MDP(X)

Fa'amatalaga Puupuu:

Fa'ameamea fa'ameamea a le Polypropylene Film Capacitors

  • DC-LINK capacitor mo PCB
  • Metallized polypropylene film fausaga
  • fa'apipi'i pusa palasitika, fa'atumu epoxy resin (UL94 V-0)
  • Lelei tele le faatinoga o le eletise

Fa'amatalaga Oloa

lisi o oloa fa'asologa

Faailoga o oloa

Vaega Fa'ainisinia Autu

Aitema uiga
Fa'asinomaga tulaga GB/T 17702 (IEC 61071)
Voli fa'atatau 500Vd.c.-1500Vd.c.
Avanoa avanoa 5uF~240uF
Vaega o le tau 40/85/56,40/105/56
Va'aiga vevela o galuega -40 ℃ ~ 105 ℃ (85 ℃ ~ 105 ℃: faʻaititia le voltage faʻatatau i le 1.35% mo le 1 tikeri faʻateleina le vevela)
Vavega gafatia ±5%(J),±10%(K)
Taofi le voltage 1.5Un (10s,20℃±5℃)
Tete'e puipui >10000s (20℃,100Vd.c.,60s)
Fa'auluina o le tagata lava ia (Ls) <1nH/mm va'aiga ta'ita'i
Dielectric gau gau 0.0002
Tulaga maualuga maualuga I (A) I=C>
E le mafai ona toe faia peak peak current 1.4I (1000 taimi i le olaga)
Ova malosi 1.1 Un (30%/d ole umi ole uta)
1.15 Un(30min/d)
1.2 Un (5min/d)
1.3 Un(1min/d)
1.5Un (I le taimi o le olaga o lenei capacitor, 1000 overvoltages tutusa ma 1.5Un ma tumau 30ms ua faatagaina)
Fa'amoemoe ole olaga 100000h@Un,70℃,0hs=85℃
Fa'ato'ilalo fua <300FIT@Un,70℃,0hs=85℃

Ata Fa'atauga o Mea

Fua Fa'aletino(iunite:mm)

Fa'amatalaga: O fua o oloa e i le mm. Fa'amolemole va'ai i le "Tula'au Fuafuaga o Mea'ai" mo fua fa'apitoa.

 

Le Fa'amoemoe Autu

Nofoaga fa'aoga
◇Solar inverter
◇Sapalai eletise e le motusia
◇ Alamanuia tau militeri, eletise maualuga maualuga
◇ Ta'avale ta'avale, fa'aputu fa'atumu

Fa'atomuaga i Pusa Ata Ata Manifinifi

capacitors ata tifaga manifinifi o vaega faaeletonika taua tele faaaogaina i matagaluega faaeletonika. E aofia ai se mea fa'amama (e ta'ua o le dielectric layer) i le va o ta'ita'i se lua, e mafai ona teuina le tau ma fa'asalalau fa'ailo eletise i totonu o se matagaluega. Pe a faatusatusa i capacitors electrolytic masani, capacitors ata tifaga manifinifi e masani ona faaalia maualuga mautu ma gau gau. E masani lava ona faia le mea fa'a-dielectric i polymers po'o u'amea u'amea, ma mafiafia e masani lava i lalo ifo o nai micrometers, o le mea lea o le igoa "tifi manifinifi". Ona o le laʻititi laʻititi, mama le mamafa, ma le mautu o le faʻatinoga, e maua ai e masini ata tifaga manifinifi le tele o faʻaoga i oloa faʻaeletoroni e pei o smartphones, tablets, ma masini eletise.

O faʻamanuiaga autu o capacitors ata tifaga e aofia ai le maualuga capacitance, maualalo gau, faʻatinoga mautu, ma le umi o le olaga. O lo'o fa'aaogaina i fa'aoga eseese e aofia ai le fa'atonutonuina o le mana, feso'ota'iga fa'ailo, fa'amamāina, fa'aoso fa'asolo, masini, manatua, ma fa'aoga leitio (RF). A'o fa'aauau pea ona fa'atupula'ia le mana'oga mo mea fa'aeletoroni laiti ma sili atu, su'esu'ega ma atina'e taumafaiga i masini ata manifinifi o lo'o aga'i pea i luma e fa'afetaui mana'oga o maketi.

