1

NTC Leadless Disc Thermistors

Types

NR

Marking

On package only / On parts upon request

Operating temperature

-40°C to +200°C

Custom - designed products defined with:

Values and tolerances

D ± D R

E ± E R

DESIGN OF THE THERMISTOR

Choice of the resistances

If the application is to measure the temperature around a

defined point, a unique nominal resistance can be chosen

(for example, among standard values of the ND range prod-

ucts presented on pages 20 to 24).

When it is required to measure the temperature over selected

ranges T

R

on the R (T) characteristic of an existing NTC material

(for example among standard materials whose R (T) are

displayed on pages 29 to 33).

The resistances must also be compatible with the resistivity

of the material and the dimensions of the thermistor.

Choice of the tolerances

The precision of the temperature measurement determines

the calculation of the tolerance on the resistance:

R/R =

(%/°C).

T (°C)

For example, the NTC NR55--3049-99, using “N5” material

(R (T) characteristic displayed on page 31), requires a preci-

sion of 1°C over the temperature range 110°C - 120°C.

The tolerances can be calculated:

*For your specific requirements, please consult us.

D

Metallization

E

Physical data (dim. in mm)

HOW TO ORDER

NR55 -

Type

- 3002 - 99

P/N Code

This type of product is widely used in automotive and

consumer applications.

They are assembled in custom-probes for sensing the

temperature of liquids (water, oil, ...), gases or surface of any

other component.

The metallization covers completely the surfaces of the

thermistor.

The particularly flat and smooth surfaces ensure an excellent

electrical and thermal contact under pressure.