WEET CF Carbon Film Resistor Structure Application and Introduction

Carbon film resistor is a type of film resistor. It is formed by using high-temperature vacuum coating technology to tightly attach carbon to the surface of the ceramic rod to form a carbon film,
 then adding appropriate joints for cutting, and coating the surface with epoxy resin for sealing and protection. Its surface is often coated with green protective paint.

The thickness of the carbon film determines the magnitude of the resistance, and resistors are usually controlled by controlling the thickness of the film and etching.
 Carbon film resistance, also known as thermal decomposition carbon film resistance. A thin film resistor in which carbon from the high-temperature decomposition of hydrocarbons in vacuum is deposited on a substrate. Low price, stable performance, wide range of resistance and power.

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Carbon film resistors are made by using organic adhesives to mix carbon ink, graphite, and fillers into a suspension and coating it on an insulating substrate, which is then heated and polymerized. Gaseous hydrocarbons decompose in high temperature and vacuum, and carbon deposits on ceramic rods or tubes, forming a layer of crystalline carbon film.

By changing the thickness of the carbon film and changing the length of the carbon film using grooving methods, different resistance values can be obtained. Carbon film resistors have lower costs, poor electrical performance and stability, and are generally not suitable for use as general-purpose resistors. But because it is easy to make high resistance films, it is mainly used as a high resistance high-voltage resistor. Its purpose is the same as high-voltage resistors.

The lead connection methods of carbon film resistors include axial lead, tie lead, and no lead connection.

The resistance range of carbon film resistors is 1 Ω to 10 M Ω. The rated power includes 0.125W, 0.25W, 0.5W, 1W, 2W, 5W, 10W, etc.

The main function is to hinder the flow of current, which is applied in current limiting, shunt, voltage reduction, load and capacitor matching, filter and resistance matching, etc.

Carbon film resistor structure

Carbon film resistor is a specialized device used to decompose gaseous hydrocarbons in high temperature and vacuum, and the decomposed carbon is uniformly deposited on the circumferential surface of a ceramic cylinder or ceramic tube to form a layer of crystalline carbon film. According to the required resistance value, the thickness of the carbon film is changed and the spiral groove pitch is selected,

To determine the appropriate cross-sectional area and length of the carbon film, then pinch the copper end cap, solder out the lead wire, and spray paint the surface for packaging

Application of Carbon Film Resistors

Carbon film resistors were once the most widely used resistors in electronics, electrical appliances, and information products, with the cheapest price and high quality stability and reliability. Due to its lead type resistor, it is convenient for manual installation and maintenance, and it is also the cheapest among lead resistors,

Nowadays, it is mostly used in low-end products such as power supplies, adapters, or early designed products with low value.