NSC LM35DM, LM35CZ, LM35CAZ, LM35H, LM35DZ Datasheet

July 1999

LM35

Precision Centigrade Temperature Sensors

General Description

The LM35 series are precision integrated-circuit temperature sensors, whose output voltage is linearly proportional to the Celsius (Centigrade) temperature. The LM35 thus has an advantage over linear temperature sensors calibrated in Ê Kelvin, as the user is not required to subtract a large constant voltage from its output to obtain convenient Centigrade scaling. The LM35 does not require any external calibration or trimming to provide typical accuracies of ±1¤4ÊC at room temperature and ±3¤4ÊC over a full −55 to +150ÊC temperature range. Low cost is assured by trimming and calibration at the wafer level. The LM35's low output impedance, linear output, and precise inherent calibration make interfacing to readout or control circuitry especially easy. It can be used with single power supplies, or with plus and minus supplies. As it draws only 60 µA from its supply, it has very low self-heating, less than 0.1ÊC in still air. The LM35 is rated to operate over a −55Ê to +150ÊC temperature range, while the LM35C is rated for a −40Ê to +110ÊC range (−10Ê with improved accuracy). The LM35 series is available packaged in

hermetic TO-46 transistor packages, while the LM35C, LM35CA, and LM35D are also available in the plastic TO-92 transistor package. The LM35D is also available in an 8-lead surface mount small outline package and a plastic TO-220 package.

Features

nCalibrated directly in Ê Celsius (Centigrade)

nLinear + 10.0 mV/ÊC scale factor

n0.5ÊC accuracy guaranteeable (at +25ÊC)

nRated for full −55Ê to +150ÊC range

nSuitable for remote applications

nLow cost due to wafer-level trimming

nOperates from 4 to 30 volts

nLess than 60 µA current drain

nLow self-heating, 0.08ÊC in still air

nNonlinearity only ±1¤4ÊC typical

nLow impedance output, 0.1 Ω for 1 mA load

Typical Applications

		DS005516-4
	DS005516-3	Choose R1 = −V S/50 µA
	FIGURE 1. Basic Centigrade Temperature Sensor	V OUT=+1,500 mV at +150ÊC
	(+2ÊC to +150ÊC)	= +250 mV at +25ÊC
		= −550 mV at −55ÊC
		FIGURE 2. Full-Range Centigrade Temperature Sensor

TRI-STATE® is a registered trademark of National Semiconductor Corporation.

Sensors Temperature Centigrade Precision LM35

© 1999 National Semiconductor Corporation

DS005516

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Connection Diagrams

TO-46

Metal Can Package*

DS005516-1

*Case is connected to negative pin (GND)

Order Number LM35H, LM35AH, LM35CH, LM35CAH or LM35DH

See NS Package Number H03H

TO-92

Plastic Package

DS005516-2

Order Number LM35CZ,

LM35CAZ or LM35DZ

See NS Package Number Z03A

SO-8

Small Outline Molded Package

DS005516-21

N.C. = No Connection

Top View

Order Number LM35DM

See NS Package Number M08A

TO-220

Plastic Package*

DS005516-24

*Tab is connected to the negative pin (GND).

Note: The LM35DT pinout is different than the discontinued LM35DP.

Order Number LM35DT

See NS Package Number TA03F

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Absolute Maximum Ratings (Note 10)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Supply Voltage	+35V to −0.2V
Output Voltage	+6V to −1.0V
Output Current	10 mA
Storage Temp.;
TO-46 Package,	−60ÊC to +180ÊC
TO-92 Package,	−60ÊC to +150ÊC
SO-8 Package,	−65ÊC to +150ÊC
TO-220 Package,	−65ÊC to +150ÊC
Lead Temp.:
TO-46 Package,
(Soldering, 10 seconds)	300ÊC

TO-92 and TO-220 Package,
(Soldering, 10 seconds)	260ÊC
SO Package (Note 12)
Vapor Phase (60 seconds)	215ÊC
Infrared (15 seconds)	220ÊC
ESD Susceptibility (Note 11)	2500V

Specified Operating Temperature Range: TMIN to T MAX (Note 2)

LM35, LM35A	−55ÊC to +150ÊC
LM35C, LM35CA	−40ÊC to +110ÊC
LM35D	0ÊC to +100ÊC

Electrical Characteristics

(Notes 1, 6)

			LM35A			LM35CA
Parameter	Conditions		Tested	Design		Tested	Design	Units
		Typical	Limit	Limit	Typical	Limit	Limit	(Max.)
			(Note 4)	(Note 5)		(Note 4)	(Note 5)
Accuracy	T A=+25ÊC	±0.2	±0.5		±0.2	±0.5		ÊC
(Note 7)	T A=−10ÊC	±0.3			±0.3		±1.0	ÊC
	T A=TMAX	±0.4	±1.0		±0.4	±1.0		ÊC
	T A=TMIN	±0.4	±1.0		±0.4		±1.5	ÊC
Nonlinearity	T MIN≤TA≤TMAX	± 0.18		± 0.35	± 0.15		± 0.3	ÊC
(Note 8)
Sensor Gain	T MIN≤TA≤TMAX	+10.0	+9.9,		+10.0		+9.9,	mV/ÊC
(Average Slope)			+10.1				+10.1
Load Regulation	T A=+25ÊC	±0.4	±1.0		±0.4	±1.0		mV/mA
(Note 3) 0≤IL≤1 mA	T MIN≤TA≤TMAX	± 0.5		± 3.0	± 0.5		± 3.0	mV/mA
Line Regulation	T A=+25ÊC	±0.01	±0.05		±0.01	±0.05		mV/V
(Note 3)	4V≤V S≤30V	± 0.02		± 0.1	± 0.02		± 0.1	mV/V
Quiescent Current	V S=+5V, +25ÊC	56	67		56	67		µA
(Note 9)	V S=+5V	105		131	91		114	µA
	V S=+30V, +25ÊC	56.2	68		56.2	68		µA
	V S=+30V	105.5		133	91.5		116	µA
Change of	4V≤VS≤30V, +25ÊC	0.2	1.0		0.2	1.0		µA
Quiescent Current	4V≤V S≤30V	0.5		2.0	0.5		2.0	µA
(Note 3)
Temperature		+0.39		+0.5	+0.39		+0.5	µA/ÊC
Coefficient of
Quiescent Current
Minimum Temperature	In circuit of	+1.5		+2.0	+1.5		+2.0	ÊC
for Rated Accuracy	Figure 1, IL=0
Long Term Stability	T J=TMAX, for	±0.08			±0.08			ÊC
	1000 hours