I se aotelega, o masini ata tifaga manifinifi e faia se sao taua i mea tau eletise faʻaonaponei, faʻatasi ai ma lo latou mautu, faʻatinoga, ma faʻaoga lautele e avea ai ma vaega taua i le mamanu matagaluega.

Fa'aaogāga o Pusa Ata Ata Manifinifi i Alamanuia Eseese

Fa'aeletonika:

  • Telefonitelefoni ma Papamaa: E faʻaogaina mea faʻapipiʻi ata manifinifi i le puleaina o le eletise, faʻapipiʻi faʻailoga, faʻamama, ma isi taʻavale e faʻamautinoa ai le mautu ma le faʻatinoga o masini.
  • Televise ma Fa'aaliga: I tekinolosi e pei o fa'aaliga tioata vai (LCDs) ma diodes fa'amalama fa'aola (OLEDs), o lo'o fa'aogaina masini ata manifinifi mo le fa'agaioia o ata ma fa'asalalauga fa'ailo.
  • Komepiuta ma Fa'aumau: Fa'aaogā mo ta'avale eletise, mea e manatua ai, ma fa'agaioiga fa'ailo i motherboards, servers, ma processors.

Taavale ma felauaiga:

  • Ta'avale Fa'aeletise (EVs): O mea fa'apipi'i ata manifinifi o lo'o tu'ufa'atasia i faiga fa'afoe o le maa mo le teuina o le malosi ma le fa'aliliuina o le eletise, fa'aleleia le fa'atinoga o le EV ma le lelei.
  • Automotive Electronic Systems: I infotainment system, navigation system, taʻavale fesoʻotaʻiga, ma faiga saogalemu, masini ata tifaga e faʻaaogaina mo le faʻamamaina, faʻapipiʻi, ma le faʻaogaina o faailo.

Malosiaga ma Malosiaga:

  • Malosiaga Fa'afouina: Fa'aaogaina i paneta o le la ma le malosi o le matagi mo le fa'amalieina o le gaosiga o le galu ma fa'aleleia atili le fa'aliliuina o le malosi.
  • Malosiaga Fa'aeletonika: I masini e pei o inverters, converters, ma voltage regulators, capacitors manifinifi ata e fa'afaigaluega mo le teuina o le malosi, fa'alelei i le taimi nei, ma tulafono faatonutonu voltage.

Mea Fa'afoma'i:

  • Faʻataʻitaʻiga Faʻafomaʻi: I masini X-ray, faʻataʻitaʻiga faʻamaneta (MRI), ma masini ultrasound, faʻapipiʻi ata manifinifi e faʻaaogaina mo le faʻaogaina o faailo ma le toe faʻaleleia o ata.
  • Mea Fa'afoma'i Fa'atosina: O mea fa'apipi'i ata manifinifi e tu'uina atu ai le fa'atonutonuina o le paoa ma le fa'agaioiina o fa'amaumauga i masini e pei o le pacemakers, fa'apipi'i i totonu o le cochlear, ma biosensors fa'apipi'i.

Feso'ota'iga ma Feso'ota'iga:

  • Feso'ota'iga Fe'avea'i: O mea fa'apipi'i ata manifinifi o vaega taua ia i RF pito i luma modules, filiga, ma le fa'alogoina o le antenna mo nofoaga autu feavea'i, feso'ota'iga satelite, ma feso'ota'iga uaealesi.
  • Nofoaga Autu o Fa'amaumauga: Fa'aaogaina i feso'ota'iga feso'otaiga, alalaupapa, ma sapalai mo le puleaina o le eletise, teuina o fa'amaumauga, ma le fa'atulagaina o faailoilo.

Aotelega, o masini ata tifaga manifinifi e faia ni matafaioi taua i pisinisi eseese, e maua ai le lagolago taua mo le faʻatinoga, mautu, ma le faʻaogaina o masini eletise. A'o fa'aauau pea le aga'i i luma o tekonolosi ma fa'alauteleina vaega o fa'aoga, o lo'o fa'amoemoeina pea le va'aiga i le lumana'i mo capacitors ata manifinifi.


