What the 6.8 µF / 35 V / 400 mOhm stack means for a BOM line
The TPSD685M035R0400: This is a standard MnO2 tantalum capacitor from the TPS series — molded case, D-size (2917 / 7343 Metric), 6.8 µF at 35 V with a 400 mOhm ESR and ±20% tolerance. The 400 mOhm ESR is the middle of the road for this case size — it handles ripple current without excessive self-heating but is not a low-ESR grade for high-frequency decoupling. The -55 to 125 °C operating range matches the full military/industrial temperature envelope.
Active lifecycle — no last-time-buy clock
marks the product status as Active. That means no last-time-buy pressure and no forced respin for an existing design.