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238164063109

NTC Thermistors, Radial Leaded, Standard Precision

Vishay Semiconductors 

www.vishay.com

NTCLE100E3

Vishay BCcomponents

RT VALUE AND TOLERANCE

These thermistors have a narrow tolerance on the B-value,

the result of which provides a very small tolerance on the

nominal resistance value over a wide temperature range. For

this reason the usual graphs of R = f(T) are replaced by

Resistance Values at Intermediate Temperatures Tables,

together with a formula to calculate the characteristics with

a high precision.

FORMULAE TO DETERMINE NOMINAL

RESISTANCE VALUES

The resistance values at intermediate temperatures, or the

operating temperature values, can be calculated using the

following interpolation laws (extended “Steinhart and Hart”):

RT = Rref  eA + B  T + C  T2 + D  T3

(1)

TR

=





A1

+

B1

ln

----R-----

Rref

+

C1

ln2

----R-----

Rref

+

D1ln3R----R-r--e--f –1

(2)

where:

A, B, C, D, A1, B1, C1 and D1 are constant values

depending on the material concerned; see table below.

Rref. is the resistance value at a reference temperature (in

this event 25 °C, Rref. = R25).

T is the temperature in K.

Formulae numbered and are interchangeable with an

error of max. 0.005 °C in the range 25 °C to 125 °C and

max. 0.015 °C in the range - 40 °C to + 25 °C.

DETERMINATION OF THE

RESISTANCE/TEMPERATURE DEVIATION

FROM NOMINAL VALUE

The total resistance deviation is obtained by combining

the “R25-tolerance” and the “resistance deviation due to

B-tolerance”.

When:

X = R25-tolerance

Y = resistance deviation due to B-tolerance

Z = complete resistance deviation,

then: Z = 1 + 1----X0---0--  1 + 1----Y0---0-- – 1  100 % or Z  X + Y

When:

TCR = temperature coefficient

T = temperature deviation,

then: T = -----Z------

The temperaTtuCrRe tolerances are plotted in the graphs on the

previous page.

Example: at 0 °C, assume X = 5 %, Y = 0.89 % and

TCR = 5.08 %/K (see table ), then:

Z

=







1 + ----5-----

100



1 + 0----.-8----9--

100

–

1







100%



= 1.05  1.0089 – 1  100 % = 5.9345 %(  5.93 %)

T = -----Z------ = 5----.-9----3-- = 1.167 C   1.17  C

TCR 5.08

A NTC with a R25-value of 10 k has a value of 32.56 k

between - 1.17 °C and + 1.17 °C.

PARAMETER FOR DETERMINING NOMINAL RESISTANCE VALUES

NUMBER

B25/85

(K)

NAME

TOL. B

(%)

A

1

2880

Mat O. with

Bn = 2880K

3

- 9.094

2

2990

Mat P. with

Bn = 3990K

3

- 10.2296

3

3041

Mat Q. with

Bn = 3041K

3

- 11.1334

4

3136

Mat R. with

Bn = 3136K

3

- 12.4493

5

3390

Mat S. with

Bn = 3390K

3

- 12.6814

B

(K)

2251.74

2887.62

3658.73

4702.74

4391.97

C

D

(K2)

(K3)

A1

B1

(K-1)

C1

(K-2)

D1

(K-3)

229098 - 2.744820E+07 3.354016E-03 3.495020E-04 2.095959E-06 4.260615E-07

132336 - 2.502510E+07 3.354016E-03 3.415560E-04 4.955455E-06 4.364236E-07

- 102895 5.166520E+05 3.354016E-03 3.349290E-04 3.683843E-06 7.050455E-07

- 402687 3.196830E+07 3.354016E-03 3.243880E-04 2.658012E-06 - 2.701560E-07

- 232807 1.509643E+07 3.354016E-03 2.993410E-04 2.135133E-06 - 5.672000E-09

6

3528 (1) Mat I. with

3528 (2) Bn = 3528K

0.5

- 12.0596 3687.667 - 7617.13 - 5.914730E+06 3.354016E-03 2.909670E-04 1.632136E-06 7.192200E-08

- 21.0704 11903.95 - 2504699 2.470338E+08 3.354016E-03 2.933908E-04 3.494314E-06 - 7.712690E-07

7

3560

Mat H. with

Bn = 3560K

1.5

- 13.0723 4190.574 - 47158.4 - 1.199256E+07 3.354016E-03 2.884193E-04 4.118032E-06 1.786790E-07

8

3740

Mat B. with

Bn = 3740K

2

- 13.8973 4557.725 - 98275 - 7.522357E+06 3.354016E-03 2.744032E-04 3.666944E-06 1.375492E-07

9

3977

Mat A. with

Bn =3977K

0.75

- 14.6337 4791.842 - 115334 - 3.730535E+06 3.354016E-03 2.569850E-04 2.620131E-06 6.383091E-08

10

4090

Mat C. with

Bn = 4090K

1.5

- 15.5322 5229.973 - 160451 - 5.414091E+06 3.354016E-03 2.519107E-04 3.510939E-06 1.105179E-07

11

4190

Mat D. with

Bn = 4190K

1.5

- 16.0349 5459.339 - 191141 - 3.328322E+06 3.354016E-03 2.460382E-04 3.405377E-06 1.034240E-07

12

4370

Mat E. with

Bn = 4370K

2.5

- 16.8717 5759.15 - 194267 - 6.869149E+06 3.354016E-03 2.367720E-04 3.585140E-06 1.255349E-07

13

4570

Mat F. with

Bn = 4570K

1.5

- 17.6439 6022.726 - 203157 - 7.183526E+06 3.354016E-03 2.264097E-04 3.278184E-06 1.097628E-07

Notes

(1) Temperature < 25 °C

(2) Temperature  25 °C

Revision: 22-Dec-16

4

Document Number: 29049

For technical questions, contact: nlr@vishay.com

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

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