Abstract: The present invention is an electrostatic discharge protection device having a low trigger voltage. The device can utilize a process of manufacturing a PCB to minimize costs and manufacturing time. The device comprises: a discharge area, which is essentially a space within the device and can be filled by a material having a desired breakdown voltage, and at least two electrode areas, wherein the two electrode areas are substantially electrically isolated from each other and simultaneously adjacent to or within the discharge area. When an electric potential difference between the electrode areas exceeds a predetermined value, a conductive path between the electrode areas will be created by discharging through the discharge area. The device is characterized in that each of the two electrodes is a part of a conductive plate, and the two conductive plates become a part of the device by pressing or adhering so that a gap for electric isolation exists between the two electrode areas.

Abstract: A method of manufacturing an electronic protection device comprises: providing a substrate mother board with a top surface and a bottom surface; forming a first conductive layer and a second conductive layer on the top surface and the bottom surface, respectively; cutting the substrate mother board into a plurality of strip-shaped substrates; and forming insulating layers on surfaces of each of the strip-shaped substrates that are not covered by the first conductive layer and the second conductive layer.

Abstract: The present invention relates to an end electrode structure of a surface-mounted resettable over-current protection device. A polymer-based sheet is punched with a mold for manufacturing a plurality of H-shaped through-holes separated at an equal interval, such that several strip-shaped sheets are formed. Then, a first pair of electrodes and a second pair of electrodes are manufactured on each of the strip-shaped sheets through an ordinary through-hole manufacturing process of a printed circuit board. Then, the sheet is divided into several strip-shaped devices, thereby forming several over-current protection devices with five-sided electrodes. Thereby, with the five-sided electrode, the device may be more easily adhered to a circuit board.

Abstract: An input protection circuit is provided for protecting internal circuitry of a handheld electric device. The internal circuitry has a positive input node and a ground node. The input protection circuit includes a power socket having a positive input node and a ground node, a bipolar junction transistor (BJT), a metal-oxide semiconductor (MOS) transistor for controlling the on and off states of the BJT, and an overvoltage protective circuit. An emitter of the BJT is electrically connected to the positive input node of the power socket, and a collector is electrically connected to the positive input node of the internal circuitry. When a reverse DC voltage or a DC voltage exceeding a threshold inputs from the power socket, the overvoltage protective circuit will turn off the MOS transistor, thereby turning off the BJT to prevent damages of the internal circuitry.

Abstract: An input protection circuit is provided for protecting internal circuitry of a handheld electric device. The internal circuitry has a positive input node and a ground node. The input protection circuit includes a power socket having a positive input node and a ground node, a bipolar junction transistor (BJT), a metal-oxide semiconductor (MOS) transistor for controlling the on and off states of the BJT, and an overvoltage protective circuit. An emitter of the BJT is electrically connected to the positive input node of the power socket, and a collector is electrically connected to the positive input node of the internal circuitry.