The 20 V rating leaves headroom above the rail — a standard 80 % derating guideline puts the safe working voltage at 16 V, which comfortably covers a 12 V rail with margin for transients. The ±20 % tolerance is typical for tantalum capacitors and is acceptable for most decoupling and filtering roles where the exact capacitance is not critical.
500 mOhm ESR and the thermal budget
The 500 mOhm ESR sets the self-heating floor under ripple current. For a 68 µF cap on a 12 V rail switching at 500 kHz, the ripple current is typically a few hundred mA — the I²R loss stays under 50 mW, well within the part's thermal budget. If your application pushes ripple above 1 A RMS, the ESR will dominate the temperature rise, and you may need a lower-ESR polymer or ceramic alternative.
Molded case, size code C — footprint and layout
The molded case in size code C (2312 / 6032 Metric) measures 6.00 mm x 3.20 mm with a seated height of 2.80 mm max. No via-in-pad or thermal-pad considerations — just a standard two-pad land pattern.