47 µF at 20 V — bulk decoupling for 12 V and 5 V rails
The TPSE476K020R0150: That voltage margin covers 12 V rails with derating and handles 5 V rails comfortably — the 20 V rating gives headroom for transients on a 12 V bus without needing a higher-voltage part. The 150 mOhm ESR is the spec that governs ripple current handling and transient response. For a 12 V-to-1.8 V buck converter, this cap on the output absorbs the inductor ripple without excessive self-heating; the low ESR also improves load-step recovery compared to a standard tantalum with 500 mOhm or higher. This package is widely used for bulk capacitance on power inputs and point-of-load stages, and the size code E ensures mechanical interchangeability with other manufacturers' 2917 tantalum parts.
Temperature range and deployment context
In a telecom base station power supply that sees 85°C ambient, this cap operates well within its rated envelope; the ESR will increase with temperature, but the 150 mOhm baseline at 25°C leaves margin before the ripple current derating curve becomes a constraint. For high-reliability designs, the TPS series is a general-purpose line; if AEC-Q200 qualification is required, check the specific automotive-grade variants from the same family.
If a second-source is needed, a parametric search for 47 µF, 20 V, 150 mOhm in a 2917 case will yield alternatives from other tantalum manufacturers — but the KYOCERA AVX part is the active baseline.