Features
- 10KΩ nominal resistance at 25°C.
- 3950K Beta value (B25/50).
- ±5% resistance tolerance.
- Negative Temperature Coefficient (NTC) operation.
- Fast thermal response with high sensitivity.
- Excellent long-term stability and reliability.
- Compact epoxy-coated bead construction.
- Wide operating temperature range.
- Low power consumption.
- Compatible with Arduino, ESP32, Raspberry Pi, and other microcontrollers.
Principle of Operation
The MF5A-3 is a Negative Temperature Coefficient (NTC) thermistor, meaning its electrical resistance decreases as temperature increases. By placing the thermistor in a voltage divider circuit, a microcontroller can measure the changing voltage using an analog input and calculate the corresponding temperature using either the Beta equation or a lookup table.
Due to its high sensitivity and fast response time, the thermistor provides accurate temperature measurements over a wide operating range, making it suitable for monitoring, protection, and temperature compensation applications in both consumer and industrial electronics.
Applications
- Digital thermometers
- Temperature monitoring systems
- Battery temperature sensing
- 3D printer hotend and heated bed monitoring
- HVAC systems
- Household appliances
- Industrial control equipment
- Temperature compensation circuits
- Arduino and ESP32 projects
- IoT environmental monitoring devices
Pinout
| Pin | Function |
|---|---|
| Lead 1 | Thermistor terminal (non-polarized) |
| Lead 2 | Thermistor terminal (non-polarized) |
Wiring
The thermistor is typically connected as one resistor in a voltage divider. One lead is connected to the supply voltage, while the other connects to an analog input and a fixed resistor (typically 10KΩ) to ground. The analog voltage changes with temperature, allowing the microcontroller to determine the measured temperature.
| Connection | Description |
|---|---|
| Lead 1 | Connect to 3.3V or 5V supply |
| Lead 2 | Connect to Analog Input (A0) and a 10KΩ resistor to GND |
| Fixed Resistor | 10KΩ resistor forming a voltage divider |
Specifications
| Product Type | NTC Thermistor |
| Model | MF5A-3 |
| Resistance @ 25°C | 10KΩ |
| Beta Value (B25/50) | 3950K |
| Resistance Tolerance | ±5% |
| Thermistor Type | Negative Temperature Coefficient (NTC) |
| Operating Temperature | -40°C to +125°C |
| Package Type | Epoxy-Coated Bead with Radial Leads |
| Lead Type | Non-Polarized |
| Applications | Temperature Measurement, Compensation, Protection, and Control |
Resources
- NTC Thermistor Theory: https://en.wikipedia.org/wiki/Thermistor
- Arduino IDE: https://www.arduino.cc/en/software
- Steinhart–Hart Equation: https://en.wikipedia.org/wiki/Steinhart%E2%80%93Hart_equation
Features
- 10KΩ nominal resistance at 25°C.
- 3950K Beta value (B25/50).
- ±5% resistance tolerance.
- Negative Temperature Coefficient (NTC) operation.
- Fast thermal response with high sensitivity.
- Excellent long-term stability and reliability.
- Compact epoxy-coated bead construction.
- Wide operating temperature range.
- Low power consumption.
- Compatible with Arduino, ESP32, Raspberry Pi, and other microcontrollers.
Principle of Operation
The MF5A-3 is a Negative Temperature Coefficient (NTC) thermistor, meaning its electrical resistance decreases as temperature increases. By placing the thermistor in a voltage divider circuit, a microcontroller can measure the changing voltage using an analog input and calculate the corresponding temperature using either the Beta equation or a lookup table.
Due to its high sensitivity and fast response time, the thermistor provides accurate temperature measurements over a wide operating range, making it suitable for monitoring, protection, and temperature compensation applications in both consumer and industrial electronics.
Applications
- Digital thermometers
- Temperature monitoring systems
- Battery temperature sensing
- 3D printer hotend and heated bed monitoring
- HVAC systems
- Household appliances
- Industrial control equipment
- Temperature compensation circuits
- Arduino and ESP32 projects
- IoT environmental monitoring devices
Pinout
| Pin | Function |
|---|---|
| Lead 1 | Thermistor terminal (non-polarized) |
| Lead 2 | Thermistor terminal (non-polarized) |
Wiring
The thermistor is typically connected as one resistor in a voltage divider. One lead is connected to the supply voltage, while the other connects to an analog input and a fixed resistor (typically 10KΩ) to ground. The analog voltage changes with temperature, allowing the microcontroller to determine the measured temperature.
| Connection | Description |
|---|---|
| Lead 1 | Connect to 3.3V or 5V supply |
| Lead 2 | Connect to Analog Input (A0) and a 10KΩ resistor to GND |
| Fixed Resistor | 10KΩ resistor forming a voltage divider |
Specifications
| Product Type | NTC Thermistor |
| Model | MF5A-3 |
| Resistance @ 25°C | 10KΩ |
| Beta Value (B25/50) | 3950K |
| Resistance Tolerance | ±5% |
| Thermistor Type | Negative Temperature Coefficient (NTC) |
| Operating Temperature | -40°C to +125°C |
| Package Type | Epoxy-Coated Bead with Radial Leads |
| Lead Type | Non-Polarized |
| Applications | Temperature Measurement, Compensation, Protection, and Control |
Resources
- NTC Thermistor Theory: https://en.wikipedia.org/wiki/Thermistor
- Arduino IDE: https://www.arduino.cc/en/software
- Steinhart–Hart Equation: https://en.wikipedia.org/wiki/Steinhart%E2%80%93Hart_equation