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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Hi all. Just noticed something interesting. Upon striking an arc using ccfl inverter from one data pin to the case of a dead PIC 12C508 I noticed that it was possible to "etch" away the casing leaving a hole where the epoxy was carbonised. You would expect the chip to be absolutely fried to a crisp but my meter suggests that the data pins are intact and measure near identical voltage drops to Vcc and Gnd as before it was cooked. I also tried removing the remaining epoxy with a UV laser and this might offer a less damaging option than the HV for that last millimetre.
Obviously to prevent the chip being nuked you need to ground all pins with copper, just to make sure I'd also add a guard rail to prevent the current path intersecting the silicon.
any ideas? regards, -A
"Bother" said Pooh, as Element 122 turned out to be a sensor glitch...
Registered Member #2261
Joined: Mon Aug 03 2009, 01:19AM
Location: London, UK
Posts: 581
We have a post here somewhere describing a professional method of burning though an IC package using single drops of fuming nitric acid alternating with acetone washes.
Registered Member #1951
Joined: Sun Feb 01 2009, 01:59PM
Location:
Posts: 105
Patrick wrote ...
R v.d. Tuuk wrote ...
intresting:
but i think it's more damaging..
perhaps a 1kT nuclear weapon would do less damage then the hammer method.
he was inpatient, if he torched it long enough, the casing would have gone in piece, he decided to hammer it. besides i posted it to show that you can actually torch the casing off!
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Etching away chip casings with HV?
