Nkag siab Spark's Damage To PCB

Semiconductor manufacturers muab qhov tseem ceeb rau hluav taws xob overload (EOS) thiab electrostatic paug (ESD). Ua ntej, rau cov laj thawj pom tseeb, EOS thiab ESD tuaj yeem ua rau cov khoom puas thaum lub sijhawm tsim khoom, ntim khoom, sib dhos, thiab kev sim. Tab sis qhov tseem ceeb tshaj, cov kev tsis zoo no yuav cuam tshuam ncaj qha rau kev ua haujlwm zoo thiab kev pabcuam lub neej ntawm circuits hauv tes ntawm cov neeg siv khoom.

Thaum pib, qhov uas raug hluav taws xob ntau dhau yuav tshwm sim ua haujlwm zoo. Tej zaum nws yuav txawm khiav hauv ib qho me ntsis degraded, tab sis tseem dhau qhov tsis siv neeg kuaj cov cuab yeej (ATE) tshuaj xyuas, tab sis tom qab ntawd ua tsis tiav ntawm qhov chaw. EOS thiab ESD tsis ua haujlwm yog tiv thaiv tau thiab yog qhov tseem ceeb ntawm kev tswj xyuas cov teeb meem zoo.

EOS thiab ESD kev puas tsuaj feem ntau yuav tshwm sim qhov twg ICs raug tsim thaum tsim khoom. Daim duab A qhia txog daim duab schematic ntawm PCB. Tej zaum peb yuav xav tias IC yog kev tiv thaiv los ntawm ib lub capacitor series. Qhov no tsis yog li ntawd. Qhov thib ob lub sijhawm los ua kev puas tsuaj yog rau cov neeg siv khoom mount IC ntawm PCB los tsim cov khoom. Saib ze ntawm daim duab 1B, peb tuaj yeem pom tias lub capacitor muaj qhov ua haujlwm voltage ntawm 50 V, tab sis qhov kev ncua deb ntawm ob qhov kawg ntawm cov hlau txuas tsuas yog 0.28 ntiv tes (7 hli). Txij li thaum lub txim tau dhia 0.4 ntiv tes (1 cm), qhov sib txawv me me nyob ib ncig ntawm lub capacitor tau yooj yim puas. Qhov tshwm sim yuav yog IC lub neej (Daim duab C). Thaum kawg, thaum cov neeg siv khoom siv cov khoom lag luam hauv lawv ib puag ncig, EOS lossis ESD kev puas tsuaj yuav tshwm sim.

Tau kawg, muaj ntau lub sijhawm rau kev poob loj. Peb tuaj yeem pom qhov tshwm sim ntawm EOS thiab ESD kev puas tsuaj hauv IC. Vim li no, cov khoom epoxy ntawm lub ntim yuav tsum raug tshem tawm. Qhov no feem ntau yog ua nrog cov kua qaub kub hauv lub thawv ob lub hnab looj tes. Cov txheej txheem no yog qhov txaus ntshai heev. Cov pa luam yeeb tuag taus. Ib qho pa tuaj yeem ua rau mob tuag taus. Muab cov kua qaub tso rau ntawm ib tus neeg ntawm daim tawv nqaij tsuas yog ua rau kev txiav ntawm tes lossis caj npab, thiab txawm tias qhov kev tuag loj tshaj plaws.