Comparing Wirewound With Thick Film Power Resistor Technology

In the following paragraphs we Review two of the most common resistor types for ability resistor apps, Wirewound construction and thick movie technology.

Whatever the design The main style and design issues when building any electricity resistor are:

- The resistor value
- The required ability dealing with functionality
- Resistance stability over time
- Change in resistance benefit with temperature

In any higher electricity application temperature results plus the resistor ability handling ability are the key issues. The materials and strategies used to build the resistor features a direct impact on its long-term overall performance and security.

Resistor Construction

The resistor layout and development incorporates a immediate impact on its long-term steadiness and functionality. Overall resistance is set because of the resistivity of your resistor product, along with the resistor track duration, width and thickness. There are evident constraints with whatever resistor substance is selected. For thick movie resistors although it is feasible to increase track duration and width key boosts in thickness are impossible and also a restricted range of fabric resistivity are offered. For wirewound raising possibly the wire thickness or duration has An important influence on the size with the resistor.

The long term steadiness in the resistor substance and also the effect of temperature are vital concerns. Temperature results can degrade the resistor functionality or, in Severe cases, bring about resistor failure. From the thick movie resistors temperature effects might be minimized by picking out an proper thickness of an appropriate substrate product. For Wirewound resistors the construction, Main substance, the wire kind and diameter, the all demand very careful thing to consider.

Evaluating Resistor Systems

The true secret benefits of thick film electricity resistors in excess of Wirewound are smaller sized measurement, are available at noticeably lower Price (which include tooling Expense), have decreased inductance and enhanced thermal management. Thick film resistors are as a result smaller sized, Have a very speedier frequency reaction and so are resistors superior suited to heat sinking apps. Thick movie technological know-how also provides higher resistance values and higher voltage score than Wirewound resistors.

The major benefit of thick movie engineering in substantial electric power applications is the superior thermal conductivity in the ceramic (Alumina) substrate which makes it ideal for programs exactly where higher electricity dissipation is needed in a small place. The substrate materials indicates it is an excellent match Using the aluminium material in heat sinks and is particularly chemically inert and mechanically steady.


Even though Wirewound resistors do give bigger precision (enhanced tolerance), higher balance and lower values it is often with the expense of much bigger footprint and higher inductance than an equivalent thick film product. Any Wirewound resistor is fundamentally a coil of wire (an inductor) and Though decision of material can limit the effect from the substantial inductance it continues to be a major downside. The coil construction also tends to make warmth dissipation A significant situation.

Leave a Reply

Your email address will not be published. Required fields are marked *