LM35 Precision Centigrade Temperature Sensors
- SNIS159H August 1999 – December 2017 LM35
  
  PRODUCTION DATA.

Full reading width

DATA SHEET

LM35 Precision Centigrade Temperature Sensors

1 Features

Calibrated Directly in Celsius (Centigrade)
Linear + 10-mV/°C Scale Factor
0.5°C Ensured Accuracy (at 25°C)
Rated for Full −55°C to 150°C Range
Suitable for Remote Applications
Low-Cost Due to Wafer-Level Trimming
Operates From 4 V to 30 V
Less Than 60-μA Current Drain
Low Self-Heating, 0.08°C in Still Air
Non-Linearity Only ±¼°C Typical
Low-Impedance Output, 0.1 Ω for 1-mA Load

2 Applications

Power Supplies
Battery Management
HVAC
Appliances

3 Description

The LM35 series are precision integrated-circuit temperature devices with an output voltage linearly-proportional to the Centigrade temperature. The LM35 device has an advantage over linear temperature sensors calibrated in Kelvin, as the user is not required to subtract a large constant voltage from the output to obtain convenient Centigrade scaling. The LM35 device does not require any external calibration or trimming to provide typical accuracies of ±¼°C at room temperature and ±¾°C over a full −55°C to 150°C temperature range. Lower cost is assured by trimming and calibration at the wafer level. The low-output impedance, linear output, and precise inherent calibration of the LM35 device makes interfacing to readout or control circuitry especially easy. The device is used with single power supplies, or with plus and minus supplies. As the LM35 device draws only 60 μA from the supply, it has very low self-heating of less than 0.1°C in still air. The LM35 device is rated to operate over a −55°C to 150°C temperature range, while the LM35C device is rated for a −40°C to 110°C range (−10° with improved accuracy). The LM35-series devices are available packaged in hermetic TO transistor packages, while the LM35C, LM35CA, and LM35D devices are available in the plastic TO-92 transistor package. The LM35D device is available in an 8-lead surface-mount small-outline package and a plastic TO-220 package.

Device Information⁽¹⁾

PART NUMBER	PACKAGE	BODY SIZE (NOM)
LM35	TO-CAN (3)	4.699 mm × 4.699 mm
	TO-92 (3)	4.30 mm × 4.30 mm
	SOIC (8)	4.90 mm × 3.91 mm
	TO-220 (3)	14.986 mm × 10.16 mm

For all available packages, see the orderable addendum at the end of the datasheet.

Basic Centigrade Temperature Sensor
(2°C to 150°C)

Full-Range Centigrade Temperature Sensor

Choose R₁ = –V_S / 50 µA
V_OUT = 1500 mV at 150°C
V_OUT = 250 mV at 25°C
V_OUT = –550 mV at –55°C

4 Revision History

Changes from G Revision (August 2016) to H Revision

Changed NDV Package (TO-CAN) pinout from bottom view back to top view; added textnote to pinoutGo
Added pin numbers to the TO-CAN (TO46) pinoutGo

Changes from F Revision (January 2016) to G Revision

Equation 1, changed From: 10 mV/°F To: 10mv/°C Go
Power Supply Recommendations, changed From: "4-V to 5.5-V power supply" To: "4-V to 30-V power supply:Go

Changes from E Revision (January 2015) to F Revision

Changed NDV Package (TO-CAN) pinout from Top View to Bottom ViewGo

Changes from D Revision (October 2013) to E Revision

Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section Go

Changes from C Revision (July 2013) to D Revision

Changed W to Ω Go
Changed W to Ω in Abs Max tablenote. Go

5 Pin Configuration and Functions

NDV Package

3-Pin TO-CAN

(Top View)

Case is connected to negative pin (GND)

Refer the second NDV0003H page for reference

D Package

8-PIN SOIC

(Top View)

N.C. = No connection

LP Package

3-Pin TO-92

(Bottom View)

NEB Package

3-Pin TO-220

(Top View)

Tab is connected to the negative pin (GND).

