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We are using CD4098 & CD4528(CD14538) in our very old products for minimum 20 years. There are thousands of product that are installed on customer's site and till now we have not faced any major issue in this IC.
There are two meanings I can think of for "lifespan"
One is what Dylan provided above -- the MTBF or Mean Time Between Failures, which is an industry standard term for the statistical rate of failure for a device.
The other definition would be for how long TI plans to continue to produce the device and sell it.
The MTBF tells you that a group of devices is expected to 'survive' for 3.71E8 seconds, or about 12 years, without a failure.
The time TI plans to continue to produce the device is part of our discontinuance policy.
TI’s Product withdrawal/discontinuance process complies with J-STD-048, latest issue. TI makes an effort to not obsolete products out of convenience. Convenience means: low running device, poor yields, limited customer adoption or similar items. TI’s obsolescence withdrawal schedule provides a longer lead time than the industry standard. TI allows 12 months for the last order and an additional 6 months to take final delivery of obsolete items. In rare circumstances, an accelerated withdrawal schedule may be necessary. In such cases, TI will communicate the last buy and final delivery dates in the EOL notice, along with an explanation of the circumstances necessitating the early withdrawal.
To boil that down to plain English, it means that we will continue to produce a device as long as we have a customer buying it, and no other factors stop us from continuing to make it.
