Overview
The LM235DT from STMicroelectronics is a precision temperature sensor that operates as a 2-terminal Zener diode. It is part of the LM135, LM235, and LM335 family, known for their high accuracy and ease of calibration. The breakdown voltage of the LM235DT is directly proportional to the absolute temperature, with a slope of 10mV/°K. This sensor is calibrated at +25°C and has a typical error of less than 1°C over a 100°C temperature range, making it highly reliable for various temperature sensing applications.
Key Specifications
| Parameter | Unit | Min. | Typ. | Max. |
|---|---|---|---|---|
| Operating Temperature Range | °C | -40 | 125 | |
| Operating Current Range | µA | 450 | 5000 | |
| Dynamic Impedance | Ω | < 1 | ||
| Initial Accuracy | °C | < 1 | ||
| Output Voltage Temperature Drift | mV/°C | 10 | ||
| Package | SO-8 | |||
| RoHS Compliance Grade | Ecopack3 |
Key Features
- Directly calibrated in °K, with a slope of 10mV/°K.
- Operates from 450µA to 5mA without alteration of its characteristics.
- High initial accuracy of less than 1°C.
- Low dynamic impedance of less than 1Ω.
- Linear output, making it easy to interpret temperature readings.
- Available in SO-8 and TO-92 packages, with Ecopack3 compliance for environmental requirements.
Applications
- Industrial temperature sensing: The LM235DT is suitable for various industrial applications where precise temperature monitoring is required.
- Temperature controllers: It can be used in simple temperature controllers and more complex control systems.
- Centigrade thermometers: The sensor can be calibrated to display temperature in centigrade scale.
- Differential temperature sensing: It can be used to measure temperature differences between two points.
- Thermocouple cold junction compensation: The LM235DT can be used to compensate for the cold junction in thermocouple measurements).
Q & A
- What is the operating temperature range of the LM235DT? The LM235DT operates from -40°C to +125°C.
- What is the current range for the LM235DT? The LM235DT operates within a current range of 450µA to 5mA).
- What is the dynamic impedance of the LM235DT? The dynamic impedance is less than 1Ω).
- How accurate is the LM235DT? The LM235DT has an initial accuracy of less than 1°C).
- What packages are available for the LM235DT? The LM235DT is available in SO-8 and TO-92 packages).
- Is the LM235DT RoHS compliant? Yes, the LM235DT is RoHS compliant with an Ecopack3 grade).
- How does the LM235DT output temperature readings? The output voltage is directly proportional to the absolute temperature at 10mV/°K).
- Can the LM235DT be calibrated for higher accuracy? Yes, the LM235DT can be easily calibrated for higher accuracies using a single-point calibration method).
- What are some common applications of the LM235DT? Common applications include industrial temperature sensing, temperature controllers, centigrade thermometers, differential temperature sensing, and thermocouple cold junction compensation).
- How does self-heating affect the LM235DT? Self-heating can decrease accuracy, but this can be mitigated by operating the sensor with a low current and ensuring constant thermal resistance).
