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
The resistors have a catalogue number starting with .
L
WW20
M
R005
J
T
Size code
Type code
M : 1/2W
Resistance code
Tolerance
J : ±5%
F : ±1%
Packaging code
Termination code
WW20 : 2010
R is first digit followed by 3
significant digits.
T : 7” reeled in tape
L
= Sn base (lead
free)
Sensing type
0.010Ω
0.005Ω
=
=
R010
R005
Reeled tape packaging
: 12mm width plastic emboss taping 4,000pcs per reel.
Page 5 of 7
WW20M_V07
Jul.2010
00-S-R28-E