Curve 47
Curve 47 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 47
R/T Specifications
| °C | Resistance Ratio Rt / R25 | NTC (%/°C) | Point Matched Resistance Mfg. Tol. Adder (±%) | Interchangeable T2A Code ±°C Tol. |
|---|---|---|---|---|
| -50 | 83.3790 | -7.42 | 7.7 | 0.65 |
| -45 | 57.8828 | -7.18 | 6.2 | 0.60 |
| -40 | 40.6707 | -6.94 | 5.6 | 0.54 |
| -35 | 28.9074 | -6.72 | 5.1 | 0.49 |
| -30 | 20.7731 | -6.50 | 4.5 | 0.45 |
| -25 | 15.0850 | -6.30 | 4.0 | 0.39 |
| -20 | 11.0646 | -6.10 | 3.4 | 0.35 |
| -15 | 8.19383 | -5.91 | 2.9 | 0.30 |
| -10 | 6.12371 | -5.74 | 2.5 | 0.25 |
| -5 | 4.61689 | -5.56 | 2.0 | 0.22 |
| 0 | 3.51020 | -5.40 | 1.6 | 0.20 |
| 5 | 2.69037 | -5.24 | 1.3 | 0.20 |
| 10 | 2.07803 | -5.09 | 1.0 | 0.20 |
| 15 | 1.61702 | -4.94 | 0.7 | 0.20 |
| 20 | 1.26728 | -4.80 | 0.3 | 0.20 |
| 25 | 1.00000 | -4.67 | 0.0 | 0.20 |
| 30 | 0.79430 | -4.54 | 0.3 | 0.20 |
| 35 | 0.63490 | -4.42 | 0.6 | 0.20 |
| 40 | 0.51059 | -4.30 | 0.9 | 0.20 |
| 45 | 0.41302 | -4.18 | 1.2 | 0.20 |
| 50 | 0.33598 | -4.07 | 1.4 | 0.20 |
| 55 | 0.27479 | -3.97 | 1.7 | 0.20 |
| 60 | 0.22593 | -3.87 | 1.9 | 0.20 |
| 65 | 0.18669 | -3.77 | 2.2 | 0.20 |
| 70 | 0.15502 | -3.67 | 2.4 | 0.20 |
| 75 | 0.12932 | -3.58 | 2.6 | 0.22 |
| 80 | 0.10837 | -3.49 | 2.8 | 0.25 |
| 85 | 0.09121 | -3.41 | 3.1 | 0.28 |
| 90 | 0.07709 | -3.32 | 3.3 | 0.32 |
| 95 | 0.06542 | -3.24 | 3.5 | 0.36 |
| 100 | 0.05574 | -3.17 | 3.7 | 0.41 |
| 105 | 0.04767 | -3.09 | 3.9 | 0.45 |
| 110 | 0.04091 | -3.02 | 4.1 | 0.50 |
| 115 | 0.03524 | -2.95 | 4.3 | 0.55 |
| 120 | 0.03046 | -2.88 | 4.4 | 0.60 |
| 125 | 0.02642 | -2.82 | 4.6 | 0.66 |
| 130 | 0.02299 | -2.75 | 4.7 | 0.72 |
| 135 | 0.02006 | -2.69 | 4.9 | 0.77 |
| 140 | 0.01757 | -2.63 | 5.0 | 0.85 |
| 145 | 0.01542 | -2.57 | 5.2 | 0.95 |
| 150 | 0.01358 | -2.52 | 5.4 | 1.05 |
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 ±11.6 % tolerance at 0 °C. Point matched thermistors should typically not cycle or operate continuously above 105 °C.
Interchangeable T2A Code – An interchangeable tolerance means that a thermistor has a temperature tolerance specified over a temperature range. For example, a “T2A” code indicates a ±0.2 °C temperature tolerance from 0 °C to 70 °C. Typically, interchangeable thermistors should not cycle or operate continuously above their specified temperature range.