Overview
The LM135AH/NOPB is a precision temperature sensor integrated circuit produced by Texas Instruments. It operates as a 2-terminal zener diode with a breakdown voltage directly proportional to absolute temperature at 10 mV/°K. This device is part of the LMx35 series, known for its high accuracy and ease of calibration. The LM135AH/NOPB is particularly useful for temperature sensing applications over a wide range of temperatures, from −55°C to 150°C, making it versatile for various industrial and consumer electronics uses.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Temperature Range | −55 | 150 | °C | |
| Forward Current | 0.4 | 1 | 5 | mA |
| Dynamic Impedance | 0.5 | 0.6 | Ω | |
| Output Voltage Temperature Coefficient | 10 | mV/°C | ||
| Initial Accuracy at 25°C | ±1 | °C | ||
| Storage Temperature Range | −60 | 150 | °C | |
| Reverse Current | 15 | mA |
Key Features
- Directly Calibrated to the Kelvin Temperature Scale: The LM135AH/NOPB has a breakdown voltage directly proportional to absolute temperature at 10 mV/°K.
- High Accuracy: Typically 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, allowing for easy interfacing with readout or control circuitry.
- Easily Calibrated: A simple one-point calibration method using the ADJ pin corrects for inaccuracies over the full temperature range.
- Wide Operating Temperature Range: Operates from −55°C to 150°C.
- Low Cost: Offers a cost-effective solution for temperature sensing applications.
Applications
- Power Supplies: Used for temperature monitoring and control in power supply units.
- Battery Management: Essential for monitoring battery temperatures in various battery management systems.
- HVAC Systems: Utilized in heating, ventilation, and air conditioning systems for temperature control and monitoring.
- Appliances: Found in various household and industrial appliances where temperature sensing is critical.
Q & A
- What is the operating temperature range of the LM135AH/NOPB?
The LM135AH/NOPB operates over a temperature range of −55°C to 150°C. - What is the typical forward current for the LM135AH/NOPB?
The typical forward current is 1 mA, with a range of 0.4 mA to 5 mA. - How accurate is the LM135AH/NOPB at 25°C?
Typically, the LM135AH/NOPB has an accuracy of ±1°C at 25°C. - What is the dynamic impedance of the LM135AH/NOPB?
The dynamic impedance is less than 1 Ω, typically around 0.5 to 0.6 Ω. - How is the LM135AH/NOPB calibrated?
The device can be calibrated using a one-point calibration method via the ADJ pin. - What are the common applications of the LM135AH/NOPB?
Common applications include power supplies, battery management, HVAC systems, and various appliances. - What is the storage temperature range for the LM135AH/NOPB?
The storage temperature range is from −60°C to 150°C. - What is the output voltage temperature coefficient of the LM135AH/NOPB?
The output voltage temperature coefficient is 10 mV/°C. - How does the LM135AH/NOPB handle thermal management?
Efficient thermal management involves ensuring the device is mechanically connected to the surface being measured and keeping it away from heat sources. - What are the package options for the LM135AH/NOPB?
The LM135AH/NOPB is available in hermetic TO-46 packages.
