Abanikeli be-SMD: inkcazo, ukumakisha

I-SMD (i-Surface Mounted Devices) ngesiNgesi kuthetha "isicatshulwa esisezantsi". Iimpawu ze-SMD zincinci ezili-10 ubukhulu kunye nobukhulu kunamalungu omthonyama, ngenxa yoko, ukunyamezela kokuphakama kwabo kwiibhodi zeesekethe eziprintiweyo zifezekileyo. Ngethuba lethu, i-electronics ikhula ngokukhawuleza, esinye sezikhokelo kukunciphisa ubukhulu bomlinganiselo kunye nobukhulu bezinto. Iimpawu ze-SMD - ngenxa yobukhulu bayo, ezishibhileyo, umgangatho ophezulu - ziye zanda kakhulu kwaye zanda ngokutshintsha izinto eziklasi kunye nezikhokelo zecingo.

Isithombiso esingezantsi sibonisa ukukhuseleka kwe-SMD kwi-PCB. Kuyabonakala ukuba, ngenxa yobukhulu becala bezinto, ukuxinwa okuphezulu kokuphakama kuye kwafezwa. Iziqendu eziqhelekileyo zifakwe emigodini ekhethekileyo ebhodini, kwaye i-SMD-resistors are soldered kwiindlela zokudibanisa (izikhonkwane) kwiphepha lebhodi yesiphaluza ephrintiweyo, elenza lula ukuphuhliswa kunye nendibano yezixhobo ze-radioelectronic. Ngombulelo lokuba unamathele ukufakelwa kweempawu zomsakazo, kwaba lula ukuvelisa iiplanga zeesekethe eziprintiweyo kungekhona nje ngokuphindwe kabini, kodwa kunye ne-multilayered, ngaphandle kokukhumbuza ngaphandle kwekheke elimnandi.

Kwimveliso yezoshishino, ukuxutywa kwezinto ze-SMD zenziwa ngolu hlobo lulandelayo: udidi olukhethekileyo lwe-soldering (i-flux exutywe kunye ne-solder powder) isetyenziselwa kwiindlela zokudibanisa zebhodi, emva koko i-robot inezinto ezifunekayo, kubandakanywa nabanikeli be-SMD. Iindawo zihambelana ne- solder paste, kwaye ibhodi ibelwa kwi-oven ekhethekileyo apho ichithwa khona kwiqondo lokushisa elifunekayo, apho i-solder idibene khona, i-flux iyangena. Ngale ndlela, iindawo zifanelekile endaweni. Emva koko, ibhodi yesiphaluka isuswe kwisithando somlilo kwaye selehlile.

Ukwenza izixhobo ezinjenge-SMD ekhaya, ufuna izixhobo ezilandelayo: iifake, i-awl, i-nippers, i-glass magnifying, i-syringe kunye nenaliti ende, isinyithi esinyeneyo kunye ne-sting esincinci, isitulo esitshisa umoya. Iimveliso zifuna i-solder, umbane wamanzi. Kuyacetyiswa ukuba, ngokuqinisekileyo, ukusebenzisa isitishi se- soldering, kodwa ukuba ungenayo, ungayifumana ngesinyithi se-soldering. Xa ukukhangela into ephambili kukuthintela ukugqithisa kwezinto kunye nebhodi yesiphaluza. Ukuqinisekisa ukuba izinto azihambelanga kwaye zingabambeleli kwintsimbi yokuxutywa, kufuneka zixinzezelwe kwibhodi ngenaliti.

I-SMD-resistorsors iboniswe ngokubanzi kwiindidi ezininzi zokubaluleka: ukusuka kwi-Ohm ukuya kwi-megaohm engamashumi amathathu. Ukushisa okusebenzayo kwabanqandezi bafana -550 ° C ukuya kwi-1250 ° C. Amandla abanikeli be-SMD afika ku-1 W. Ngamandla anokunyuka, ubukhulu becala buyanda . Ngokomzekelo, abaxhasi be-SMD balinganiswe kwi-0.05 W banamanani aphezulu ka-0.6 * 0.3 * 0.23 mm, kwaye amandla a-1 W ngu-6.35 * 3.2 * 0.55 mm.

Ukumakishwa kwabaxhatshazi banjalo ziintlobo ezintathu: ngeenombolo ezintathu, kunye neenombolo ezine kunye neempawu ezintathu:

- Iimpawu ezimbini zokuqala zibonisa ukubaluleka kwexabiso lokuxhathisa kwi-Ohm, kunye neyokugqibela-inani lezerosi. Ngokomzekelo, ukumakishwa kumlingo 102 kuthetha 1000 Ω okanye 1 kΩ.

- Iinqalo zokuqala ezintathu ezichasayo zibonisa ixabiso lokuqeshiswa kwi-Ohm, kwaye iyokugqibela-inani lezerosi. Ngokomzekelo, ukumakishwa kumlingo 5302 kuthetha 53 kΩ.

- Iimpawu zokuqala ezimbini ezichasayo zibonisa ixabiso lokuqeshiswa kwi-Ohm, ethathwe kwitheyibhile elingentla, kwaye umgca wokugqibela ubonisa inani lokuphindaphinda: S = 10-2; R = 10-1; B = 10; C = 102; D = 103; E = 104; F = 105. Ngokomzekelo, ukumakishwa kwinqanaba 11C kuthetha 12,7 kΩ.