LM235 Temperature Sensor (TO-92 Plastic Package)

The LM235 is a precision temperature sensor from Texas Instruments that outputs a voltage linearly proportional to the absolute temperature in Kelvin. It's very similar to the LM135/LM335 series, and it's commonly used for temperature measurements in both analog and digital systems.

Key Features of LM235:

• Voltage output: 10 mV/K (Kelvin)
• Temperature range: –40°C to +125°C (typical), though it can operate beyond this with derating.
• Output at 25°C:
• 10 mV/K×(273+25)=2.98 V10 \text{ mV/K} \times (273 + 25) = 2.98 \text{ V}10 mV/K×(273+25)=2.98 V
• Accuracy: ±1°C typical (after calibration), ±2°C max (without calibration)
• Calibration: Can be calibrated at a single point due to linear output
• Low impedance output: Can drive loads directly
• Low cost, easy to use

Basic Circuit Example:

To use the LM235, you typically connect:

• V+ (anode) to a positive voltage supply (5V to 30V)
• V– (cathode) to ground
• Output taken from the cathode with a resistor to ground, or measured directly

Temperature Calculation:

To convert the output voltage to Celsius:

1. Measure voltage VoutV_{out}Vout​
2. Convert voltage to temperature in Kelvin:
3. TK=Vout/0.01T_K = V_{out} / 0.01TK​=Vout​/0.01
4. Convert Kelvin to Celsius:
5. TC=TK−273.15T_C = T_K - 273.15TC​=TK​−273.15

Applications:

• Environmental monitoring
• Industrial temperature sensing
• Consumer electronics
• HVAC systems
• Microcontroller-based data logging

Origin:- China

Brand:- Generic