SMD-resistors: incazelo, ukufaka

SMD (Kwengaphandle egibele yedivayisi ') elihunyushwe ngokuthi English lisho "kudivayisi ogibele kwamanzi." SMD-izingxenye ezincane izikhathi eziyishumi ubukhulu nesisindo kuka izingxenye ezivamile, kanjalo ekufinyeleleni kwabantu ephakeme ka obandayo kwi ephrintiwe wesifunda ibhodi amadivaysi. Namuhla electronics athuthukile ijubane okukhulu, yezindawo - ukunciphisa Ubukhulu jikelele nesisindo amadivaysi. SMD-izingxenye - ngenxa yobukhulu bawo, izindleko ongaphakeme, high - got a ukusabalala omkhulu futhi ziya ziba mandla esikhundleni izakhi classical ngocingo imikhondo.

Isithombe ngezansi ikhombisa SMD-resistors ezibekwe phezu PCB. Ungabona ukuthi, ngenxa ubukhulu encane izakhi lifinyelele okusezingeni eliphezulu nokupakisha kwabantu. Ngokuvamile izinto ezifakwa emigodini ebhodini kanye SMD-resistors kuthiwa soldered indawo phezu onyathelisiwe wesifunda ibhodi contact izindlela (ngengulube), nakho lula design nasemhlanganweni amadivayisi umsakazo-elekthronikhi. With ikhono ukukhweza ukunamathela izingxenye umsakazo senziwa ukuba kunyatheliswe wesifunda amabhodi ephrintiwe akuzona kuphela zamazwe amabili, kodwa futhi multi-egqinsiwe, nibonakala sifana ikhekhe ungqimba.

ezivezwa indlela elandelayo kwezinga lemikhiqizo yezimboni nokunamathisela ngomthofu SMD-izingxenye: ibhodi ithrekhi ukuxhumana solder isicelo thermopaste ekhethekile (ecucuza ixubene solder powder), ngemva kwalokho robot unendawo izakhi oyifunayo kuhlanganise SMD-resistors. Yekuchumana zithobele nokunamathisela solder ke ibekwe endaweni ophethe ekhethekile eziko lapho sishisiswe izinga lokushisa oyifunayo lapho solder liyancibilika unama iyasha yokucucuza. Ngakho imininingwane uthole esihlalweni. Ngemva kwalokho, PCB esuswa esithandweni futhi selehlile.

Ukuze nokunamathisela ngomthofu izingxenye SMD uhlobo ekhaya kuzodingeka amathuluzi ezilandelayo: amashiya, usungulo, impintshisi, esikhombe isipetu ngenaliti obukhulu, yensimbi nokunamathisela ngomthofu nge ithiphu esihle, hot air nokunamathisela ngomthofu esiteshini. Of okudlekayo kwakudingeka solder, ecucuza ketshezi. Kuyinto efiselekayo Yiqiniso, ukusebenzisa esiteshini nokunamathisela ngomthofu, kodwa uma ungangiboni, ungathola by ngensimbi nokunamathisela ngomthofu. Lapho nokunamathisela ngomthofu into esemqoka - ukuvimbela okweqile izingxenye kanye PCB. Ukuze izakhi abahambanga futhi akazange wanamathela udosi insimbi nokunamathisela ngomthofu, kufanele agxishiwe ebhodini inaliti.

SMD-resistors presents ngempela anhlobonhlobo amagugu okuzisholo komunye ukuze amathathu Ohm megohm. Operating lokushisa resistors kuhluka -550 ° C kuya + 1250 ° C. Amandla SMD-Resistor ifinyelela 1 iviki. Ngokwandisa amandla ukwandisa izilinganiso jikelele. Ngokwesibonelo, resistors SMD amandla 0.05 W unamahlangothi 0.6 * 0.3 * 0.23 mm kanye amandla 1 W - 3.2 * 6.35 * 0.55 mm.

Ukumaka lezi resistors kungaba izinhlobo ezintathu:-enamadijithi amathathu, enamadijithi amane nezinhlamvu ezintathu:

- Izinombolo ezimbili zokuqala abonisa ukubaluleka kwengosi kuba value Resistor e ohms, kanti owokugcina uyoba ngo - inani amaqanda. Ngokwesibonelo, kwaba ukuqala ngaleso Resistor 102 kuyinto ohms 1000 noma 1k.

- Izinombolo ezintathu zokuqala Resistor kubonisa ukubaluleka okuzisholo e ohms, kanti owokugcina uyoba ngo - inani amaqanda. Ngokwesibonelo, esiwuphawu Resistor 5302 kuyinto 53 kohm.

- Elokuqala izinhlamvu ezimbili zibonisa ukubaluleka Resistor e ohms Inani okuzisholo, othathwe lelingenhla, futhi uhlamvu lokugcina kubonisa value Okuphindaphinda: S = 10-2; R = 10-1; B = 10; C = 102; D = 103; E = 104; F = 105. Ngokwesibonelo, esiwuphawu 11C Resistor kuyinto 12.7 kohm.