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Reliability of an NTC Thermistor
2018/03/27 09:03:18

The reliability of a thermistor can be a major factor to consider when a warranty is going to be used for the product that the thermistor is in.


For example suppose that a thermistor is used in a motor drive that will go through on-off cycling 15 times per shift @ 3 shifts per day and has a warranty for 10 years. Then to find the product life that your supplier uses: (15times/shift)*(3shifts/day)*(365days/yr)*10yrs = 164,250 cycles needed


To insure that the thermistor can last that long some supplier uses a calculation called the Mean Time Before Failure (MTBF), which is calculated as follow:


MTBF = m = Ta /r

Where Ta = ∑ Ti + (n-r)td

Where: Ti = cycles to failure or time to failure prior to completion of the test
r = # of failures
n = total # of samples tested
td = duration of test

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