John McMaster writes:
Many people use concentrated acids to decapsulate ICs. One alternative is to heat them up to a high temperature and then drop them to a low temperature quickly. The high temperature was supplied by a butane torch and the cold temperature from a salted ice water bath. From the brief experiments I did today, the ideal chip seems to be large, have a metal plate (large expansion constant difference), and have a passivation layer that expands under heat (pushes epoxy off of die). This chip has all three and was decapsulated in less than a minute. It does have some small amount of residue on it, but chips can be cleaned in various ways.
Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.
Join us every Wednesday night at 8pm ET for Ask an Engineer!
Learn resistor values with Mho’s Resistance or get the best electronics calculator for engineers “Circuit Playground” – Adafruit’s Apps!
Maker Business — Transforming Today’s Bad Jobs into Tomorrow’s Good Jobs
Wearables — Not a loophole
Electronics — Rule of thumb: 10mils per amp.
Biohacking — Soft Artificial Human Heart #3DThursday #3DPrinting
Sorry, the comment form is closed at this time.