Tantalum Capacitors

Tantalum capacitors are where you go when you need high capacitance in a small footprint and ceramic simply will not behave. They come in three main flavors: solid manganese dioxide (MnO2), conductive polymer, and wet tantalum for high-voltage or military work. Most buyers browsing this category are looking for surface-mount chips in case sizes from 0402 up to EIA 7343, though through-hole and axial wet tantalums still move steadily for legacy aerospace and defense programs. You will find them in power supplies, medical implants, telecom infrastructure, and anywhere that needs stable capacitance across temperature without the piezoelectric singing you get from Class II ceramics. The trade-off is cost. Tantalum runs significantly higher than MLCC, and the raw material supply chain is concentrated enough that allocation events happen every few years. Buyers here typically check surge current rating, ESR, and derating guidelines before they look at price. A 20 percent derating rule is common for MnO2 types, but polymer tantalums can often run closer to rated voltage if the application is well-behaved. Counterfeit risk is real in this category, especially for military-grade CWR09 and CWR19 series or obsolete Kemet T491 parts that command premium pricing. We see buyers getting burned by refurbished or reeled parts that look right but fail surge testing. Packaging preference matters too. Many engineers still want tape and reel with intact factory labels rather than cut tape, even if it means buying a full reel of 500 or 2,000 pieces. If you are cross-referencing a Vishay 293D or AVX TAJ series, check the ESR and height profile carefully. A part that fits the pad layout might still be too tall for your enclosure. Stock and lead time vary wildly by case size and voltage, so verify current availability at icxing.com before you finalize your BOM.