6.8 µF at 50 V — the derating margin in a D case
The TAJD685K050RNJ: This is a molded tantalum capacitor from the TAJ series, rated 6.8 µF at 50 V with ±10% tolerance. The 50 V rating in a 2917 (7343 Metric) D case gives a 1.43× derating factor on a 35 V rail — the standard practice for tantalum is to stay below 2/3 of rated voltage to avoid field-failure risk from surge current.
1 Ohm ESR and the ripple current ceiling
ESR is 1 Ohm — this sets the self-heating under AC ripple. Above that, the internal temperature accelerates the capacitor's aging rate.
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