Chip Resistor Back Electrode Insulating Resin Layer

The back electrode is divided into two distinct layers: a lower layer made of sintered silver and an upper layer made of electrically conductive resin. This segmentation allows each layer to perform its specific function - the sintered silver provides thermal stress relaxation and outgas resistance, while the conductive resin provides electrical conductivity and solder wettability. The layered structure resolves the contradiction by separating the conflicting material requirements into different spatial zones.

The back electrode uses a composite structure combining sintered silver and electrically conductive resin in a laminated configuration. This composite material approach leverages the complementary properties of both materials - the metallic sintered silver for mechanical stability and outgas resistance, and the resin-based conductive material for electrical performance and solder bonding. The composite structure enables simultaneous achievement of thermal stress relaxation and outgas prevention.

The electrode structure is segmented into functional layers where the sintered silver layer provides the necessary step height and outgas resistance, while the conductive resin layer provides electrical conductivity without limiting the overall step height. This segmentation allows the sintered silver layer to be formed with sufficient thickness for mechanical support and stress relaxation, while the resin layer adds electrical functionality without constraining the dimensional requirements.

The invention changes the material parameter of the upper electrode layer from sintered silver to electrically conductive resin. This parameter change allows for greater flexibility in achieving required step heights, as the resin layer can be formed with controlled thickness independent of the sintering process constraints. The resin material can be deposited to achieve the necessary dimensional parameters without the limitations of sintered silver formation processes.

The back electrode is segmented into a lower sintered silver layer for strong adhesion to the ceramic substrate and an upper conductive resin layer for stress distribution. This segmentation allows the sintered silver to maintain excellent bond strength with the substrate while the resin layer acts as a stress-absorbing intermediate that prevents crack propagation along the substrate interface.

The conductive resin layer serves as a pre-positioned cushioning layer between the rigid sintered silver electrode and the ceramic substrate. This resin layer absorbs and distributes thermal stresses before they can concentrate at the substrate-electrode boundary, preventing crack formation in advance. The softer resin material accommodates thermal expansion differences, cushioning the interface against stress-induced damage.