Define the maximum steady-state voltage, transients, ambient temperature and expected ripple current before selecting a part. Record the circuit role and any regulator stability requirements.
Then compare capacitance, tolerance, ESR under specified measurement conditions, leakage, physical dimensions and mounting constraints. Apply the manufacturer’s series-specific voltage and temperature guidance. There is no universal derating percentage that fits every tantalum technology.
Keep the complete ordering code on the approved BOM. Engineering approval and validation in the actual circuit remain necessary before production release.
Editorial procurement guidance. Component limits come from the cited manufacturer documents. Customer engineering remains responsible for application validation.