Approval sheet

Page 6 of 9

ASC_WFxxP_V03

MAR - 2017

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.

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 Fig 3.

Fig 3. Infrared soldering profile for Chip Resistors

CATALOGUE NUMBERS

WF25

P

102

J

T

L

Size code

WF25

: 2512

WF20

: 2010

WF12

: 1206

WF10

: 1210

WF08

: 0805

WF06

: 0603

WF04

: 0402

Type code

P :Power

2512 size = 2W

2010 size = 1W

1206 size = 1/2W

1210 size = 1/2W

0805 size = 1/4W

0603 szie = 1/8W

0402 size = 1/8W

Resistance code

5% E24: 2 significant digits

followed by No. of

zeros

e.g.:

3ohm

=3R0

10ohm

=100

56Kohm

=563

1%

E24+E96:3

significant

digits

followed by No. of zeros

100



=1000

37.4K



=3742

Tolerance

J :

5%

F :

1%

D :

0.5%

B :

0.1%

P : Jumper

Packaging

code

T

: 7” Reel

taping

E : 7

” Reel up

side down

taping

Termination

code

L = Sn base

(lead free)

Tape packaging

WF12, WF10, WF08, WF06 : 8mm width paper taping 5,000pcs per reel.

WF04: 8mm width paper taping 10,000pcs per reel.

WF25, WF20:

12mm width plastic taping 4,000pcs per reel.