Thermistor 103J 10K Ohm

The Thermistor 103J 10K Ohm is a temperature-sensitive resistor with a nominal resistance of 10 kΩ, marked with the code 103J. Its resistance changes noticeably as it warms up or cools down, so measuring the resistance tells you the temperature. 10 kΩ is one of the most common thermistor values for Arduino temperature sensing, over-heat protection and fan control.

Thermistor 103J 10K Ohm Specifications

• Nominal resistance: 10 kΩ (10,000 ohms), normally specified at 25 °C
• Value code: 103 = 10 followed by 3 zeros, in ohms
• Tolerance code: J = ±5%
• Type: thermistor (temperature-dependent resistor)
• Leads: 2, no polarity
• Pack size: 1 piece

Thermistor 103J 10K Ohm Applications

• Temperature measurement with Arduino and ESP32 analog inputs
• Over-temperature protection for power supplies, chargers and motors
• Thermostats and fan speed control
• Battery pack and heatsink temperature monitoring
• Electronics lab experiments with sensors

What's in the Box

• 1 × 10 kΩ (103J) thermistor

Tip: Wire it in a voltage divider with a fixed 10 kΩ resistor between 5 V (or 3.3 V) and GND and read the midpoint with an analog input; at 25 °C you will read about half the supply. Check with a multimeter which way the resistance moves when you warm it with your fingers (it falls for an NTC type and rises for a PTC type), then calibrate against a known thermometer.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.