173-303LAG-301

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NTC thermistors are temperature sensors with a non-linear resistance-temperature characteristic that is a result of a physical phenomenon called the temperature coefficient of electrical resistance. The 173-303LAG-301 is an NTC thermistor manufactured by Murata Electronics North America and is a component of their NTC Thermistors for Automotive Electronics series. In this article, we will discuss the application fields and working principle of this specific NTC thermistor.

Application Fields of 173-303LAG-301 NTC Thermistor

The 173-303LAG-301 is a small size NTC thermistor (with a resistance of 30K ohm at room temperature) designed for use in high-speed automotive circuits. It can directly detect the temperature of liquid cooling systems and oil tanks mounted in the engine, and is primarily used for automotive engines, navigation systems, braking systems, and air conditioners. Additionally, the small size allows the thermistor to be easily integrated and installed in slim places.Its long-term stability is also very reliable.

Working Principle of 173-303LAG-301 NTC Thermistor

The fundamental nature of an NTC thermistor is that it has a negative temperature coefficient of resistance, meaning that its resistance decreases as the temperature increases. This result is produced by specific cutting wires that are used in thermistor manufacturing process. The exact temperature coefficient of a particular thermistor, and thereby the exact temperature response, depends on how these wires are cut. In addition to its variable resistance, NTC thermistors also have an almost linear current-voltage relationship.

When voltage or current is applied to the NTC thermistor, a small portion of the current passes through the thermistor and causes heating due to the resistor. The temperature of the thermistor increases, and so does the resistance. This increase in resistance further increases the current running through the thermistor, thus creating a feedback loop. Eventually, the temperature will reach equilibrium, and the current passing through the thermistor will also reach equilibrium.

The thermistor\'s resistance in this equilibrium state will depend on the ambient temperature in which it is operating. The main advantages of NTC thermistors are their robustness, high sensitivity, wide temperature range, fast response time, long-term stability, and low cost.

Conclusion

The 173-303LAG-301 NTC thermistor has many advantages for specific temperature sensing applications, such as automotive engines, navigation systems, braking systems, and air conditioners. Its small size, robustness, and long-term stability make it suitable for use in high-speed automotive circuits. The working principle behind NTC thermistors relies on the negative temperature coefficient of resistance, the current-voltage relationship, and a feedback loop to reach equilibrium in the resistance. All of these features together make the 173-303LAG-301 an ideal choice for the listed applications.

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