US 11,694,825 B2
Radial-leaded over-current protection device
Feng Ji Li, Taoyuan (TW); Yi-Hsuan Lee, Taichung (TW); and Yung Hsien Chang, Douliu (TW)
Assigned to POLYTRONICS TECHNOLOGY CORP., Hsinchu (TW)
Filed by Polytronics Technology Corp., Hsinchu (TW)
Filed on Sep. 10, 2021, as Appl. No. 17/471,890.
Claims priority of application No. 110121151 (TW), filed on Jun. 10, 2021.
Prior Publication US 2022/0399142 A1, Dec. 15, 2022
Int. Cl. H01C 7/02 (2006.01); H02H 9/02 (2006.01); H01C 1/14 (2006.01)
CPC H01C 7/021 (2013.01) [H01C 1/1406 (2013.01); H01C 7/028 (2013.01); H02H 9/026 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A radial-leaded over-current protection device, comprising:
a PTC element comprising comprises a first conductive layer, a second conductive layer and a PTC material layer laminated therebetween;
a first electrode lead having an end connecting to the first conductive layer;
a second electrode lead having an end connecting to the second conductive layer; and an electrically insulating encapsulation layer, wherein the electrically insulating encapsulation layer comprises a fluorine-containing polymer, and wraps around an entire outer surface of the PTC element and the ends of the first and second electrodes connecting to the PTC element;
wherein the electrically insulating encapsulation layer has a thickness of 102˜105 nm;
wherein the radial-leaded over-current protection device has an initial resistance Rbf of 0.0017˜0.0027Ω; and
wherein after being put in a high temperature and high humidity environment for 336 hours, the radial-leaded over-current protection device has a resistance recovery R % of 1.07-1.21, and an endurable current per unit area of the device of 0.85-1.10 A/mm2.