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Alpha's surface mount precision resistor EQ21K50, from Trendsetter Electronics, has an impedance of 21.5Kohm, a power rating of 0.125W, a tc of 5ppm, and a tolerance of 0.05%. A metal foil precision resistor, unlike a precision-class metal film resistor or wire-wounded resistor, is an ultra-precision resistor in which the primary resistant element is a special alloy foil several µm thick. Use of this metal foil as the resistance element gives superior performance not found in other resistors, satisfying military specification MIL-PRF-55182/9. In particular, the temperature coefficient of resistance has been reduced to an unprecedented, extremely low value by strict quality control of alloy composition and newly developed foil stabilization treatment technology. In addition, from the point of view of long-term stability, which is an important property of a resistor since the foil has a thickness of several µm instead of the extremely thin film of a metal film resistor, the natural stability of metal is preserved, resulting in very little resistance change over several years. Precise amplifier circuitry and referential power supply in items such as sophisticated electronic equipment, instrumentation and medical electronic apparatus are excellent places to use this technology.

• EQ Series Datasheet (PDF)