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

    P331 Search Results

    P331 Result Highlights (5)

    Part ECAD Model Manufacturer Description Download Buy
    BLM21SP331SN1D
    Murata Manufacturing Co Ltd Ferrite Chip, 1 Function(s), 1.9A, 2 Pin(s) PDF
    BLM21SP331SZ1B
    Murata Manufacturing Co Ltd Ferrite Chip, 1 Function(s), 1.9A, 2 Pin(s) PDF
    BLM21SP331SH1D
    Murata Manufacturing Co Ltd Ferrite Chip, 1 Function(s), 1.9A, 2 Pin(s) PDF
    BLM21SP331SN1B
    Murata Manufacturing Co Ltd Ferrite Chip, 1 Function(s), 1.9A, 2 Pin(s) PDF
    BLM21SP331BH1D
    Murata Manufacturing Co Ltd Ferrite Chip, 1 Function(s), 0.01A, 2 Pin(s) PDF

    P331 Datasheets (150)

    Select Manufacturer
    Part ECAD Model Manufacturer Description Datasheet Type PDF PDF Size Page count
    P33-1
    Daburn Electronics Power Supplies - Board Mount - AC DC Converters - AC-DC POWER MODULE +/- 15VDC OUT Original PDF 335.64KB
    P33-10
    Daburn Electronics Power Supplies - Board Mount - AC DC Converters - AC-DC POWER MODULE +/- 10VDC OUT Original PDF 335.64KB
    P33-10-04
    Daburn Electronics Power Supplies - Board Mount - AC DC Converters - AC-DC POWER MODULE +/- 10VDC OUT Original PDF 335.64KB
    P33-100S
    Daburn Electronics Power Supplies - Board Mount - AC DC Converters - AC-DC POWER MODULE 100VDC OUTPUT Original PDF 335.64KB
    P33-100S-04
    Daburn Electronics Power Supplies - Board Mount - AC DC Converters - AC-DC POWER MODULE 100VDC OUTPUT Original PDF 335.64KB
    P33-100S/22
    Daburn Electronics Power Supplies - Board Mount - AC DC Converters - AC-DC POWER MODULE 100VDC OUTPUT Original PDF 335.64KB
    P33-100SAX
    Daburn Electronics Power Supplies - Board Mount - AC DC Converters - AC-DC POWER MODULE 100VDC OUTPUT Original PDF 335.64KB
    P33-100S-FST
    Daburn Electronics Power Supplies - External/Internal (Off-Board) - AC DC Converters - AC-DC POWER MODULE 100VDC OUTPUT Original PDF 335.64KB
    P33-100SQ
    Daburn Electronics Power Supplies - Board Mount - AC DC Converters - AC-DC POWER MODULE 100VDC OUTPUT Original PDF 335.64KB
    P33-100SQX
    Daburn Electronics Power Supplies - Board Mount - AC DC Converters - AC-DC POWER MODULE 100VDC OUTPUT Original PDF 335.64KB
    P33-100ST
    Daburn Electronics Power Supplies - External/Internal (Off-Board) - AC DC Converters - AC-DC POWER MODULE 100VDC OUTPUT Original PDF 335.64KB
    P33-100SW
    Daburn Electronics Power Supplies - Board Mount - AC DC Converters - AC-DC POWER MODULE 100VDC OUTPUT Original PDF 335.64KB
    P33-100SX
    Daburn Electronics Power Supplies - Board Mount - AC DC Converters - AC-DC POWER MODULE 100VDC OUTPUT Original PDF 335.64KB
    P33-100SXA
    Daburn Electronics Power Supplies - Board Mount - AC DC Converters - AC-DC POWER MODULE 100VDC OUTPUT Original PDF 335.64KB
    P33-100SXE
    Daburn Electronics Power Supplies - Board Mount - AC DC Converters - AC-DC POWER MODULE 100VDC OUTPUT Original PDF 335.64KB
    P33101
    Senisys Thrubeams Miniature LED Pair - L33 / P33 Series Scan PDF 286.98KB 2
    P33101
    Senisys THRUBEAMS Miniature LED Pair Scan PDF 286.99KB 2
    P33-10/22
    Daburn Electronics Power Supplies - Board Mount - AC DC Converters - AC-DC POWER MODULE +/- 10VDC OUT Original PDF 335.64KB
    P33-1-04
    Daburn Electronics Power Supplies - Board Mount - AC DC Converters - AC-DC POWER MODULE +/- 15VDC OUT Original PDF 335.64KB
    P33108
    Senisys Thrubeams Miniature LED Pair - L33 / P33 Series Scan PDF 286.98KB 2
    ...
    SF Impression Pixel

