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# LM35: Narrower range of Nonlinearity

Part Number: LM35
Other Parts Discussed in Thread: LMT70, , TMP117

Hi,

I need to compare the exact uncertainty of LM35 and LMT70.

From the datasheet, We already know the Nonlinearity of LM35CA is ±0.15℃, but this is the case just in -40℃ to +125℃.

Tell me the Nonlinearity in narrower range like -20℃ to 60℃.

Moreover, I want to check this "the output-voltage-versus-temperture curve" that defines Non-linearity.

↑　is the note in LM35 datasheet.

If you have V-T table of LM35 like LMT70 have, it will help me.

Best Regards,

• Hello,

Thank you for posting to the Sensing forum.

The nonlinearity of the LM35CA was characterized across the entire specified temperature range, but due to the age of the part I am not able to find additional data for a narrower temperature range.

Additionally, there is no LUT we can provide for this part that is similar to the one found in the LMT70 datasheet.

Best regards,

Nicole

• Dear Sasajima -

to add to Nicole's reply, the transfer function (equation) is given in the datasheet. Using the device at negative temperatures, will require you to use a load resistor and two diodes to ground (as shown in Figure 18 on page 16 of the datasheet)

Vout = 10mV/°C x Temp, which can be rewritten to Vout/10mV/°C = Temp and put into Excel to produce:

 TEMP Vout Gain (step size) -55 -550.00E-3 10.0E-3 -50 -500.00E-3 10.0E-3 -45 -450.00E-3 10.0E-3 -40 -400.00E-3 10.0E-3 -35 -350.00E-3 10.0E-3 -30 -300.00E-3 10.0E-3 -25 -250.00E-3 10.0E-3 -20 -200.00E-3 10.0E-3 -15 -150.00E-3 10.0E-3 -10 -100.00E-3 10.0E-3 -5 -50.00E-3 10.0E-3 0 000.00E+0 10.0E-3 5 50.00E-3 10.0E-3 10 100.00E-3 10.0E-3 15 150.00E-3 10.0E-3 20 200.00E-3 10.0E-3 25 250.00E-3 10.0E-3 30 300.00E-3 10.0E-3 35 350.00E-3 10.0E-3 40 400.00E-3 10.0E-3 45 450.00E-3 10.0E-3 50 500.00E-3 10.0E-3 55 550.00E-3 10.0E-3 60 600.00E-3 10.0E-3 65 650.00E-3 10.0E-3 70 700.00E-3 10.0E-3 75 750.00E-3 10.0E-3 80 800.00E-3 10.0E-3 85 850.00E-3 10.0E-3 90 900.00E-3 10.0E-3 95 950.00E-3 10.0E-3 100 1.00E+0 10.0E-3 105 1.05E+0 10.0E-3 110 1.10E+0 10.0E-3 115 1.15E+0 10.0E-3 120 1.20E+0 10.0E-3 125 1.25E+0 10.0E-3 130 1.30E+0 10.0E-3 135 1.35E+0 10.0E-3 140 1.40E+0 10.0E-3 145 1.45E+0 10.0E-3 150 1.50E+0 10.0E-3
• Thank you for replying ;)

I' m sad but will think about to use LMT70 or TMP117.

Regards,

sasajima