Approval sheet

Page 4 of 7

WR18-20-25X(W)_V17

DEC - 2016

MARKING

Each resistor is marked with a four-digit code on the protective coating to designate the nominal resistance

value.

Example:

1R00 =

1



1001

=

1000



0000 =

0



FUNCTIONAL DESCRIPTION

Product characterization

Standard values of nominal resistance are taken from the E96 & E24 series for resistors with a tolerance of

5% & 1%. The values of the E24/E96 series are in accordance with “IEC publication 60063”.

Derating curve

The power that the resistor can dissipate depends on the operating temperature; see Fig.3

Figure 3. Maximum dissipation in percentage of rated power

as a function of the ambient temperature.

MOUNTING

Due to their rectangular shapes and small tolerances, Surface Mountable Resistors are suitable for handling by

automatic placement systems.

Chip placement can be on ceramic substrates and printed-circuit boards (PCBs).

Electrical connection to the circuit is by individual soldering condition.

The end terminations guarantee a reliable contact.