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 50KΩ 
 Temperature sensors 

Precision NTC thermistor designed for accurate temperature measurement in medical and laboratory applications.

 Maximum precision
+/- 0,20°K

 Minimum temperature
-50°C

 Maximum temperature
+150°C

 Minimum dimensions
2 x 10

Response time

Medium

 Drift

Low

 Self-warming
Low

Price
Low

What is a NTC 50KΩ sensor ?Operating principleTechnical SpecificationsWiring ConfigurationSelf-warmingApplication areas

What is a NTC 50KΩ sensor ?

The NTC 50 kΩ is a thermistor with a very high nominal resistance (50,000 Ω at 25 °C).

Its design allows for almost zero power consumption, making it ideal for battery-powered systems or continuous operation.

This sensor offers remarkable thermal stability and negligible self-heating, making it perfect for applications requiring long-term reliability.

Operating principle

The resistance varies according to the exponential law:

R(T) = R₂₅ × e^{β (1/T - 1/T₂₅)}

  • R₂₅ = 50000 Ω 
  • β ≈ 3900 K
  • T in kelvins

The measurement is then linearized using the formula β or the Steinhart–Hart equation to obtain the temperature.

Technical specifications

Parameter Typical value

Nominal resistance (25 °C)

 50 000 Ω ±1 %
Constante β 3500–3950 K

Sensitive material

Metallic oxide (Mn, Ni, Co)

Type of case Epoxy / glass / ceramic

Maximum measurement current

0,05 mA

Response time

0.4 to 1 s

Linearity

Exponential

Operating temperature

−50 → +150 °C

Lifetime

100,000 thermal cycles

Wiring Configuration

The NTC 50 kΩ is connected in a voltage divider to an ADC input.

Its high resistance makes it particularly suitable for high-impedance circuits.

 +Vcc
   │
  [Rfixe]
   │────► ADC (µC)
  [NTC 50kΩ]
   │
  GND

Self-warming

Thanks to a very low current, self-heating is practically nonexistent (< 0.01 °C), ensuring a stable and reproducible measurement even after several hours.

Application areas

🔋 IoT sensors and battery-powered systems

🩺 Medical and diagnostic devices

🧠 High-precision measuring instruments

⚙️ Thermal control in sensitive electronics

🌡️ Long-term environmental monitoring


Should I choose a 50KΩ sensor ?

Strengths points

  • 🔋 Almost zero consumption
         → Its very high resistance limits the current to a few microamperes: ideal for battery-powered or solar-powered sensors.
  • 🎯 High stability and low drift→ Less than ±0.05 K/year drift: perfect for calibrated measurements and long-term applications.
  • 💧 No self-heating
         → Dissipation < 0.01 °C/mW, making it a reference sensor for precision-sensitive systems.
50kΩ sensors

Weaknesses points

  • 🐢 Slightly slower thermal response
         → Its high resistance slightly extends the stabilization time during rapid temperature variations.
  • 🧮 Pronounced non-linearity
         → Requires software compensation (R/T table or Steinhart–Hart equation) for accurate measurements.
  • Reduced sensitivity to high temperature
         → Beyond 120 °C, the resistance variation becomes weak, limiting the resolution of the analog signal.

Useful information

Here is some useful information regarding the 50KΩ sensors.

(NTC 30 kΩ at 25 °C, beta constant = 3950 K)

Temperature (°C) Resistance (Ω) Temperature (°C) Resistance (Ω)
−50 1 247 090 60 14 660
−40 790 173 70 11 030
−30 505 845 80 8 450
−20 335 420 90 6 500
−10 223 950 100 5 130
0 151 660 110 4 080
10 104 370 120 3 260
20 73 650 130 2 610
25 50 000 140 2 110
30 34 290 150 1 720
40 23 790 160 1 410
50 16 850 170 1 160

💡 Between 0 °C and 100 °C, the resistance is divided by about 30 — typical of an NTC with β ≈ 3950 K.

Class / Tolerance
 Tolerance at 25 °C (R25)
 Max error on T° (−40 → +125 °C)
 Typical usage
±1 % ±500 Ω ±0,2 K Medical and laboratory sensors
±2 % ±1 000 Ω ±0,4 K Industrial control
±3 % ±1 500 Ω ±0,6 K General Electronics
±5 % ±2 500 Ω ±1 K Environmental measures
🔹 Sealed glass models ensure optimal thermal stability and an annual drift of < 0.05 K.

Complete formula:

1/T = A + B · ln(R) + C · [ln(R)]³

Typical coefficients for NTC 50 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 = 34,290 Ω

ln(34290) = 10,44

1/T = 1,4051e−3 + 2,369e−4 (10,44) + 1,019e−7 (10,44)³ = 3,03e−3

T = 1 / 3,03e−3 = 329,7 K = 56,5 °C

✅ Measured temperature ≈ 56 °C


🔹 Example 2: Resistance from T

T = 80 °C = 353.15 K

R = R₂₅ · e^(β(1/T − 1/T₂₅))

R = 50000 · e^(3950 × (1/353,15 − 1/298,15)) = 8450 Ω

✅ Expected resistance: ≈ 8.45 kΩ

The NTC 50 kΩ is integrated into a standard voltage divider.

Its high resistance makes it ideal for high-impedance ADCs and very low-power devices.

🔹 Typical components

Component
 Function
NTC 50 kΩ Temperature sensor
R fixed (50 kΩ)
 Reference resistance
Microcontroller (ADC)
 Analog Lecture
100 nF capacitor
 Filtering
Power Supply 3.3 / 5 V
 Tension stable
🔹 Functional diagram (ASCII)
  +3.3V / +5V
       │
     [Rfixe]
       │────► ADC (microcontroller input)
     [NTC 50kΩ]
       │
      GND

💡 The measured voltage corresponds to the temperature according to the R/T curve.

Due to its high resistance, the measurement current is extremely low, which minimizes any error from self-heating.

 We integrate any sensor into any probe 

Smooth tube probe

 Smooth tube 

Waterproof probe

 Waterproof

Bayonet probe

 Bayonet

Slot probe

 Slot

Ambient probe

 Atmosphere

Connection head probe

Termal block

Stick-in probe

Stick-in

Thread probe

Thread

Contact probe

Contact

Jacketed probe

Jacketed

PCBA Design

PCBA design

Winding probe

Winding

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