

    Abstract: sis*307elv SiSm672 south bridge SIS 968 SiS307ELV 9LPR600CGLF ICS9LPR600 CLEVO intel meron cpu bu 2508 af equivalent
    Contextual Info: Preface Notebook Computer M72XSR Service Manual Preface I Preface Notice The company reserves the right to revise this publication or to change its contents without notice. Information contained herein is for reference only and does not constitute a commitment on the part of the manufacturer or any subsequent vendor. They assume no responsibility or liability for any errors or inaccuracies that may appear in this publication nor are


    Original
    M72XSR 1198K Z3702 C1G123D 1608K -121T sis m672 sis*307elv SiSm672 south bridge SIS 968 SiS307ELV 9LPR600CGLF ICS9LPR600 CLEVO intel meron cpu bu 2508 af equivalent PDF

    http://www.datasheetarchive.com/

    Contextual Info: DatasheetArchive .com Request For Quotation Order the parts you need from our real-time inventory database. Simply complete a request for quotation form with your part information and a sales representative will respond to you with price and availability.


    Original
    M68HC11 M68HC11RM/D http://www.datasheetarchive.com/ PDF

    Contextual Info: 8 7 4 5 6 REVISIONS PART NUMBER CODING _ _ C _ _ DKU _ -S_ _ _ _ F E MATERIAL INSULATOR/CONTACT E = PBT/PHOSPHOR BRONZE OPERATING TEMP: -65°C TO +125°C PROCESSING TEMP: 260°C FOR 10 SECS MAX R = PPS/PHOSPHOR BRONZE OPERATING TEMP: -65°C TO +125°C PROCESSING TEMP: 260°C FOR 120 SECS MAX


    Original
    C10995 Drawings\C10995, -S1191, S1243 PDF

    Contextual Info: 8 7 4 5 6 1 2 3 REVISIONS D .150 3.81 ECO. NO DESCRIPTION DATE BY A 1525 INITIAL RELEASE 10/15/2007 VJ A .275 6.99 F REV. F 2X .125 3.18 FOR S MOUNTING .043 1.09 MIN .100 2.54 CONTACT MARKINGS 1 3 5 . 195 197 199 2 4 6 . 196 198 200 PC BOARD LAYOUT


    Original
    C10989 Catalog\C10989, PDF

    Contextual Info: 8 7 4 5 6 1 2 3 REVISIONS D 2X .125 3.18 FOR S MOUNTING A REV. ECO. NO DESCRIPTION DATE BY A 1505 INITIAL RELEASE 9/13/2007 VJ F .275 6.99 F .200 5.08 .100 2.54 PC BOARD LAYOUT CONNECTOR SIDE E D B A E FIRST POSITION INDICATOR CONTACT MARKINGS: 1 3 5 . 99


    Original
    DTAH-S189 -S189 C10969 Catalog\C10969, -S189 PDF

    Contextual Info: •Fixed Attenuators ●For Multimode Attenuation Split Sleeve Reflection ±1.5dB Attenuation 5dB CL820-0075-0-01 HSC-AT1S-B05A(01) 10dB CL820-0076-2-01 HSC-AT1S-B10A(01) Copper alloy CL820-0077-5-01 HSC-AT1S-B15A(01) 15dB Notes CL820-0078-8-01 HSC-AT1S-B20A(01)


    Original
    CL820-0075-0-01 HSC-AT1S-B05A CL820-0076-2-01 HSC-AT1S-B10A CL820-0077-5-01 HSC-AT1S-B15A CL820-0078-8-01 HSC-AT1S-B20A CL820-0094-4 HSC-AT4S-B05A PDF

    C10807

    Abstract: 4835 aa S1191 S1243
    Contextual Info: 8 7 4 5 6 REVISIONS PART NUMBER CODING _ _ C _ _ DKM _ -S_ _ _ _ F E MATERIAL INSULATOR/CONTACT E = PBT/PHOSPHOR BRONZE OPERATING TEMP: -65°C TO +125°C PROCESSING TEMP: 260°C FOR 10 SECS MAX R = PPS/PHOSPHOR BRONZE OPERATING TEMP: -65°C TO +125°C PROCESSING TEMP: 260°C FOR 120 SECS MAX


    Original
    C10807 Drawings\C10807, -S1191, S1243 C10807 4835 aa S1191 PDF

    ADD32

    Abstract: MPASM code macro endm q15 microchip DN-12 78523 AN540 PIC17C42 1A45 implementation of 3rd order iir filter 6a1a
    Contextual Info: AN540 Implementing IIR Digital Filters Author: Amar Palacherla Microchip Technology Inc. INTRODUCTION This application note describes the implementation of various digital filters using the PIC17C42, the first member of Microchip’s 2nd generation of 8-bit


    Original
    AN540 PIC17C42, PIC17C42 ADD32 MPASM code macro endm q15 microchip DN-12 78523 AN540 1A45 implementation of 3rd order iir filter 6a1a PDF

    Contextual Info: Optical Fixed Attenuators •Features 1. Superb operational qualities. These fixed attenuators are of the Plug-Jack type and offer superb operational qualities in comparison to the Jack-Jack type when mounted to panel interfaces and in other applications.


