Ifilimu Ewugqinsi vs Iziphikisayo Zefilimu Ezincane: Umehluko & Nezicelo ze-PCB

Isingeniso

Ukukhetha phakathi kwefilimu ewugqinsi uma kuqhathaniswa nezimelana nefilimu ezacile kumelela enye yezinketho ezibaluleke kakhulu ekwakhiweni kwe-PCB, okuthinta ngokuqondile ukunemba kwesifunda, ukuzinza okushisayo, nezindleko zokukhiqiza. Onjiniyela abaningi bagxila ngokukhethekile enanini lokumelana nosayizi wephakheji kuyilapho bebheka umehluko oyisisekelo wokukhiqiza onquma ukusebenza kwesikhathi eside.

Izinqamuli zefilimu eziwugqinsi zisebenzisa ama-conductive nama-paste aphrintiwe isikrini, kuyilapho izithasiselo zefilimu ezizacile zisebenzisa izendlalelo zensimbi ezifakwe i-vacuum. Lo mehluko wokukhiqiza udala izikhala zokusebenza ezinkulu ekubekezeleni, izinga lokushisa elilingana nesilinganiso, nezici zomsindo ezivimbela ukuphindaphinda kwedizayini ebizayo kanye nokwehluleka kwengxenye.

Yiziphi I-Thick Film Resistors?

Ukukhiqiza Process

Izinqamuleli zefilimu eziwugqinsi zisebenzisa ubuchwepheshe bokuphrinta kwesikrini ukuze zifake unamathisele okhonjisiwe kuma-substrates e-ceramic, okulandelwa ukudubula kwezinga lokushisa eliphezulu ku-850°C. Okunamathiselwe okuphikisayo kuqukethe i-glass frit, i-metal oxides, nama-organic binders akha ifilimu cishe ugqinsi lwama-micrometer angu-10-25 ngemva kokucwiliswa. Le nqubo ivumela ukukhiqizwa kwevolumu ephezulu ngokutshalwa kwempahla encane uma kuqhathaniswa nezinye izinhlobo zefilimu elincanyana.

Izinhlamvu zokusebenza

Ama-resistor ajwayelekile aqinile efilimu afinyelela ukubekezelelana okungu-±1% kuya ku-±5% ngama-coefficient okushisa asukela ku-±100 kuya ku-±200 ppm/°C. Isakhiwo se-granular paste sikhiqiza umsindo we-Johnson ophezulu uma kuqhathaniswa nezinhlobo zefilimu ezincane. Amanani okumelana aqala kuma-milliohms kuya kuma-megohms ayishumi, kanti izilinganiso zamandla zifinyelela ama-watts amaningana kumaphakheji amakhulu.

Izindleko Nobubanzi Bokusebenza

Inzuzo eyinhloko yobuchwepheshe bamafilimu aminyene ilele kwezomnotho zokukhiqiza. Ukuphrinta isikrini kudinga izinyathelo zenqubo ezimbalwa kunokufakwa kwevacuum, kunciphisa izindleko zokukhiqiza ngo-60-80%. Kodwa-ke, isendlalelo sokunamathisela esiwugqinsi sidala ukusatshalaliswa kwamanje okungalingani, okuholela kumabhendi amakhulu okubekezelela kanye nokukhukhuleka kwezinga lokushisa okukhawulela ukusetshenziswa kumasekhethi wokulinganisa ukunemba.

Yiziphi i-Thin Film Resistors?

Ukukhiqiza Process

Ukukhiqizwa kwe-resistor yefilimu encane kuhilela ukufutha noma ukuhwamukisa i-nichrome noma i-tantalum nitride kuma-substrate e-ceramic emakamelweni okuhlanza, okudala amafilimu anobukhulu obungu-0.01-0.1 micrometers. Ukusika nge-laser kulungisa amanani okumelana nezincazelo eziqondile ngokususa izinto ezisetshenziswayo kumaphethini alawulwayo. Le nqubo yokususa ivumela ukunemba okungavamile kodwa idinga imishini ekhethekile.

Izinhlamvu zokusebenza

Izinqamuleli zefilimu ezizacile ziletha ukubekezelelana okuqinile njengo-±0.01% ngama-coefficients okushisa aphakathi kuka-±5 kanye no-±50 ppm/°C. Isendlalelo sensimbi esifanayo sibonisa umsindo omncane kanye nokusabela okuhle kakhulu kwemvamisa ephezulu ngenxa yemiphumela ephansi ye-parasitic. Amanani okumelana atholakalayo ngokuvamile asukela kuma-ohms kuye kuma-megohms, nakuba ukuphatha amandla kuhlala kunomkhawulo uma kuqhathaniswa nokulingana kwefilimu ewugqinsi.

