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TVS Selection Guide

1) To determine the maximum DC or continuous working voltage in the protected circuit, the rated standard voltage and "high end" tolerance of the circuit;
2) The rated transient power of TVS is greater than the maximum transient surge power that can occur in the circuit;
3) The cut-off voltage of TVS should be greater than the maximum operating voltage of the circuit being protected;
4) The maximum clamping voltage of TVs is less than the damaged voltage in the protected circuit of the later stage;
5) After the TVS maximum clamping voltage is determined, the peak pulse current is greater than the transient surge current;
6) For the circuit protection of data interface, it is also necessary to select TVS with appropriate capacitance. For example: when the signal frequency or transmission rate is higher, TVS with low junction capacitance series should be selected;

TVS selection Matters

1) The specification manual only gives the peak absorption power under a specific pulse width, while the pulse width in the actual circuit is variable.
2) For the protection of small current load circuit, the current limiting resistance should be increased consciously.
3) Pay attention to that the steady-state average power of TVS is within the safe range.
4) Consider temperature changes. Under normal conditions, TVS operates between - 55 ° C and 150 ° C. If the temperature in the circuit is high, it should be reduced.
5) The lead length of TVs shall be opposite to the protected line.
6) For protection in data interface or communication line, TVS with relatively small capacitance value should be selected as far as possible.
7) Uni-directional TVS is applied for DC protection circuit, bidirectional TVS is applied  for AC protection circuit, TVS array device is applied for multi-path protection circuit, and special protection module is applied for high-power protection circuit.
8) In using TVS, minimize the number of strings/unions, given the discretization of TVS.

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