    Original
    GI-50/125 HRFC-AT1S-B05A HRFC-AT1S-B10A HRFC-AT1S-B15A HRFC-AT1S-B20A HRFC-AT1S-A05A HRFC-AT1S-A10A HRFC-AT1S-A15A HRFC-AT1S-A20A HRFC-AT1K-A05A PDF

    1a47

    Abstract: c code iir filter design DN-12 c code iir filter DS00540 k1 6026 3BF2 7F39 AN540 7E36
    Contextual Info: Implementing IIR Digital Filters AN540 Implementing IIR Digital Filters INTRODUCTION THEORY OF OPERATION This application note describes the implementation of various digital filters using the PIC17C42, the first member of Microchip’s 2nd generation 8-bit microcontrollers.


    Original
    AN540 PIC17C42, PIC17C42 250ns 1a47 c code iir filter design DN-12 c code iir filter DS00540 k1 6026 3BF2 7F39 AN540 7E36 PDF

    Burndy PAT750-18V parts breakdown

    Abstract: BURN GI CONDUIT lp 1610 for door bell Burndy Y35 hypress parts breakdown ci an 7591 NEC c317 KPC 45 94V SAE-AS7928 burndy Y35 Hypress owner manual burndy patriot pat750-18v replacement parts
    Contextual Info: Master Catalog Solutions for the Electrical Industry Experience. Technology. Answers. TM Customer Service Department 7 Aviation Park Drive Londonderry, NH 03053 1-800-346-4175 1-603-647-5299 International Canada 1-800-361-6975 (Quebec) 1-800-387-6487 (All other provinces)


    Original
    PDF

    Contextual Info: 8 7 4 5 6 1 2 3 REVISIONS REV. ECO. NO DESCRIPTION DATE BY A 1525 INITIAL RELEASE 10/9/2007 VJ F F CONTACT MARKINGS 1 3 5 . 195 197 199 2 4 6 . 196 198 200 E D FIRST POSITION INDICATOR B A .075 1.91 CARDSLOT E E 2X CONTACT ID SCALE 4:1 PINS OMITTED FOR CLARITY


    Original
    C10980 Catalog\C10980, PDF

    C10245

    Contextual Info: 8 7 4 5 6 1 2 3 REVISIONS D B A REV. ECO. NO DESCRIPTION DATE BY A 301 INITIAL RELEASE 06-07-04 AJT B 1315 TABULATE MATERIAL, UPDATE FORMAT 3/5/2008 MNH F F .075 1.91 CARDSLOT WIDTH 2X E .125 3.18 E .100 2.54 E C .370 9.40 A .297 7.54 INSERTION DEPTH .180 4.57


    Original
    DCCH-S189 -S189 C10245 Catalog\C10245, -S189 C10245 PDF

    Contextual Info: 8 7 4 5 6 1 2 3 REVISIONS CONTACT MARKINGS B 1 2 3 . 60 B A 1 2 3 . 60 A REV. ECO. NO DESCRIPTION DATE BY A 1490 INITIAL RELEASE 08/29/07 ASK F F .043 1.09 MIN 2X .125 3.18 FOR S MTG ONLY .185 4.70 E D B A E .100 2.54 .156 3.96 CONTACT ID SCALE 4:1 E


    Original
    DRAH-S93 C10967 Drawings\C10967, PDF

    Contextual Info: 8 7 4 5 6 1 2 3 REVISIONS REV. ECO. NO DESCRIPTION DATE BY A 1525 INITIAL RELEASE 10/10/2007 VJ F F CONTACT MARKINGS 1 3 5 . 195 197 199 2 4 6 . 196 198 200 E D FIRST POSITION INDICATOR B A .075 1.91 CARDSLOT E 2X E CONTACT ID SCALE 4:1 PINS OMITTED FOR CLARITY


    Original
    C10983 Catalog\C10983, PDF

    south bridge SIS 968

    Abstract: SiS968 IT8512E AO4468 equivalent SiS307ELV M720S sc413 TI 8512E 850 va inverter schematic diagram CLEVO
    Contextual Info: Preface Notebook Computer M720S Service Manual Preface I Preface Notice The company reserves the right to revise this publication or to change its contents without notice. Information contained herein is for reference only and does not constitute a commitment on the part of the manufacturer or any subsequent vendor. They assume no responsibility or liability for any errors or inaccuracies that may appear in this publication nor are


    Original
    M720S vend37 SCS551V-30 HSX531S 12MHz SN74LVC1G123DCT south bridge SIS 968 SiS968 IT8512E AO4468 equivalent SiS307ELV sc413 TI 8512E 850 va inverter schematic diagram CLEVO PDF

    c41dc

    Abstract: C40ACA oac5 schematic c41dcg OAC5AQ rc 548 transistor GORDOS OAC 24 Gordos OAC5A Gordos OAC5AH Gordos idc5f
    Contextual Info: DIGITAL I/O MODULES 0.6 INCH INPUT MODULES FEATURES: CE Compliant Plug into Mounting Boards for 0.6˝ Modules AC Inputs for 24 V, 120 V, 240 V DC Inputs for 3.3 to 32 V, 10 to 48 V UL Recognized E46203 / CSA Certified (38595) 4 kV Optical Isolation Open-Collector Output


    Original
    E46203) c41dc C40ACA oac5 schematic c41dcg OAC5AQ rc 548 transistor GORDOS OAC 24 Gordos OAC5A Gordos OAC5AH Gordos idc5f PDF