Overview
The LM335AD, produced by STMicroelectronics, is a precision temperature sensor that operates as a 2-terminal Zener diode. The breakdown voltage of the LM335AD is directly proportional to the absolute temperature, with a linear output of 10mV/°K. This sensor is calibrated at +25°C and offers high accuracy, with a typical error of less than 1°C over a 100°C temperature range. It is designed to operate within a current range of 450µA to 5mA, ensuring consistent performance without significant changes in its characteristics.
Key Specifications
| Parameter | Unit | Min. | Typ. | Max. |
|---|---|---|---|---|
| Operating Current | mA | 0.45 | 1 | 5 |
| Operating Temperature Range | °C | -40 | - | 100 |
| Storage Temperature Range | °C | -65 | - | 150 |
| Initial Accuracy at +25°C | °C | - | 1 | - |
| Dynamic Impedance | Ω | - | < 1 | - |
| Output Voltage Temperature Drift | mV/°C | - | 10 | - |
| Package Types | - | - | TO-92, SO-8 | - |
Key Features
- Directly Calibrated in °K: The LM335AD is calibrated to provide a direct reading of absolute temperature in Kelvin.
- High Accuracy: Offers an initial accuracy of less than 1°C at +25°C and over a 100°C temperature range.
- Low Dynamic Impedance: Less than 1Ω, ensuring minimal impact on the circuit.
- Linear Output: Provides a linear output voltage proportional to the absolute temperature.
- Wide Operating Current Range: Operates from 450µA to 5mA without significant changes in its characteristics.
- Environmental Compliance: Available in ECOPACK® packages, which are lead-free and comply with RoHS standards.
Applications
- Industrial Temperature Monitoring: Suitable for monitoring temperatures in industrial environments.
- Temperature Controllers: Can be used in simple temperature controllers and thermostats.
- Centigrade Thermometers: Ideal for building centigrade thermometers due to its linear output.
- Differential Temperature Sensing: Can be used to measure temperature differences between two points.
- Thermocouple Cold Junction Compensation: Useful for compensating the cold junction in thermocouple measurements.
Q & A
- What is the operating temperature range of the LM335AD?
The LM335AD operates from -40°C to 100°C.
- What is the typical initial accuracy of the LM335AD at +25°C?
The typical initial accuracy is less than 1°C.
- What is the dynamic impedance of the LM335AD?
The dynamic impedance is less than 1Ω.
- How does the LM335AD output voltage relate to temperature?
The output voltage is directly proportional to the absolute temperature at 10mV/°K.
- What are the available package types for the LM335AD?
The LM335AD is available in TO-92 and SO-8 packages.
- Is the LM335AD RoHS compliant?
- What is the operating current range of the LM335AD?
The operating current range is from 450µA to 5mA.
- Can the LM335AD be used for differential temperature sensing?
- How does the LM335AD handle self-heating?
- What are some common applications of the LM335AD?
Common applications include industrial temperature monitoring, temperature controllers, centigrade thermometers, and thermocouple cold junction compensation.
