Product Specifications
- Brand Name:DSSRQI
- Type:Fixed Resistance
- Condition:New
- Technology:Metal Film
- Package Type:Throught Hole
- Resistance:330ohm
- Resistance Tolerance:1%
- Rated Power:1/4w
- Temperature Coefficient:±100PPM/°C
- Operating Temperature:-55°C~155°C
- Color:Blue
| NGN 550.00 |
| Qty: Add to Cart |
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Included in the pack: 50 pieces of 330 ohm resistors, 1/4W power rating.
Metal film resistor definition
The resistor which utilizes metal film to constrain the movement of electric current to certain level is called metal film resistor.Metal film resistor development
The metal film resistor development is like the carbon film resistor with the exception that the material utilized for building the film is metal.In carbon film resistors, carbon is utilized to develop the film while in metal film resistors, tin and antimony or nickel chromium is utilized to build the film.
The metal film resistor is made by putting the metal film on a clay substrate. The metal film opposes the electric current moving through it. Subsequently, it acts as resistive component to the electric current.
The earthenware substrate does not permit heat through it. Thus, acting as insulating material to heat. The metal film resistors are more favored over their carbon counterpart resistors in light of the fact that the metal film resistors create less noise than the carbon type resistors. The metal film resistors have low tolerance value than the carbon type resistors. The difference between our required resistance value (300ω) and the genuine fabricated resistance value (302.4ω) is called tolerance.
In metal film resistor, the required resistance rating can be accomplished by either trimming the thickness of metal layer or by cutting the metal film in a helical way along its length. This is for the most part done by utilizing the lasers. Once the required resistance value is acquired, the cutting of metal is ceased.
Low Temperature Coefficient of Metal Film Resistors
The rate at which the resistance of the material changes with change in temperature is called temperature coefficient of resistance. Metal film resistors have low temperature coefficient of resistance. Thus, the resistance of the metal film resistors does not change effectively with change in temperature. Resistance of metal film resistor relies upon the thickness of metal film layer and width of helical metal film cut.Metal film layer
The resistance of the metal film resistor is conversely relative to the thickness of the metal film layer.Metal film layer with more thickness gives extensive space to the free electrons to move uninhibitedly starting with one place then onto the next place. Subsequently, the likelihood of free electrons crash with the particles is low. Along these lines, just few free electrons collide. The modest number of free electrons, which crashes into the molecules, loses their energy and the remaining number of free electrons moves uninhibitedly via conveying the electric current. Thus, the metal film resistors with thick film layer permits extensive measure of electric current.
Metal film layer with little thickness gives less space to the free electrons. Hence, the likelihood of free electrons collision is high. Hence, countless electrons slam into the iotas. The large number of free electrons, which crashes into the particles, loses their energy and the remaining modest number of free electrons moves uninhibitedly starting with one place then onto the next place via conveying the electric current. Along these lines, the metal film resistors with thin film layer permit just a little measure of electric current.
Width of helical metal film cut
The resistance of the metal film resistor is inversely corresponding to the width of helical metal film cut. The helical metal film cut with vast width give less imperviousness to the electric current on the grounds that the free electrons need to travel just a little separation through the resistive way. Thus, the likelihood of impact of free electrons with the iotas is less. In this manner, just few free electrons crash into the molecules and the staying substantial number of free electrons moves unreservedly starting with one place then onto the next place.The expansive number of free electrons that moves unreservedly starting with one place then onto the next place will convey the electric current. In this way, the metal film resistors with wide helical metal film cut permits extensive measure of electric current.
The helical metal film cut with less width give more opposition to the electric current in light of the fact that the free electrons need to travel a huge separation through the resistive way. Subsequently, the likelihood of free electrons impact with the iotas is high. Along these lines, an extensive number of free electrons slam into the molecules and the staying modest number of free electrons moves uninhibitedly.
The modest number of free electrons that moves openly starting with one place then onto the next place will convey the electric current. In this manner, the metal film resistors with limit helical metal film cut permits just a little measure of electric current.
The advantages of metal film resistors are:
- They are cheap
- The operate quietly, i.e. less noise than carbon arrangement resistor
- They can be used for different applications, covering more than carbon couterpart
- Their tolerance is low
- Low resistance
- Low temperature coefficient of resistance
- Small in size
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