    P331 Price and Stock

    Select Manufacturer

    OTTO Engineering Inc P3-31111

    Sealed Momentary Action Pushbutton
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Master Electronics P3-31111 47
    • 1 -
    • 10 $15.89
    • 100 $13.93
    • 1000 $11.71
    • 10000 $11.71
    Buy Now
    Verical P3-31111 45 5
    • 1 -
    • 10 $18.94
    • 100 $18.02
    • 1000 $18.02
    • 10000 $18.02
    Buy Now
    Sager P3-31111 481 1
    • 1 $16.09
    • 10 $16.09
    • 100 $15.85
    • 1000 $11.84
    • 10000 $10.86
    Buy Now
    Powell Electronics P3-31111 15 1
    • 1 $30.93
    • 10 $30.93
    • 100 $27.07
    • 1000 $23.97
    • 10000 $23.97
    Buy Now
    Neutron USA P3-31111 50
    • 1 $49.99
    • 10 $49.99
    • 100 $49.99
    • 1000 $49.99
    • 10000 $49.99
    Buy Now

    Oslo Switch Inc RTP331A9M9

    DP ROCKER NON LIGHTED BLK
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Master Electronics RTP331A9M9 46
    • 1 -
    • 10 $12.83
    • 100 $7.67
    • 1000 $4.75
    • 10000 $4.75
    Buy Now

    TE Connectivity CPGI-GELWRAP-33/10-250

    Water Resistant Wraparound Splice Closure - GelWrap - 1000V - 2 AWG to 500 MCM Conductor Size - 6.0 (150mm) Connector Opening - 0.40 - 1.30 (10mm - 33mm) Diameter Range - 10.0 (250mm) Sleeve Length - Black.
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Master Electronics CPGI-GELWRAP-33/10-250 13
    • 1 -
    • 10 $14.75
    • 100 $14.16
    • 1000 $14.16
    • 10000 $14.16
    Buy Now

    Struthers-Dunn 219XBXP33-120A

    Electromechanical Relay 120VAC 540Ohm 10A DPDT (64.1x36.8x83.7)mm Plug-In General Purpose Relay
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Master Electronics 219XBXP33-120A 1
    • 1 $504.46
    • 10 $496.53
    • 100 $496.53
    • 1000 $496.53
    • 10000 $496.53
    Buy Now

    TE Connectivity GELWRAP-33/10-300(B12)

    GELWRAP-33/10-300(B12)
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Master Electronics GELWRAP-33/10-300(B12)
    • 1 $32.16
    • 10 $30.08
    • 100 $25.55
    • 1000 $24.87
    • 10000 $24.87
    Buy Now

    P331 Datasheets Context Search

    Catalog Datasheet Type Document Tags PDF

    P681K

    Contextual Info: P SERIES ELECTRICAL CHARACTERISTICS Piconics Part Number Military Specification P100K-8I P120K-8I P150K-8I P180K-8I P220K-8I P270K-8I P330K-8I P390K-8I P470K-8I P560K-8I P680K-8I P820K-8I P101K-8I P121K-8I P151K-8I P181K-8I P221K-8I P271K-8I P331K-8I P391K-8I


    OCR Scan
    p100k-8ip120k-8ip150k-8ip180k-8i+7p220k-8ip270k-8ip330k-8ip390k-8ip470k-8ip560k-8ip681k PDF

    KS57P3316

    Abstract: P3316 P331 KS57C3316 SAM47
    Contextual Info: KS57C3316/P3316 1 PRODUCT OVERVIEW PRODUCT OVERVIEW OVERVIEW The KS57C3316 single-chip CMOS microcontroller has been designed for high performance using Samsung's newest 4-bit CPU core, SAM47 Samsung Arrangeable Microcontrollers . With features such as LCD direct drive capability, 4-channel A/D converter, 8-bit timer/counter, watch timer and


