TFPTL

www.vishay.com

Vishay

Revision: 25-Oct-11

4

Document Number: 33027

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

RATIO FORMULA

RT = R25 x (9.0014 x 10-1 + 3.87235 x 10-3 (°C)-1 x T + 4.86825 x 10-6 (°C)-2 x T2 + 1.37559 x 10-9 (°C)-3 x T3)

T(°C) = 28.54 x (

RT/R25)3 - 158.5 x (RT/R25)2 + 474.8 x (RT/R25) - 319.85)

Ratio Tolerance Examples:

At 40 °C, ratio = 1.063 ± 0.5 % (0.005)

so, ratio = 1.058 to 1.068

At 125 °C, ratio = 1.460 ± 3 % (0.044)

so, ratio = 1.416 to 1.504

RATIO TOLERANCES

LOW TEMP.

HIGH TEMP.

TOL.

-55 °C

+150 °C

± 4 %

-40 °C

+125 °C

± 3 %

-20 °C

+85 °C

± 2 %

0 °C

+55 °C

± 1 %

+12 °C

+40 °C

± 0.5 %

- 75

- 50

- 25

0

25

50

75

100

125

150

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.6

1.5

1.7

Temperature in °C

Ratio

R

T/R25

Max.

Min.

Max.

Min.

- 75

- 50

- 25

0

25

50

75

100

150

Temperature in °C

TCR Typical Value

3600

3700

3800

3900

4000

4100

4200

4300

4400

4600

4500

4800

4700

125