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decap:laser [2023/09/04 07:46] – mcmasterdecap:laser [2025/01/30 03:43] (current) – mcmaster
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 TLDR: bulk material for standard packages can be removed using a fiber laser. However, a CO2 laser will not work (lower peak power => melts silica instead of ablating it). However the laser will damage the die surface if you try to go all the way to the surface (without using a special setup like FALIT). Finally, COB epoxy appears to be workable even with a CO2 laser TLDR: bulk material for standard packages can be removed using a fiber laser. However, a CO2 laser will not work (lower peak power => melts silica instead of ablating it). However the laser will damage the die surface if you try to go all the way to the surface (without using a special setup like FALIT). Finally, COB epoxy appears to be workable even with a CO2 laser
 +
 +Promising results: https://www.reddit.com/r/EngineeringPorn/comments/1icord2/comment/m9xy7ll/?context=3&share_id=i1YZrBEW-XINfaIcKmh4u&utm_content=1&utm_medium=ios_app&utm_name=ioscss&utm_source=share&utm_term=1
 +  * What sort of laser did you use? How did you stop it from obliterating the die?
 +  * Just a cheap laser off AliExpress. 3.5 watt 445nm output. Powerful enough to burn epoxy away (and the bond wires) but not powerful enough to burn silicon.
  
 General results General results
decap/laser.1693813610.txt.gz · Last modified: 2023/09/04 07:46 by mcmaster