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For 1.5uF ceramic capacitors, a three-wire code is used, where the first and second wires represent the value and the third wire represents the tolerance. Due to the special color coding of 1.5uF, some standards use three yellow lines, where the first two yellow lines represent the numerical value and the third yellow line represents the tolerance (usually ±20%). The purpose of this is to make the color coding of the capacitors consistent from different manufacturers. However, there are also some manufacturers may use other color lines, so when buying capacitors, you also need to check their specifications.
The three yellow lines of the 1.5uF capacitor usually represent that the capacitor's rated voltage is 400V or above, and the color code of the three yellow lines indicates that the tolerance value of the capacitor is ±20% in the international standard color code. Therefore, these capacitors are often used in circuits or industrial equipment that require high voltage stability.