Features Directly calibrated in °Kelvin 1°C initial accuracy available Operates from 400 μA to 5 mA Less than 1Ω dynamic impedance Easily calibrated Wide operating temperature range 200°C overrange Low cost Description The LM135 series are precision, easily-calibrated, integrated circuit temperature sensors. Operating as a 2-terminal zener, the LM135 has a breakdown voltage directly proportional to absolute temperature at +10 mV/°K. With less than 1Ω dynamic impedance the device operates over a current range of 400 μA to 5 mA with virtually no change in performance. When calibrated at 25°C the LM135 has typically less than 1°C error over a 100°C temperature range. Unlike other sensors the LM135 has a linear output. Applications for the LM135 include almost any type of temperature sensing over a −55°C to 150°C temperature range. The low impedance and linear output make interfacing to readout or control circuitry especially easy. The LM135 operates over a −55°C to 150°C temperature range while the LM235 operates over a −40°C to 125°C temperature range. The LM335 operates from −40°C to 100°C. The LM135/LM235/LM335 are available packaged in hermetic TO-46 transistor packages while the LM335 is also available in plastic TO-92 packages.

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

Datasheets

Title		Size	Date	Other Language
	LM235 Precision Temperature Sensor	857 Kbytes	17-Dec-08

Application Notes

Title		Size	Date	Other Language
	AN-225: Application Note 225 IC Temperature Sensor Provides Thermocouple Cold-Junction Compensation	89 Kbytes	2-Oct-02

Other Technical Documents

Title		Type	Date
	Temperature Sensors Handbook	App Note	2003-03-13

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM235H/NOPB LM235H RoHS Status	TO-46	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 1199 AVNET-EM Worldwide 204 DIGI-KEY Worldwide 72 TAYLOR Americas 1199	$4.70 each at 1K+ pcs	box of 1000

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 LM235.

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 LM235 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
LM235H/NOPB LM235H	279.309 279.699	TO-46	3	1 1	NA NA	Detail	N/A	N/A	NSXYTTE# LM235H

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 LM235.

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 LM235 is located at RoHS Status.

CAD Symbols and Models N/A

Models N/A