Features Calibrated directly in degree Celsius (Centigrade) Linear + 10.0 mV/°C scale factor ±2°C accuracy guaranteed at +25°C Specified for full -40° to +125°C range Suitable for remote applications Low cost due to wafer-level trimming Operates from 4.5V to 10V Less than 130 µA current drain Low self-heating, less than 0.2°C in still air Nonlinearity less than 0.8°C over temp UL Recognized Component Description The LM50 is a precision integrated-circuit temperature sensor that can sense a -40°C to +125°C temperature range using a single positive supply. The LM50's output voltage is linearly proportional to Celsius (Centigrade) 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 ranges from +100 mV to +1.75V for a -40°C to +125°C temperature range. The LM50 does 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 at the wafer level assure low cost and high accuracy. The LM50's linear output, +500 mV offset, and factory calibration simplify circuitry required in a single supply environment where reading negative temperatures is required. Because the LM50's quiescent current is less than 130 µA, self-heating is limited to a very low 0.2°C in still air. Applications Computers Disk Drives Battery Management Automotive FAX Machines Printers Portable Medical Instruments HVAC Power Supply Modules

Typical Application click for larger image	Connection Diagram *click for larger image
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LM50 SOT-23 Single-Supply Centigrade Temperature Sensor	605 Kbytes	10-Feb-06	日本語

Other Technical Documents

Title		Type	Date
	Temperature Sensors Handbook	App Note	2003-03-13
	Sensing and Monitoring for Control and Protection Seminar	App Note	2003-02-17
	Tiny Temperature Sensors for Remote Systems	App Note	2003-02-17

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM50BIM3/NOPB LM50BIM3 RoHS Status	SOT-23	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 1502 AVNET-EM Worldwide 16000 DIGI-KEY Worldwide 5681 FARNELL Europe and Asia 3697 MOUSER Worldwide 883 NEWARK Americas 746 RS COMPONENTS Worldwide 410 TAYLOR Americas 16778	$0.59 each at 1K+ pcs	reel of 1000
LM50BIM3X/NOPB LM50BIM3X RoHS Status	SOT-23	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 3000 DIGI-KEY Worldwide 0 MOUSER Worldwide 2880 TAYLOR Americas 3000	$0.59 each at 1K+ pcs	reel of 3000
LM50CIM3/NOPB LM50CIM3 RoHS Status	SOT-23	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 5630 AVNET-EM Worldwide 4026 CEAC Asia Pacific 7000 DIGI-KEY Worldwide 14289 FARNELL Europe and Asia 6283 MOUSER Worldwide 4087 NEWARK Americas 1840 RS COMPONENTS Worldwide 420 TAYLOR Americas 20247 TECHMOSA Asia Pacific 2000	$0.32 each at 1K+ pcs	reel of 1000
LM50CIM3X/NOPB LM50CIM3X RoHS Status	SOT-23	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 11300 DIGI-KEY Worldwide 0 FARNELL Europe and Asia 2830 MOUSER Worldwide 2785 NEWARK Americas 2830 RSL MICRO Asia Pacific 45000 TAYLOR Americas 15087	$0.32 each at 1K+ pcs	reel of 3000

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM50B MDC	NONE	NATIONAL SEMICONDUCTOR	03 Dec 2008
LM50C MDC	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM50.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM50 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM50BIM3/NOPB LM50BIM3	10.34 10.399	SOT-23	3	1 1	260 260	Detail	Download	N/A	T5B XTT
LM50BIM3X/NOPB LM50BIM3X	10.34 10.399	SOT-23	3	1 1	260 260	Detail	Download	N/A	T5B XTT
LM50CIM3/NOPB LM50CIM3	10.34 10.399	SOT-23	3	1 1	260 260	Detail	Download	N/A	T5C XTT
LM50CIM3X/NOPB LM50CIM3X	10.34 10.399	SOT-23	3	1 1	260 260	Detail	Download	N/A	T5C XTT

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM50.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM50 is located at RoHS Status.

CAD Symbols and Models Download LM50 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM50BIM3	LFAST1	0	20140	0	0	2785000	2	790251354
LM50BIM3X	LFAST1	0	20140	0	0	2785000	2	790251354
LM50CIM3	LFAST1	0	20140	0	0	2785000	2	790251354
LM50CIM3X	LFAST1	0	20140	0	0	2785000	2	790251354

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM50.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM50 is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM50B MDC	NONE	NATIONAL SEMICONDUCTOR	03 Dec 2008
LM50C MDC	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009