100K Ohm NTC 3950 Thermistor

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Component Name

Description

The 100K Ohm NTC 3950 Thermistor is a thermally sensitive resistor whose resistance decreases as the temperature increases. It is a Negative Temperature Coefficient (NTC) thermistor, meaning its resistance exhibits a negative correlation with temperature. This component is commonly used in various applications, including temperature measurement, temperature control, and temperature compensation in electronic circuits.

Functionality

The primary function of the 100K Ohm NTC 3950 Thermistor is to convert temperature changes into corresponding changes in electrical resistance. When the thermistor is exposed to changes in temperature, its internal material properties alter, resulting in a variation in its resistance. This resistance change can be measured and converted into a temperature reading using an external circuit or microcontroller.

Key Features

Nominal Resistance: 100K Ohm at 25C (room temperature)
Temperature Range: -50C to 150C (-58F to 302F)
NTC Type: 3950, indicating a negative temperature coefficient
Accuracy: Typical tolerance of 1% or 3%
Stability: Long-term stability, with minimal drift over time
Response Time: Typically around 10-30 seconds, depending on the surroundings
Power Rating: Low power consumption, typically in the range of 10-100 mW
Package Type: Typically surface-mount device (SMD) or through-hole (TH) package
Operating Voltage: Up to 100Vdc, although typically used with lower voltages (e.g., 5V or 3.3V)
Insulation Resistance: Typically in the range of 100M to 1G

Applications

The 100K Ohm NTC 3950 Thermistor is commonly used in various applications, including

Temperature measurement and control systems

Thermal protection circuits

Medical devices

Industrial automation

HVAC systems

Automotive systems

Consumer electronics

Internet of Things (IoT) devices

Important Notes

When handling thermistors, it is essential to avoid mechanical stress, excessive temperature changes, and moisture exposure to ensure reliable performance and longevity.

Thermistors are sensitive to thermal shock and may exhibit hysteresis, which can affect accuracy in certain applications.

Calibration and linearization may be necessary to achieve high accuracy temperature measurements.

By understanding the characteristics and features of the 100K Ohm NTC 3950 Thermistor, designers and engineers can effectively integrate this component into their projects and applications, ensuring reliable and accurate temperature measurement and control.

Pin Configuration

100K Ohm NTC 3950 Thermistor Documentation
Pin Description:
The 100K Ohm NTC 3950 Thermistor has 2 pins, which are used to measure the temperature. Here is a detailed description of each pin:
Pin 1:
Function: Negative leg of the thermistor
Description: This pin is connected to the negative side of the power supply or ground.
Color Code: Typically, this pin is marked with a black or brown wire.
Pin 2:
Function: Positive leg of the thermistor
Description: This pin is connected to the positive side of the power supply or a pull-up resistor.
Color Code: Typically, this pin is marked with a white or red wire.
Connection Structure:
To connect the 100K Ohm NTC 3950 Thermistor, follow these steps:
Step 1:
Connect Pin 1 (Negative leg) to the ground (GND) or a negative power supply.
Step 2:
Connect Pin 2 (Positive leg) to a pull-up resistor (typically 4.7K Ohm) and then to a digital or analog input pin of a microcontroller (e.g., Arduino, Raspberry Pi, etc.).
Example Connection Diagram:
Here is a sample connection diagram for the 100K Ohm NTC 3950 Thermistor:
```
Pin 1 (Negative leg) -> GND
Pin 2 (Positive leg) -> 4.7K Ohm Pull-up Resistor -> VCC
|
|
v
Microcontroller (e.g., Arduino)
|
|
v
Digital/Analog Input Pin
```
Important Notes:
Make sure to use a pull-up resistor to connect the thermistor to the microcontroller, as this provides a stable voltage reference for the thermistor.
The thermistor should be connected to a stable power supply to ensure accurate temperature readings.
The thermistor's temperature measurement range is typically between -40C to 125C. Operating outside this range may affect the thermistor's accuracy or damage the component.
By following these connection guidelines, you can accurately measure temperature using the 100K Ohm NTC 3950 Thermistor in your IoT project.

Code Examples

Component Documentation: 100K Ohm NTC 3950 Thermistor

Overview

The 100K Ohm NTC 3950 Thermistor is a negative temperature coefficient (NTC) thermistor, a type of temperature-sensing component. It exhibits a decrease in resistance as the temperature increases, making it an ideal device for measuring temperature in a wide range of applications. This thermistor has a nominal resistance of 100k at 25C and follows the NTC 3950 curve, a common standard for thermistors.

Characteristics

Nominal Resistance: 100k at 25C
 Temperature Range: -40C to 125C
 Accuracy: 1C
 Thermistor Curve: NTC 3950
 Operating Voltage: up to 100mV
 Power Rating: up to 50mW

Code Examples

### Example 1: Basic Temperature Measurement with Arduino

In this example, we will connect the 100K Ohm NTC 3950 Thermistor to an Arduino board and read the temperature using the analog-to-digital converter (ADC).

Hardware Requirements:

Arduino Board (e.g., Arduino Uno)
 100K Ohm NTC 3950 Thermistor
 Breadboard and jumper wires
 10k resistor (for voltage divider)

Software Requirements:

Arduino IDE (version 1.8.x or higher)

Code:
```c++
const int thermistorPin = A0;  // Analog input pin
const int R1 = 10000;       // 10k resistor for voltage divider
const float VCC = 5.0;      // Supply voltage

void setup() {
  Serial.begin(9600);
}

void loop() {
  int reading = analogRead(thermistorPin);
  float Vout = reading  VCC / 1023.0;
  float R2 = R1  (VCC / Vout - 1.0);
  float temperature = thermistorTemperature(R2);
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" C");
  delay(1000);
}

float thermistorTemperature(float R2) {
  // Calculate temperature using the Steinhart-Hart equation
  float A = 0.001129245;
  float B = 0.000234755;
  float C = 0.000000085665;
  float temperature = A + B  log(R2) + C  pow(log(R2), 3);
  return temperature;
}
```
### Example 2: Temperature Monitoring with Raspberry Pi using Python

In this example, we will connect the 100K Ohm NTC 3950 Thermistor to a Raspberry Pi and read the temperature using Python.

Hardware Requirements:

Raspberry Pi (any model)
 100K Ohm NTC 3950 Thermistor
 Breadboard and jumper wires
 10k resistor (for voltage divider)

Software Requirements:

Raspbian OS (any version)
 Python 3.x (installed with Raspbian)

Code:
```python
import RPi.GPIO as GPIO
import time

# Set up GPIO library
GPIO.setmode(GPIO.BCM)

# Define thermistor pin and resistor value
thermistor_pin = 17
R1 = 10000

# Set up ADC
GPIO.setup(thermistor_pin, GPIO.IN)

while True:
    # Read analog value
    reading = GPIO.input(thermistor_pin)

# Convert to voltage
    Vout = reading  3.3 / 1023.0

# Calculate R2
    R2 = R1  (3.3 / Vout - 1.0)

# Calculate temperature using Steinhart-Hart equation
    A = 0.001129245
    B = 0.000234755
    C = 0.000000085665
    temperature = A + B  math.log(R2) + C  math.pow(math.log(R2), 3)

print("Temperature: {:.2f} C".format(temperature))
    time.sleep(1)
```
Note: These examples are for illustration purposes only and may require modifications to suit specific use cases. Always ensure proper electrical connections and follow safety guidelines when working with electronic components.