240 ohm 1/4W 240R Metal Film Resistor 50 Pieces

As the name of this resistor type specify, the resistive element is a thin film of metal, encased in a ceramic body. They are axial resistors of various resistances.

Specifications

• Brand Name:DSSRQI
• Type:Fixed Resistor
• Condition:Brand New Resistor
• Technology:Metal Film
• Model Number:240ohm 1/4w
• Package Type:Throught Hole
• Resistance:240ohm
• Resistance Tolerance:1%
• Rated Power:1/4w
• Temperature Coefficient:±100PPM/°C
• Operating Temperature:-55°C~155°C

NGN 450.00

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Metal film resistors have a thin metal layer as resistive component on a non-leading body. They are among the most widely recognized sorts of axial resistors. Other film sort resistors are carbon film and thick and thin film resistors. In most writing referrals to metal film, for the most part it is a barrel shaped axial resistor. Be that as it may, thin film chip resistors utilize a similar assembling guideline for the metal layer. The shape of metal film resistors is like carbon film resistors, yet their properties for steadiness, precision and unwavering quality are impressively better.

How they are built 

The resistive component is a thin metal layer that is typically sputtered (vacuum deposition) on a round and hollow ceramic core. Here and there different strategies than sputtering are utilized. The stored metal is falsely matured by keeping it for a long stretch at a low temperature. This brings about a superior precision of the resistor. The resistance material is frequently nickel chromium (NiCr), however for unique applications likewise different amalgams are utilized, for example, tin and antimony, gold with platinum and tantalum nitride. The steadiness and resistance are firmly reliant on the thickness of the metal film (50-250 nm). A bigger thickness of the layer brings about a superior stable and a lower resistance rating.

On the two ends a metal cover is squeezed with the terminal leads. After this, the reqired resistance is accomplished by cutting a winding formed space in the thin metal layer. This is normally done by lasers, while in the past sandblasting and crushing strategies were utilized. Carbon film resistors utilize a similar strategy to trim the resistance. The resistor is secured with a few covering layers that are heated independently. The covering ensures against dampness and mechanical burdens and ideally has a high dielectric quality. The resistor rating is identified by color code groups or with content. Their tolerance range is in 0.1, 0.25, 0.5, 1 and 2% range. The Temperature Coefficient of Resistance is generally around 50 and 100 ppm/K.

Uses of Metal Film Resistors 

Metal film resistors have great attributes for tolerance, steadiness and TCR. Moreover, the resistors are of low noise properties and a high linearity on account of a low voltage coefficient. Subsequently, in circuits where tight tolerance, low temperature coefficient and low noise properties are essential, regularly metal film resistors are utilized. They are typically used in bridge circuits and filters.

Unwavering quality of metal film resistors 

For metal film resistors to perform optimally, they are used around 20 and 80 percent of their predetermined power rating. Unwavering quality is for the most part increased by derating half of the rating power. Notwithstanding, in certain circumstances, at lower than 20% i.e. using about 80% of the power rating in a moist environment their reliability declines. Contrasted with wirewound or carbon piece resistors, these resistors are easily damaged by voltage surges and power over-loads.