Tantalum capacitors are polar. One end of the patch tantalum capacitor is marked with a horizontal line, which is the positive pole of the patch tantalum capacitor, and the other end is the negative pole.The longer leg of the lead tantalum capacitor is positive and negative at the other. Reverse connection will destroy the capacitor's voltage-withstanding characteristics, cause local breakdown of the capacitor, dramatically increase leakage current, and then increase heat, leading to the complete loss of capacitor function, or even fire and explosion. So the consequences of reversal are very serious.