    Original
    ks57c3316/p3316ks57c3316sam4780-pin+640-pintb573316aas40d-aks57p3316p3316p331 PDF

    p331

    Abstract: SGSP130
    Contextual Info: S G S-THOMSON 07E D | 7 ^ 2 3 7 0Dl7fl07 b | _ 73C 1 7 3 0 4 _ O j T Z J - O y _ _ ê f. V ñ K W% i I 1 • SGSP13Ò/P13Ì/P132 ;] SGSP230/P231/P232 .4 SGSP330/P331/P332 - 1 N-CHÀNNEL POWER MOS TRANSISTORS & HIGH SPEED SWITCHING APPLICATIONS These products are diffused multi-cell silicon gate


    OCR Scan
    0dl7fl07sgsp13/p132sgsp230/p231/p232+7sgsp330/p331/p332ot-82o-220sgsp130sgsp230sgsp330p331 PDF

    Contextual Info: P SERIES ELECTRICAL CHARACTERISTICS Piconics Part Number Military Specification P100K-8I P120K-8I P150K-8I P180K-8I P220K-8I P270K-8I P330K-8I P390K-8I P470K-8I P560K-8I P680K-8I P820K-8I P101K-8I P121K-8I P151K-8I P181K-8I P221K-8I P271K-8I P331K-8I P391K-8I


    OCR Scan
    p100k-8ip120k-8ip150k-8ip180k-8i+6p220k-8ip270k-8ip330k-8ip390k-8ip470k-8ip560k-8i PDF

    P3316

    Abstract: KS57C3316 KS57P3316 SAM47 7" LCD 800 x 600 with TCON
    Contextual Info: KS57C3316/P3316 1 PRODUCT OVERVIEW PRODUCT OVERVIEW OVERVIEW The KS57C3316 single-chip CMOS microcontroller has been designed for high performance using Samsung's newest 4-bit CPU core, SAM47 Samsung Arrangeable Microcontrollers . With features such as LCD direct drive capability, 4-channel A/D converter, 8-bit timer/counter, watch timer and


    Original
    ks57c3316/p3316ks57c3316sam4780-pin+3ks57p3316p33167" lcd 800 x 600 with tcon PDF

    ATS-273

    Abstract: 2811B BS7002 P3311 P3356
    Contextual Info: PRODUCT DATA SHEET P3311 LOW COST, LOW DISTORTION LINE MATCHING TRANSFORMER Features Applications ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ V.90 and V.92 Modems ∗ V.34 Modems Low Cost Low Distortion 12.6mm 0.5” Seated Height Industry Standard Pinout


    Original
    p33112811bats-27356kbps+312kvrmsbs7002p3356 PDF

    P281 B01

    Abstract: G187
    Contextual Info: LogiCORE IP Processing System 7 v4.02a DS871 October 16, 2012 Product Specification Introduction LogiCORE IP Facts Table The Processing System 7 IP is the software interface around the Zynq Processing System. The Zynq -7000 family consists of an system-on-chip (SoC) style


    Original
    ds871zynq-7000p281 b01g187 PDF

    diagram LG LCD TV circuits

    Abstract: ADV7180WBST48Z-RL colour tv power supply circuit diagram adv7180 ADV7180BCP32Z LINE320 ADV7180BCP32Z-RL lg lcd tv POWER SUPPLY SCHEMATIC
    Contextual Info: 10-Bit, 4x Oversampling SDTV Video Decoder ADV7180 Data Sheet FEATURES APPLICATIONS Qualified for automotive applications Worldwide NTSC/PAL/SECAM color demodulation support One 10-bit ADC, 4× oversampling for CVBS, 2× oversampling for Y/C mode, and 2× oversampling for YPrPb per channel


    Original
    10-bitadv7180d05700-0-3/12diagram lg lcd tv circuits+6adv7180wbst48z-rlcolour tv power supply circuit diagramadv7180bcp32zline320adv7180bcp32z-rllg lcd tv power supply schematic PDF

