LE A A2A

2008-07-07

5

R

R

in K (T

T, T

e = base of the natural logarithm (e = 2.71828)

B = B value, material specific constant of the NTC

thermistor

Typische Thermistor Kennlinie

2) 7) Seite 16

Typical Thermistor Graph

2) 7) page 16

I

SMD NTC Thermistors

SMD NTC Thermistors

R

25

[Ω]

No. of R/T

characteristic

s*

B

25/50

[K]

B

25/85

[K]

Resistance

Tolerance

Δ R

B value

Tolerance

Δ B/B

10k

EPCOS 8502

3940

3980

± 5%

± 3%

* for further information please visit www.epcos.com

R

T

R

N

e

B

1

T

---

1

T

N

------

–

⎝⎠

⎛⎞

⋅

⋅

=

BB

NT

⁄

TT

N

⋅

TT

N

–

----------------

R

N

R

T

-------

ln

⋅

==

0

0˚C

T

R

Ω

OHL02609

NTC

1000

2000

3000

4000

5000

6000

7000

10000

10 20 30 40 50 60 70

90

Wellenlängengruppen (Dominantwellenlänge)

4) Seite 16

Wavelength Groups (Dominant Wavelength)

4) page 16

Gruppe

Group

amber

Einheit

Unit

min.

max.

3

613

619

nm

4

619

625

nm