Metal Oxide Film Resistor

- the metal oxide film resistor was the first major alternative to the carbon composition used up until the early 1960s.

Metal-oxide film resistors were widely used as the first real alternative to carbon composition resistors that were traditionally used.

The metal oxide film resistor provided a significant improvement in performance over the carbon resistors with higher degrees of stability, accuracy, and much lower levels of noise for which the carbon resistors were renowned.

Metal oxide film resistors

Metal oxide film resistors are manufactured as fixed leaded resistors.

They are use a ceramic rod as the base for the resistor. This is coated with a thin film of a conductive metal oxide - one popular material is tin oxide.

Comparison of metal oxide film resistors with metal film

The metal oxide film resistor is widely used and is often has similar properties to the metal film resistor. To gain an appreciation of when the metal oxide film resistor should be used a comparison chart is included below.


Comparison of Metal Oxide Film Resistor
Parameter Metal Oxide Film Metal Film
Maximum operating temperature 450°C 250 - 300°C
Temperature coefficient Poor ~300ppm/°C Better
Low resistance values Poor properties, including tolerance Better performance
Noise properties Similar to carbon film Better than Metal oxide film

By Ian Poole


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