  • Muamua:
  • Sosoo ai:

  • Malosi Fa'atatau Cn (uF) W±1 (mm) H±1 (mm) B±1 (mm) P (mm) P1 (mm) d±0.05 (mm) dv/dt (v/us) (A) tan d(x10-4) ESR ile 10kHz (mΩ) Imax (A) Oloa Nu.
    1kHz 10kHz
    500Vdc /85℃ 30 32 37 22 27.5 10.2 0.8 50 1100 10 100 6.2 14.5 MDP501306*032037LRY
    40 42 40 20 37.5 10.2 1 20 600 20 190 7.7 13.9 MDP501406*042040LSY
    50 42 37 28 37.5 10.2 1 20 800 20 190 6.6 17.3 MDP501506*042037LSY
    55 42 44 24 37.5 10.2 1 20 800 20 190 6.2 19.1 MDP501556*042044LSY
    70 42 45 30 37.5 20.3 1.2 20 1100 20 190 5.3 21.8 MDP501706*042045LSR
    80 42 46 35 37.5 20.3 1.2 20 1300 20 190 5 22.2 MDP501806*042046LSR
    90 42 50 35 37.5 20.3 1.2 20 1400 20 190 4.7 25 MDP501906*042050LSR
    120 42 55 40 37.5 20.3 1.2 20 1800 20 190 4 29.1 MDP501127*042055LSR
    150 42 62 45 37.5 20.3 1.2 20 2400 20 190 3.6 36.4 MDP501157*042062LSR
    100 57.5 45 30 52.5 20.3 1.2 12 960 33 320 5.9 15.5 MDP501107*057045LWR
    130 57.5 50 35 52.5 20.3 1.2 12 1200 33 320 4.8 20.1 MDP501137*057050LWR
    150 57.5 56 35 52.5 20.3 1.2 12 1440 33 320 3.3 23.2 MDP501157*057056LWR
    180 57.5 64.5 35 52.5 20.3 1.2 12 1800 33 320 2.7 27.9 MDP501187*057064LWR
    190 57.5 55 45 52.5 20.3 1.2 12 1800 33 320 2.6 29.4 MDP501197*057055LWR
    200 57.5 70 35 52.5 20.3 1.2 12 1920 33 320 2.4 31 MDP501207*057070LWR
    220 57.5 65 45 52.5 20.3 1.2 12 2280 33 320 2.2 34 MDP501227*057065LWR
    240 57.5 80 35 52.5 20.3 1.2 12 2280 33 320 2 34.9 MDP501247*057080LWR
    Malosi Fa'atatau Cn (uF) W±1 (mm) H±1 (mm) B±1 (mm) P (mm) P1 (mm) d±0.05 (mm) dv/dt (v/us) (A) tan d(x10-4) ESR ile 10kHz (mΩ) Imax (A) Oloa Nu.
    1kHz 10kHz
    600Vdc /85℃ 25 32 37 22 27.5 10.2 0.8 50 1250 10 100 6.2 12.4 MDP601256*032037LRY
    35 42 40 20 37.5 10.2 1 20 700 20 190 7.1 13 MDP601356*042040LSY
    40 42 37 28 37.5 10.2 1 20 800 20 190 6.3 14.2 MDP601406*042037LSY
    45 42 44 24 37.5 10.2 1 20 900 20 190 5.7 14.7 MDP601456*042044LSY
    60 42 45 30 37.5 20.3 1.2 20 1200 20 190 4.5 17.1 MDP601606*042045LSR
    70 42 46 35 37.5 20.3 1.2 20 1400 20 190 4.2 18.4 MDP601706*042046LSR
    80 42 50 35 37.5 20.3 1.2 20 1600 20 190 3.8 21 MDP601806*042050LSR
    100 42 55 40 37.5 20.3 1.2 20 2000 20 190 3.3 23.5 MDP601107*042055LSR
    130 42 62 45 37.5 20.3 1.2 20 2600 20 190 2.7 29.8 MDP601137*042062LSR
    85 57.5 45 30 52.5 20.3 1.2 12 1020 33 320 5.9 14.7 MDP601856*057045LWR
    110 57.5 50 35 52.5 20.3 1.2 12 1320 33 320 4.8 19 MDP601117*057050LWR
    130 57.5 56 35 52.5 20.3 1.2 12 1560 33 320 3.7 22.4 MDP601137*057056LWR
