How to Buy a Thermistor: A Comprehensive Guide

Your Guide to buying the best Thermistors

Overview

A thermistor is a type of temperature sensing device commonly used in electronics applications. They are efficient, precise and reliable, and offer a wide range of temperature sensitivity. This guide will provide a comprehensive overview of thermistors, including what they are, how they work, their advantages and disadvantages, and the different types of thermistors available. Additionally, it will provide guidance on how to choose the best thermistor for your specific application. Whether you need a thermistor for a simple temperature sensing project or a complex temperature control system, this guide will provide the information you need to make the right choice.

Key features

  1. Type - Thermistors come in two main types: PTC (Positive Temperature Coefficient) and NTC (Negative Temperature Coefficient). PTC thermistors will have a positive resistance change with increases in temperature, while NTC thermistors will have a negative resistance change with increases in temperature.
  2. Temperature Range - Different thermistors have different temperature ranges in which they are effective. Make sure you find a thermistor that is within the temperature range you need.
  3. Voltage Rating - Different thermistors have different voltage ratings, which is the maximum amount of voltage they can safely handle. Make sure you purchase a thermistor that is rated for the voltage you need.
  4. Response Time & Sensitivity - Depending on the application, you may need a thermistor that is either fast or slow to respond to changes in temperature, as well as one that is more or less sensitive to temperature changes. Make sure you find a thermistor that meets your requirements.
  5. Size & Shape - Thermistors come in various sizes and shapes, and some may be better suited for your specific application than others. Make sure you find a thermistor that fits into the space you have available.
  6. Price - Thermistors come in a variety of prices, ranging from a few cents to hundreds of dollars. Make sure you find a thermistor that fits into your budget.

See the most popular Thermistors on Amazon

Important considerations

Pros

  • Accurate Temperature Measurement - Thermistors are highly accurate temperature measurement devices, providing an accurate reading that can be used to determine the effectiveness of various systems.
  • Wide Range of Temperature Measurement - Thermistors are capable of detecting temperatures between -200 and 600 degrees Celsius.
  • Highly Sensitive - Thermistors are extremely sensitive and able to detect small temperature changes quickly.
  • Low Cost - Compared to other temperature measuring devices, thermistors are comparatively inexpensive.
  • Durability - Thermistors are generally very durable and can withstand a wide range of temperatures and conditions.

Cons

  • Limited Temperature Range - Thermistors generally have a limited temperature range and can only operate within a certain temperature range, typically between -50°C and 150°C.
  • High Sensitivity - Thermistors are very sensitive to temperature changes and thus require careful consideration when dealing with small or rapid temperature changes.
  • Non-linear Outputs - Thermistors have non-linear outputs and thus require more complex circuitry to accurately measure the temperature.
  • High Cost - Thermistors are more expensive than other temperature sensors, such as thermocouples, and thus require a higher initial investment.
  • Failure Modes - Thermistors can fail in a number of ways, such as open circuits due to high temperatures, short circuits due to low temperatures, and mechanical failure due to shock or vibration.

Best alternatives

  1. Resistors - Passive electrical components that reduce or limit the flow of current
  2. Capacitors - Electrical components that store and release energy in an electric field when charged and discharged
  3. Inductors - Electrical components that store energy in a magnetic field when an electric current flows through them
  4. Varistors - Electrical components that are voltage dependent resistors and used to regulate voltage
  5. RTDs - Electrical components that measure temperature by measuring the resistance of a metal wire
  6. Thermocouples - Electrical components that measure temperature by measuring the voltage difference between two dissimilar metals in an electric circuit

Related tools, supplies, and accessories

  • Resistors: Resistors are electrical components that regulate the current in a circuit. They can be used with Thermistors to increase or reduce the resistance.
  • Capacitors: Capacitors are electrical components that are used to store energy in a circuit. They can be used in combination with a thermistor to help regulate electrical current.
  • Heat Sinks: Heat sinks are used to dissipate heat from thermistors. By providing a large surface area, the heat is dissipated more quickly and the device is kept cool.
  • Thermocouples: Thermocouples are devices that measure temperature using two different metals. They can be used with thermistors to measure temperature accurately.
  • Thermistor Controllers: Thermistor controllers are devices that are used to control the temperature of a thermistor. They are typically used in applications where the temperature needs to be maintained within a certain range.

Common questions

  1. What is a Thermistor?
    A thermistor is a type of resistor with a resistance that changes when the device's temperature changes. Thermistors are typically made from semiconductor materials such as ceramic or metal oxides.
  2. What is the Difference Between Thermistors and Thermocouples?
    The main difference between thermistors and thermocouples is the way in which they measure temperature. Thermistors measure temperature changes by measuring changes in electrical resistance, while thermocouples measure temperature differences by measuring potential differences between two different metals.
  3. What Are the Different Types of Thermistors?
    There are three main types of thermistors: Negative Temperature Coefficient (NTC) thermistors, Positive Temperature Coefficient (PTC) thermistors, and Temperature-Dependent Resistors (TDRs). NTC thermistors have a decrease in resistance as temperature increases, while PTC thermistors have an increase in resistance as temperature increases. TDRs have a more complicated resistance-temperature relationship.
  4. What are the Benefits of Using Thermistors?
    Thermistors offer several benefits, including high accuracy, fast response time, and high stability. They can also be used in a wide range of temperatures, up to several hundred degrees Celsius. Additionally, thermistors are small and relatively inexpensive, making them ideal for many applications.
  5. What Are the Disadvantages of Thermistors?
    The main disadvantage of using thermistors is that they can be sensitive to noise and vibration, which can affect their accuracy and response time. Additionally, thermistors can be affected by changes in humidity, and their accuracy can drift over time.
  6. What Are Some Applications of Thermistors?
    Thermistors are used in a wide range of applications, such as temperature measurement, over-temperature protection, temperature control, and surge protection. They are also commonly used in medical, automotive, and industrial applications.
  7. What Should I Consider When Buying a Thermistor?

Trivia

Many people may not know it, but thermistors are actually used in some of the world's most popular game consoles. In fact, they are used in the Playstation 5 and the Xbox Series X to control the temperature inside the consoles and prevent them from overheating while playing games. This is an important function that ensures users can enjoy their gaming experience without concern for their consoles. As a fun fact, it turns out thermistors are a real lifesaver for gamers. Source: https://www.febatech.com/blog/thermistors-in-game-consoles/

Disclaimer: This buying guide was not created by humans, and it is possible that some of it's content is inaccurate or incomplete. We do not guarantee or take any liability for the accuracy of this buying guide. Additionally, the images on this page were generated by AI and may not accurately represent the product that is being discussed. We have tried to convey useful information, but it is our subjective opinion and should not be taken as complete or factual.