For tantalum capacitors, which circuit should use standard series, which should use polymer series?

How is the derating rules of them?

What we should pay attention when using?

Pls see our below chart for your better understanding.

How to choose standard tantalum and polymer tantalum
Photo	Which circuit is applicable?	Which circuit is not applicable?	Voltage Derating	Remark
CA45 Standard	1) Energy storage 2) Low-power filtering 3) Consumer electronics 4) Leakage protectors 5) General audio 6) Bluetooth wireless devices	1) High-power filtering (high-power supplies, communications); 2) High-frequency filtering with low circuit impedance	1) Derating to 30% for filtering circuits; 2) Derating to 50% for energy storage circuits	1) do not reverse the polarity; 2) avoid using a multi-meter to test the capacitor; 3) pay attention to the peak temperature and duration of reflow soldering (within -5℃ range of the peak temperature)
CA45L Low ESR	1) Industrial control instruments 2) Medical 3) Household appliances 4) Automobiles 5) High-end audio 6) Bluetooth wireless devices	High-power filtering (high-power supplies, communications)	1) Derating to 50% for filtering circuits; 2) Derating to 70% for energy storage circuits	1) do not reverse the polarity; 2) avoid using a multi-meter to test the capacitor; 3) pay attention to the peak temperature and duration of reflow soldering (within -5℃ range of the peak temperature)
CA55 Polymer	1) Industrial control instruments (non-wireless Bluetooth) 2) Medical (non-wireless Bluetooth) 3) Home appliances (non-wireless Bluetooth) 4) Automobiles (program control systems) 5) Audio (fever-level) 6) Communications (high-frequency) 7) Solid-state drives (power failure protection) 8) Laptops (chip filtering)	1) Meters: gas meter, energy meter,water meter, 2) Bluetooth wireless devices Other circuits requires low leakage	1) Derating to 80% for filtering circuits; 2) Derating to 50% for high-power pulse charging and discharging circuits	1) do not reverse the polarity; 2) pay attention to the peak temperature and duration of reflow soldering; 3) pay attention to moisture storage before reflow soldering to prevent cracking and increased leakage current after reflow soldering