The higher the operating frequency of an ESD protector, the greater its impact on the signal. In fact, the impact of ESD protectors on signals depends on multiple factors, including their parasitic capacitance (Cj), operating voltage, breakdown voltage, clamp voltage, and peak pulse current

Firstly, parasitic capacitance (Cj) is one of the key factors affecting the signal impact of ESD protectors. The smaller the parasitic capacitance, the less impact it has on high-speed signals. Therefore, when selecting ESD protectors, it is advisable to choose devices with smaller parasitic capacitance to minimize the impact on the signal

Secondly, the operating frequency itself is not the only factor determining the magnitude of its impact on the signal. Even if the operating frequency of ESD protectors is high, if their design is reasonable, parasitic capacitance is small, and other performance parameters meet the requirements, their impact on signals can still be kept within a small range

In addition, it is necessary to consider the matching degree between the ESD protector and the protected circuit. If the performance parameters of the ESD protector do not match the requirements of the protected circuit, it may have a significant impact on the signal regardless of its operating frequency

Therefore, when selecting and using ESD protectors, multiple factors need to be considered comprehensively, including operating frequency, parasitic capacitance, operating voltage, breakdown voltage, clamp voltage, and peak pulse current. At the same time, it is necessary to select appropriate ESD protectors based on specific application scenarios and requirements to ensure minimal impact on signals and protect circuits from damage caused by electrostatic discharge

Overall, it cannot be simply assumed that the higher the operating frequency of ESD protectors, the greater their impact on signals. But it is necessary to select suitable devices based on specific application scenarios and requirements, and carry out reasonable circuit design and layout to ensure the stability and reliability of the circuit