LM50 and LM50-Q1 SOT-23 Single-Supply Centigrade Temperature Sensor

1 Features

• LM50-Q1 is AEC-Q100 Grade 1 Qualified and is Manufactured on an Automotive Grade Flow
• Calibrated Directly in Degrees Celsius (Centigrade)
• Linear + 10 mV/°C Scale Factor
• ±2°C Accuracy Specified at 25°C
• Specified for Full –40° to 125°C Range
• Suitable for Remote Applications
• Low Cost Due to Wafer-Level Trimming
• Operates From 4.5 V to 10 V
• Less Than 130-µA Current Drain
• Low Self-Heating: Less Than 0.2°C in Still A
• Nonlinearity Less Than 0.8°C Over Temp
• UL Recognized Component

2 Applications

• Automotive
• Computers
• Disk Drives
• Battery Management
• FAX Machines
• Printers
• Portable Medical Instruments
• HVAC
• Power Supply Modules

SPACER

3 Description

The LM50 and LM50-Q1 devices are precision integrated-circuit temperature sensors that can sense a –40°C to 125°C temperature range using a single positive supply. The output voltage of the device is linearly proportional to temperature (10 mV/°C) and has a DC offset of 500 mV. The offset allows reading negative temperatures without the need for a negative supply.

The ideal output voltage of the LM50 or LM50-Q1 ranges from 100 mV to 1.75 V for a –40°C to 125°C temperature range. The LM50 and LM50-Q1 do not require any external calibration or trimming to provide accuracies of ±3°C at room temperature and ±4°C over the full –40°C to 125°C temperature range. Trimming and calibration of the LM50 and LM50-Q1 at the wafer level assure low cost and high accuracy. The linear output, 500 mV offset, and factory calibration of the LM50 and LM50-Q1 simplify the circuitry requirements in a single supply environment where reading negative temperatures is necessary. Because the quiescent current of the LM50 and LM50-Q1 is less than 130 µA, self-heating is limited to a very low 0.2°C in still air.

1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Schematic

Full-Range Centigrade Temperature Sensor (–40°C to 125°C)

4 Revision History

Changes from F Revision (December 2016) to G Revision

• Changed LMT90 to LM50 in V_O description of Equation 1 Go

Changes from E Revision (September 2013) to F Revision

• Added Device Information table, Pin Configuration and Functions section, ESD Ratings table, Detailed Description section, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information sectionGo
• Added Thermal Information tableGo
• Changed Junction-to-ambient, R_θJA, value in Thermal Information table From: 450°C/W To: 291.9°C/WGo
• Deleted the Temperature To Digital Converter (Parallel TRI-STATE Outputs for Standard Data Bus to µP Interface) (125°C Full Scale) figureGo

Changes from C Revision (February 2013) to E Revision

• Added LM50-Q1 option throughout documentGo

5 Pin Configuration and Functions

DBZ Package

3-Pin SOT-23

Top View