LM35DZ - RS Components

Temperature sensor ic

LM35CZ and LM35DZ

Issued March 1997

Data Pack E

RS stock numbers 317-954 and 317-960

The LM35 is a precision semiconductor temperature

sensor giving an output of 10mV per degree

Centigrade. Unlike devices with outputs proportional

to the absolute temperature (in degrees Kelvin) there

is no large offset voltage which, in most applications,

will have to be removed.

Accuracies of 1/4°C at room temperature or 3/4°C over

the full temperature range are typical.

Absolute maximum ratings(Note 10)

Supply voltage _____________________+35V to -0.2V

Output voltage _______________________+6V to -1.0V

Output current ____________________________10mA

Storage temperature, TO-92 package _-60°C to +150°C

Lead temperature (soldering, 10 seconds) ____260°C

Specified operating temperature range

TMIN to TMAX (Note 2)

LM35CZ ________________________ -40°C to +110°C

LM35DZ __________________________ 0°C to +100°C

Features

●Output proportional to °C

●Wide temperature range -40°C to +110°C

(CZ version)

●Accurate 1/4°C at room temperature typical

●Linear output 0.2°C typical

●Low current drain (60µA typical)

●Low self heating (0.08°C typical)

●Output impedance 0.1Ωat 1mA

●Standard T092 package.

Pin connections

Package details

232-2958

Data Sheet

232-2958

Notes:

1. Unless otherwise noted, these specifications apply: -40°≤TJ≤+ 110°C for the LM35C and 0°≤TJ≤+100°C for the LM35D. VS= +5Vdc and

ILOAD = 50µA, in the circuit of Figure 2. These specifications also apply from +2°C to TMAX in the circuit of Figure 1. Specifications in

boldfaceapply over the full rated temperature range.

2. Thermal resistance of the TO-92 package is 180°C/W junction to ambient.

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.

4. Tested limits are guaranteed and 100% tested in production.

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.

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

7. Accuracy is defined as the error between the output voltage and 10mV/°C times the device's case temperature, at specified conditions of

voltage, current, and temperature (expressed in °C).

8. Non linearity 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.

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

10. Absolute maximum ratings indicate limits beyond which damage to the device may occur. dc and ac electrical specifications are not

ensured when operating the device at absolute maximum ratings.

LM35CZ, LM35DZ

Parameter Conditions Tested Design Units

Typical Limit Limit (Max.)

(Note 4) (Note 5)

Accuracy, TA= +25°C ±0.4 ±1.0 °C

LM35, LM35C TA= -10°C ±0.5 ±1.5 °C

(Note 7) TA= TMAX ±0.8 ±1.5 °C

TA= TMIN ±0.8 ±2.0

Accuracy, TA= +25°C ±0.6 ±1.5 °C

LM35D TA= TMAX ±0.9 ±2.0 °C

(Note 7) TA= TMIN ±0.9 ±2.0 °C

Non linearity TMIN≤TA≤TMAX ±0.2 ±0.5 °C

(Note 8)

Sensor gain TMIN≤TA≤TMAX +10.0 +9.8 mV/°C

(Average slope) +10.2

Load regulation TA= +25°C ±0.4 ±2.0 mV/mA

(Note 3) 0≤IL≤1mA TMIN≤TA≤TMAX ±0.5 ±5.0 mV/mA

Line regulation TA= +25°C ±0.01 ±0.1 mV/V

(Note 3) 4V≤VS±≤30V ±0.02 ±0.2 mV/V

Quiescent current VS= +5V, +25°C 56 80 µA

(Note 9) VS= +5V 91 138 µA

VS= +30V, +25°C 56.2 82 µA

VS= +30V 91.5 141 µA

Change of 4V≤VS≤30V, +25°C 0.2 2.0 µA

quiescent current 4V≤VS≤30V 0.5 3.0 µA

(Note 3)

Temperature coefficient of +0.39 +0.7 µA/°C

quiescent current

Minimum temperature In circuit of +1.5 +2.0 °C

for rated accuracy Figure 1, IL= 0

Long term stability TJ-TMAX, for +0.08 °C

1000 hours

Electrical characteristics(Note 1) (Note 6)

232-2958

Application notes

The circuit shown in Figure 1 is a basic single ended

temperature sensor capable of measuring between

+2°C and +100°C or +110°C depending on version.

To measure negative temperatures a negative supply

is required as shown in Figure 2.

R1 should be selected as follows:

R1 = 50 310-6

Care must be taken when driving capacitive load, such

as long cables or any load exceeding 50pF.

To remove the effect of capacitive loads the circuit

shown Figure 3 should be used, however the resistor is

added to the output impedance making this circuit suit-

able for connection to high impedance loads only.

Figure 4 shows a circuit when will overcome this prob-

lem and also give protection from radiated interference

from relays or any other source of electrical noise.

Figure 1

Figure 4

Figure 2

Figure 3

The circuits below show some typical applications of

these temperature sensors.

-Vs

Figure 5 Two-wire remote temperature sensor

with sensor grounded

Figure 6 Two-wire remote temperature sensor

232-2958

Figure 7 Temperature sensor, single supply,

capable of measuring negative

temperatures

Figure 8 Centigrade thermometer

Figure 9 Expanded scale thermometer

The information provided in RS technical literature is believed to be accurate and reliable; however, RS Components assumes no responsibility for inaccuracies

or omissions, or for the use of this information, and all use of such information shall be entirely at the user’s own risk.

No responsibility is assumed by RS Components for any infringements of patents or other rights of third parties which may result from its use.

Specifications shown in RS Components technical literature are subject to change without notice.

RS Components, PO Box 99, Corby, Northants, NN17 9RS Telephone: 01536 201234