The invention relates to an electro-static
discharge (ESD) protective circuit. The ESD protective circuit is in a
diode series structure which is capable of restraining a Darlington effect. According to the ESD protective circuit, two ends of a P substrate are respectively provided with two N traps, wherein the bottoms of each two traps are connected into a whole. A P base region is arranged between each two N traps. Each N trap of four N traps is provided with an N+
diffusion active region. Each P base region is provided with a P+
diffusion active region and an N+
diffusion active region. Four of N+ diffusion active regions are connected through wires, and then are connected with power source potential
voltage drain drain (VDD). A first P+ diffusion active region is connected with an
electricity positive
electrode. A fifth N+ diffusion active region is connected with a second P+ diffusion active region through wires. A sixth N+ diffusion active region is connected with an
electricity negative
electrode. The ESD protective circuit has the advantages of greatly reducing currents flowing to the P substrate, and being capable of effectively restraining the Darlington effect, good in clamping capacity, small in leakage current, good in ESD resistant capacity of unit area, and capable of effectively restraining occurrence of a latch-up effect.