Ukunemba Izinzuzo

Ukufana kwesilinganiso se-athomu kwamafilimu afakwe isikhala esingenalutho kuchaza ukuzinza okuphakeme kwefilimu ewugqinsi uma kuqhathaniswa nokuqhathaniswa kwe-resistor yefilimu emincane. Naphezu kwezindleko zeyunithi ephakeme, izingxenye zefilimu ezizacile zinciphisa izidingo zokulinganisa kanye nokwehluleka okuhlobene nokukhukhuleka ezinhlelweni zokulinganisa. Umkhawulo oyinhloko uhilela ukuchithwa kwamandla, njengoba amafilimu amancane engakwazi ukubhekana nokucindezeleka okushisayo okungamelana nezingqimba zokunamathisela eziqinile.

Ifilimu Ewugqinsi vs Iziphikisayo Zefilimu Ezincane: Ukuqhathanisa Ukusebenza Okubalulekile

Ithebula libonisa ukuthi kungani ukukhethwa kwe-resistor yefilimu ejiyile vs ifilimu encane kuncike ezidingweni zohlelo lokusebenza kunentengo kuphela. Ukuzinza kwezinga lokushisa kuba yinto ebaluleke kakhulu ekusetshenzisweni kwezimoto nezimboni lapho izimo zezulu zihluka khona ngo-100°C noma ngaphezulu.

I-PCB Design Imiphumela ye-Thick Film vs Thin Film Resistors

Izindlela Zesiginali Enembile

Izinqamuleli zefilimu ezizacile zibonakala zibalulekile kumasekhethi ereferensi e-ADC, izigaba zokuphuma kwe-DAC, kanye nokulungiselelwa kwebhuloho le-Wheatstone lapho ukunemba kuthinta ngokuqondile ukufaneleka kokulinganisa. Imishini yezokwelapha namathuluzi aselabhorethri athembele ngokukhethekile kubuchwepheshe befilimu ezacile ngoba ukubekezelela okungu-±0.1% kugcina ukunemba kwesilinganiso ukuthi ezinye ifilimu eliwugqinsi azikwazi ukufana kukho konke ukuhlukahluka kwezinga lokushisa.

Izinhlelo zokusebenza ezizwelayo ezingeni lokushisa

Amanani aphansi e-TCR avimbela ukukhukhuleka kokumelana phakathi kwamazinga okushisa okusebenza. I-resistor yefilimu ezacile ene-±25 ppm/°C ishintsha kuphela u-0.0025% ngedigri Celsius, kuyilapho ifilimu ewugqinsi kokuthi ±200 ppm/°C ishintsha ngo-0.02% ngedigri ngayinye. Ezindaweni ezingaphansi kwezimoto ezihlangabezana nokusebenza okungu-125°C, lo mehluko uhumusheka ekuqongeleleni amaphutha angu-2.5% kumasekhethi okulungisa izinzwa.

Izidingo Zokuchithwa kwamandla

Izinqamuli zefilimu eziwugqinsi ziphatha imithwalo yamandla ephakeme kumaphakheji ahlangene, okuwenza afanelekele lezi zinhlelo zokusebenza:

• Umkhawulo wamanje womshayeli we-LED - Isendlalelo sokunamathisela esiqinile simelana nokusebenza okuqhubekayo kwezinga lokushisa eliphezulu ngaphandle kokuwohloka.
• Amanethiwekhi empendulo yokuphakelwa kwamandla - Ukuqaliswa okungabizi kakhulu lapho ukubekezelelana okungu-±5% kuhlangabezana nezidingo zomthetho.
• Ama-Digital pull-up resistors - Ukunemba okwanele kwencazelo yezinga le-logic ngokusetshenziswa okuncane kwendawo ye-PCB.
• Abashayeli besango lokulawula izimoto - Ukuzinza kwe-thermal ngaphansi kokushintsha ama-transients ngokuphathwa kwamandla aphezulu we-pulse.

High-Frequency kanye RF Circuits

Ukwakhiwa kwe-resistor yefilimu ezacile kunciphisa inductance ne-parasitic capacitance, kulondoloze ubuqotho besignali ngaphezu kuka-100 MHz. Ifilimu yensimbi efanayo igcina i-impedance engaguquki, kuyilapho ukwakheka kwefilimu ewugqinsi kwe-granular kwakha amaphuzu okubonisa kumafrikhwensi e-RF. Amanethiwekhi okuhlunga, amasekhethi afanayo ahambisanayo, namamojula e-5G adinga izingxenye zefilimu ezizacile zamapharamitha we-S abikezelwe nezici zokulibaziseka kweqembu.

