SMD-resistors: description, lakabtawa

SMD (da Surface saka na'urorin ') ya fassara zuwa Turanci nufin "wani na'urar saka a farfajiya." SMD-gyara goma sau karami a size da kuma nauyi fiye da na al'ada sassa, game da shi, da cimma hakan yawa daga hawa a kan wani buga kewaye hukumar na'urorin. Yau lantarki ɓullo da gagarumin taki, daya daga cikin yankunan - shi ne don rage overall girma da kuma nauyi na na'urorin. SMD-aka gyara - saboda su size, low cost, high quality - samu wata babbar baza da suna ƙara maye gurbin gargajiya abubuwa da waya take kaiwa.

A hoto a kasa ya nuna da SMD-resistors aka sanya a kan PCB. Za ka iya ganin cewa, saboda da kananan girman da abubuwa cimma wani babban shiryawa yawa. Yawancin lokaci da abubuwa ana saka a cikin ramuka a cikin jirgin da kuma SMD-resistors ake soldered da wuri a kan surface na buga kewaye hukumar lamba hanyõyi (Piglet), wanda kuma simplifies da zane da kuma taro na rediyo-na'urorin lantarki. Tare da ikon zuwa Dutsen da aka makala na rediyo aka gyara aka sanya yiwu, don samar da buga kewaye allon ba kawai dangantakar, amma kuma Multi-mai lebur, zahiri kama wani Layer cake.

samar da wadannan hanya a masana'antu samar soldering SMD-aka gyara: waƙar hukumar a tuntube solder amfani musamman thermopaste (juyi da ya garwaya da solder foda), bayan da robot yana da wani wuri da ake so abubuwa ciki har da SMD-resistors. Details bi da solder manna da aka sa'an nan sanya a cikin wani na musamman cajin tanda inda aka kona wa ake so zafin jiki a da solder melts a cikin manna evaporates juyi. Kamar wancan ne da bayani samu a cikin wurin zama. Bayan nan, da PCB aka cire daga matoya, kuma sanyaya.

Domin soldering SMD irin aka gyara a cikin gida za su bukatar da wadannan kayayyakin: hanzaki, wani AWL, filaya, girmamãwa gilashin sirinji tare da wani lokacin farin ciki allura, a soldering baƙin ƙarfe da lafiya tip, zafi iska soldering tashar. Na kaya da ake bukata solder, ruwa juyi. Yana da kyawawa, ba shakka, yi amfani da soldering tashar, amma idan ba ka aikata ba, za ka iya samun ta da wani soldering baƙin ƙarfe. Lokacin da soldering babban abu - don hana zafi fiye da kima na gyara da kuma PCB. Don da abubuwa ba matsawa kuma bai makale da harba wata soldering baƙin ƙarfe, su ya kamata a guga man a kan allura jirgin.

SMD-resistors buga quite mai fadi da kewayon maras dabi'u daga daya zuwa talatin Ohm megohm. Operating zafin jiki na resistors dabam daga -550 ° C zuwa + 1250 ° C. Ikon SMD-resistor kai 1W. By kara da ikon kara da overall girma. Alal misali, resistors SMD ikon 0.05 W yana da girma 0.6 * 0.3 * 0.23 mm da kuma wani ikon 1 W - 3.2 * 6.35 * 0.55 mm.

Sa alama wadannan resistors iya zama na uku iri: uku-lambobi, hušu zuwa takwas kuma uku haruffa:

- Na farko biyu lambobi nuna darajar da resistor darajar a ohms, kuma na karshe - yawan zeros. Alal misali, sa alama a resistor 102 ne 1000 ohms ko 1k.

- Na farko uku lambobi na resistor nuna maras muhimmanci darajar a ohms, kuma na karshe - yawan zeros. Alal misali, lamarin da ya resistor 5302 ne 53 kohm.

- Na farko biyu haruffa nuna resistor darajar a ohms maras muhimmanci darajar, dauka daga cikin tebur a sama, da kuma karshe hali ya nuna wani multiplier darajar: S = 10-2. R = 10-1. B = 10; C = 102; D = 103; E = 104; F = 105. Alal misali, lamarin da ya resistor 11C ne 12.7 kohm.