33 µF, 25 V, 200 mOhm — bulk decoupling with controlled ESR
The TPSD336M025R0200: The 200 mOhm ESR is the key parameter for a power-supply designer: it sets the capacitor's ripple current capability and self-heating under AC load. A lower ESR means less internal temperature rise for the same ripple, which directly impacts reliability in a 125°C ambient. The ±20% tolerance is standard for tantalum electrolytics. Derating is recommended — for a 25 V rated part, a common guideline is to apply no more than 50-60% of rated voltage (12.5-15 V) to avoid surge-related failures, especially in low-impedance circuits.
Molded construction and TPS series reliability
The molded type uses a solid tantalum anode with a manganese dioxide cathode, encapsulated in an epoxy case. This construction gives the TPS series a proven track record for stable capacitance over temperature and frequency, with no wear-out mechanism under normal operating conditions. The -55°C to 125°C operating range covers both industrial and automotive underhood environments. At 125°C, the voltage derating should be more aggressive — typically 2/3 of rated voltage or less — to maintain long-term reliability. The D-case (2917) footprint is a common size for tantalum chip capacitors, compatible with standard pick-and-place equipment.