Polarity components require special attention throughout the PCBA process, as errors in directional components can lead to batch accidents and failure of the entire PCBA board, so it is extremely important that engineering and production staff understand SMT polarity components. l Polarity definition Polarity means that the positive and negative poles or the first pin of the component are in the same direction with the positive and negative poles or the first pin on the PCB(printed circuit board). If the direction of the component does not match with that on the PCB, it is called reverse defect. l polarity identification method 1. Resistor without polarity 2. Capacitor 2.1 Ceramic capacitors without polarity 2.2 Tantalum capacitors have polarity PCB board and components positive marking: 1) colour band marking; 2) "+" sign marking; 3) angled marking. 2.3 Aluminium electrolytic capacitors have polarity Part marking: colour band for negative; PCB board marking:
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