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decap:epoxy [2020/02/27 20:57] – mcmasterdecap:epoxy [2023/09/04 07:42] (current) – mcmaster
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 ===== McMaster live 2019-11-10 ===== ===== McMaster live 2019-11-10 =====
  
-{{:mcmaster:decap:epoxy:cob_silicone.jpg?600|}}+{{:mcmaster:decap:epoxy:cob_silicone.jpg?400|}}
  
 Experiments trying to decap COB while keeping PCB intact Experiments trying to decap COB while keeping PCB intact
 +
  
 TLDR best result TLDR best result
Line 150: Line 151:
  
 Above is a compromise between PP providing the best chemical resistance and silicone providing the best seal Above is a compromise between PP providing the best chemical resistance and silicone providing the best seal
 +
 +{{:mcmaster:decap:epoxy:silicone_surface.jpg?400|}}
 +
 +Above: hardened silicone bubbles on WFNA surface
  
 Silicone only experiment Silicone only experiment
Line 157: Line 162:
     * Interesting, but not what I was looking for     * Interesting, but not what I was looking for
   * Acid may eventually undermine the PCB, but eating the silicone itself came first   * Acid may eventually undermine the PCB, but eating the silicone itself came first
 +  * Consider using a lot more silicone than you need to help mitigate acid splashes
 +    * Maybe cover board surface with kapton?
  
 Someone also suggested I should try PTFE gasket. In the past I had tried kapton which didn't work well (acid tended to wick into kapton). Maybe PTFE would repel acid better Someone also suggested I should try PTFE gasket. In the past I had tried kapton which didn't work well (acid tended to wick into kapton). Maybe PTFE would repel acid better
  
 +Reference: https://twitter.com/johndmcmaster/status/1193807272171827200
  
 ====== Live analysis considerations ======  ====== Live analysis considerations ====== 
Line 169: Line 177:
 ====== Laser ======  ====== Laser ====== 
  
-General results +[[decap:laser]]
-  * Some settings work decent +
-    * Possibly COB epoxy is easier to laser than package epoxy +
-  * Risk of melting bond wires and/or die +
-    * Use lower power and/or pulsed? +
-  * Practice on samples before trying something you care about +
-  * Puts off nasty fumes. Make sure to have good ventilation +
- +
-From Sam Wagner: +
-  * "We use a yterrbium fiberlaser. What you are doing is trying to cause the plastic compound to explosively eject the silicon beads. So a pulsed laser is critical.  The laser melts the plastic and the pulse hopefully causes it to vaporize and eject beads." +
-  * "Important to note that if you see silicon, you’ve destroyed the chip and can now no longer do FA work. We stop at the bond wires and use acid or plasma to remove the rest. Then it’s off to SEM or TIVA/LIVA or whatever you’re next step is." +
- +
- +
-===== jamiecraig ===== +
- +
-{{:decap:epoxy:laser_chip_p8211261.jpg?400|}} +
- +
-Above: laser decap from below ([[https://www.jamiecraig.com/wp-content/uploads/2015/08/P8211261.jpg|Source]]) +
- +
-https://www.jamiecraig.com/de-encapsulating-ics-with-a-laser-cutter/ +
-  * Seemed to work okay +
-  * What would it look like if touched up with WFNA? +
- +
-===== EMSL 6502 test ===== +
- +
-{{:decap:epoxy:img_20180227_101636.jpg?400|}} +
- +
-Above: poor results. Maybe from CO2 laser (source: photo by mcmaster from EMSL test) +
- +
-===== Silicon Exposed ===== +
- +
-{{:azonenberg:laser_08_df_neo10x_annotated.jpg?400|}} +
- +
-Above: [[http://siliconexposed.blogspot.com/2013/08/laser-ic-decapsulation-experiments.html|source]] +
- +
-http://siliconexposed.blogspot.com/2013/08/laser-ic-decapsulation-experiments.html +
-  * Poor results +
-  * Cranberry glass +
- +
-===== Laser Decap Pro ===== +
- +
-{{:decap:epoxy:laser:hiroyuki_nagahora.jpg?400|}} +
- +
-https://www.youtube.com/watch?v=-x4lyX1C4q0 +
-  * Gold backing block +
-  * Good leadframe exposure +
-  * Die unclear how well exposed +
-  * Scanned entire chip (including die area) up until the end +
-  * Raster scan is horizontal, vertical, and diagonal +
- +
-===== Sesame 1000 ===== +
- +
-{{:decap:epoxy:laser:sesame1000_ip.jpg?400|}} +
- +
-{{:decap:epoxy:laser:sesame1000_done.jpg?400|}} +
- +
-https://www.youtube.com/watch?v=2HMocYiwMYc +
-  * Cavity into pic +
-  * Gives a close up at the end +
- +
-===== CLC ControlLaser FALIT ===== +
- +
-{{:decap:epoxy:laser:clc_gui.jpg?400|}} +
-{{:decap:epoxy:laser:clc_gui2.jpg?400|}} +
-{{:decap:epoxy:laser:clc_gui3.jpg?400|}} +
-{{:decap:epoxy:laser:clc_gui4.jpg?400|}} +
- +
-https://www.youtube.com/watch?v=SvWgSs2_f00 +
-  * Laser Decapsulation FALIT System Software | Image Templates +
-  * Pro system demo +
-  * Has nice features like overlaying x-ray, CSAM, or other guiding image +
-  * Laser scan was horizontal, vertical mix +
- +
-===== Light Ray ===== +
- +
-{{:decap:epoxy:laser:light_ray.jpg?400|}} +
- +
-https://www.youtube.com/watch?v=sSRl3Vqbos8 +
-  * They do the whole chip but avoid die area +
-  * Light Ray - IC Decapsulation +
- +
- +
-===== mcmaster ezlaze ===== +
- +
-TODO: add pictures, estimate material removal rate+
  
-Basically this was too slow to be practical except for very small samples. That said, it did work very well. A quicklase or other higher throughput Nd:YAG system would likely work well 
  
 ====== Sandblast ====== ====== Sandblast ======
decap/epoxy.1582837054.txt.gz · Last modified: 2020/02/27 20:57 by mcmaster