Curve 35
Curve 35 R/T Specifications
Updated Nov 5, 2026
4168 Avenida de la Plata, Suite 107
Oceanside, California 92056
Phone: 760.509.4468
North Star Sensors Curve 35
R/T Specifications
| °C | Resistance Ratio Rt / R25 | NTC (%/°C) | Point Matched Resistance Mfg. Tol. Adder (±%) | Interchangeable T9A Code ±°C Tol. |
|---|---|---|---|---|
| -50 | 27.54 | -5.57 | 8.2 | 2.32 |
| -45 | 20.94 | -5.39 | 7.5 | 2.08 |
| -40 | 16.07 | -5.21 | 6.8 | 1.88 |
| -35 | 12.44 | -5.04 | 6.2 | 1.70 |
| -30 | 9.707 | -4.87 | 5.6 | 1.54 |
| -25 | 7.638 | -4.72 | 5.0 | 1.40 |
| -20 | 6.056 | -4.57 | 4.4 | 1.28 |
| -15 | 4.837 | -4.42 | 3.9 | 1.18 |
| -10 | 3.891 | -4.29 | 3.3 | 1.10 |
| -5 | 3.151 | -4.15 | 2.8 | 1.04 |
| 0 | 2.568 | -4.04 | 2.3 | 1.00 |
| 5 | 2.103 | -3.94 | 1.8 | 1.00 |
| 10 | 1.732 | -3.82 | 1.2 | 1.00 |
| 15 | 1.434 | -3.71 | 0.8 | 1.00 |
| 20 | 1.195 | -3.61 | 0.4 | 1.00 |
| 25 | 1.000 | -3.50 | 0.0 | 1.00 |
| 30 | 0.8413 | -3.41 | 0.4 | 1.00 |
| 35 | 0.7113 | -3.31 | 0.8 | 1.00 |
| 40 | 0.6042 | -3.22 | 1.2 | 1.00 |
| 45 | 0.5155 | -3.13 | 1.7 | 1.00 |
| 50 | 0.4417 | -3.05 | 2.2 | 1.00 |
| 55 | 0.3800 | -2.97 | 2.6 | 1.00 |
| 60 | 0.3282 | -2.89 | 3.0 | 1.00 |
| 65 | 0.2845 | -2.82 | 3.3 | 1.00 |
| 70 | 0.2475 | -2.75 | 3.6 | 1.00 |
| 75 | 0.2161 | -2.68 | 3.9 | 1.06 |
| 80 | 0.1893 | -2.62 | 4.3 | 1.14 |
| 85 | 0.1663 | -2.55 | 4.6 | 1.24 |
| 90 | 0.1466 | -2.49 | 4.9 | 1.36 |
| 95 | 0.1297 | -2.43 | 5.2 | 1.50 |
| 100 | 0.1150 | -2.37 | 5.5 | 1.66 |
Column Heading Definitions:
Resistance Ratio – The ratio of the resistance at temperature “t” to the resistance at 25 °C. To determine the resistance of a thermistor at a temperature point other than 25 °C, multiply the given resistance ratio by the resistance at 25 °C.
NTC – The Negative Temperature Coefficient of resistance is the % change in resistance per change in temperature, expressed in units of −%/°C. To determine the approximate % resistance tolerance of a thermistor at a particular temperature, multiply the given NTC value by the temperature tolerance at that temperature.
Point Matched – For thermistors with a specified tolerance at a single temperature point, the manufacturing tolerance is used to determine the tolerance at other temperature points. Typically, thermistors are specified at 25 °C. To determine the resistance tolerance at another temperature point, add the manufacturing tolerance to the specified point matched tolerance. For example, a thermistor with a ±10 % resistance tolerance at 25 °C has a ±12.3 % tolerance at 0 °C. Point matched thermistors should typically not cycle or operate continuously above 105 °C.
Interchangeable T9A Code – An interchangeable tolerance means that a thermistor has a temperature tolerance specified over a temperature range. For example, a “T9A” code indicates a ±1.0 °C temperature tolerance from 0 °C to 70 °C. Typically, interchangeable thermistors should not cycle or operate continuously above their specified temperature range.