Circuit protection device and its manufacturing method

Abstract

The invention discloses a circuit protection device, which includes: a positive temperature coefficient heat-sensitive material layer, which consists of a first face and an opposite second face, as well as a first end face and an opposite second end face, with the first face comprising a first area adjacent to the first end face and a second area adjacent to the first area, and the second face comprising a third area adjacent to the second end face and a fourth area adjacent to the third area; a first electrode layer, which covers the first area; a second electrode layer, which covers the third area; a first terminal electrode, which is located on the first end face and is connected to the first electrode layer; a second terminal electrode, which is positioned on the second end face and is connected to the second electrode layer; a first insulation layer, which covers at least a part of the second area and at least a part of the first electrode layer so as to isolate the first electrode layer and the second terminal electrode; and a second insulation layer, which covers at least a part of the fourth area and at least a part of the second electrode layer so as to isolate the second electrode layer and the first terminal electrode.

Description

technical field [0001] The invention relates to the technical field of electronic devices, and more specifically, the invention relates to a circuit protection device and a manufacturing method thereof. Background technique [0002] A thermistor is a resistor whose resistance value changes with temperature. According to different temperature coefficients, thermistors are generally divided into positive temperature coefficient (Positive Temperature Coefficient, PTC) thermistors and negative temperature coefficient (Negative Temperature Coefficient, NTC) thermistors. PTC thermistors increase in resistance as the temperature increases, while NTC thermistors decrease in resistance as the temperature increases. [0003] This positive temperature coefficient characteristic of PTC thermistor can be used for circuit protection. Figure 1a and Figure 1b That is, a circuit protection device using a PTC thermistor is shown, wherein, Figure 1a is a schematic top view of the circuit ...

AI Technical Summary

Problems solved by technology

[0004] for Figure 1a and 1b As shown in the circuit protection device, its terminal electrodes 105a, 105b need to communicate with the regions located on both sides of the PTC thermosensitive material layer 101 through the via hole 106, and the via hole 106 will occupy the functional area (Active Area) of the PTC thermosensitive material layer 101. ), thus affecting the effective utilization area of ​​the device

In addition, in order to form the via hole 106, the metal plating layer 103 needs to be etched to form a via hole corresponding to the via hole 106. This drilling process limits the further reduction of the size of the circuit protection device.

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