Approval sheet
MARKING
Each resistor is marked with a four-digit code on 2512/1206 & three-digit code on 0805 & two-digit on
0603 protective coating to designate the nominal resistance value.0402 has no marking.
Example:
R020 = 0.02 ( WW25D/WW12D )
020 = 0.02 ( WW08D )
20 = 0.02 ( WW06D )
FUNCTIONAL DESCRIPTION
Derating curve
The power that the resistor can dissipate depends on the operating temperature; see Fig.2
STORAGE CONDITIONS
Under airtight in temperature+10℃~40℃、relative humidity ≦75% can store 2 years.
Without dew in temperature+10℃~60℃、relative humidity be 95% maximum value for 30days.
SOLDERING CONDITIONS
The robust construction of chip resistors allows them to be completely immersed in a solder bath of 260C for
max.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).
Typical examples of soldering processes that provide reliable joints without any damage are given in Fig3
as below.
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ASC_WWxxD_V10
Dec - 2023