Ukuhlaziywa Kwezindleko Nokwethenjelwa

Izindleko Zengxenye Yokuqala

Izinqamuleli zefilimu eziwugqinsi zehlisa izindleko ze-BOM ngo-70-85% uma ziqhathaniswa nezilinganiso zefilimu ezizacile, okudala ukonga okubalulekile emikhiqizweni yabathengi enevolumu ephezulu. I-resistor yefilimu ewugqinsi engu-0603 ibiza u-$0.002-0.005, kuyilapho okuhlukile kwefilimu ezacile kusuka ku-$0.015-0.030. Kodwa-ke, ukusatshalaliswa kokubekezelelana okubanzi kwandisa isikhathi sokulinganisa ngesikhathi sokuhlolwa kokukhiqiza.

Izindleko eziphelele zobunikazi

Ukuhlaziywa kokuqina kwesikhathi eside kukhombisa ukuthi izinto ezimelana nefilimu ezacile zigcina imininingwane iminyaka engu-20+ ngaphansi kwezimo ezilinganiselwe, kuyilapho ukusebenza kwefilimu ewugqinsi kwehla ngokulinganiselwe ngemva kweminyaka engu-10 ezindaweni ezinokhahlo. Izingxenye zefilimu ezizacile zivame ukuletha izindleko ezingcono eziphelele zobunikazi kumathuluzi anemba ngokususa izinyathelo zokulinganisa nokunciphisa ukwehluleka kwenkambu kusuka ekukhukhuleni. Izindleko zokuphikisa zimelela ngaphansi kuka-0.5% wezindleko eziningi zomhlangano we-PCB.

Izibonelo Isicelo

Izicelo Zefilimu Eminyene

I-Consumer electronics ithuthukisa ukumelana nefilimu ewugqinsi ekulawuleni amandla, ukudonsa okunengqondo kwedijithali, nesimo sesignali esivamile lapho ukubekezelela okungu-±5% kwanele:

• Amashaja ama-smartphone nama-adaptha amandla - Impendulo ye-voltage elungiselelwe izindleko kanye namasekhethi amanje okuzwa.
• Izinzwa ze-IoT - Isimo se-analog esingabalulekile esinokubekezelela i-coefficient ye-voltage enwetshiwe.
• Home Imishini - Izinhlelo ezijwayelekile ezibeka phambili ukwethembeka kunokunemba.
• Automotive body electronics -Izici zokunethezeka nokunethezeka ezinezidingo zokunemba ezimaphakathi.

Izicelo Zefilimu Elincane

Izinsimbi zezokwelapha zidinga ukumelana nefilimu emincane ukuze kuqashwe isiguli ukunemba nokunemba kokuxilonga. Amasistimu we-Aerospace acacisa izingxenye zefilimu ezizacile ukuze kugcinwe ukulinganiswa kwezinga lokushisa elidlulele ukusuka ku-55°C kuya ku-+125°C nokudlidliza kufika ku-20g. Imishini yokuhlola neyokulinganisa, imithombo yamanje enembayo, namamojula e-RF kuncike ekuzinzeni kwefilimu encane ukuze kulandeleke izilinganiso kanye nokuthobela imithetho.

Umhlahlandlela Wokukhetha Wobunjiniyela Wefilimu Eminyene vs I-Thin Film Resistors

Ungakhetha Nini Izinqamuleli Zefilimu Ezincane

• Amasekhethi ancike ngokunemba - Sebenzisa ifilimu elincanyana lapho ukunemba kwesifunda kuthonya ngokuqondile ukusebenza komkhiqizo, ukuqina kokulinganisa, noma ukuthobela ukuphepha.
• Imiklamo ezwelayo kumazinga okushisa - I-TCR ephansi ivimbela ukukhukhuleka kwesizini noma kokusebenza okungase kudlule isabelomali samaphutha ngokuhamba kwesikhathi.
• High-frequency noma RF izicelo - Ukwakhiwa kwefilimu ezacile kunciphisa i-parasitic inductance/capacitance futhi kusiza ukugcina i-impedance elawulwayo ngaphakathi ±1 Ω.
• Imikhiqizo yesikhathi eside - Kumadivayisi aqondise iminyaka engu-10+ yokuthembeka kwenkundla, ifilimu elincanyana linciphisa kakhulu ukwehluleka okuhlobene nokukhukhuleka kanye nezingozi zewaranti.

