Overview
The LM50CIM3X is a precision integrated-circuit temperature sensor produced by National Semiconductor, now part of Texas Instruments. This device is designed to sense temperatures in the range of –40°C to 125°C using a single positive supply. It features a linear output voltage that is directly proportional to the temperature, with a scale factor of 10 mV/°C and a DC offset of 500 mV, allowing for the reading of negative temperatures without a negative supply.
The LM50CIM3X is packaged in a SOT-23-3 package, making it suitable for a variety of applications where space is limited. The device operates from a supply voltage of 4.5 V to 10 V and has a low quiescent current of less than 130 µA, which minimizes self-heating to less than 0.2°C in still air.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| Supply Voltage | 4.5 | 10 | V |
| Operating Temperature | –40 | 125 | °C |
| Storage Temperature | –65 | 150 | °C |
| Output Voltage Range | 100 mV | 1.75 V | V |
| Scale Factor | 10 mV/°C | mV/°C | |
| DC Offset | 500 mV | mV | |
| Accuracy at 25°C | ±2°C | °C | |
| Accuracy over –40°C to 125°C | ±4°C | °C | |
| Quiescent Current | 130 µA | µA | |
| Self-Heating | 0.2°C | °C | |
| Package Type | SOT-23-3 |
Key Features
- Calibrated directly in degrees Celsius (centigrade) with a linear +10 mV/°C scale factor.
- Specified for full –40°C to 125°C temperature range.
- Low cost due to wafer-level trimming.
- Operates from 4.5 V to 10 V supply voltage.
- Low quiescent current of less than 130 µA.
- Low self-heating of less than 0.2°C in still air.
- Nonlinearity less than 0.8°C over the temperature range.
- UL recognized component.
- AEC-Q100 Grade 1 qualified for automotive applications (LM50-Q1 variant).
Applications
- Automotive systems.
- Computers and computer peripherals.
- Disk drives.
- Battery management systems.
- FAX machines and printers.
- Portable medical instruments.
- HVAC (Heating, Ventilation, and Air Conditioning) systems.
- Power supply modules.
Q & A
- What is the temperature range of the LM50CIM3X?
The LM50CIM3X can sense temperatures in the range of –40°C to 125°C.
- What is the scale factor of the LM50CIM3X?
The scale factor is 10 mV/°C.
- What is the DC offset of the LM50CIM3X?
The DC offset is 500 mV.
- What is the accuracy of the LM50CIM3X at 25°C?
The accuracy at 25°C is ±2°C.
- What is the quiescent current of the LM50CIM3X?
The quiescent current is less than 130 µA.
- What is the self-heating of the LM50CIM3X in still air?
The self-heating is less than 0.2°C in still air.
- What package type is the LM50CIM3X available in?
The LM50CIM3X is available in a SOT-23-3 package.
- Is the LM50CIM3X suitable for automotive applications?
- What is the recommended operating supply voltage for the LM50CIM3X?
The recommended operating supply voltage is from 4.5 V to 10 V.
- Does the LM50CIM3X require external calibration or trimming?
No, the LM50CIM3X does not require any external calibration or trimming due to wafer-level trimming.
