[DigiKey TechForum] Key Voltage and Current Parameters to Check When Selecting a TVS
TECHWORLD ·
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When selecting a TVS diode, you should check the maximum reverse working voltage (V_RWM) and breakdown voltage (V_BR) as voltage-related items, and the maximum peak pulse current (I_PP) as a current-related item.
The maximum reverse working voltage (V_RWM) is the maximum reverse voltage that can be continuously applied to a TVS during normal operation, and it should be selected to exceed the circuit's maximum normal operating voltage.
The breakdown voltage (V_BR) is the threshold at which TVS current begins to flow when the reverse voltage reaches that value, and the maximum peak pulse current (I_PP) is the maximum pulse current a TVS can momentarily withstand.
When selecting a TVS (Transient Voltage Suppression) diode, you should first review the key electrical criteria by dividing them into voltage-related and current-related items. The voltage-related parameters to check are the maximum reverse working voltage (V_RWM) and breakdown voltage (V_BR), while the current-related parameter is the maximum peak pulse current (I_PP).
The maximum reverse working voltage (V_RWM) is the maximum reverse voltage that can be continuously applied to a TVS during normal operation. V_RWM should be selected to exceed the circuit's maximum normal operating voltage, with the goal of preventing unnecessary TVS operation during normal use.
The breakdown voltage (V_BR) is the threshold at which TVS current begins to flow when the reverse voltage reaches that value. Once V_BR is reached, further voltage rise is suppressed. Therefore, the upper and lower selection limits for V_BR should be set so that they exceed the maximum voltage during normal circuit operation while remaining below the withstand voltage of the protected component.
The maximum peak pulse current (I_PP) is the maximum pulse current a TVS can momentarily withstand. I_PP should be checked based on whether the surge current expected in the circuit is at or below this value.
When selecting a TVS, the maximum clamping voltage (V_C) should be checked first. The maximum clamping voltage (V_C) refers to the maximum voltage the TVS can limit when the maximum peak pulse current is applied, and this value must be lower than the maximum allowable voltage of the protected component.
Reverse leakage current (I_R) is another key item that should be checked as well. Reverse leakage current (I_R) refers to the leakage current flowing through the TVS at the maximum reverse working voltage, and it must remain within the allowable range. Excessive leakage current can affect normal circuit operation.
Junction capacitance (C_j) is a factor that affects the TVS response characteristics. Junction capacitance (C_j) also affects signal quality.
In particular, high-frequency signal circuits require a TVS with low junction capacitance. The purpose is to maintain signal quality.
Ultimately, the criteria for selecting a TVS lie in comprehensively reviewing voltage and current parameters. This should satisfy both uninterrupted normal circuit operation and the required protection performance.
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Source: TECHWORLD · Lee Gwang-jae
Original: https://www.epnc.co.kr/news/articleView.html?idxno=406155
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Source: TECHWORLD
View originalThis article was summarized and organized by BizCrush based on the original article from TECHWORLD. For exact quotations and full details, please refer to the original article.