How to select TVS diodes (ESD protection diodes)
The following describes how to select TVS diodes for typical interfaces.
Follow these steps to set up a parametric search to find TVS diodes.
Click the following link to view a list of TVS diodes for automotive
applications.
List of TVS diodes for automotive applications
 


Selection procedure

Voltage of signal Line
What is the maximum voltage of the signal or power line to be protected?　
Select a TVS diode with a VRWM higher than this voltage.
Signal polarity
Is the signal line to be protected a single-polarity (either positive or
negative) line?　Or, is it a dual-polarity line?
Use a bidirectional TVS diode for a dual-polarity line. For a single-polarity 
line, either a unidirectional or bidirectional TVS diode can be used. However,
some unidirectional TVS diodes provide better ESD protection for 
negative-polarity signals. If an IC is destroyed even in the presence of a TVS
diode, consider replacing it with a unidirectional TVS diode.
Signal speed
What is the maximum frequency of the signal line to be protected?　
A TVS diode with high total capacitance CT could degrade signal integrity.
Select a TVS diode with adequate capacitance according to the signal frequency.
Use the following figure as a guide to select a TVS diode with adequate 
capacitance.
Clamp voltage
To obtain good ESD protection performance, select a TVS diode with the clamp 
voltage higher than the line voltage.
IEC 61000-4-2
Select a TVS diode with a guaranteed ESD tolerance level higher than the system’s
ESD immunity requirement. Note, however, that ESD tolerance of the TVS diode is
generally proportional to its total capacitance CT.

	Use the following figure as a guide when selecting TVS diodes.
	 



Product List

General-purpose power supply for audio lines
Interface
USB 1.1 / SIM cards
USB 2.0 / High-speed memory
USB3.0 / HDMI ® / RF ANT / Wi-Fi
Thunderbolt / USB3.1 / HDMI ® 2.1

	Follow the above steps to set up a parametric search.
	
	 
 TVS Diodes (ESD Protection Diodes)