What parameters should be paid attention to in the selection of TVS electrostatic protection diode?

What parameters should be paid attention to in the selection of TVS electrostatic protection diode?

On the premise of selecting ESD protection diode, we must first understand its function and parameters. It is very important where it is suitable for use and what kind of protection it plays.

Overview of ESD electrostatic protection diode

ESD protection devices are used to prevent sensitive circuits in electronic equipment from being affected by ESD (electrostatic discharge). ESD electrostatic protection diode is an overvoltage and antistatic protection element, and ESD electrostatic protection is a common electronic electrostatic protection element in daily life. ESD diode is an over-voltage and anti-static protection device, which is designed for I/O port protection in high-speed data transmission applications. ESD protection diode is used to prevent sensitive circuits in electronic equipment from being affected by ESD (electrostatic discharge).

Characteristics of ESD electrostatic protection diode

Low capacitance, the lowest can reach a few tenths of a picofarad;

● Fast response time: usually less than 1.0PS；;

● Small size, miniaturized devices, saving PCB space;

● The working voltage can be designed according to the working voltage of IC, such as 2.8V, 3.3V, 5V, 7V, 15V, etc.

Guide for selection of ESD electrostatic protection diodes

1) The cut-off voltage of 1)ESD diode is greater than the highest working voltage in the circuit;

2) The choice of pulse peak current IPP and maximum clamping voltage VC should be based on the maximum surge current that may occur on the line. It should be noted that VC at this time should be less than the maximum peak voltage that the protected wafer can tolerate;

3) When used for signal transmission circuit protection, be sure to pay attention to the frequency or transmission rate of the transmitted signal. When the signal frequency or transmission rate is high, ESD diodes with low capacitance series should be selected;

4) Select the appropriate package according to the circuit design layout and the number of protected lines. The size of ESD package can reflect the protection level of the device to a certain extent. Generally, the larger the package, the larger the ESD chip area and the higher the protection level, and vice versa.