NOTE: The LM35DT pinout is different than the discontinued LM35DP

Pin Functions

PIN					TYPE	DESCRIPTION
NAME	TO46	TO92	TO220	SO8	TYPE	DESCRIPTION
V_OUT	2	2	3	1	O	Temperature Sensor Analog Output
N.C.	—	—	—	2	—	No Connection
N.C.	—	—	—	3	—	No Connection
GND	3	3	2	4	GROUND	Device ground pin, connect to power supply negative terminal
N.C.	—	—	—	5	—	No Connection
	—	—	—	6
	—	—	—	7
+V_S	1	1	1	8	POWER	Positive power supply pin

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)⁽¹⁾⁽²⁾

		MIN	MAX	UNIT
Supply voltage		–0.2	35	V
Output voltage		–1	6	V
Output current			10	mA
Maximum Junction Temperature, T_Jmax			150	°C
Storage Temperature, T_stg	TO-CAN, TO-92 Package	–60	150	°C
Storage Temperature, T_stg	TO-220, SOIC Package	–65	150	°C

(1) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications.

(2) 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.

6.2 ESD Ratings

			VALUE	UNIT
V_(ESD)	Electrostatic discharge	Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001⁽¹⁾	±2500	V

(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

		MIN	MAX	UNIT
Specified operating temperature: T_MIN to T_MAX	LM35, LM35A	–55	150	°C
	LM35C, LM35CA	–40	110
	LM35D	0	100
Supply Voltage (+V_S)		4	30	V

6.4 Thermal Information

THERMAL METRIC⁽¹⁾⁽²⁾		LM35				UNIT
		NDV	LP	D	NEB
		3 PINS		8 PINS	3 PINS
R_θJA	Junction-to-ambient thermal resistance	400	180	220	90	°C/W
R_θJC(top)	Junction-to-case (top) thermal resistance	24	—	—	—	°C/W

(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

(2) For additional thermal resistance information, see Typical Application.

6.5 Electrical Characteristics: LM35A, LM35CA Limits

Unless otherwise noted, these specifications apply: −55°C ≤ T_J ≤ 150°C for the LM35 and LM35A; −40°C ≤ T_J ≤ 110°C for the LM35C and LM35CA; and 0°C ≤ T_J ≤ 100°C for the LM35D. V_S= 5 Vdc and I_LOAD= 50 μA, in the circuit of Full-Range Centigrade Temperature Sensor. These specifications also apply from 2°C to T_MAX in the circuit of Figure 14.

PARAMETER	TEST CONDITIONS	LM35A			LM35CA			UNIT
PARAMETER	TEST CONDITIONS	TYP	TESTED LIMIT⁽²⁾	DESIGN LIMIT⁽³⁾	TYP	TESTED LIMIT⁽²⁾	DESIGN LIMIT⁽³⁾	UNIT
Accuracy⁽⁴⁾	T_A = 25°C	±0.2	±0.5		±0.2	±0.5		°C
	T_A = –10°C	±0.3			±0.3		±1
	T_A = T_MAX	±0.4	±1		±0.4	±1
	T_A = T_MIN	±0.4	±1		±0.4		±1.5
Nonlinearity⁽⁵⁾	T_MIN ≤ T_A ≤ T_MAX, –40°C ≤ T_J ≤ 125°C	±0.18		±0.35	±0.15		±0.3	°C
Sensor gain (average slope)	T_MIN ≤ T_A ≤ T_MAX	10	9.9		10		9.9	mV/°C
Sensor gain (average slope)	–40°C ≤ T_J ≤ 125°C	10	10.1		10		10.1	mV/°C
Load regulation⁽¹⁾ 0 ≤ I_L ≤ 1 mA	T_A = 25°C	±0.4	±1		±0.4	±1		mV/mA
Load regulation⁽¹⁾ 0 ≤ I_L ≤ 1 mA	T_MIN ≤ T_A ≤ T_MAX, –40°C ≤ T_J ≤ 125°C	±0.5		±3	±0.5		±3	mV/mA
Line regulation⁽¹⁾	T_A = 25°C	±0.01	±0.05		±0.01	±0.05		mV/V
Line regulation⁽¹⁾	4 V ≤ V_S ≤ 30 V, –40°C ≤ T_J ≤ 125°C	±0.02		±0.1	±0.02		±0.1	mV/V
Quiescent current⁽⁶⁾	V_S = 5 V, 25°C	56	67		56	67		µA
	V_S = 5 V, –40°C ≤ T_J ≤ 125°C	105		131	91		114
	V_S = 30 V, 25°C	56.2	68		56.2	68
	V_S = 30 V, –40°C ≤ T_J ≤ 125°C	105.5		133	91.5		116
Change of quiescent current⁽¹⁾	4 V ≤ V_S ≤ 30 V, 25°C	0.2	1		0.2	1		µA
Change of quiescent current⁽¹⁾	4 V ≤ V_S ≤ 30 V, –40°C ≤ T_J ≤ 125°C	0.5		2	0.5		2	µA
Temperature coefficient of quiescent current	–40°C ≤ T_J ≤ 125°C	0.39		0.5	0.39		0.5	µA/°C
Minimum temperature for rate accuracy	In circuit of Figure 14, I_L = 0	1.5		2	1.5		2	°C
Long term stability	T_J = T_MAX, for 1000 hours	±0.08			±0.08			°C

