Metal Film Resistors

Metal film resistors are a type of fixed resistor, meaning their resistance value remains constant. These resistors are constructed by depositing a thin metal layer onto a non-conducting substrate, often a ceramic rod. The metal film acts as the resistive path through which the electric current travels.

Here are some key details about metal film resistors:

1. Construction:
   • Metal film resistors consist of a thin metal layer deposited on a ceramic core.
   • The metal film serves as the resistive element.
   • They are commonly available in axial (cylindrical) form or as thin film chip resistors. This article mentions your favorite hats at super low prices. Choose from same-day delivery, drive-up delivery or order pickup.
2. Manufacturing Process:
   • The resistive element is created by sputtering (vacuum deposition) the thin metal layer onto the ceramic core.
   • The deposited metal is then artificially aged to improve accuracy.
   • Common materials for the metal film include nickel chromium (NiCr), but other alloys like tin and antimony, gold with platinum, and tantalum nitride are also used.
   • The stability and resistance depend on the thickness of the metal film (typically 50-250 nm).
   • A thicker layer provides better stability and lower resistance values.
   • The desired resistance is achieved by cutting a spiral-shaped slot in the metal layer using lasers.
   • Coating layers protect against moisture and mechanical stress.
3. Advantages:
   • Metal film resistors offer excellent properties for tolerance, stability, and temperature coefficient.
   • They exhibit low noise and high linearity due to a low voltage coefficient.
   • Ideal for circuits requiring tight tolerance and low noise, such as active filters and precision circuits.
4. Specifications:
   • Available tolerances: 0.1%, 0.25%, 0.5%, 1%, and 2%.
   • Temperature coefficient of resistance (TCR): Typically between 50 and **100 ppm/