47 µF at 20 V — bulk decoupling and hold-up in a D-case footprint
The TPSD476M020R0100: The 100 mOhm ESR directly governs ripple current handling and self-heating — at this ESR, the capacitor can sustain roughly 1.4 A ripple at 100 kHz before the internal temperature rise reaches the derating limit. For a 20 V rail, a 50% voltage derating (10 V working) is standard practice with tantalum MnO₂ dielectrics to avoid field-failure from surge current.
Active lifecycle — no obsolescence pressure on the BOM line
The TPS series is a mature, high-volume product family with broad distribution coverage.
The molded construction provides mechanical robustness against vibration and thermal shock compared to conformal-coated chips.