A Comprehensive Thermistor Resistance Chart Guide

Thermistors are temperature-sensing devices that change resistance in response to temperature changes.

In a thermistor, the resistance decreases as the temperature increases, and this relationship can be described by the Steinhart-Hart equation.

Thermistors are available in various types, including negative temperature coefficient (NTC) and positive temperature coefficient (PTC) thermistors.

NTC thermistors have a lower resistance at higher temperatures, while PTC thermistors have a higher resistance at higher temperatures.

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Thermistor specifications vary depending on the type and model.

The standard sensor has an accuracy of ±0.2°C within the 0 to 70°C range.

High accuracy [XP] sensors offer improved performance with an accuracy of ±0.1°C within the same temperature range.

Sensor response times are also an important consideration. Bead thermistors in still air take around 5 seconds to respond, while those in stirred liquids respond in as little as 0.5 seconds.

Here are some key thermistor specifications at a glance:

The 10K-3 thermistor is a reliable choice for temperature measurement. It has a reference resistance of 10 KΩ at 25 °C.

This thermistor's operating range is quite impressive, spanning from -55 to 150 °C. That's a wide range of temperatures that it can accurately measure.

If you're looking for high accuracy, you're in luck - the 10K-3 is available as an [XP] high accuracy sensor. Just be aware that minimum quantities and long lead times may apply.

The 10K-3 thermistor has a power consumption of 2.7 mW/°C, which is relatively low. This makes it suitable for a variety of applications where power efficiency is important.

Here's a quick summary of the 10K-3 thermistor's specifications:

The 3.3K thermistor is a versatile option for temperature measurement. It has a reference resistance of 3.3 KΩ at 25 °C.

This thermistor type operates within a wide temperature range of -55 to 150 °C. I've found that this range is suitable for many industrial applications.

The 3.3K thermistor is available as a standard sensor, with no mention of any special requirements or lead times.

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At 20K, the resistance of a thermistor is significantly high, making it a good starting point for understanding its characteristics. This temperature is a key point in the resistance temperature characteristic curve.

The Steinhart and Hart equation is an empirical expression that accurately describes the resistance versus temperature characteristics of an NTC thermistor at this temperature. It's an important tool for thermistor designers and engineers.

To determine the constants for the Steinhart and Hart equation, you'll need to contact the applications engineering department of U.S. Sensor Corp., now acquired by Littelfuse in 2017. They have a BASIC program listing that can help you with the calculation.

The zero-power coefficient of resistance, or alpha T, is a critical parameter that describes the rate of change of zero-power resistance with temperature at 20K. This value is essential for understanding how a thermistor's resistance changes with temperature.

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The resistance ratio characteristic is a key factor to consider when working with thermistors, identifying the ratio of resistance measured at 25°C to that measured at 125°C.

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This characteristic is crucial for understanding how a thermistor will behave in different temperature conditions. The resistance temperature characteristic, on the other hand, is the relationship between a thermistor's zero-power resistance and its body temperature.

To accurately calculate the resistance temperature characteristic, you can use the Steinhart and Hart equation, but be aware that determining the constants for this equation can be quite lengthy. The calculation is so complex that you may need to contact the applications engineering department of U.S. Sensor Corp. for a copy of a BASIC program listing.

For power thermistors, it's essential to consider the resistance at maximum current, or RIMAX, which is the approximate resistance of the device under maximum steady-state current conditions.

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At 3.25k, we start to notice a significant shift in the data. This is a point of diminishing returns, where the benefits of additional data begin to outweigh the costs.

The average person can only process so much information before it becomes overwhelming. At 3.25k, we're already pushing the limits of human comprehension.

In fact, research suggests that the human brain can only hold about 7 chunks of information in short-term memory. This is known as Miller's Law.

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The resistance temperature characteristic is the relationship between a thermistor's zero-power resistance and its body temperature. This relationship is crucial for understanding how thermistors work.

The Steinhart and Hart equation is an empirical expression that best describes the resistance versus temperature characteristics of an NTC thermistor. It's a complex equation, and if you need to solve for the constants, you'll have to contact the applications engineering department of U.S. Sensor Corp., which was acquired by Littelfuse in 2017.

NTC thermistors have an inverse relationship between temperature and resistance. As temperature increases, resistance decreases, and as temperature decreases, resistance increases.

The resistance ratio characteristic identifies the ratio of a thermistor's zero-power resistance measured at 25°C to that measured at 125°C. This is an important characteristic for thermistors.

The zero-power temperature coefficient of resistance, or Alpha T, is the ratio of the rate of change of zero-power resistance with temperature to the zero-power resistance of the thermistor. This coefficient is a critical parameter for thermistors.

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PTC thermistors are a type of thermistor whose resistance value increases with temperature.

As temperature goes up, resistance goes up, and as temperature goes down, resistance goes down.

PTC thermistors have a direct relationship between temperature and resistance.

You can see this relationship in a chart of different types of PTC thermistors, where resistance increases as temperature increases.

At low temperatures, the resistance of PTC thermistors is low, and as temperature increases, resistance gradually increases as you move from left to right on the chart.

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Maximum Current is the highest amount of current a device can handle without sustaining damage. This is often referred to as the device's maximum capacity.

For power thermistors, the approximate resistance of the device under maximum steady state current conditions is known as Resistance At Maximum Current (RIMAX). The RIMAX value is a critical factor in determining the device's overall performance and lifespan.

Maximum Current is a crucial consideration when selecting a device for a particular application. It helps ensure the device can handle the expected load without overheating or failing.

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