Approval sheet
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 260C 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 235C during 2 seconds. The test
condition for no leaching is 260C 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
The resistors have a catalogue number starting with .
WF25
Size code
P
102
J
T
L
Type code
Resistance code
Tolerance
J : 5%
Packaging
code
Termination
code
WF25 : 2512
WF20 : 2010
WF12 : 1206
WF10 : 1210
WF08 : 0805
WF06 : 0603
WF04 : 0402
P :Power
5% E24: 2 significant digits
followed by No. of zeros
e.g.:
T : 7” Reel
L
= Sn base
(lead free)
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
F : 1%
taping
D : 0.5%
B : 0.1%
P : Jumper
3ohm
=3R0
=100
=563
E : 7” Reel up
side down
taping
10ohm
56Kohm
1% E24+E96:3 significant
digits
followed by No. of zeros
100
=1000
=3742
37.4K
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.
Page 6 of 9
ASC_WFxxP_V03
MAR - 2017