Overview
The LM335AM, produced by Texas Instruments, is a precision integrated circuit temperature sensor. It operates as a 2-terminal zener diode with a breakdown voltage directly proportional to absolute temperature at 10 mV/°K. This sensor is known for its ease of calibration and linear output, making it suitable for a wide range of temperature sensing applications. The LM335AM is available in various packages, including plastic SOIC (D) and TO-92 packages, and operates over a temperature range of -40°C to 100°C.
Key Specifications
| Parameter | Unit | Min. | Max. | |
|---|---|---|---|---|
| Operating Temperature Range | °C | -40 | 100 | |
| Operating Current Range | mA | 0.4 | 1 | 5 |
| Dynamic Impedance | Ω | 0.5 | 0.6 | |
| Output Voltage at 25°C, IR = 1 mA | V | 2.95 | 2.98 | 3.01 |
| Uncalibrated Temperature Error at 25°C, IR = 1 mA | °C | 1 | 3 | 6 |
| Temperature Error with 25°C Calibration | °C | 0.5 | 1 | 2 |
| Output Voltage Temperature Coefficient | mV/°C | 10 | ||
| Time Constant in Still Air | s | 80 |
Key Features
- Directly Calibrated to the Kelvin Temperature Scale: The LM335AM is calibrated to the Kelvin temperature scale, providing accurate temperature readings.
- High Accuracy: Offers 1°C initial accuracy and less than 1°C error over a 100°C temperature range when calibrated at 25°C.
- Low Dynamic Impedance: Less than 1-Ω dynamic impedance ensures easy interfacing with readout or control circuitry.
- Wide Operating Temperature Range: Operates from -40°C to 100°C.
- Easily Calibrated: Simple one-point calibration method using an adjustment pin.
- Linear Output: Unlike other sensors, the LM335AM has a linear output, making it easier to interface with other circuits.
- Low Cost: An economical solution for temperature sensing applications.
Applications
- Power Supplies: Used in power supply units for temperature monitoring.
- Battery Management: Employed in battery management systems to monitor temperature.
- HVAC Systems: Utilized in heating, ventilation, and air conditioning systems for temperature control.
- Appliances: Integrated into various household and industrial appliances for temperature sensing.
Q & A
- What is the operating temperature range of the LM335AM? The LM335AM operates from -40°C to 100°C.
- What is the dynamic impedance of the LM335AM? The dynamic impedance is less than 1 Ω.
- How accurate is the LM335AM? The LM335AM offers 1°C initial accuracy and less than 1°C error over a 100°C temperature range when calibrated at 25°C.
- What is the output voltage temperature coefficient of the LM335AM? The output voltage temperature coefficient is 10 mV/°C.
- How is the LM335AM calibrated? The LM335AM can be calibrated using a simple one-point calibration method with an adjustment pin.
- What are the typical applications of the LM335AM? The LM335AM is used in power supplies, battery management systems, HVAC systems, and various appliances.
- What is the operating current range of the LM335AM? The operating current range is from 400 μA to 5 mA.
- What is the time constant of the LM335AM in still air? The time constant in still air is approximately 80 seconds.
- Is the LM335AM available in different packages? Yes, it is available in plastic SOIC (D) and TO-92 packages.
- What is the significance of the linear output of the LM335AM? The linear output makes it easier to interface with readout or control circuitry.
