Approval sheet
WW25W, WW20W, WW10W, WW12W,
WW08W, WW06W
1%, 5%
Thick Film Normal Low Ohm Chip Resistors
RoHS Exemption free and Lead free
Size 2512, 2010, 1210, 1206, 0805, 0603
Anti-Sulfuration FOS 105’C 750hrs compliant
*Contents in this sheet are subject to change without prior notice.
Page 1 of 8
ASC_WWxxW_V02
MAR - 2018
Approval sheet
FEATURE
1. High power rating and low TCR
2. High reliability and stability
3. Reduced size of final equipment
4. RoHS exemption free and Lead free products
5. Anti-Sulfuration FOS 105’C 750hrs compliant
APPLICATION
Power supply
PDA
Digital meter
Computer
Automotives
Battery charger
DC-DC power converter
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. Construction of Chip-R
Page 2 of 8
ASC_WWxxW_V02
MAR - 2018
Approval sheet
QUICK REFERENCE DATA
Item
General Specification
Series No.
WW25W
WW20W
WW10W
Size code
2512 (6432)
2010 (5025)
1210 ( 3225 )
WW12W
WW08W
WW06W
1206 ( 3216 )
0805 ( 2012 )
0603 ( 1608 )
5%, 1%
Resistance
Tolerance
Resistance
0.010 ~ 0.910,
0.050 ~ 0.910,
E24
E24
Range
TCR (ppm/C)
Max. dissipation
at Tamb=70C
10 - 20m: 1000
10 - 20m: 1000
10 - 20m: 600
10 - 20m: 1000
10 - 20m: 1000
50 - 91m: 400
22 - 39m: 600
22 - 39m: 600
22 - 39m: 400
22 - 39m: 600
22 - 39m: 600
100 - 910m: 200
40 - 47m: 200
40 - 47m: 200
40 - 47m: 200
40 - 47m: 200
40 - 47m: 400
50 - 91m: 100
50 - 91m: 100
50 - 91m: 100
50 - 91m: 100
50 - 91m: 200
100 - 910m: 100
100 - 910m: 100
100 - 910m: 100
100 - 910m: 100
100 - 910m: 100
1W
3/4W
2/3 W
1/3 W
1/4 W
Operation
-55 ~ +155’C
temperature
Symbol
WW25W
WW20W
WW10W
WW12W
WW08W
WW06W
L
6.30 0.20
5.00 0.20
3.10 0.10
3.10 0.10
2.00 0.10
1.60 0.10
W
3.10 0.20
2.50 0.20
2.60 0.10
1.60 0.10
1.25 0.10
0.80 0.10
T
0.60 0.15
0.60 0.10
0.55 0.10
0.55 0.10
0.50 0.10
0.45 0.10
C
0.60 0.25
0.60 0.25
0.50 0.25
0.50 0.25
0.40 0.20
0.30 0.20
D
0.90 0.25
0.60 0.25
0.50 0.25
0.50 0.25
0.40 0.20
0.30 0.20
Symbol
WW25W
WW20W
WW10W
WW12W
WW08W
L
6.30 0.20
5.00 0.20
3.10 0.15
3.10 0.15
2.00 0.10
W
3.10 0.20
2.50 0.20
2.60 0.10
1.60 0.10
1.25 0.10
T
0.60 0.15
0.60 0.10
0.60 0.10
0.55 0.10
0.60 0.10
C
0.25 0.25
0.25 0.25
0.25 0.25
0.25 0.20
0.25 0.20
D
1.80 0.30
1.10 0.25
0.90 0.25
0.90 0.25
0.65 0.20
Page 3 of 8
1/8 W
ASC_WWxxW_V02
MAR - 2018
Approval sheet
RECOMMENDED SOLDERING PAD
Symbol
WW25W
WW20W
WW10W
WW12W
WW08W
WW06W
WL
3.70mm
3.00mm
3.00mm
1.80mm
1.30mm
0.90mm
D
1.60mm
1.50mm
1.30mm
1.30mm
1.15mm
1.00mm
L
7.60mm
6.80mm
4.70mm
4.70mm
3.50mm
3.00mm
MARKING
4-digits marking for 2512, 2010, 1210, 1206, 0805 size
Each resistor is marked with a four-digit code on the protective coating to designate the nominal resistance
value.
