254JG1K

Series:	--
Packaging:	Bulk
Part Status:	Active
Resistance in Ohms @ 25°C:	250k
Resistance Tolerance:	±10%
B Value Tolerance:	--
B0/50:	3892K
B25/50:	--
B25/75:	--
B25/85:	--
B25/100:	--
Operating Temperature:	300°C
Length - Lead Wire:	1.00" (25.40mm)
Mounting Type:	Through Hole
Package / Case:	DO-204AH, DO-35, Axial

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Temperature Sensors - NTC Thermistors

NTC thermistors are highly sensitive, temperature- dependent resistors, typically made from semiconductor materials such as semiconducting oxides. Their resistance decreases sharply as temperatures drop, and they\'re used widely for a variety of applications, including temperature measurement and temperature control. A specific type of NTC thermistor - 254JG1K - is designed primarily for temperature sensing and control applications in industrial, laboratory, and OEM markets. 254JG1K thermistors have a wide operating temperature range (from -55°C to +125°C) and possess excellent characteristics in terms of accuracy, stability, and repeatability.

254JG1K Application Fields

254JG1K thermistors are used in a broad range of fields including, but not limited to:

• Automotive and Industrial Equipment: temperature measurement, temperature control and thermal management
• Medical Equipment: temperature and pressure sensing
• Appliances: temperature and humidity control
• Communication and Electronics Devices: temperature measurement
• Heating and Cooling Applications: over-temperature protection

Working Principle

The 254JG1K thermistor is a “Negative Temperature Coefficient” or “NTC” thermistor device. The basic premise behind this type of thermistor is that their resistance changes in a predictable manner in response to changing temperatures. As the temperature increases, the device’s resistance decreases and as the temperature decreases, the resistance increases. More specifically, the resistance of an NTC thermistor is inversely proportional to the temperature. This means that as the temperature increases, the resistance of the device decreases in a predictable manner. This relationship is described by the following equation:

R = R0 x exp(-βT)

Where:

• R is the resistance at temperature T
• R0 is the resistance at 0°C
• β is the “beta” or “magnification factor”, and is specific to the particular thermistor device.
• T is the temperature in °C

The 254JG1K thermistor has a β = 4300K and can be used over a temperature range of -55°C to +125°C.

Temperature Measurement and Control with the 254JG1K

The 254JG1K thermistor can be used in a variety of temperature measurement and control systems. The device can be connected in a voltage-divider circuit, allowing the device to be read using an analog-to-digital converter (ADC) connected to a microcontroller (such as an Arduino). According to the equation above, the voltage produced by the device can be mathematically converted to a temperature reading (in °C). Alternatively, the device can be used in a conventional Wheatstone bridge circuit, where the device’s resistance is balanced by the output from an instrumentation amplifier. The amplifier’s output signal is then read using an ADC connected to the microcontroller.

254JG1K in Practice

The 254JG1K has proven itself useful in a number of temperature sensing and control applications. For example, the device has been used in automotive engines to detect precise temperatures for control of fuel injection. It has also been used in industrial equipment, such as machining and production equipment, to sense temperatures in order to protect sensitive components from overheating or excessive cooling. The device has also been used in medical equipment, such as MRI machines, to sense and control temperatures during operation. Additionally, 254JG1K thermistors have been used in domestic appliances (e.g. air conditioners, washing machines) to help control temperature and humidity. Finally, 254JG1K thermistors have been used in communication and electronics devices for temperature measurement and control.

Conclusion

The 254JG1K thermistor is an excellent temperature-sensing device, with a wide operating temperature range and excellent repeatability. It is suitable for a wide range of applications, ranging from automotive and industrial equipment to consumer electronics. The device is easy to operate and can be connected in simple voltage-divider or Wheatstone bridge circuits for measurement and control. These features make the 254JG1K an ideal solution for temperature measurement and control in a variety of industries and applications.

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