    160 57.5 64.5 35 52.5 20.3 1.2 12 1920 33 320 3 27 MDP601167*057064LWR
    160 57.5 55 45 52.5 20.3 1.2 12 1920 33 320 3 27 MDP601167*057055LWR
    170 57.5 70 35 52.5 20.3 1.2 12 2040 33 320 2.7 28.7 MDP601177*057070LWR
    200 57.5 65 45 52.5 20.3 1.2 12 2400 33 320 2.3 33.8 MDP601207*057065LWR
    210 57.5 80 35 52.5 20.3 1.2 12 2520 33 320 2.2 35 MDP601217*057080LWR
    Malosi Fa'atatau Cn (uF) W±1 (mm) H±1 (mm) B±1 (mm) P (mm) P1 (mm) d±0.05 (mm) dv/dt (v/us) (A) tan d(x10-4) ESR ile 10kHz (mΩ) Imax (A) Oloa Nu.
    1kHz 10kHz
    800Vdc /85℃ 18 32 37 22 27.5 10.2 0.8 50 900 10 100 7.2 12.4 MDP801186*032037LRY
    22 42 40 20 37.5 10.2 1 20 440 20 190 9.4 12.5 MDP801226*042040LSY
    30 42 37 28 37.5 10.2 1 20 600 20 190 7.3 17.1 MDP801306*042037LSY
    30 42 44 24 37.5 10.2 1 20 600 20 190 7.3 17.1 MDP801306*042044LSY
    40 42 45 30 37.5 20.3 1.2 20 800 20 190 5.8 20 MDP801406*042045LSR
    45 42 46 35 37.5 20.3 1.2 20 900 20 190 5.6 22.5 MDP801456*042046LSR
    55 42 50 35 37.5 20.3 1.2 20 1100 20 190 4.9 27.5 MDP801556*042050LSR
    70 42 55 40 37.5 20.3 1.2 20 1400 20 190 4.1 35 MDP801706*042055LSR
    90 42 62 45 37.5 20.3 1.2 20 1800 20 190 3.6 45.1 MDP801906*042062LSR
    60 57.5 45 30 52.5 20.3 1.2 12 720 33 320 7.3 16.7 MDP801606*057045LWR
    80 57.5 50 35 52.5 20.3 1.2 12 960 33 320 5.7 22.2 MDP801806*057050LWR
    90 57.5 56 35 52.5 20.3 1.2 12 1080 33 320 5.2 25 MDP801906*057056LWR
    110 57.5 64.5 35 52.5 20.3 1.2 12 1320 33 320 4.4 30.6 MDP801117*057064LWR
    110 57.5 55 45 52.5 20.3 1.2 12 1320 33 320 4.4 30.6 MDP801117*057055LWR
    120 57.5 70 35 52.5 20.3 1.2 12 1440 33 320 4.1 33.3 MDP801127*057070LWR
    130 57.5 65 45 52.5 20.3 1.2 12 1560 33 320 3.9 36.1 MDP801137*057065LWR
    140 57.5 80 35 52.5 20.3 1.2 12 1680 33 320 3.7 36.6 MDP801147*057080LWR
    Malosi Fa'atatau Cn (uF) W±1 (mm) H±1 (mm) B±1 (mm) P (mm) P1 (mm) d±0.05 (mm) dv/dt (v/us) (A) tan d(x10-4) ESR ile 10kHz (mΩ) Imax (A) Oloa Nu.
    1kHz 10kHz
    900Vdc /85℃ 14 32 37 22 27.5 10.2 0.8 50 700 10 100 7.9 14.9 MDP901146*032037LRY
    20 42 40 20 37.5 10.2 1 20 400 20 190 9.2 12.6 MDP901206*042040LSY
    25 42 37 28 37.5 10.2 1 20 500 20 190 7.7 15.7 MDP901256*042037LSY
    25 42 44 24 37.5 10.2 1 20 500 20 190 7.7 15.7 MDP901256*042044LSY
    35 42 45 30 37.5 20.3 1.2 20 700 20 190 5.9 22 MDP901356*042045LSR
    40 42 46 35 37.5 20.3 1.2 20 800 20 190 5.6 25.2 MDP901406*042046LSR
    45 42 50 35 37.5 20.3 1.2 20 900 20 190 5.2 28.3 MDP901456*042050LSR
