The **THMR1395-R35** is a high-performance **NTC (Negative Temperature Coefficient) Thermistor**. These components are widely used for temperature sensing, compensation, and control in electronic circuits. ### 1. Key Technical Specifications The "R35" designation usually refers to its resistance value at a specific reference temperature. | Parameter | Specification (Typical) | | :--- | :--- | | **Type** | NTC Thermistor (Resistance decreases as temperature increases) | | **Resistance at 25°C** | 3.5k Ohms (Nominal) | | **Tolerance** | Usually ±1% to ±5% (depending on specific sub-series) | | **B-Constant** | Defines the slope of the resistance-temperature curve | | **Mounting Type** | Through-hole (Radial Leads) | | **Operating Temp Range** | -40°C to +125°C (Standard range) | --- ### 2. Functional Characteristics The THMR1395-R35 operates based on the physical properties of ceramic semiconductors. * **Sensitivity:** It provides a high change in electrical resistance per degree of temperature change, making it much more sensitive than RTDs (Resistance Temperature Detectors) or thermocouples in mid-range temperatures. * **Stability:** Designed for long-term stability in sensing circuits, ensuring that the resistance value does not drift significantly over the life of the product. * **Response Time:** Due to its small thermal mass, it reacts quickly to environmental temperature changes. --- ### 3. Typical Applications These parts are integrated into systems where thermal monitoring is critical for safety or performance: 1. **Battery Management Systems (BMS):** Monitoring the temperature of Li-ion cells during charging/discharging. 2. **HVAC Systems:** Air temperature sensing for climate control units. 3. **Industrial Automation:** Overheat protection for motors or power supplies. 4. **Medical Equipment:** Precise temperature monitoring in diagnostic tools. --- ### 4. Implementation Example To use this part in a digital system (like an Arduino or PLC), it is typically placed in a **Voltage Divider** circuit to convert resistance into a measurable voltage. ```cpp // Basic conversion logic for an NTC Thermistor float resistance = seriesResistor / ((1023 / adcValue) - 1); float steinhart; steinhart = resistance / nominalResistance; // (R/Ro) steinhart = log(steinhart); // ln(R/Ro) steinhart /= bConstant; // 1/B * ln(R/Ro) steinhart += 1.0 / (nominalTemperature + 273.15);// + (1/To) steinhart = 1.0 / steinhart; // Invert steinhart -= 273.15; // Convert to Celsius ```