Characteristics and Selection of ESD Electrostatic Protection Devices

Characteristics and Selection of ESD Electrostatic Protection Devices

ESD electrostatic protector is an overvoltage and anti-static protection component used to protect sensitive circuits in electronic devices from the influence of ESD (electrostatic discharge). Its function is to transfer ESD stress from sensitive components, allowing current to flow through the protective component rather than the sensitive component, while maintaining low voltage on the sensitive component; ESD electrostatic protectors should also have low leakage and low capacitance characteristics, without reducing circuit functionality; It will not cause damage to high-speed signals and the function of protective components will not decrease under multiple stresses.

ESD product features:

1. Fast response (action) speed (less than 1ns)

2. Low capacitance value (suitable for high-frequency and high-speed transmission lines)

3. Small size and diverse packaging (able to meet the application needs of various products)

4. Low leakage current (less than 1uA)

5. Ultra low limit voltage (clamp voltage)

6. Low voltage value (reverse cutoff voltage commonly known as maximum non operating voltage)

ESD product selection suggestions:

1. When using ESD electrostatic protectors, they are connected in parallel to the protected circuit and should not have any impact on the operation of the circuit under normal circumstances;

2. Selection of breakdown voltage Vp: The breakdown voltage of the ESD tube should be greater than the maximum working voltage Um of the line or the maximum voltage value of the signal level;

3. Selection of pulse peak current IPP and maximum clamping voltage VC: When using ESD tubes, the appropriate model of IPP should be selected based on the maximum surge current that may occur on the line. It should be noted that the maximum clamping voltage VC at this time should not be greater than the maximum peak voltage that the protected chip can withstand;

4. When used for signal transmission circuit protection, it is necessary to pay attention to the frequency or transmission rate of the transmitted signal. When the signal frequency or transmission rate is high, low capacitance series pipes should be selected.