
92 • Warranty Claims Reduction
FAILURES IN TIME
e failures in time (FIT) of a device is the number of failures that can be
expected in a specied number of device- hours of operation. is term is
used particularly by the semiconductor industry. Device- hours is the prod-
uct of the number of devices that operated in accordance with the specica-
tion multiplied by the specied number of hours. Instead of time, you can
use number of operations. en it is reported as failures in operation (FIO).
e average time between one failure and the next, either on a single
sample or on a group of samples, or between dierent failures on the same
product, i ...