Definition of Bulk Metal® Foil Resistor technology
Unlike thin film or wirewound resistors, Bulk Metal® Foil resistors owe their superior precision to the use of a special alloy foil, with a thickness of several microns, as the resistive element. Use of this metal foil as the resistance element provides superior performance not found in any other resistor technology. In particular the temperature coefficient of resistance (TCR) has been reduced to an unprecedented, extremely low level of 0.14 ppm/°C thanks to strict quality control of the alloy composition and a newly developed foil stabilization treatment technology.
Manufacturing Process, Adjustment of Resistance Value Construction, and Temperature Characteristics of Resistance
Key Characteristics of Bulk Metal® Foil Resistors
Temperature Characteristics of Resistance:
0.14 ppm/°C (typical)
Resistance Tolerance:
±0.005%
Long Term Stability:
5 ppm/year, 10 ppm/3 years (hermetically-sealed)
Load Life Stability:
0.005%/2000 hours
Thermal EMF:
0.1 μV/°C (between leads)
Noise:
-42 dB
Voltage Coefficient:
0.1 ppm/V
Frequency Characteristics:
Inductance: 0.08 μH/capacitance: 0.5 picofarad
NASA (Goddard Space Flight Center) Evaluation Report
"Evaluation Report for Fixed, Precision, Metal Foil Resistors Similar to MIL-R-122/1, Parts Technology Report 61132 & 80819A"
Based on a NASA (U.S. National Aeronautics and Space Administration) evaluation report, Alpha Electronics` Bulk Metal® Foil Resistor has been approved for NASA space flight applications. Our Bulk Metal® Foil Resistors are currently used in the GOES weather satellites program, the MTSAT program, and the Cassini Saturn program.