What is the failure rate of opamps and comparators (FIT)?

The component failure rate (FIT) for Opamps and comparators depends on the type of opamp.

Reliability data originating in Siemens Norm SN 29500-2:

Important: The SN29500-2 FIT data depends on the degree of integration, therefore different parts list different values.

• BICMOS Op Amp, Comparators, Voltage Monitors: 8 FITs for a reference virtual $T_J$ of 45°C (source: OPA197-Q1 functional safety datasheet, also OPA388-Q1 functional safety datasheet and INA310-Q1 functional safety datasheet)
• CMOS, BICMOS Digital, analog / mixed: 20 FITs for a reference virtual $T_J$ of 55°C (source: OPA1679-Q1 functional safety datasheet - the “digital” part here is the class A/B control circuitry) but listed as 25 FITs for a $T_J$ of 55°C in the INA300-Q1 functional safety datasheet
• BiCMOS Comparators: 4 FITs for a reference virtual $T_J$ of 45°C (source: TLC393-Q1 functional safety datasheet)

For details on the methods you need to use to adjust them to your specific operating conditions, check out the TI whitepaper: Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500