Patent ID: 7920045
Filing Date: 2011-04-05
Classification: H01C,H05K

Abstract:
1. A surface mount circuit protection device comprising: (a) a laminar PTC resistive element having first and second major surfaces and a thickness therebetween, said resistive element comprising a conductive polymer composition; (b) a first electrode layer formed at the first major surface and being substantially coextensive therewith, and comprising a first metal material of a type adapted to be soldered to a printed circuit substrate for effecting surface mounting of the device; (c) a second electrode layer formed at the second major surface and being substantially coextensive therewith; (d) weld plate means of metal material formed separately of and extending from the second electrode layer and having a thermal mass capable of withstanding resistance micro spot welding of a strap interconnect means without significant resultant damage to the device, said weld plate means including a raised central mesa region; and (e) an insulative box surrounding outer edges of the device and defining an opening exposing the central mesa region.