Bidirectional transient voltage suppressor for triggering SCR by diode strings in an auxiliary way
A technology of transient voltage suppression and diode strings, which is applied in the direction of electric solid-state devices, circuits, transistors, etc., can solve problems such as low maintenance voltage and large latch-up risk, and achieve the effect of reducing trigger voltage and enhancing robustness
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[0027] Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:
[0028] The invention designs a bidirectional transient voltage suppressor that assists in triggering the SCR with the diode string by combining the features of low and controllable trigger voltage of the diode string and strong robustness of the overelectric stress of the SCR structure. The device of the invention can form a current discharge path with strong robustness and no hysteresis characteristics under the action of positive and reverse electrical stresses, and realize bidirectional ESD or transient surge protection.
[0029] A kind of bidirectional transient voltage suppressor proposed by the present invention, the device structure profile is as follows figure 1 As shown, it is characterized in that it mainly includes P substrate 101, deep N well 102, N well 103, P well 104, first P+ implantation region 105, first N+ implantation re...
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