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 5KΩ 
 Temperature sensors 

High-sensitivity NTC thermistor ideal for HVAC systems, appliances, and temperature regulation applications.

 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 5KΩ sensor ?Operating principleTechnical SpecificationsWiring ConfigurationSelf-warmingApplication areas

What is a 5KΩ sensor ?

The NTC 5 kΩ is a negative temperature coefficient thermistor with a nominal resistance of 5,000 Ω at 25 °C.

It combines accuracy, stability, and low self-heating, making it particularly suitable for battery-powered measurement systems or devices requiring long longevity.

Operating principle

Its resistance varies according to the exponential law:

R(T) = R₂₅ × e^{β (1/T - 1/T₂₅)}

where:

  • R₂₅ = 5000 Ω 
  • β ≈ 3900 K
  • T in kelvins

Technical Specifications

Parameter
 Typical value

Nominal resistance (25 °C)

 5000 Ω ±1 %
Constant β 3500–3900 K

Sensitive material

Metallic oxide (Mn, Ni, Co)

Type of case Epoxy / glass / ceramic

Maximum measurement current

0,25 mA (to limit self-heating)

Response time

0.3 to 1 s depending on the medium

Linearity

Exponential (non-linear)

Operating temperature

−50 → +150 °C

Lifetime

100,000 thermal cycles

Wiring Configuration

Still in 2 wires, the sensor is integrated into a voltage divider read by an analog input of the microcontroller.

 +Vcc
   │
  [Rfixe]
   │────► ADC
  [NTC 5kΩ]
   │
  GND

Self-warming

Thanks to its high resistance, the measurement current remains very low, limiting dissipation to <0.02 °C,

which ensures reliable and stable measurements even during continuous operation.

Application areas

⚙️ HVAC equipment and precision thermal control

🧠 Low-power embedded sensors (IoT, battery)

💧 Probes for humid or liquid environments

🔋 Power electronics (thermal compensation)

🏭 Industrial control applications


Should I choose a 5KΩ sensor ?

Strengths points

  • 🔋 Very low power consumption
         → Thanks to its higher resistance, the measurement current is minimal — perfect for battery-powered systems or standalone devices.
  • 🎯 Stability and precision in the ambient zone
         → The NTC 5 kΩ offers very good accuracy around 20–80 °C, ideal for thermal comfort or environmental measurement applications.
  • 💧 Low self-heating and long lifespan
         → With a thermal dissipation of less than 0.02 °C/mW, it ensures stable measurement even during continuous operation.
5kΩ sensors

Weaknesses points

  • 📉 Pronounced non-linearity
    → Like all NTCs, it requires software linearization (β formula or table) to obtain accurate results.
  • 🌡️ Reduced sensitivity to high temperature
    → The slope of resistance variation decreases beyond 100 °C, reducing the resolution in the high ranges.
  • 🔋 Less suitable for extreme environments
    → Most models are limited to a maximum of 150 °C, unlike RTDs or thermocouples that can go beyond 600 °C.

Useful information

Here is some useful information regarding the 5KΩ sensors.

(NTC 5 kΩ at 25 °C, beta constant = 3950 K)

Temperature (°C) Resistance (Ω) Temperature (°C) Resistance (Ω)
−50 124 709 60 1 466
−40 79 017 70 1 103
−30 50 845 80 845
−20 33 542 90 650
−10 22 395 100 513
0 15 166 110 408
10 10 437 120 326
20 7 365 130 261
25 5 000 140 211
30 3 429 150 172
40 2 379 160 141
50 1 685 170 116

💡Entre −20 °C et +100 °C, la résistance est divisée par environ 65 — typique d’une thermistance NTC à β ≈ 3950.


Class / Tolerance
 Tolerance at 25 °C (R25)
 Max error on T° (−40 → +125 °C)
 Typical usage
±1 % ±50 Ω ±0,2 K Industrial precision measurement
±2 % ±100 Ω ±0,4 K Fine thermal regulation
±3 % ±150 Ω ±0,6 K Embedded electronics
±5 % ±250 Ω ±1 K Consumer applications / HVAC

🔹 Glass-encased models offer the best stability and an annual drift of < 0.05 K.

Complete formula:

1/T = A + B · ln(R) + C · [ln(R)]³


Typical coefficients (NTC 5 kΩ, β = 3950 K):

  • A = 1,4051 × 10⁻³
  • B = 2,369 × 10⁻⁴
  • C = 1,019 × 10⁻


🔹 Example 1: temperature from R

R = 3,429 Ω

ln(3429) = 8,14

1/T = 1,4051e−3 + 2,369e−4 8,14) + 1,019e−7 (8,14)³ = 3,02e−3

T = 1 / 3,02e−3 = 331 K = 57,9 °C

✅ Measured temperature ≈ 58 °C


🔹 Example 2: resistance from T

T = 80 °C = 353.15 K

R = R₂₅ · e^(β(1/T − 1/T₂₅))

R = 5000 · e^(3950 × (1/353,15 − 1/298,15)) = 845 Ω

✅ Expected resistance ≈ 845 Ω

The NTC 5 kΩ is commonly integrated into a voltage divider connected to an analog-to-digital converter.

It can be used in very low power circuits or IoT modules.

🔹 Typical components

Component
 Function
NTC 5 kΩ
 Temperature sensor
R fixed (5 kΩ)
 Reference resistance
Microcontroller (ADC)
 Voltage reading
100 nF capacitor
 Filtering
Power Supply 3.3 / 5 V
 Tension stable
🔹 Functional diagram (ASCII)
  +3.3V / +5V
       │
     [Rfixe]
       │────► ADC (µC)
     [NTC 5kΩ]
       │
      GND
💡 The ADC measures the intermediate voltage to determine the temperature using the calibration curve or the Steinhart–Hart formula.

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