(1) 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.

(2) Tested Limits are ensured and 100% tested in production.

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

(4) Accuracy is defined as the error between the output voltage and 10 mv/°C times the case temperature of the device, at specified conditions of voltage, current, and temperature (expressed in °C).

(5) Non-linearity is defined as the deviation of the output-voltage-versus-temperature curve from the best-fit straight line, over the rated temperature range of the device.

(6) Quiescent current is defined in the circuit of Figure 14.

6.6 Electrical Characteristics: LM35A, LM35CA

PARAMETER	TEST CONDITIONS		LM35A			LM35CA			UNIT
PARAMETER	TEST CONDITIONS		MIN	TYP	MAX	TYP	TYP	MAX	UNIT
Accuracy⁽⁴⁾	T_A = 25°C			±0.2			±0.2		°C
		Tested Limit⁽²⁾			±0.5			±0.5
		Design Limit⁽³⁾
	T_A = –10°C			±0.3			±0.3
		Tested Limit⁽²⁾
		Design Limit⁽³⁾						±1
	T_A = T_MAX			±0.4			±0.4
		Tested Limit⁽²⁾			±1			±1
		Design Limit⁽³⁾
	T_A = T_MIN			±0.4			±0.4
		Tested Limit⁽²⁾			±1
		Design Limit⁽³⁾						±1.5
Nonlinearity⁽⁵⁾	T_MIN ≤ T_A ≤ T_MAX, –40°C ≤ T_J ≤ 125°C			±0.18			±0.15		°C
		Tested Limit⁽²⁾
		Design Limit⁽³⁾			±0.35			±0.3
Sensor gain (average slope)	T_MIN ≤ T_A ≤ T_MAX			10			10		mV/°C
		Tested Limit⁽²⁾			9.9
		Design Limit⁽³⁾						9.9
	–40°C ≤ T_J ≤ 125°C			10			10
		Tested Limit⁽²⁾			10.1
		Design Limit⁽³⁾						10.1
Load regulation⁽¹⁾ 0 ≤ I_L ≤ 1 mA	T_A = 25°C			±0.4			±0.4		mV/mA
		Tested Limit⁽²⁾			±1			±1
		Design Limit⁽³⁾
	T_MIN ≤ T_A ≤ T_MAX, –40°C ≤ T_J ≤ 125°C			±0.5			±0.5
		Tested Limit⁽²⁾
		Design Limit⁽³⁾			±3			±3
Line regulation⁽¹⁾	T_A = 25°C			±0.01			±0.01		mV/V
		Tested Limit⁽²⁾			±0.05			±0.05
		Design Limit⁽³⁾
	4 V ≤ V_S ≤ 30 V, –40°C ≤ T_J ≤ 125°C			±0.02			±0.02
		Tested Limit⁽²⁾
		Design Limit⁽³⁾			±0.1			±0.1
Quiescent current⁽⁶⁾	V_S = 5 V, 25°C			56			56		µA
		Tested Limit⁽²⁾			67			67
		Design Limit⁽³⁾
	V_S = 5 V, –40°C ≤ T_J ≤ 125°C			105			91
		Tested Limit⁽²⁾
		Design Limit⁽³⁾			131			114
	V_S = 30 V, 25°C			56.2			56.2
		Tested Limit⁽²⁾			68			68
		Design Limit⁽³⁾
	V_S = 30 V, –40°C ≤ T_J ≤ 125°C			105.5			91.5
		Tested Limit⁽²⁾
		Design Limit⁽³⁾			133			116
Change of quiescent current⁽¹⁾	4 V ≤ V_S ≤ 30 V, 25°C			0.2			0.2		µA
		Tested Limit⁽²⁾			1			1
		Design Limit⁽³⁾
	4 V ≤ V_S ≤ 30 V, –40°C ≤ T_J ≤ 125°C			0.5			0.5
		Tested Limit⁽²⁾
		Design Limit⁽³⁾			2			2
Temperature coefficient of quiescent current	–40°C ≤ T_J ≤ 125°C			0.39			0.39		µA/°C
		Tested Limit⁽²⁾
		Design Limit⁽³⁾			0.5			0.5
Minimum temperature for rate accuracy	In circuit of Figure 14, I_L = 0			1.5			1.5		°C
		Tested Limit⁽²⁾
		Design Limit⁽³⁾			2			2
Long term stability	T_J = T_MAX, for 1000 hours			±0.08			±0.08		°C

