Defence Chip Resistors and Networks from State of the Art

MIL-PRF-55342 includes precision and semi-precision part numbers that use thick film and thin film materials and processes to provide the complete range of part numbers.

Precision thin film chip resistors have resistance tolerances of ±0.1, ±0.25, and ±0.5% and/or temperature coefficient of resistance of ±25 and ±50 ppm/°C. Thin film materials are sputter deposited and patterned using photolithography. These thin film resistor materials exhibit low current noise and lower drift than semi-precision thick film resistors.

Semi-precision thick film devices have resistance tolerances of ±1, ±2, ±5, and ±10% and/or temperature coefficient of resistance of ±100, ±200, and ±300 ppm/°C. Thick film pastes are screen printed onto alumina substrates and fired at 850°C. These thick film resistors have higher current capacity than precision thin film resistors.

MIL-PRF-55342

MIL-PRF-32159

MIL-PRF-914

MIL-PRF-914 surface mount resistor networks are available in three sizes and with three schematics each.

MIL-PRF-914 provides product level M, which is maintained at an established reliability rating of 1%/1000 hours. Group A includes 100% thermal shock, 100% power conditioning, and 100% DC resistance performed on a production lot basis. Visual inspection and solderability are performed on an inspection lot basis. Group B and Group C are performed on an inspection lot basis. The inclusion of 100% power conditioning in MIL-PRF-914’s Group A inspection mimics the space-level infant mortality screening found in MIL-PRF-55342.

Nominal measurements are in inches. *There are three different electrical schematics for each package listed.