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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 an 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 3500–3950 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 

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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