Our TS20L series is LOW ESR Chip Tantalum Capacitor. This type of capacitor is with 6 different sizes ( S case, A case, B Case, C case, D case, E Case ).
Above features make it is good for SMT electric board used for telecommunication computer camcorder and mobile phone set and so on.
For details ESR of each item, you can find in our table in Spec http://www.capacitors.hk/Tantalum-Capacitors/TS20L.pdf.