Environmental testing of elastomeric connectors

The electrical performance of metal-in-elastometer connectors is evaluated for chip-on-board applications. Flowing mixed gas (FMG) class-II corrosion and dust tests are performed in accelerated conditions to simulate the long-term operating life of connectors in office-type environments. To explore the functional limits, the connectors are also tested in FMG class-III conditions, which simulate industrial environments. The parameters, low-level contact resistance (LLCR) and surface insulation resistance (SIR) leakage current, are monitored throughout the test to assess electrical stability. Special requirements for the printed circuit boards used in applications with metal-in-elastometer connectors are identified by metallurgical analysis after the corrosion tests. The test results show that the elastometer connectors are viable interconnect media in corrosion and dust environments. Good electrical performance (long-term stability) is attributed to the gasket-like sealing properties of the high density separable connectors.<>