26/01/2021 IC TESTING - DCAClab Blog
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IC TESTING Application Explained
December 18, 2017 · Samir Sabri · 2 Comments
The IC is nothing but a small chip containing the very large and
complicated circuit. The di erent circuit components are
generated in a semiconductor material with the help of CMOS
Technology. An IC (Integrated Circuit) can not be repaired and
neither it had to be since they come in very cheap cost in
comparison to the circuitry they contain. The Question arises in
front of us is that how to test an ic and when should we throw
or replace the IC.
There are four ways to Test an IC and if the IC is ne and in
proper working condition then it has to pass all the four
conditions.
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Shorting Condition
The purpose of this method is to test if there is a short circuit
inside the IC
Set your multimeter to the continuity mode.
Connect all of the pins altogether from one of the side in IC
to the multimeter cable.
Take the terminal-cable from multimeter and connect it one
by one to each of the pins of another side separately.
If the beep sound occurs of there is a continuity in more than
50% of the combinations then there is a good chance of the
IC to be shorted from inside.
Leakage Condition
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26/01/2021 IC TESTING - DCAClab Blog
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In this Method you have to test an IC that weather the package
is damaged or is blown. Take the observation of the IC from
each of the sides possible, if you see even a little crack, burned
mark or its broken from either side then the IC is surely to be
Damaged or Leaked.
Heating Condition
In the method we test if an IC is getting overheated
unnecessarily.
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26/01/2021 IC TESTING - DCAClab Blog
Give the voltage supply to the IC as per its operating
condition or if its on board then turn its supply on.
Touch the IC with your nger just by starting the voltage
supply to it.
Notice if the IC is getting heat up as it naturally gets or if you
0 are not able to touch it after few 10-12 seconds.
Shares If the ic is getting heat up extremely faster then the IC is
2 surely to be damaged.
Input and Output Supply Condition
In this we have to test an IC if the output voltage from signal
pins of the IC are as per de ned voltage or they di er from the
speci cations. Just an example of IC 74VHC112 which has
Dual JK Flip Flop with Preset and Clear mode. The supply
voltage to the ic that is Vcc could be 0.5 V to 7V and the output
from the Signal/Data pins could be either +0.5V or – 0.5V.
Connect the Vcc to input Voltage and Ground to the Ground of
negative of the supply.
Try the di erent inputs to the ip op so that you can get logic
“1” at-least once on each of the output pins.
Measure the voltage of the pin when you’re getting “1” as a logic
output.
If the voltage is very much di erent from 0.5V then the IC is not
functioning as its best.
If You found any of the above four conditions while testing an ic
then there are very much chances that your IC is not
functioning as it should be and you may need to replace your IC
Farhan Sheikh is an Electrical and Electronics Engineer
passionate about making circuits and digital electronics. He
Runs a blog EEE Projects which provides General information
about Electrical – Electronics Topics and Projects.
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Thomas
March 1, 2018
My atmel microcontroller ic got exploded, damn its a
huge crack in the middle
Reply
Dave
August 11, 2018
I recalled my engineering days when I used to test the
integrated chips the same way described in the article.
The method to check the IC mentioned here is totally
correct.
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