What is ESD clamp?
clamps are known as static ESD clamps. Transient clamps take advantage of. the rapid changes in voltage and/or current that accompanies an ESD event. During this transient, an element is turned on very quickly and slowly turns. off.
What is an ESD diode?
A TVS diode (ESD protection diode) is a kind of Zener diode. It is a diode that is mainly used for static electricity (ESD) countermeasures. It protects integrated circuits and others from high-voltage ESD entering from a USB line etc.
How to find the clamping voltage of an ESD?
This blue waveform shows the resulting clamped waveform. The best way to find the clamping voltage of an ESD diode is to look for the transmission line pulse plot, or TLP plot. The TLP provides the current voltage relationship of the diode, and the clamping voltage can be extrapolated for a given input current.
What kind of voltage do you need for ESD diode?
You need to meet IEC 61000-4-2 level 4 compliance, so the ESD diode must be rated for at least 8kV contact discharge and 15kV air-gap discharge. The clamping voltage of the ESD diode at a 16A TLP must be less than 19V, since the system will fail at 19V.
How are stack diodes used in voltage clamps?
Diode Stacks. In applications where the input voltage is allowed to exceed the power supply voltage or ground, a stack of diodes may be used to protect the input from ESD events. Figure 4 shows an amplifier that implements a stacked diode protection scheme. In this configuration, the diode string is used to protect from negative transients.
What should the clamping voltage be at a 16A TLP?
The clamping voltage of the ESD diode at a 16A TLP must be less than 19V, since the system will fail at 19V. The TPD1E04U04 is a good solution because it meets all of these requirements: It’s a unidirectional ESD diode that has a VRWM of 0 to 3.6V. It has a low capacitance of 0.5pF.