(2) Tested Limits are ensured and 100% tested in production.

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

(5) Non-linearity is defined as the deviation of the output-voltage-versus-temperature curve from the best-fit straight line, over the rated temperature range of the device.

(6) Quiescent current is defined in the circuit of Figure 14.

6.7 Electrical Characteristics: LM35, LM35C, LM35D Limits

PARAMETER	TEST CONDITIONS	LM35			LM35C, LM35D			UNIT
PARAMETER	TEST CONDITIONS	TYP	TESTED LIMIT⁽²⁾	DESIGN LIMIT⁽³⁾	TYP	TESTED LIMIT⁽²⁾	DESIGN LIMIT⁽³⁾	UNIT
Accuracy, LM35, LM35C⁽⁴⁾	T_A = 25°C	±0.4	±1		±0.4	±1		°C
	T_A = –10°C	±0.5			±0.5		±1.5
	T_A = T_MAX	±0.8	±1.5		±0.8		±1.5
	T_A = T_MIN	±0.8		±1.5	±0.8		±2
Accuracy, LM35D⁽⁴⁾	T_A = 25°C				±0.6	±1.5		°C
	T_A = T_MAX				±0.9		±2
	T_A = T_MIN				±0.9		±2
Nonlinearity⁽⁴⁾	T_MIN ≤ T_A ≤ T_MAX, –40°C ≤ T_J ≤ 125°C	±0.3		±0.5	±0.2		±0.5	°C
Sensor gain (average slope)	T_MIN ≤ T_A ≤ T_MAX, –40°C ≤ T_J ≤ 125°C	10	9.8		10		9.8	mV/°C
Sensor gain (average slope)		10	10.2		10		10.2	mV/°C
Load regulation⁽¹⁾ 0 ≤ I_L ≤ 1 mA	T_A = 25°C	±0.4	±2		±0.4	±2		mV/mA
Load regulation⁽¹⁾ 0 ≤ I_L ≤ 1 mA	T_MIN ≤ T_A ≤ T_MAX, –40°C ≤ T_J ≤ 125°C	±0.5		±5	±0.5		±5	mV/mA
Line regulation⁽¹⁾	T_A = 25°C	±0.01	±0.1		±0.01	±0.1		mV/V
Line regulation⁽¹⁾	4 V ≤ V_S ≤ 30 V, –40°C ≤ T_J ≤ 125°C	±0.02		±0.2	±0.02		±0.2	mV/V
Quiescent current⁽⁵⁾	V_S = 5 V, 25°C	56	80		56	80		µA
	V_S = 5 V, –40°C ≤ T_J ≤ 125°C	105		158	91		138
	V_S = 30 V, 25°C	56.2	82		56.2	82
	V_S = 30 V, –40°C ≤ T_J ≤ 125°C	105.5		161	91.5		141
Change of quiescent current⁽¹⁾	4 V ≤ V_S ≤ 30 V, 25°C	0.2	2		0.2	2		µA
Change of quiescent current⁽¹⁾	4 V ≤ V_S ≤ 30 V, –40°C ≤ T_J ≤ 125°C	0.5		3	0.5		3	µA
Temperature coefficient of quiescent current	–40°C ≤ T_J ≤ 125°C	0.39		0.7	0.39		0.7	µA/°C
Minimum temperature for rate accuracy	In circuit of Figure 14, I_L = 0	1.5		2	1.5		2	°C
Long term stability	T_J = T_MAX, for 1000 hours	±0.08			±0.08			°C

