Electrostatic protection structure for low trigger voltage thyristor
A low trigger voltage, electrostatic protection technology, applied in circuits, electrical components, electrical solid devices, etc., can solve the problem of high reverse breakdown voltage, achieve the effect of large current gain, convenient design, and improve electrostatic discharge capacity
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[0020] Such as Figure 5 As shown, due to the parasitic NPN transistor formed by N+ / PW / N+ and the NPN transistor formed by parasitic N+ / PW / NW have the same emitter and base, when the NPN transistor formed by N+ / PW / N+ When the tube is turned on, the NPN formed by the parasitic N+ / PW / NW is also turned on at the same time, thus triggering the SCR composed of the parasitic PNP tube formed by P+ / NW / PW and the NPN tube formed by N+ / PW / NW structure. Figure 6 yes Figure 5 The equivalent circuit diagram.
[0021] As shown in the figure, the low trigger voltage thyristor electrostatic protection structure of the present invention includes:
[0022] An NMOS transistor is formed in the PW (P well); the parasitic NPN transistor formed by N+ / PW / N+ of the NMOS transistor has the same emitter and base as the NPN transistor formed by the parasitic N+ / PW / NW. The drain terminal of the NMOS transistor is electrically connected to the electrostatic terminal through the NW resistor Rnwl, and ...
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