    60 42 55 40 37.5 20.3 1.2 20 1200 20 190 4.3 37.8 MDP901606*042055LSR
    75 42 62 45 37.5 20.3 1.2 20 1500 20 190 3.7 47.2 MDP901756*042062LSR
    50 57.5 45 30 52.5 20.3 1.2 12 600 33 320 7.8 15.3 MDP901506*057045LWR
    65 57.5 50 35 52.5 20.3 1.2 12 780 33 320 6.2 19.9 MDP901656*057050LWR
    75 57.5 56 35 52.5 20.3 1.2 12 900 33 320 5.5 22.9 MDP901756*057056LWR
    90 57.5 64.5 35 52.5 20.3 1.2 12 1080 33 320 4.8 27.5 MDP901906*057064LWR
    90 57.5 55 45 52.5 20.3 1.2 12 1080 33 320 4.8 27.5 MDP901906*057055LWR
    100 57.5 70 35 52.5 20.3 1.2 12 1200 33 320 4.5 28.3 MDP901107*057070LWR
    110 57.5 65 45 52.5 20.3 1.2 12 1320 33 320 4.1 31.6 MDP901117*057065LWR
    120 57.5 80 35 52.5 20.3 1.2 12 1440 33 320 3.8 33 MDP901127*057080LWR
    Malosi Fa'atatau Cn (uF) W±1 (mm) H±1 (mm) B±1 (mm) P (mm) P1 (mm) d±0.05 (mm) dv/dt (v/us) (A) tan d(x10-4) ESR ile 10kHz (mΩ) Imax (A) Oloa Nu.
    1kHz 10kHz
    1000 Vdc /85 ℃ 11 32 37 22 27.5 10.2 0.8 50 550 10 100 9.2 13.3 MDP102116*032037LRY
    15 42 40 20 37.5 10.2 1 20 300 20 190 11.1 10.7 MDP102156*042040LSY
    20 42 37 28 37.5 10.2 1 20 400 20 190 9 14 MDP102206*042037LSY
    20 42 44 24 37.5 10.2 1 20 400 20 190 9 14 MDP102206*042044LSY
    25 42 45 30 37.5 20.3 1.2 20 500 20 190 7.5 17.8 MDP102256*042045LSR
    30 42 46 35 37.5 20.3 1.2 20 600 20 190 6.9 21.4 MDP102306*042046LSR
    35 42 50 35 37.5 20.3 1.2 20 700 20 190 6.2 24.9 MDP102356*042050LSR
    45 42 55 40 37.5 20.3 1.2 20 900 20 190 5.2 32.1 MDP102456*042055LSR
    55 42 62 45 37.5 20.3 1.2 20 1100 20 190 4.7 39.2 MDP102556*042062LSR
    40 57.5 45 30 52.5 20.3 1.2 12 480 33 320 9 13.8 MDP102406*057045LWR
    50 57.5 50 35 52.5 20.3 1.2 12 600 33 320 7.2 17.3 MDP102506*057050LWR
    60 57.5 56 35 52.5 20.3 1.2 12 720 33 320 6.2 20.7 MDP102606*057056LWR
    70 57.5 645 35 52.5 20.3 1.2 12 840 33 320 5.5 24.2 MDP102706*057064LWR
    70 57.5 55 45 52.5 20.3 1.2 12 840 33 320 5.5 24.2 MDP102706*057055LWR
    80 57.5 70 35 52.5 20.3 1.2 12 960 33 320 5 26.3 MDP102806*057070LWR
    90 57.5 65 45 52.5 20.3 1.2 12 1080 33 320 4.5 29.6 MDP102906*057065LWR
    90 57.5 80 35 52.5 20.3 1.2 12 1080 33 320 4.5 29.6 MDP102906*057080LWR
    Malosi Fa'atatau Cn (uF) W±1 (mm) H±1 (mm) B±1 (mm) P (mm) P1 (mm) d±0.05 (mm) dv/dt (v/us) (A) tan d(x10-4) ESR ile 10kHz (mΩ) Imax (A) Oloa Nu.
    1kHz 10kHz
    1100 Vdc /85 ℃ 8 32 37 22 27.5 10.2 0.8 50 400 10 100 10.7 10.5 MDP112086*032037LRY
    12 42 40 20 37.5 10.2 1 20 240 20 190 12.4 9.7 MDP112126*042040LSY
