FAQ Issue 1 | MELF resistors have two operating modes. Do you know the difference between them?

Latest update time：2021-06-03

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What is it? Why? What should I do? When selecting and applying resistors, inductors and other components, are your brains always filled with these questions? Don't worry, the powerful "problem crusher" is here!

Ask anytime, experts answer! In the newly launched Vishay WeChat FAQ column, we will share some common technical problems in the selection and application of resistors and inductors, and ask Vishay experts to give detailed and authoritative answers.

In the first issue, we will discuss the working mode of MELF resistors .

Introduction

MELF (Metal Cylindrical Leadless) Resistors are high-reliability thin-film resistors introduced by Vishay DBR Division. This product uses advanced vacuum sputtering technology and excellent laser cutting technology to ensure its long-term working stability. At the same time, the cylindrical structure further improves its pulse resistance and effectively reduces noise.

But did you know that MELF resistors have two working modes in applications? Reasonable selection can make their application more flexible. Today we asked Vishay experts to talk about the difference between them.

ask

I noticed that the MELF has two operating modes: Standard Mode and Power Mode. What is the difference between the two and how do I order the right part?

Vishay's MELF resistors are high-reliability thin-film resistors manufactured using advanced vacuum sputtering technology and have long-term working stability. In applications, MELF resistors have two working modes:

1. Standard working mode

This refers to normal operating conditions in a typical circuit environment, that is, not exceeding the appropriate maximum electrical load, and the maximum film temperature of the thin film chip resistor does not exceed 125°C. In this operating mode, the resistor will exhibit the following drift performance:

Thin Film SMD Resistors • Standard Operation:

It is clear that a chip resistor operated under these conditions can last for more than 20 years without failing due to excessive changes in its value.

2. Power working mode

It is important to note that not all chip resistor applications require a life expectancy of more than 20 years. Typically, a 10-year lifespan is sufficient. This allows for a higher resistance drift, which in turn allows for a higher film temperature, such as 155°C.

Thin Film SMD Resistors • Standard Operation:

From the above comparison, it can be seen that by selecting the operating mode and the allowable power dissipation, the same MELF resistor product can be suitable for two different types of applications.

For a comparison of the parameters of specific products, please see the table below, which you can refer to when selecting products.

(Click to view larger image)

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