    PC28F256P33

    Abstract: JS28F256P33 PC48F pc28F256P33T PC28F256P33B PC28F256p33bf PC28F256P33TF DIODE 61 BP DIODE BP truth table NOT gate 74
    Contextual Info: NumonyxTM StrataFlash Embedded Memory P33-65nm 256-Mbit, 512-Mbit (256M/256M) Datasheet Product Features „ „ „ High performance: — 95ns initial access time for Easy BGA — 105ns initial access time for TSOP — 25ns 16-word asynchronous-page read


    Original
    p33-65nm256-mbit512-mbit256m/256m+15105ns16-word52mhz512-word32-kbytepc28f256p33js28f256p33pc48fpc28f256p33tpc28f256p33bpc28f256p33bfpc28f256p33tfdiode 61 bpdiode bptruth table not gate 74 PDF

    user manual of XRT91L31

    Contextual Info: XRT86SH328 SONET TO 28-T1/21-E1 PDH MAPPER - VOYAGER PIN AND ARCHITECTURE DESC MAY 2008 REV. 1.0.0 GENERAL DESCRIPTION The XRT86SH328 Voyager is a physical layer SONET/SDH to PDH mapper/demapper which enables T1/E1 aggregation to STS-3/STM-1 or STS1/ STM0 via standard VT1.5/VT2 or VC-11/VC-12 to


    Original
    xrt86sh32828-t1/21-e1vc-11/vc-12user manual of xrt91l31 PDF

    SL-1-C1-0R050L

    Contextual Info: ANALOG ► DEVICES Precision Voltage Regulator Controller P3310 FEATURES ±1.5% Accuracy Over Line, Load and Temperature Low Power BiCMOS: 800 |*.A Quiescent Current Shutdown Current: 1 |j.A Typical Stable with 10 |iF Load Capacitor +2.5 V to +15 V Operating Range


    OCR Scan
    adp3310q052bbhsl-1-c1-0r050l PDF

    B083D

    Abstract: u82720 A110D TDA4100 ub8830d V40511D taa981 A109D sy 710 IC 7447
    Contextual Info: > i ! U O i j q > i a | a S [ ^ ] 0 [ y y H erstellerbetriebe Bei den einzelnen Erzeugnissen werden die Herstellerbetriebe durch die nachfolgend angegebenen Symbole gekennzeichnet: VEB M ik ro e le k tro n ik „K a rl M a r x “ Erfurt L e itb e tr ie b im VEB K o m b in a t M ik ro e le k tr o n ik


    OCR Scan
    b083du82720a110dtda4100+6ub8830dv40511dtaa981a109dsy 710ic 7447 PDF

    pc28f128p33b

    Abstract: PC28F128P33 JS28F128P33BF js28f640p33 pc28f128p33bf60 P33-65nm RC28F128P33 JS28F128P33TF70 JS28F128P33 PC28F128P33T
    Contextual Info: Numonyx AxcellTM P33-65nm Flash Memory 128-Mbit, 64-Mbit Single Bit per Cell SBC Datasheet Product Features „ „ „ High performance: — 60ns initial access time for Easy BGA — 70ns initial access time for TSOP — 25ns 8-word asynchronous-page read


    Original
    p33-65nm128-mbit64-mbit52mhz+13256-word32-kbyte128-kbyte40mhzpc28f128p33bpc28f128p33js28f128p33bfjs28f640p33pc28f128p33bf60rc28f128p33js28f128p33tf70js28f128p33pc28f128p33t PDF

    pc28f00ap33

    Abstract: JS28F00AP33BF JS28F512P33BF PC28F00BP33EF PC28F00BP33 JS28F512P33EF PC28F512P33 JS28F512P33 PC28F00AP33EF JS28F512
    Contextual Info: Numonyx Axcell P33-65nm Flash Memory 512-Mbit , 1-Gbit , 2-Gbit Datasheet Product Features „ High performance: „ TSOP: — 105ns initial access time 512-Mbit, 1-Gbit Easy BGA and TSOP: — Buffered Enhanced Factory Programming at 2.0MByte/s (typ) using 512-word buffer


    Original
    p33-65nm512-mbit100ns16-word+1452mhz105ns512-word46mbyte/spc28f00ap33js28f00ap33bfjs28f512p33bfpc28f00bp33efpc28f00bp33js28f512p33efpc28f512p33js28f512p33pc28f00ap33efjs28f512 PDF

