100 µF, 20 V, 45 mOhm — bulk decoupling for tight rails
The TPME107K020R0045: This is a molded tantalum capacitor from the TPM series, rated 100 µF at 20 V with ±10% tolerance and a low 45 mOhm ESR at 100 kHz. The 45 mOhm ESR is the headline number here: it keeps ripple voltage under 45 mV per amp of ripple current, which matters when this cap is used as the output filter on a 12 V-to-3.3 V buck converter or as bulk decoupling on a 5 V rail feeding an FPGA bank. The 20 V rating gives a 33 % derating on a 12 V rail and a 4× margin on a 5 V rail, which is comfortable for tantalum — the industry rule of thumb is 50 % derating for worst-case surge.
Military temperature band — avionics and downhole fit
That means it holds its capacitance and ESR through the cold soak of a satellite eclipse and the 125°C ambient inside a downhole tool. The 2917 (7343 Metric) molded case handles the mechanical stress of thermal cycling without cracking the element — a known failure mode in uncoated tantalums.
No last-time-buy window to manage, no successor to qualify.