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 15kΩ 
 Temperature sensors 

Stable NTC thermistor for accurate temperature sensing in control systems and industrial environments.

 Maximum precision
+/- 0,20°K

 Minimum temperature
-50°C

 Maximum temperature
+150°C

 Minimum dimensions
2 x 10

Response time

Fast

 Drift

Low

 Self-warming
Low

Price
Low

What is a 15KΩ sensor ?Operating principleTechnical SpecificationsWiring ConfigurationSelf-warmingApplication areas

What is a 15KΩ sensor ?

The NTC 15 kΩ is a thermistor with a nominal resistance of 15,000 Ω at 25 °C, offering high stability and very low power consumption.

The higher the nominal resistance, the lower the measurement current — which significantly limits self-heating, even in continuous measurements.

This sensor is often used in low-power devices, portable instruments, or long-term acquisition systems.

Operating principle

As with all NTC thermistors, the resistance decreases with temperature according to the exponential law:

R(T) = R₂₅ × e^{β (1/T - 1/T₂₅)}

where. :

  • R₂₅ = 15000 Ω 
  • β ≈  3900 
  • T in Kelvins

This equation can be linearized using the simplified β formula or the Steinhart–Hart equation for accurate calculations.

Technical Specifications

Parameter
 Typical value

Nominal resistance (25 °C)

 15 000 Ω ±1 %
Constant β 3500–3900 K

Sensitive material

Metallic oxide (Mn, Ni, Co)

Type of case Epoxy / glass / pearl

Maximum measurement current

0.1 to 0.2 mA

Response time

0.3 to 1 s

Linearity

Exponential (non-linear)

Operating temperature

−50 → +150 °C

Lifetime

100,000 thermal cycles

Wiring Configuration

Used in a classic voltage divider bridge on a microcontroller, the 15 kΩ NTC can be read directly via the ADC for continuous and stable measurements.

 +Vcc
   │
  [Rfixe]
   │────► ADC (µC)
  [NTC 15kΩ]
   │
  GND

Self-warming

Thanks to a high resistance, the dissipation is extremely low.

Even under continuous reading, the self-heating remains below 0.02 °C — ideal for long-term precision measurements.

Application areas

🔋 Battery-powered autonomous systems / Long-duration IoT

🌡️ High-precision environmental sensors

🧠 Wearable instruments and medical devices

⚙️ Ambient or surface measurement (contact)

🏭 Thermal compensation in electronic modules


Should I choose a 15KΩ sensor ?

Strengths points

  • 🔋 Ultra-low consumption
         → With a resistance of 15 kΩ, the measurement current is very low, ideal for battery-operated devices and standalone systems.
  • 🎯 Very good thermal stability
         → Its drift is less than 0.05 K/year, ensuring stable and reproducible measurements even after several years of use.
  • 💧 Excellent behavior in continuous measurement
         → Thanks to its low self-heating (<0.02 °C), it can operate in continuous reading without compromising accuracy.
15kΩ Sensors

Weaknesses points

  • 📉 Less sensitive to rapid fluctuations
    → Its high resistance reduces the current flowing through, which slightly slows down the thermal response in certain dynamic applications.
  • 🌡️ Lower resolution at high temperature
    →Above 100 °C, the R/T curve becomes flatter, resulting in slightly lower accuracy without software compensation.
  • 🧩 Classical non-linearity of NTC
    → Requires a conversion table or a Steinhart–Hart formula for accurate temperature calculation.

Useful information

Here is some useful information regarding the 15KΩ sensors.

(NTC 15 kΩ at 25 °C, beta constant = 3950 K)

Temperature (°C) Resistance (Ω) Temperature (°C) Resistance (Ω)
−50 374 127 60 4 398
−40 237 052 70 3 308
−30 152 533 80 2 532
−20 100 624 90 1 953
−10 67 260 100 1 518
0 45 690 110 1 175
10 31 425 120 921
20 22 111 130 726
25 15 000 140 578
30 10 294 150 463
40 7 143 160 373
50 5 047 170 301

💡 Between 0 °C and 100 °C, the resistance is divided by about 30 — an exponential decay characteristic of an NTC β ≈ 3950.

Class / Tolerance
 Tolerance at 25 °C (R25)
 Max error on T° (−40 → +125 °C)
 Typical usage
±1 % ±150 Ω ±0,2 K Industrial or medical applications
±2 % ±300 Ω ±0,4 K Precise environmental measurement
±3 % ±450 Ω ±0,6 K Regulation Electronics
±5 % ±750 Ω ±1 K Security systems / home automation
🔹 Sealed glass models are recommended for superior stability and an annual drift of < 0.05 K.


Complete equation:

1/T = A + B · ln(R) + C · [ln(R)]³


Typical coefficients for NTC 15 kΩ (β = 3950 K):

  • A = 1.4051 × 10⁻³
  • B = 2.369 × 10⁻⁴
  • C = 1.019 × 10⁻⁷


🔹 Example 1: Temperature from R

R = 10,294 Ω

ln(10294) = 9,24

1/T = 1,4051e−3 + 2,369e−4 (9,24) + 1,019e−7 (9,24)³ = 3,04e−3

T = 1 / 3,04e−3 = 329,0 K = 55,9 °C

✅ Measured temperature: ≈ 56 °F


🔹 Example 2: Resistance from T

T = 80 °C = 353.15 K

R = R₂₅ · e^(β(1/T − 1/T₂₅))

R = 15000 · e^(3950 × (1/353,15 − 1/298,15)) = 2532 Ω

✅ Expected resistance: ≈ 2.53 kΩ

The NTC 15 kΩ is wired as a standard voltage divider.

Its high resistance allows for the use of larger reference values, limiting the measurement current for low-power devices.

🔹 Typical components

Component
 Function
NTC 15 kΩ Temperature sensor
R fixed (15 kΩ)
 Reference resistance
Microcontroller (ADC)
 Analog reading and conversion
100 nF capacitor
 Filtering
Power Supply 3.3 / 5 V
 Source stable
🔹 Functional diagram (ASCII)
  +3.3V / +5V
       │
     [Rfixe]
       │────► ADC (microcontroller input)     
	​[NTC 15kΩ]
       │
      GND
💡 The microcontroller calculates the temperature from the measured voltage, according to the characteristic curve or the Steinhart–Hart equation.

 We integrate any sensor into any probe 

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PCBA design

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