Electrostatic grow results from natively attrition, the working nature of large wiring cannot avoid to chafe. Want wiring to avoid the harm that receives electrostatic discharge, the circuit that has design of FAE electron engineer with respect to consequent need is electrostatic defend the ESD protector form a complete set with plan and right choice defends the type selecting of the electrostatic protection element of plan. A variety of ESD had existed to protect parts of an apparatus on market at present, but the most commonly used can divide 3 kinds big: Polymeric, pressure quick resistor / restrain implement with diode. A character that basically analyses diode of discharge of ESD of electrostatic protection parts of an apparatus for everybody:

 

ESD discharge diode is one kind is pressed too, antistatic protect component, it is the parts of an apparatus that the I/O port protection that transmits application for high speed data designs. ESD protection parts of an apparatus is to use the sensitive circuit in preventing electronic facility to get ESD(is electrostatic discharge) influence. Can provide low-down electric capacity, have exceedingly good transmission line pulse (TLP) test, and IEC6100-4-2 tests ability, be as high as 1000 in much sampling number especially later, improve the protection of pair of sensitive electron component then.

 

Any protective element must serve as tall impedance circuit to appear in the input that gets protection to carry during regular job. The capacitance that it brings to bear on is laden must as far as possible small, the input signal that makes be opposite normal does not have an influence almost. However, in the instant that presses too, same parts of an apparatus must become the main thoroughfare of energy, energy from be carried to be transferred by the input of protective parts of an apparatus. In addition, the safe voltage that protects parts of an apparatus must the tension of the biggest signal that prep above gets protection to carry place to allow. Same, its Qian voltage must low the parts of an apparatus that prevents a protection to enough suffers damage, because be during transient state happening,this is, the Qian that inputting the voltage on end will be protective parts of an apparatus voltage.

 

The character of ESD discharge diode:

1, response rate is rapid (be less than 1ns)

2, capacitance cost is low (apply to transmission line of high frequency high speed)

3, volume is minor, enclose diversification, saved occupy board space (contented and can different product applies)

4, leakage current is small, prolonged battery life (be less than 1uA)

5, voltage cost is low (lowest can accomplish 2.5V) conduce to the electronic circuit with sensitive protection sufferring electrostatic discharge (ESD) the destruction of incident

 

The product type selecting of ESD discharge diode still wants finally to choose the ESD model that fit according to the specific requirement of each clients. In mix for client type selecting when offerring product program, must be sure to keep in mind, want basis application port, defend grade chooses to stick piece pressure quick resistor or diode, choose capacitance to be worth according to transmitting frequency, frequency is taller, the look value of parts of an apparatus is about to jump over low, look value is too great cause signal easily to lose a bag, accordingly, must choose the ESD that suits most according to oneself demand.