Approval sheet
WW08P, WW06P
±
1%,
±
5% 47m ~976m
High Power Low Ohmic Chip Resistors
Size 0805 1/3W ; 0603 1/4W
*Contents in this sheet are subject to change without prior notice.
Page 1 of 7
ASC_WW08-06P_V08
Jul.2010
Approval sheet
FEATURE
1.
2.
3.
4.
5.
Small size and light weight
High reliability and stability
Reduced size of final equipment
High precision
RoHS compliant and Lead free products
APPLICATION
High accuracy dc-power supply
Digital multi-meter
Telecommunication
Computer
Automotive industry
Medical and military equipment
DESCRIPTION
The resistors are constructed in a high grade ceramic body (aluminum oxide). Internal metal electrodes are
added at each end and connected by a resistive paste that is applied to the top surface of the substrate. The
composition of the paste is adjusted to give the approximate resistance required and the value is trimmed to
nominated value within tolerance which controlled by laser trimming of this resistive layer.
The resistive layer is covered with a protective coat. Finally, the two external end terminations are added. For
ease of soldering the outer layer of these end terminations is Tin (lead free) alloy.
Fig 1. Consctruction of Chip-R
Page 2 of 7
ASC_WW08-06P_V08
Jul.2010
Approval sheet
QUICK REFERENCE DATA
Item
Series No.
Size code
Resistance Tolerance
Resistance Range
TCR (ppm/°C) -55°C ~ +155°C
0.047 ~0.091
0.100 ~0.976
Max. dissipation at T
amb
=70°C
Max. Operation Voltage (DC or RMS)
Max. Overload Voltage (DC or RMS)
Climatic category (IEC 60068)
Basic specification
Note :
1.
2.
This is the maximum voltage that may be continuously supplied to the resistor element, see “IEC publication
60115-8”
Max. Operation Voltage : So called RCWV (Rated Continuous Working Voltage) is determined by
WW08P
0805 (2012)
±1%, ±5%
0.047 ~0.976 (E96+E24 series)
≤ ±
200 ppm/°C
≤ ±
150 ppm/°C
1/3 W
150V
300V
55/155/56
JIS C 5201-1:1998 / IEC 60068-2-58:2004
≤ ±
250 ppm/°C
≤ ±
200 ppm/°C
1/4 W
50V
100V
General Specification
WW06P
0603(1608)
RCWV
=
Rated Power
×
Resistance Value
or Max. RCWV listed above, whichever is lower.
DIMENSIONS(unit : mm)
Part No
WW08P
2.00
±
0.10
1.25
±
0.10
0.50
±
0.15
0.40
±
0.20
0.40
±
0.20
WW06P
1.60
±
0.10
0.80
±
0.10
0.45
±
0.15
0.30
±
0.15
0.30
±
0.10
L
W
T
Tb
Tt
MARKING
Each resistor is marked with a three-digit(WW06P ±1%;±5%) or four-digit(WW08P ±1%;±5%) code on the
protective coating to designate the nominal resistance value.
* Remark：0603 resistor value from 0.1 to 0.976 E48/E96 series use 2 significant digits followed by
letter.(Example R560 = R56
；
R402= 59Z)
** Remark：0603 resistor value from 0.047 to 0.091 use the last Two-digits followed by “M” equals “m”, means
1/1000(Example R047 = 47M
；
R050= 50M)
Rated Resistance
Resistance
47m
50m
51m
55m
Code
0805
R047
R050
R051
R055
Code
0603
47M
50M
51M
55M
Resistance
56m
60m
62m
65m
Code
0805
R056
R060
R062
R065
Code
0603
56M
60M
62M
65M
Resistance
68m
70m
75m
80m
Code
0805
R068
R070
R075
R080
Code
0603
68M
70M
75M
80M
Resistance
82m
85m
90m
91m
Code
0805
R082
R085
R090
R091
Code
0603
82M
85M
90M
91M
Page 3 of 7
ASC_WW08-06P_V08
Jul.2010
Approval sheet
FUNCTIONAL DESCRIPTION
Product characterization
Standard values of nominal resistance are taken from the E96&E24 series for resistors with a tolerance of
±1%,±5%.
The values of the E96/E24 series are in accordance with “IEC publication 60063”.
Derating
The power that the resistor can dissipate depends on the operating temperature; see Fig.2
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
Page 4 of 7
ASC_WW08-06P_V08
Jul.2010
Approval sheet
CATALOGUE NUMBERS
The resistors have a catalogue number starting with.
WW08
Size code
WW08: 0805
WW06: 0603
P
Type code
P :Power
0805 size=0.33W
0603 size=0.25W
E96+E24:
R050
Resistance code
“R” is first digit followed by 3
significant digits.(0805)
50mΩ
510mΩ
=R050
=R510
F
Tolerance
J :
±5%
F :
±1%
T
T
Packaging code
: 7” Reeled taping
L
Termination code
L
=
Sn base
(lead free)
paper taping
5Kpcs/reel.
“R” is first digit followed by 2
Significant digit.(0603)
100mΩ
510mΩ
=R10
=R51
E48/E96
E24
0603 0.1 ~0.976
2 significant digits followed by letter
0603 0.047 ~0.091
2 significant digits followed by M
(M=milli ).
(R047=47m)
Reeled tape packaging
: 8mm width paper taping 5000pcs per 7” reel.
Page 5 of 7
ASC_WW08-06P_V08
Jul.2010
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