Curve 38
Curve 38 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 38
R/T Specifications
| °C | Resistance Ratio Rt / R25 | NTC (%/°C) | Point Matched Resistance Mfg. Tol. Adder (±%) | Interchangeable T5A Code ±°C Tol. |
|---|---|---|---|---|
| -50 | 38.99 | -6.18 | 8.2 | 1.16 |
| -45 | 28.77 | -5.97 | 7.5 | 1.04 |
| -40 | 21.45 | -5.77 | 6.8 | 0.94 |
| -35 | 16.15 | -5.58 | 6.2 | 0.85 |
| -30 | 12.27 | -5.40 | 5.6 | 0.77 |
| -25 | 9.411 | -5.22 | 5.0 | 0.70 |
| -20 | 7.278 | -5.06 | 4.4 | 0.64 |
| -15 | 5.675 | -4.90 | 3.9 | 0.59 |
| -10 | 4.459 | -4.75 | 3.3 | 0.55 |
| -5 | 3.530 | -4.60 | 2.8 | 0.52 |
| 0 | 2.815 | -4.46 | 2.3 | 0.50 |
| 5 | 2.260 | -4.33 | 1.8 | 0.50 |
| 10 | 1.826 | -4.20 | 1.2 | 0.50 |
| 15 | 1.485 | -4.07 | 0.8 | 0.50 |
| 20 | 1.215 | -3.95 | 0.4 | 0.50 |
| 25 | 1.000 | -3.84 | 0.0 | 0.50 |
| 30 | 0.8275 | -3.73 | 0.4 | 0.50 |
| 35 | 0.6885 | -3.63 | 0.8 | 0.50 |
| 40 | 0.5758 | -3.53 | 1.2 | 0.50 |
| 45 | 0.4839 | -3.43 | 1.7 | 0.50 |
| 50 | 0.4086 | -3.33 | 2.2 | 0.50 |
| 55 | 0.3466 | -3.24 | 2.6 | 0.50 |
| 60 | 0.2954 | -3.16 | 3.0 | 0.50 |
| 65 | 0.2528 | -3.07 | 3.3 | 0.50 |
| 70 | 0.2172 | -2.99 | 3.6 | 0.50 |
| 75 | 0.1874 | -2.92 | 3.9 | 0.53 |
| 80 | 0.1622 | -2.84 | 4.3 | 0.57 |
| 85 | 0.1410 | -2.77 | 4.6 | 0.62 |
| 90 | 0.1230 | -2.70 | 4.9 | 0.68 |
| 95 | 0.1076 | -2.63 | 5.2 | 0.75 |
| 100 | 0.0945 | -2.57 | 5.5 | 0.83 |
| 105 | 0.0832 | -2.51 | 5.8 | 0.92 |
| 110 | 0.0735 | -2.45 | 6.1 | 1.02 |
| 115 | 0.0652 | -2.39 | 6.4 | 1.13 |
| 120 | 0.0579 | -2.33 | 6.7 | 1.25 |
| 125 | 0.0516 | -2.28 | 6.9 | 1.37 |
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 ±7.3 % tolerance at 0 °C. Point matched thermistors should typically not cycle or operate continuously above 105 °C.
Interchangeable T5A Code – An interchangeable tolerance means that a thermistor has a temperature tolerance specified over a temperature range. For example, a “T5A” code indicates a ±0.5 °C temperature tolerance from 0 °C to 70 °C. Typically, interchangeable thermistors should not cycle or operate continuously above their specified temperature range.