Ungakhetha Nini Izinqamuleli Zefilimu Eziminyene

• Amasekhethi edijithali anenhloso evamile - Kuyafaneleka lapho isikhathi, ukuqonda, nokusayina kungadingi ukunemba.
• Ukusabalalisa amandla kanye nezindlela zokulayisha - Izinqamuleli zefilimu eziwugqinsi zihlangabezana nezidingo zokusebenza lapho ukubekezelela okungu-±5% kwamukelekile.
• Imikhiqizo yabathengi enevolumu ephezulu - Ukukhetha okungabizi kakhulu lapho ukulingisa kwesekethe kuqinisekisa ukusebenza okwanele ngokunqwabelaniswa kokubekezelela okubi kakhulu.
• Izindlela zokujikeleza ezingabalulekile - Ilungele izindawo ezinomklamo ovulekile kanye nezidingo zokunemba okuphansi.

Izinyathelo Zokuqinisekisa Ezibalulekile Ngaphambi Kokukhetha Kokugcina

• Qinisekisa i-TCR yangempela - Hlola ukukhukhuleka phezu kwebanga lokushisa eligcwele lokusebenza kunokuthembela kuma-specs avamile.
• Hlola ukubekezelela uma kuqhathaniswa nesamba sebhajethi yephutha - Qinisekisa ukuthi ukupakisha kokubekezelelana okuhlanganisiwe kuhambisana nezidingo zesistimu.
• Hlola izici zomsindo - Ibalulekile kumzila we-analog, inzwa, nezindlela zesiginali ezisezingeni eliphansi.
• Gwema izinqumo zephakheji kuphela - Ukuziphatha kukagesi kuyahlukahluka kakhulu phakathi kwefilimu ewugqinsi nencane ngisho nangaphakathi kwendawo efanayo (isb, 0402, 0603, 0805).

Ukuqhathaniswa okunezigwegwe kwalezi zinhlaka kuqinisekisa ukuthi abaklami bakhetha ubuchwepheshe obuthembeke kakhulu futhi obungabizi kakhulu bokumelana nomsebenzi wesekethe ngayinye.

Isiphetho

Umthelela Wokusebenza we-Thick Film vs Thin Film Resistors

Ukukhetha phakathi kwefilimu ewugqinsi nobuchwepheshe bokumelana nefilimu encane kunquma ngokuqondile ukuthi ukusebenza kwesekethe kuhlala kuzinzile yini kuzo zonke izindawo zokukhiqiza, amazinga okushisa okusebenza, kanye nokusetshenziswa kwenkambu yesikhathi eside. Izinqamuleli zefilimu eziwugqinsi zinikeza ukusebenza okwanele kwezinhlelo zokusebenza zenhloso evamile ngezindleko ezincane, kuyilapho izinqamuleli zefilimu ezizacile ziletha ukunemba nokuzinza okudingekayo ekukalweni, kwezokwelapha, nasezinhlelweni ze-aerospace.

Umehluko oyisisekelo wokukhiqiza udala i-oda-of-magnitude inzuzo ekubekezeleleni kanye ne-TCR—okungaphezu kwalokho isinxephezelo sezinga lesifunda esingase sixazulule.

Izinto Ezibalulekile Onjiniyela Kumele Bazihlole

Onjiniyela kufanele bahlole imingcele emithathu ebalulekile lapho bekhetha ubuchwepheshe bokumelana:

• Ukunemba okudingekayo kulo lonke izinga lokushisa
• Ukukhukhuleka okwamukelekayo esikhathini sokuphila somkhiqizo oqondiwe
• Izindleko eziphelele ezihlanganisa ukulinganisa, isivuno, kanye nengozi yokwehluleka kwenkundla

Ukugwema Izingibe Ezivamile Zokukhetha

Ukukhetha izinqamuleli zefilimu eziwugqinsi zamasekhethi anembayo kwandisa izindleko zokulinganisa eziphindelelayo futhi kwethula izingozi zokwethenjelwa zesikhathi eside. Ngakolunye uhlangothi, ukucacisa izingxenye zefilimu ezizacile kumasekhethi lapho ukubekezelela okungu-±5% kunemiphumela eyanele ekusetshenzisweni kwemali okungadingekile ngaphandle kwezinzuzo zokusebenza eziphusile.

Kwa-Highleap Electronics, ithimba lethu lobunjiniyela linikeza isiqondiso sobuchwepheshe be-resistor kanye nokuhlolwa kwe-DFM ukuze kuthuthukiswe kokubili ukusebenza kanye nezindleko zokukhiqiza kuma-PCB assemblies akho.