Approval sheet

Page 5 of 7

WR18-20-25X(W)_V17

DEC - 2016

SOLDERING CONDITION

The robust construction of chip resistors allows them to be completely immersed in a solder bath of 260

C

for 10 seconds. Therefore, it is possible to mount Surface Mount Resistors on one side of a PCB and other

discrete components on the reverse (mixed PCBs).

Surface Mount Resistors are tested for solderability at 235

C during 2 seconds. The test condition for no

leaching is 260

C for 30 seconds. Typical examples of soldering processes that provide reliable joints

without any damage are given in below.

CATALOGUE NUMBERS

The resistors have a catalogue number starting with .

WR20

X

472_

J

T

L

Size code

WR25 : 2512

WR20 : 2010

WR18: 1218

Type code

X :

5%: 1-10M

1%: 10-1M

W :

1% : <10

 or

>1M



Resistance code

5% E24 : 2 significant digits

followed by no. of zeros and

a blank

4.7



=4R7_

10



=100_

1% E24+E96: 3 significant digits

followed by no. of zeros

102



=1020

37.4K



=3742

Tolerance

J :

5%

F :

1%

P : Jumper

Packaging code

T : 7

” Reel taping

(T:1218 10

” Reel)

Q : 10

” Reel taping

G : 13

” Reel taping

Termination code

L = Sn base (lead

free)

3-5 sec