A nitrogen-fireable base metal thick-film resistor system compatible with copper conductors has been developed. A lanthanum hexaboride conductive phase is used to make resistor compositions in the range 10-10K OMEGA /2b and, doped tin oxide is used as the conductive in the 10K-1M- OMEGA /2b resistance range. The environmental stability of 44 lots made in pilot, prototype, and manufacturing scale runs have been evaluated and confirm lot-to-lot reproducibility. Lanthanum boride members show good environmental stability under all conditions. Doped tin oxide members are humidity-sensitive and require encapsulation. When encapsulated with an organic material, all grades show maximum changes of less than 1% after 1000 hours of exposure to 85 degree C/85% RH.
|Number of pages||9|
|Journal||Proceedings - Electronic Components and Technology Conference|
|State||Published - 1 Jan 1987|