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Electrical Characteristics

(Notes 1, 6)

			LM35			LM35C, LM35D
Parameter	Conditions		Tested	Design			Tested		Design	Units
		Typical	Limit	Limit	Typical		Limit		Limit	(Max.)
			(Note 4)	(Note 5)			(Note 4)		(Note 5)
Accuracy,	T A=+25ÊC	±0.4	±1.0		±0.4		±1.0			ÊC
LM35, LM35C	T A=−10ÊC	±0.5			±0.5				±1.5	ÊC
(Note 7)	T A=TMAX	±0.8	±1.5		±0.8				±1.5	ÊC
	T A=TMIN	±0.8		±1.5	±0.8				±2.0	ÊC
Accuracy, LM35D	T A=+25ÊC				±0.6		±1.5			ÊC
(Note 7)	TA=TMAX				±0.9				±2.0	ÊC
	TA=TMIN				±0.9				±2.0	ÊC
Nonlinearity	T MIN≤TA≤TMAX	± 0.3		± 0.5	± 0.2				± 0.5	ÊC
(Note 8)
Sensor Gain	T MIN≤TA≤TMAX	+10.0	+9.8,		+10.0				+9.8,	mV/ÊC
(Average Slope)			+10.2						+10.2
Load Regulation	T A=+25ÊC	±0.4	±2.0		±0.4		±2.0			mV/mA
(Note 3) 0≤IL≤1 mA	T MIN≤TA≤TMAX	± 0.5		± 5.0	± 0.5				± 5.0	mV/mA
Line Regulation	T A=+25ÊC	±0.01	±0.1		±0.01		±0.1			mV/V
(Note 3)	4V≤V S≤30V	± 0.02		± 0.2	± 0.02				± 0.2	mV/V
Quiescent Current	V S=+5V, +25ÊC	56	80		56		80			µA
(Note 9)	V S=+5V	105		158	91				138	µA
	V S=+30V, +25ÊC	56.2	82		56.2		82			µA
	V S=+30V	105.5		161	91.5				141	µA
Change of	4V≤VS≤30V, +25ÊC	0.2	2.0		0.2		2.0			µA
Quiescent Current	4V≤V S≤30V	0.5		3.0	0.5				3.0	µA
(Note 3)
Temperature		+0.39		+0.7	+0.39				+0.7	µA/ÊC
Coefficient of
Quiescent Current
Minimum Temperature	In circuit of	+1.5		+2.0	+1.5				+2.0	ÊC
for Rated Accuracy	Figure 1, IL=0
Long Term Stability	T J=TMAX, for	±0.08			±0.08					ÊC
	1000 hours

Note 1: Unless otherwise noted, these specifications apply: −55ÊC ≤TJ≤+150ÊC for the LM35 and LM35A; −40Ê ≤TJ≤+110ÊC for the LM35C and LM35CA; and

0Ê≤TJ≤+100ÊC for the LM35D. VS=+5Vdc and ILOAD=50 µA, in the circuit of Figure 2. These specifications also apply from +2ÊC to TMAX in the circuit of Figure 1. Specifications in boldface apply over the full rated temperature range.

Note 2: Thermal resistance of the TO-46 package is 400ÊC/W, junction to ambient, and 24ÊC/W junction to case. Thermal resistance of the TO-92 package is 180ÊC/W junction to ambient. Thermal resistance of the small outline molded package is 220ÊC/W junction to ambient. Thermal resistance of the TO-220 package is 90ÊC/W junction to ambient. For additional thermal resistance information see table in the Applications section.

Note 3: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output due to heating effects can be computed by multiplying the internal dissipation by the thermal resistance.

Note 4: Tested Limits are guaranteed and 100% tested in production.

Note 5: Design Limits are guaranteed (but not 100% production tested) over the indicated temperature and supply voltage ranges. These limits are not used to calculate outgoing quality levels.

Note 6: Specifications in boldface apply over the full rated temperature range.

Note 7: Accuracy is defined as the error between the output voltage and 10mv/ÊC times the device's case temperature, at specified conditions of voltage, current, and temperature (expressed in ÊC).

Note 8: Nonlinearity is defined as the deviation of the output-voltage-versus-temperature curve from the best-fit straight line, over the device's rated temperature range.

Note 9: Quiescent current is defined in the circuit of Figure 1.

Note 10: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating the device beyond its rated operating conditions. See Note 1.

Note 11: Human body model, 100 pF discharged through a 1.5 kΩ resistor.

Note 12: See AN-450 ªSurface Mounting Methods and Their Effect on Product Reliabilityº or the section titled ªSurface Mountº found in a current National Semiconductor Linear Data Book for other methods of soldering surface mount devices.

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