Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1995-04-21
1997-02-25
Regan, Maura K.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324718, 324719, 324696, 422 8203, 437 8, H01C 1300
Patent
active
056062648
ABSTRACT:
Seepage of water and other impurities into hermetically sealed on plastic encapsulated modules leads to eventual device failure, as conductor material corrodes and opens, or electromigrates to establish conductive trails across a substrate, shorting the conductors. To forewarn of such failure, a sensing device defined as a separate chip is packaged in the same module with the circuit to be checked, with pinouts that can be tested with a circuit that is usually external. The sensor makes use of the moisture-induced migratory behavior that causes the problem, using a highly migratory metal or alloy to define paired electrodes spaced as closely as 2 micrometers apart. The metal of the electrodes undergoes rapid ionization and migration in the presence of trace amounts of moisture, dissolved ionic contaminants, and a small potential difference across the electrodes. Two volts applied to the sensor conductors by the sensor circuit will output a voltage if even a minute current is flowing between the electrodes permitting "go
o-go" decisions to be made regarding use of the module. The moisture which actuates the sensor, triggers the circuit long before the level of seepage and electromigratic represents present danger of circuit failure, and long before other types of sensors would indicate the existence of a problem.
REFERENCES:
patent: 3943557 (1976-03-01), Frazee
patent: 4080564 (1978-03-01), Nitta
patent: 4224565 (1980-09-01), Sosniak
patent: 4272986 (1981-06-01), Lowry
patent: 4775831 (1988-10-01), Annamalai
Licari James J.
Tanielian Aram
Logan II Charles C.
Regan Maura K.
Solis Jose M.
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