Approval sheet
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 3 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 WW25
CATALOGUE NUMBERS
The resistors have a catalogue number starting with .
L
WW25
K
R010
F
T
Size code
Type code
Resistance code
Tolerance Packaging code
Termination code
WW25 : 2512
K : 2512 2W
R
is first digit followed by
significant digits.
3
T : 7” reeled in tape
L
= Sn base
(lead free)
J : 5%
J : 2512 1W
F : 1%
0.010
= R010
Metal strip Low EMF
WW25J/ WW25K: 4,000 pcs per PC Tape reel
Page 5 of 7
ASC_WW25J WW25K_V05
Dec – 2023