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 2KΩ 
 Temperature sensors 

Compact NTC thermistor offering reliable temperature sensing for embedded systems and electronic circuits.

 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 2KΩ sensor ?Operating principleTechnical SpecificationsWiring ConfigurationSelf-warmingApplication areas

What is a 2KΩ sensor ?

The NTC 2 kΩ is a negative temperature coefficient thermistor, presenting 2,000 Ω at 25 °C.

It offers higher sensitivity than the 1 kΩ, while maintaining stable and predictable behavior in the range of −50 to +150 °C.

The higher the nominal resistance, the lower the measurement current, reducing self-heating.

Operating principle

Like all NTCs, the resistance decreases exponentially with temperature according to the Steinhart–Hart law:

1/T = A + B · ln(R) + C · [ln(R)]³

or according to the simplified model with constant β:

R(T) = R₂₅ × e^{β (1/T - 1/T₂₅)}

where:

• R₂₅ = 2000 Ω 

• β ≈  3900 K

Technical Specifications

Parameter
 Typical value

Nominal resistance (25 °C)

 2000 Ω ±1 %
Constant β 3500–3900 K

Sensitive material

Metallic oxide (Mn, Ni, Co)

Type of case Epoxy / glass / pearl

Maximum measurement current

0,5 mA (to limit self-heating)

Response time

0.3 to 1 s depending on the medium

Linearity

Non linear

Operating temperature

−50 → +150 °C

Lifetime

100,000 thermal cycles

Wiring Configuration

The 2 kΩ NTCs are generally wired in a voltage divider for a voltage reading proportional to the temperature.

 +Vcc
   │
  [Rfixe]
   │────► ADC (µC)
  [NTC 2kΩ]
   │
  GND

The output voltage Vout depends directly on the resistance of the thermistor:

V_out = V_cc × (R_NTC / (R_fixe + R_NTC))

Self-warming

Thanks to a higher resistance, the measurement current is half that of a 1 kΩ, further limiting self-heating to < 0.03 °C.

Application areas

⚙️ Regulation and temperature control in embedded electronics

🧱 Thermal measurement in printed circuits and power supplies

💧 Probes for fluids, air, or gas

🧠 Thermal compensation in converters or sensors

🔋 Battery monitoring and power modules


Should I choose a 2KΩ sensor ?

Strengths points

  • ⚙️ Increased thermal sensitivity
         → The 2 kΩ offers better measurement resolution around ambient temperature than the 1 kΩ, making it ideal for fine regulation systems.
  • 🔥 Low self-heating
         → Thanks to its doubled resistance, the current passing through the sensor is reduced, limiting the internal thermal drift to less than 0.03 °C.
  • 💶 Good cost/accuracy compromise
         → An excellent price/stability/speed ratio, perfect for industrial devices, HVAC, and consumer use.
2kΩ sensors

Weaknesses points

  • 📉 Nonlinear response
    → Like all NTCs, it requires software correction (table or equation β) to provide an accurate temperature.
  • 🌡️ Restricted use area
    → Less suitable for environments above +150 °C, unlike Pt100 type RTDs.
  • 🔋 Sensitivity to dissipation
    → The errors may increase if the fixed resistance of the bridge is not precisely chosen.

Useful information

Here is some useful information regarding the 2KΩ sensors.

(NTC 2 kΩ at 25 °C, beta constant = 3950 K)

Temperature (°C) Resistance (Ω) Temperature (°C) Resistance (Ω)
−50 49 884 60 586
−40 31 606 70 441
−30 20 338 80 337
−20 13 416 90 260
−10 8 968 100 203
0 6 091 110 160
10 4 189 120 127
20 2 948 130 101
25 2 000 140 81
30 1 372 150 65
40 952 160 52
50 672 170 42

💡 On observe une décroissance exponentielle de la résistance : typique d’une thermistance NTC.

Class / Tolerance
 Tolerance at 25 °C (R25)
 Max error on T° (−40 → +125 °C)
 Typical usage
±1 % ±20 Ω ±0,2 K Instrumentation / precision measurement
±2 % ±40 Ω ±0,4 K Industrial Control / HVAC
±3 % ±60 Ω ±0,6 K Embedded electronics
±5 % ±100 Ω ±1 K Consumer applications / security
🔹 The sealed glass versions ensure the best long-term stability (≤ 0.05 K/year).

General equation:

1/T = A + B · ln(R) + C · [ln(R)]³


For an NTC 2 kΩ (β = 3950 K), typical coefficient:

  • A = 1,4051 × 10⁻³
  • B = 2,369 × 10⁻⁴
  • C = 1,019 × 10⁻⁷


🔹 Example 1: temperature from R

R = 1372 Ω

ln(1372) = 7,224

1/T = 1,4051e−3 + 2,369e−4 (7,224) + 1,019e−7 (7,224)³ = 3,09e−3

T = 323,7 K = 50,6 °C

✅ Measured temperature ≈ 50 °C


🔹 Example 2: resistance from T

T = 80 °C = 353.15 K

R = R₂₅ · e^(β(1/T − 1/T₂₅))

R = 2000 · e^(3950 × (1/353,15 − 1/298,15)) = 337 Ω

✅ Expected resistance ≈ 337 Ω

The 2 kΩ NTC is commonly used in a voltage divider connected to an ADC converter (microcontroller or measurement module).

🔹 Typical components

Composant Function
NTC 2 kΩ Temperature detection
R fixed (2 kΩ) Bridge reference
Microcontroller Lecture ADC 10–12 bits
Power Supply 3.3 / 5 V Source stable
100 nF capacitor Noise filtering
🔹 Functional diagram (ASCII)
  +3.3V / +5V
       │
     [Rfixe]
       │────► ADC (microcontroller input)
     [NTC 2kΩ]
       │
      GND
💡 The microcontroller calculates the temperature from the measured voltage using the Steinhart–Hart equation or a calibrated table.

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