Patent ID: 8976001
Filing Date: 2015-03-10
Classification: H01H

Abstract:
1. A protective device, comprising: a substrate having a top surface and a bottom surface opposite to the top surface; two first electrodes respectively arranged at two opposite sides of the substrate; a low-melting point metal layer arranged over the two first electrodes and having a first surface facing the top surface of the substrate and a second surface opposite to the first surface; an assisting layer formed on the second surface of the low-melting point metal layer, and a bridging structure directly contacting with the assisting layer on the second surface of the low-melting point metal layer, wherein a first liquidus temperature of the assisting layer is below a second liquidus temperature of the low-melting point metal layer, and the first liquidus temperature of the assisting layer is not below a predetermined temperature, the predetermined temperature is below a maximum temperature of reflow soldering process by 25 degrees Celsius.