1500 µF bulk cap with 18 mOhm ESR — why the low resistance matters
The TPME158K002R0018 is a molded tantalum capacitor from KYOCERA AVX's TPM series, delivering 1500 µF at 2.5 V with an ESR of just 18 mOhm. That ESR figure is the key selection lever: in a switching-regulator output filter, the ripple voltage is the product of the ripple current and the ESR, so a 18 mOhm part keeps the AC ripple a fraction of what a typical 100 mOhm tantalum would produce — without needing extra ceramic bypass caps.
Full -55 to 125 °C range — where it fits on the board
That means it can live on an avionics power bus, a downhole instrument module that sees 125 °C ambient, or a satellite EPS rail where the thermal swing is wide.
Listed as Active on the manufacturer's status. That means no last-time-buy countdown for new designs or ongoing production runs.