Qhov yooj yim txhais ntawm qhov sib txawv ntawm ob yog tias ib tug tsis siv txhuas, thaum lwm tus ua. Txawm li cas los xij, muaj qee qhov sib txawv ntawm HASL nrog txhuas thiab HASL yam tsis muaj txhuas tiav.
Cov hauv qab no yog qee yam uas ua rau muaj qhov sib txawv:
1. Thickness ntawm kev txhawb nqa
Lub thickness ntawm lub rooj tsavxwm ua rau qhov sib txawv ntawm HASL nrog txhuas thiab HASL yam tsis muaj hlau lead. Kev them nyiaj yug PCB tuab ntawm 25.4µm thiab 50.8µm; Qhov sib txawv ntawm cov hlau lead-dawb txhawb cov thicknesses ntawm 2.54µm thiab 25.4µm.
2. Tus nqi kho mob nto
Lead-free HASL muaj tus nqi nruab nrab piv rau lwm cov PCB tiav xws li ENIG thiab HASL. Nws tsis tshua kim dua li ENIG nto kho thiab me ntsis kim dua li cov txheej txheem HASL ib txwm.
3. Khoom
Cov khoom lossis muaj pes tsawg leeg kuj ua rau ob qhov sib txawv; HASL txhuas siv cov tin thiab txhuas, thaum tsis muaj hlau lead HASL siv ntau tin thiab tooj liab.
4. Cov ntawv thov ib txwm
Qhov saum npoo tiav ntawm HASL txhuas yog qhov zoo tagnrho rau siv hauv Circuit Court boards qhov twg yuav tsum muaj thickness ntau dua. Piv txwv li, nws tuaj yeem siv rau cov khoom siv hluav taws xob yooj yim / ib txwm siv hluav taws xob hluav taws xob (FR4) PCBs, tshwj xeeb tshaj yog cov ntau dua 0.5 hli tuab.
HASL kev kho qhov chaw tsis muaj hlau lead tuaj yeem siv rau cov khoom siv hluav taws xob nrog lub thickness tsawg dua 0.5 hli. Ib qho piv txwv yog rigid printed circuit boards (PCBs).
5. Kev ceev faj txog kev nyab xeeb
Nws tsis muaj txiaj ntsig rau kev siv cov khoom uas ua rau muaj kev puas tsuaj rau tib neeg lossis ib puag ncig. qhov no yog rooj plaub nrog HASL coj PCB tiav, uas siv cov hmoov txhuas ua ib qho ntawm lawv cov yam ntxwv. Qhov no ua rau lub cev raug mob thiab tuaj yeem ua rau muaj teeb meem ib puag ncig.
Qhov tsis sib xws yog rooj plaub uas tsis muaj hlau lead-dawb HASL tiav, uas tsis siv cov hlau lead ua ib qho ntawm cov hlau nplaum. Qhov no ua rau nws muaj kev nyab xeeb dua rau tus neeg siv nws thiab ib puag ncig uas nws siv.
6. Melting point
Ib yam li HASL tsis muaj txhuas siv qhov kub siab dua, qhov no kuj txhais tau tias ntau lub sijhawm yuav tsum dhau mus ua ntej nws cov solder melts. Nyob rau hauv sib piv, nrog rau HASL txhuas tiav, lub solder melts sai npaum li cas.
7. Kev nthuav qhia
Kev nthuav qhia ntawm kev kho saum npoo kuj txawv ntawm HASL tsis muaj txhuas thiab HASL coj. Feem ntau, HASL nto tiav ua tiav ntawm cov hlau lead thiab cov tin muaj qhov sib cuam tshuam zoo dua vim qhov ci ntsa iab thiab ci ntsa iab ntawm cov khoom.
Hauv qhov sib piv, HASL tsis muaj txhuas ua tiav yuav zoo li npub thaum siv rau ntawm PCBs.