    C 945 P331

    Abstract: transistor RCA 467 RCA 417 847 transistor rca4 458 MSX532 P185 RCA 618 727 RCA 937 fairchild PJ 1169
    Contextual Info: MSX Register Programming Manual Revision 2.1 February 2003 Revision History Revision 1.0, March 2000—Preliminary Release. Revision 1.1, May 2000—Initial Release. Revision 1.2, July 2000—Updated the RCC[1] connection information in the “Crosspoint Programming” section


    Original
    2000--preliminary2000--initial2000--updated2000--globally+11msx532msx532/msx340c 945 p331transistor rca 467rca 417 847transistor rca4 458p185rca 618727 rca937 fairchildpj 1169 PDF

    Contextual Info: P3 COMMERCIAL PUSHBUTTONS COMMERCIAL GRADE PUSHBUTTONS SEALED AGAINST DUST AND MOISTURE, SNAP-ACTION, DOUBLE-BREAK Makes and breaks every time! Less than 25 milliohms contact resistance because the OTTO design features inherent rockingaction that breaks welds and wipes contacts clean.


    Original
    p3-90037p3-90009 PDF

    EATON CM20A

    Abstract: A5 GNE mosfet Hall sensor 44e 402 2N8491 FTG 1087 S TRIAC BCR 10km FEB3T smd transistor marking 352a sharp EIA 577 sharp color tv schematic diagram MP-130 M mh-ce 10268
    Contextual Info: Table of Contents N E W A R K E L E C T R O N IC S “Where serving you begins even before you call” Newark Electronics is a UNIQUE broadline distributor of electronic components, dedicated to provid­ ing complete service, fast delivery and in-depth inventory. Our main


    OCR Scan
    eaton cm20aa5 gne mosfethall sensor 44e 4022n8491+6ftg 1087 striac bcr 10kmfeb3tsmd transistor marking 352asharp eia 577 sharp color tv schematic diagrammp-130 m mh-ce 10268 PDF

    C6198

    Abstract: a17 c178 100v 12p quanta TMS 3617 CX20468-31 mtp42 cpu c644 100v 27p capacitor 100u 63V a70 4013 100 12p Quanta KT2
    Contextual Info: 5 4 3 2 PCB Rev: A 1 Sch ver : 20040402_07 KT2 BLOCK DIAGRAM D PCB STACK UP LAYER 1 : TOP D PENTIUM-M / Montara-GM / ICH4-M LAYER 2 : GND LAYER 3 : IN1 CPU PENTIUM-M CPU THERMAL SENSOR LAYER 4 : IN2 GMT-781 478 Pins micro FC-PGA PAGE: 3 LAYER 5 : VCC 14.318MHz


    Original
    4x100mhzgmt-781318mhzcy28346/+16ics950810max1907max1999266mhzdtc144eua2n7002ec6198a17 c178 100v 12pquantatms 3617cx20468-31mtp42cpu c644 100v 27pcapacitor 100u 63va70 4013 100 12pquanta kt2 PDF

    fet B20 p03

    Abstract: u7620 DCD-1530 BC148 pin configuration wistron docking foxconn WISTRON power sequence FW82807A Wistron Corporation SC 3062
    Contextual Info: ÌÓíêð Ð ±¶»½¬ ½±¼»æ çïòìëÍðïòððï ÐÝÞ ÐñÒæìèòìëÍðïòÈÈÈ ÎÛÊxÍ×ÑÒæ óï Ó±¾•´» ÝÐË Ôîæ ÙÒÜ Ì«¿´¿¬·² ÝÔÕÙÛÒò ×Ó× Ýçèîé í ÷ Ôíæ Í·¹²¿´ î øÝÔÕ ÝÎÌ ÝÑÒÒ


