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 NTC 200Ω 
 Temperature sensors 

Very high-resistance NTC thermistor for low-current applications and advanced temperature sensing systems.

 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 200KΩ sensor ?Operating principleTechnical SpecificationsWiring ConfigurationSelf-warmingApplication areas

What is a NTC 200KΩ sensor ?

The NTC 200 kΩ is a thermistor with a very high nominal resistance (200,000 Ω at 25 °C).

Its design provides extremely low power consumption, suitable for long-life sensors and battery-operated devices.

It offers remarkable thermal stability and high sensitivity in the range of 0–70 °C, while minimizing self-heating.

Operating principle

The resistance varies according to the classic exponential law:

R(T) = R₂₅ × e^{β (1/T - 1/T₂₅)}

where:

  • R₂₅ = 1000 Ω 
  • β ≈  3950 K
  • T in kelvins

The measurement is then linearized using the Steinhart–Hart equation, ensuring an accurate and stable reading.

Technical Specifications

Parameter
 Typical value

Nominal resistance (25 °C)

 200 000 Ω ±1 %
Constant β 3500–3900 K

Sensitive material

Metallic oxide (Mn, Ni, Co)

Type of case Epoxy / glass / film

Maximum measurement current

0,02 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 standard divider bridge for reading via a high impedance ADC input.

 +Vcc
   │
  [Rfixe]
   │────► ADC (µC)
  [NTC 200kΩ]
   │
  GND

Self-warming

Thanks to its extremely high resistance, self-heating is almost negligible (< 0.01 °C), ensuring lasting and stable accuracy.

Application areas

🔋 Low-energy IoT systems / autonomous sensors

🩺 Portable medical instrumentation

🌡️ Environmental and climate monitoring

⚙️ Slow regulation at very low current

🧠 High-precision embedded devices


Should I choose a 200KΩ sensor ?

Strengths points

  • 🔋 Infinitesimal consumption
         → Its very high resistance reduces the current to a few microamperes, ideal for battery-operated devices or autonomous solar sensors.
  • 🎯 Remarkable precision in the ambient area
         → Very stable between 0 and 70 °C, it offers excellent sensitivity and consistency for comfort or slow control measurements.
  • 💧 No self-heating
         → With a thermal dissipation of < 0.01 °C/mW, it allows for continuous reading without any measurable drift.
200KΩ sensors

Weaknesses points

  • 🐢 Slightly longer response time
    → Its high resistance results in a stabilization time longer than that of lower NTCs (10–50 kΩ).
  • 🧮 Requires digital processing
    → The exponential curve R/T requires the use of a calibration table or the Steinhart–Hart formula.
  • 🌡️ Less suitable for high temperatures
    → Its sensitivity decreases beyond 100 °C, making it less accurate for extreme industrial measurements.

Useful information

Here is some useful information regarding the 200KΩ sensors.

(NTC 100 kΩ at 25 °C, beta constant = 3950 K)

Temperature (°C) Resistance (Ω) Temperature (°C) Resistance (Ω)
−50 4 988 360 60 58 640
−40 3 160 680 70 44 120
−30 2 033 780 80 33 780
−20 1 341 640 90 26 040
−10 896 800 100 20 260
0 609 200 110 15 670
10 420 900 120 12 290
20 295 990 130 9 670
25 200 000 140 7 600
30 137 260 150 5 980
40 95 200 160 4 720
50 67 240 170 3 730

💡 Between 0 °C and 100 °C, the resistance decreases by a factor of approximately 30, following the classic exponential law of an NTC β ≈ 3950 K.

Class / Tolerance
 Tolerance at 25 °C (R25)
 Max error on T° (−40 → +125 °C)
 Typical usage
±1 % ±2 000 Ω ±0,2 K Medical and metrological applications
±2 % ±4 000 Ω ±0,4 K Industrial control systems
±3 % ±6 000 Ω ±0,6 K General electronic equipment
±5 % ±10 000 Ω ±1 K IoT devices and consumer electronics
🔹 Glass-encapsulated models are the most reliable for humid or fluctuating temperature environments.

Complete equation:

1/T = A + B · ln(R) + C · [ln(R)]³

Typical coefficients for NTC 200 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 = 137,260 Ω

ln(137260) = 11,83

1/T = 1,4051e−3 + 2,369e−4 (11,83) + 1,019e−7 (11,83)³ = 3,06e−3

T = 1 / 3,06e−3 = 327 K = 54 °C

✅ Measured temperature ≈ 54 °C


🔹 Example 2: Resistance from T

T = 80 °C = 353.15 K

R = R₂₅ · e^(β(1/T − 1/T₂₅))

R = 200000 · e^(3950 × (1/353,15 − 1/298,15)) = 33780 Ω

✅ Expected resistance: ≈ 33.8 kΩ

The 200 kΩ NTC is integrated into a voltage divider, often used for very low power measurements in standalone or battery-operated systems.

🔹 Typical components

Component
 Function
NTC 200 kΩ Temperature sensor
R fixed (200 kΩ)
 Reference resistance
Microcontroller (ADC)
 High impedance analog lecture
Capacitor 100 nF
 Noise filtering
Power Supply 3.3 / 5 V
 Stable and clean tension
🔹 Functional diagram (ASCII)
  +3.3V / +5V
       │
     [Rfixe]
       │────► ADC (microcontroller input)
     [NTC 200kΩ]
       │
      GND
💡 Thanks to its very high resistance, the measurement current remains below 20 µA, making this sensor ideal for low-power and long-duration systems.

 We integrate any sensor into any probe 

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 Smooth tube 

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Stick-in

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Thread

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Jacketed

PCBA Design

PCBA design

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Winding

More than 1,000,000 probes delivered in 2025

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