    15 42 37 28 37.5 10.2 1 20 300 20 190 10.3 12.3 MDP112156*042037LSY
    15 42 44 24 37.5 10.2 1 20 300 20 190 10.7 11.9 MDP112156*042044LSY
    20 42 45 30 37.5 20.3 1.2 20 400 20 190 8.3 16.4 MDP112206*042045LSR
    25 42 46 35 37.5 20.3 1.2 20 500 20 190 7 20.5 MDP112256*042046LSR
    28 42 50 35 37.5 20.3 1.2 20 560 20 190 6.4 23 MDP112286*042050LSR
    35 42 55 40 37.5 20.3 1.2 20 700 20 190 5.6 28.8 MDP112356*042055LSR
    45 42 62 45 37.5 20.3 1.2 20 900 20 190 4.8 37 MDP112456*042062LSR
    30 57.5 45 30 52.5 20.3 1.2 12 360 33 320 10.7 11.8 MDP112306*057045LWR
    40 57.5 50 35 52.5 20.3 1.2 12 480 33 320 8.2 15.4 MDP112406*057050LWR
    45 57.5 56 35 52.5 20.3 1.2 12 540 33 320 7.3 17.8 MDP112456*057056LWR
    55 57.5 64.5 35 52.5 20.3 1.2 12 660 33 320 6.2 21.7 MDP112556*057064LWR
    55 57.5 55 45 52.5 20.3 1.2 12 660 33 320 6.2 21.7 MDP112556*057055LWR
    60 57.5 70 35 52.5 20.3 1.2 12 720 33 320 5.9 23.7 MDP112606*057070LWR
    70 57.5 65 45 52.5 20.3 1.2 12 840 33 320 4.9 24.9 MDP112706*057065LWR
    70 57.5 80 35 52.5 20.3 1.2 12 840 33 320 4.9 249 MDP112706*057080LWR
    Malosi Fa'atatau Cn (uF) W±1 (mm) H±1 (mm) B±1 (mm) P (mm) P1 (mm) d±0.05 (mm) dv/dt (v/us) (A) tan d(x10-4) ESR ile 10kHz (mΩ) Imax (A) Oloa Nu.
    1kHz 10kHz
    1200 Vdc /85 ℃ 7 32 37 22 27.5 10.2 0.8 50 350 10 100 10.7 12.1 MDP122076*032037LRY
    10 42 40 20 37.5 10.2 1 20 200 20 190 144 7.9 MDP122106*042040LSY
    12 42 37 28 37.5 10.2 1 20 240 20 190 12.3 9.8 MDP122126*042037LSY
    12 42 44 24 37.5 10.2 1 20 240 20 190 12.3 9.8 MDP122126*042044LSY
    15 42 45 30 37.5 20.3 1.2 20 300 20 190 10.3 11.3 MDP122156*042045LSR
    20 42 46 35 37.5 20.3 1.2 20 400 20 190 7.6 14.5 MDP122206*042046LSR
    22 42 50 35 37.5 20.3 1.2 20 440 20 190 7.1 16 MDP122226*042050LSR
    28 42 55 40 37.5 20.3 1.2 20 560 20 190 6.1 19.9 MDP122286*042055LSR
    35 42 62 45 37.5 20.3 1.2 20 700 20 190 5.1 21.4 MDP122356*042062LSR
    25 57.5 45 30 52.5 20.3 1.2 12 300 33 320 12 9.8 MDP122256*057045LWR
    35 57.5 50 35 52.5 20.3 1.2 12 420 33 320 9 13.4 MDP122356*057050LWR
    40 57.5 56 35 52.5 20.3 1.2 12 480 33 320 7.9 13.9 MDP122406*057056LWR
    45 57.5 64.5 35 52.5 20.3 1.2 12 540 33 320 7.3 16.7 MDP122456*057064LWR
    50 57.5 55 45 52.5 20.3 1.2 12 600 33 320 6.9 16.9 MDP122506*057055LWR
    55 57.5 70 35 52.5 20.3 1.2 12 660 33 320 6.5 18.2 MDP122556*057070LWR
    60 57.5 65 45 52.5 20.3 1.2 12 720 33 320 5.9 19.6 MDP122606*057065LWR
    60 57.5 80 35 52.5 20.3 1.2 12 720 33 320 5.9 19.6 MDP122606*057080LWR

    O MEA E FAI AI