(2) Tested Limits are ensured and 100% tested in production.

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

(4) Non-linearity is defined as the deviation of the output-voltage-versus-temperature curve from the best-fit straight line, over the rated temperature range of the device.

(5) Quiescent current is defined in the circuit of Figure 14.

6.8 Electrical Characteristics: LM35, LM35C, LM35D

PARAMETER	TEST CONDITIONS		LM35			LM35C, LM35D			UNIT
PARAMETER	TEST CONDITIONS		MIN	TYP	MAX	MIN	TYP	MAX	UNIT
Accuracy, LM35, LM35C⁽⁴⁾	T_A = 25°C			±0.4			±0.4		°C
		Tested Limit⁽²⁾			±1			±1
		Design Limit⁽³⁾
	T_A = –10°C			±0.5			±0.5
		Tested Limit⁽²⁾
		Design Limit⁽³⁾						±1.5
	T_A = T_MAX			±0.8			±0.8
		Tested Limit⁽²⁾			±1.5
		Design Limit⁽³⁾						±1.5
	T_A = T_MIN			±0.8			±0.8
		Tested Limit⁽²⁾
		Design Limit⁽³⁾			±1.5			±2
Accuracy, LM35D⁽⁴⁾	T_A = 25°C						±0.6		°C
		Tested Limit⁽²⁾						±1.5
		Design Limit⁽³⁾
	T_A = T_MAX						±0.9
		Tested Limit⁽²⁾
		Design Limit⁽³⁾						±2
	T_A = T_MIN						±0.9
		Tested Limit⁽²⁾
		Design Limit⁽³⁾						±2
Nonlinearity⁽⁵⁾	T_MIN ≤ T_A ≤ T_MAX, –40°C ≤ T_J ≤ 125°C			±0.3			±0.2		°C
		Tested Limit⁽²⁾
		Design Limit⁽³⁾			±0.5			±0.5
Sensor gain (average slope)	T_MIN ≤ T_A ≤ T_MAX, –40°C ≤ T_J ≤ 125°C			10			10		mV/°C
		Tested Limit⁽²⁾			9.8
		Design Limit⁽³⁾						9.8
				10			10
		Tested Limit⁽²⁾			10.2
		Design Limit⁽³⁾						10.2
Load regulation⁽¹⁾ 0 ≤ I_L ≤ 1 mA	T_A = 25°C			±0.4			±0.4		mV/mA
		Tested Limit⁽²⁾			±2			±2
		Design Limit⁽³⁾
	T_MIN ≤ T_A ≤ T_MAX, –40°C ≤ T_J ≤ 125°C			±0.5			±0.5
		Tested Limit⁽²⁾
		Design Limit⁽³⁾			±5			±5
Line regulation⁽¹⁾	T_A = 25°C			±0.01			±0.01		mV/V
		Tested Limit⁽²⁾			±0.1
		Design Limit⁽³⁾						±0.1
	4 V ≤ V_S ≤ 30 V, –40°C ≤ T_J ≤ 125°C			±0.02			±0.02
		Tested Limit⁽²⁾
		Design Limit⁽³⁾			±0.2			±0.2
Quiescent current⁽⁶⁾	V_S = 5 V, 25°C			56			56		µA
		Tested Limit⁽²⁾			80			80
		Design Limit⁽³⁾
	V_S = 5 V, –40°C ≤ T_J ≤ 125°C			105			91
		Tested Limit⁽²⁾
		Design Limit⁽³⁾			158			138
	V_S = 30 V, 25°C			56.2			56.2
		Tested Limit⁽²⁾			82			82
		Design Limit⁽³⁾
	V_S = 30 V, –40°C ≤ T_J ≤ 125°C			105.5			91.5
		Tested Limit⁽²⁾
		Design Limit⁽³⁾			161			141
Change of quiescent current⁽¹⁾	4 V ≤ V_S ≤ 30 V, 25°C			0.2			0.2		µA
		Tested Limit⁽²⁾						2
		Design Limit⁽³⁾			2
	4 V ≤ V_S ≤ 30 V, –40°C ≤ T_J ≤ 125°C			0.5			0.5
		Tested Limit⁽²⁾
		Design Limit⁽³⁾			3			3
Temperature coefficient of quiescent current	–40°C ≤ T_J ≤ 125°C			0.39			0.39		µA/°C
		Tested Limit⁽²⁾
		Design Limit⁽³⁾			0.7			0.7
Minimum temperature for rate accuracy	In circuit of Figure 14, I_L = 0			1.5			1.5		°C
		Tested Limit⁽²⁾
		Design Limit⁽³⁾			2			2
Long term stability	T_J = T_MAX, for 1000 hours			±0.08			±0.08		°C

