How does the PN junction in a TVS diode work?
A TVS diode is formed by a specially designed P-N semiconductor junction for surge protection. The PN junction is usually coated to prevent premature voltage arcing during non conducting state. When there is a transient voltage event, the TVS diodes conducts to clamp the transient voltage using the Avalanche effect.
Which is TVS diode is used for ESD protection?
At this speed, the capacitance of the suppressor needs to be taken into account. The signal lines to be protected from ESD and lightning transients include Tx+/- and Rx+/-. As shown at the left, a low-capacitance TVS Diode Array (SP3002) is being used to provide up to 12kV ESD protection.
Where can I find surface mount diodes for TVS?
Typically found in medium-size packages (Axial, DO-214). Diode Arrays fall into the more broad category of Silicon Protection Arrays (SPA), which are targeted for ESD protection. Typically found in small surface-mount packages (SOIC-8, SOT-23, SC-70, etc …)
What are the voltages of Littelfuse TVS diodes?
Littelfuse supplies TVS Diodes with peak power ratings from 400W to 30kW, and reverse standoff voltages from 5V to 495V. Detailed information about most product series listed here can be found clicking on the series name in the far left column.
What is the reverse standoff voltage on a TVS diode?
Reverse Standoff Voltage (VR) In the case of a uni-directional TVS diode, this is the maximum peak voltage that may be applied in the ‘blocking direction’ with no significant current flow. In the case of a bi-directional transient, it applies in either direction.
How to choose the best TVS diode for your electronic application?
Lastly, you will need to choose the TVS component by establishing the maximum clamping voltage of the devices when subjected to high-voltage pulse impulse conditions. In normal circumstances, the most suitable clamping voltage should be about 35-30% higher than the maximum breakdown voltage or at least 60% higher than the rated standoff voltage.
How to use TVS diodes for transient voltage suppresison?
The primary way to protect a circuit from overvoltage is to place these TVS devices in parallel with the circuit. There are many types of TVS device that can be used for Transient Voltage Suppression namely Metal Oxide Varistor, TVS Diode, Zener Diode or a Bypass Capacitor.