    Original
    slcx32tslcx32tslcx74tsahc14+13tsahc08tshc4066tm360fet b20 p03u7620dcd-1530bc148 pin configurationwistron dockingfoxconnwistron power sequencefw82807awistron corporationsc 3062 PDF

    new bright R288

    Abstract: pc87541v sis*307elv ICS9LPR600 CX20549-12 Reference design RTL8211BL MX318 new bright R266 CX20549 SiS662
    Contextual Info: 1 2 3 PCB STACK UP 4 5 6 TW5 Block Diagram LAYER 1 : TOP LAYER 2 : SGND LAYER 3 : IN1 A LAYER 4 : IN2 LAYER 5 : VCC AC/BATT CONNECTOR RUN POWER SW PG 39 BATT CHARGER LAYER 6 : IN3 LAYER 7 : SGND LAYER 8 : BOT PG 39 8 DC/DC +3VPCU +5VPCU DC/DC +1.05V +1.5V


    Original
    ics9lpr6001w/35wics9p935667mhz+14m662mx307lv31x31mui7402datw5mb18b7new bright r288pc87541vsis*307elvcx20549-12reference design rtl8211blmx318new bright r266cx20549sis662 PDF

    wireless TV headphone mini project

    Abstract: quanta hp pavilion g6 LED1013 PIC PROJECT CCS C TOUCHPAD PC97551 MC1231 p31b diode quanta computer C3452
    Contextual Info: 1 2 3 4 5 6 8 CT1 BLOCK DIAGRAM PCB STACK UP LAYER 1 : TOP PENTIUM-M / Montara-GM / ICH4-M LAYER 2 : GND A 7 LAYER 3 : IN1 CPU PENTIUM-M CPU THERMAL SENSOR LAYER 4 : IN2 GMT-781 478 Pins micro FC-PGA PAGE: 3 LAYER 5 : VCC 14.318MHz A SYSTEM POWER(1.2V/1.05V/1.25V)


    Original
    gmt-781318mhzcy28346/ics950810+16max19074x100mhzmax1999266mhzpq1122n7002ewireless tv headphone mini projectquantahp pavilion g6led1013pic project ccs c touchpadpc97551mc1231p31b diodequanta computerc3452 PDF

    max8770

    Abstract: bpm t105 ICS9LPRS355AGLFT G545B1 ac41 cn19 100v 1p0 quanta h48 diode zener Zener diode H48 quanta computer MMBS3904
    Contextual Info: 1 2 3 4 5 7 8 LE5 BLOCK DIAGRAM module PCB STACK UP LAYER 1 : TOP LAYER 2 : SGND1 A 6 CPU THERMAL SENSOR CPU Merom LAYER 3 : IN1 LAYER 4 : SVCC 14.318MHz A PAG 5 478P (uPGA)/35W PAG 3,4 LAYER 5 : IN2 01 CLK_CPU_BCLK,CLK_CPU_BCLK# CLOCK GEN CLK_MCH_BCLK,CLK_MCH_BCLK#


    Original
    318mhzics9lprs355aglft64pinstssopg72m-128+14max8724sdm10k45-7-f/40v/0sc42151u/10v/x7r10u/4v/x6smax8770bpm t105g545b1ac41 cn19 100v 1p0quantah48 diode zenerzener diode h48quanta computermmbs3904 PDF

    Contextual Info: 10-Bit, SDTV Video Decoder with Differential Inputs ADV7182 Data Sheet FEATURES RoviTM Macrovision copy protection detection NTSC/PAL/SECAM autodetection 8-bit ITU-R BT.656 YCrCb 4:2:2 output and HS, VS, or FIELD Full-featured VBI data slicer with teletext support (WST)


    Original
    10-bitadv718232-leadd11001-0-9/14 PDF

    IR PAIR

    Abstract: p33001 Skan-a-matic Skan-a-matic p33001 P33101 IR LED 810 nm L33007 T41300 NCV303LSN16T1G L33014
    Contextual Info: V M t~ o I INDUSTRIAL PRODUCTS I SEM SfeYS S G N ä tri fvJTEGRATED SYSTEMS I FASCO I N P S/ S E N I SY S 40 E D 34^^730 00013 ßö 30 SENI. H THRUBEAM S Miniature LED Pair L33/P33 Series ft Features: • IR or Visible R ed LE D light Source Available ■


    OCR Scan
    l33/f33l33/p33l33008l33018+14l33108p33008p33018p33108ir pairp33001skan-a-maticskan-a-matic p33001p33101ir led 810 nml33007t41300ncv303lsn16t1gl33014 PDF