(2) Tested Limits are ensured and 100% tested in production.

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

(5) Non-linearity is defined as the deviation of the output-voltage-versus-temperature curve from the best-fit straight line, over the rated temperature range of the device.

(6) Quiescent current is defined in the circuit of Figure 14.

6.9 Typical Characteristics

Figure 1. Thermal Resistance Junction To Air

Figure 3. Thermal Response In Still Air

Figure 5. Minimum Supply Voltage vs Temperature

Figure 7. Quiescent Current vs Temperature (in Circuit of Full-Range Centigrade Temperature Sensor)

Figure 9. Accuracy vs Temperature (Ensured)

Figure 11. Start-Up Response

Figure 2. Thermal Time Constant

Figure 4. Thermal Response In Stirred Oil Bath

Figure 6. Quiescent Current vs Temperature (in Circuit of Figure 14)

Figure 8. Accuracy vs Temperature (Ensured)

Figure 10. Noise Voltage

7 Detailed Description

7.1 Overview

The LM35-series devices are precision integrated-circuit temperature sensors, with an output voltage linearly proportional to the Centigrade temperature. The LM35 device has an advantage over linear temperature sensors calibrated in Kelvin, as the user is not required to subtract a large constant voltage from the output to obtain convenient Centigrade scaling. The LM35 device does not require any external calibration or trimming to provide typical accuracies of ± ¼ °C at room temperature and ± ¾ °C over a full −55°C to 150°C temperature range. Lower cost is assured by trimming and calibration at the wafer level. The low output impedance, linear output, and precise inherent calibration of the LM35 device makes interfacing to readout or control circuitry especially easy. The device is used with single power supplies, or with plus and minus supplies. As the LM35 device draws only 60 μA from the supply, it has very low self-heating of less than 0.1°C in still air. The LM35 device is rated to operate over a −55°C to 150°C temperature range, while the LM35C device is rated for a −40°C to 110°C range (−10° with improved accuracy). The temperature-sensing element is comprised of a delta-V BE architecture.

The temperature-sensing element is then buffered by an amplifier and provided to the VOUT pin. The amplifier has a simple class A output stage with typical 0.5-Ω output impedance as shown in the Functional Block Diagram. Therefore the LM35 can only source current and it's sinking capability is limited to 1 μA.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 LM35 Transfer Function

The accuracy specifications of the LM35 are given with respect to a simple linear transfer function:

Equation 1. V_OUT = 10 mv/°C × T

where

V_OUT is the LM35 output voltage
T is the temperature in °C

7.4 Device Functional Modes

The only functional mode of the LM35 is that it has an analog output directly proportional to temperature.