An NTC thermistor (Negative Temperature Coefficient thermistor) is a type of temperature-sensitive resistor whose resistance decreases as its temperature increases. It is made from semiconductor materials, typically metal oxides like manganese, nickel, or cobalt, sintered into a ceramic form.
Key Characteristics of NTC Thermistors:
1. Negative Temperature Coefficient (NTC):
-Resistance drops as temperature rises (unlike PTC thermistors, which have a positive coefficient).
-Highly nonlinear response but very sensitive to small temperature changes.
2. High Sensitivity:
-More responsive than RTDs (Resistance Temperature Detectors) or thermocouples in certain ranges.
-Best suited for narrow to moderate temperature ranges (typically -50°C to 150°C, though some go higher).
3. Nonlinear Resistance-Temperature Curve
Applications of NTC Thermistors:
1.Temperature Sensing & Control:
-Used in thermostats, battery packs, automotive cooling systems, and medical devices.
2. Inrush Current Limiting:
-Acts as a self-regulating surge suppressor in power supplies (high resistance at startup, then drops as it heats up).
3.Consumer Electronics:
-Smartphones, laptops (battery temperature monitoring), and HVAC systems.
Advantages VS Disadvantages:
-Small size, fast response, and low cost.
-High sensitivity in its operating range.
-Nonlinearity requires calibration or lookup tables.
-Limited temperature range compared to RTDs/thermocouples.
-Self-heating can affect accuracy if not properly designed.
Contact us and learn more about our temperarture measurement.
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