10K Ohm NTC Thermistor Temperature Sensor (NTC-10K Ω@ 25°C, B3950)

Accurately monitor temperature in your electronic projects with the 10K Ohm NTC Thermistor. Operating on the principle of Negative Temperature Coefficient (NTC), this high-precision sensor decreases its electrical resistance as ambient temperature rises. Calibrated to $10 ext{k}Omega$ at $25^circ ext{C}$ with a standard B25/85 $B_{25/85} = 3950 ext{K}$ thermal constant, it delivers reliable thermal measurement across a broad range of $-40^circ ext{C}$ to $+125^circ ext{C}$ . Featuring epoxy coating and high-grade copper lead wires, it interfaces seamlessly with analog input pins on Arduino, ESP32, STM32, and 3D printer mainboards (RepRap/Marlin) via a simple voltage divider circuit.

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Tags 10k NTC Thermistor 10K3950 Temperature Sensor NTC 10K B3950 Probe 3D Printer Thermistor Arduino Temperature Sensor NTC Epoxy Bead Thermistor 10k Thermal Resistor 10k Ohm

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Product Details :

The 10K Ohm NTC Thermistor is a cost-effective, versatile thermal sensing component widely used for temperature measurement, compensation, and over-temperature protection. Fabricated from sintered metal oxide semiconductor materials encased in a protective black epoxy bead, it offers rapid thermal response times and high measurement sensitivity.

With a nominal resistance ( $R_{25}$ ) of $10,000 Omega$ at $25^circ ext{C}$ and a standard B-value of $3950 ext{K}$ , this component converts temperature variations directly into non-linear electrical resistance changes. By placing the thermistor in series with a fixed $10 ext{k}Omega$ balance resistor to create a simple voltage divider, microcontrollers can sample the resulting analog voltage via an Analog-to-Digital Converter (ADC) and apply the Steinhart-Hart equation or Beta Parameter equation to calculate absolute temperatures with sub-degree accuracy.

Key Features and Benefits

High Measurement Sensitivity: Large change in electrical resistance per degree change in temperature ensures accurate analog readings.
Standard $B_{25/85} = 3950 ext{K}$ Calibration: Natively supported in Marlin/3D printing firmware and standard microcontroller thermal libraries.
Wide Operating Range: Reliable thermal monitoring performance from $-40^circ ext{C}$ to $+125^circ ext{C}$ (up to $+300^circ ext{C}$ for glass-encapsulated variants).
Compact & Fast Response: Small thermal mass enables near-instantaneous detection of temperature fluctuations.
Easy Microcontroller Integration: Connects to any ADC pin on Arduino, ESP32, Raspberry Pi (via ADC module), or STM32 using a single balance resistor.

Technical Specifications

Feature Component	Specification Details
Sensor Type	Negative Temperature Coefficient (NTC) Thermistor
Nominal Resistance ( $R_{25}$ )	$10 ext{ k}Omega pm 1%$ at $25^circ ext{C}$
Beta Value ( $B_{25/85}$ )	$3950 ext{ K} pm 1%$
Operating Temperature Range	$-40^circ ext{C to } +125^circ ext{C}$
Thermal Time Constant ( $au$ )	$le 10 - 15 ext{ seconds}$ (in calm air)
Dissipation Constant	$pprox 2 ext{ to } 3 ext{ mW/}^circ ext{C}$ (in air)
Maximum Power Rating	$45 ext{ mW}$ at $25^circ ext{C}$
Insulation Resistance	$> 50 ext{ M}Omega$

Wiring & Mathematical Interface Guide

1. Voltage Divider Circuit Connection:

To read the thermistor with a microcontroller ( $5 ext{V}$ or $3.3 ext{V}$ logic):

       +VCC (5V or 3.3V)
          |
         [ ]  10k Ohm Fixed Resistor (1% Precision)
          |
          +-----> Connect to MCU Analog Pin (e.g., A0)
          |
         (S)  10k NTC Thermistor
          |
         GND

2. Temperature Calculation Formula (Beta Equation):

The resistance $R_T$ at absolute temperature $T$ (in Kelvin) is governed by:

rac{1}{T} = rac{1}{T_0} + rac{1}{eta} lnleft( rac{R_T}{R_0} ight)

$T_0 = 298.15 ext{ K}$ ( $25^circ ext{C}$ )
$R_0 = 10,000 Omega$
$eta = 3950 ext{ K}$
$Temperature (^circ ext{C}) = T - 273.15$

Applications

3D Printers & CNC Machinery: Hotend and heated bed temperature sensing (Marlin Thermistor Type 1).
HVAC & Climate Control: Ambient room temperature monitoring, thermostats, and air conditioning units.
Home Appliances: Temperature sensing in refrigerators, electric kettles, water heaters, and coffee makers.
Battery Management Systems (BMS): Over-temperature protection monitoring for Lithium-ion / LiFePO4 battery packs.
IoT Environmental Monitoring: Smart weather stations and indoor air quality monitoring nodes.