3-digits marking for 0603 size
Each resistor is marked with a three -digit code on the protective coating to designate the nominal
resistance value.
Page 4 of 8
ASC_WWxxW_V02
MAR - 2018
Approval sheet
FUNCTIONAL DESCRIPTION
Product characterization
Standard values of nominal resistance are taken from the E24 series for resistors with a tolerance of 5% &
1%. The values of the E24 series are in accordance with “IEC publication 60063”.
Derating curve
The power that the resistor can dissipate depends on the operating temperature; see Fig.2
Figure 2
Maximum dissipation in percentage of rated power as a
function of the ambient temperature
SOLDERING CONDITION follows J-STD-020D
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
Page 5 of 8
ASC_WWxxW_V02
MAR - 2018
Approval sheet
CATALOGUE NUMBERS
The resistors have a catalogue number starting with:
WW12
W
R020
F
T
L
Size code
Type code
Resistance code
Tolerance
Packaging code
Termination code
WW25 : 2512
W : Thick film
Power low ohm
low TCR
0.020 = R020
J : 5%
T : 7” Reel taping
0.510 = R510
F : 1%
Q : 10” Reel taping
L = Sn base (lead
free)
WW20 : 2010
WW10 : 1210
G : 13” Reel taping
0.025 = R025
WW12 : 1206
WW08 : 0805
WW06 : 0603
Tape packaging WW10, WW12,WW08, WW06 : 8mm width paper taping
5,000pcs per 7” reel;
10,000pcs per 10” reel;
20,000pcs per 13” reel.
WW25, WW20: 12mm width emboss taping
4,000pcs per 7” reel;
8,000pcs per 10” reel;
16,000pcs per 13” reel.
Page 6 of 8
ASC_WWxxW_V02
MAR - 2018
Approval sheet
TEST AND REQUIREMENTS(JIS C 5201-1 : 1998)
TEST
Temperature Coefficient of
Resistance(T.C.R)
Clause 4.8
PROCEDURE
Natural resistance change per change in degree centigrade.
R2 R1
106
R1 t2 t1
REQUIREMENT
Refer to
“QUICK REFERENCE DATA”
(ppm/C) t1 : 25°C
R1 : Resistance at reference temperature 25°C
R2 : Resistance at test temperature 155°C
Short time overload
(S.T.O.L)
Clause 4.13
Permanent resistance change after a 5second application of a 5 J: R/R max. ±(2%+0.5m)
times rated power.
F: R/R max. ±(1%+0.5m)
Solderability
Un-mounted chips completely immersed for 3±0.5 second in a SAC good tinning (>95% covered)
solder bath at 245℃±2℃
no visible damage
Clause 4.17
Resistance to soldering
heat(R.S.H)
Clause 4.18
Temperature cycling
Clause 4.19
Load life (endurance)
Clause 4.25
Load life in Humidity
Clause 4.24
Bending strength
Un-mounted chips completely immersed for 10±1 second in a SAC no visible damage
solder bath at 260℃±5ºC
J: R/R max. ±(1%+0.5m)
F: R/R max. ±(0.5%+0.5m)
30 minutes at -55C3C, 2~3 minutes at 20°C+5°C-1°C, 30 minutes no visible damage
at +155C3C, 2~3 minutes at 20°C+5°C-1°C, total 5 continuous J: R/R max. ±(1%+0.5m)
cycles
F: R/R max. ±(0.5%+0.5m)
1000 +48/-0 hours, loaded with RCWV or Vmax in chamber controller J: R/R max. ±(3%+0.5m)
70±2ºC, 1.5 hours on and 0.5 hours off
F: R/R max. ±(1%+0.5m)
1000 +48/-0 hours, loaded with RCWV or Vmax in humidity chamber J: R/R max. ±(3%+0.5m)
controller at 40C2C and 90~95% relative humidity, 1.5hours on
F: R/R max. ±(1%+0.5m)
and 0.5 hours off
Clause 4.33
Resistors mounted on a 90mm glass epoxy resin PCB(FR4); no visible damage
bending : 3mm for 0603/0805, 2mm for 1206 and above sizes, once J: R/R max. ±(1%+0.5m)
for 10 seconds
F: R/R max. ±(0.5%+0.5m)
Adhesion
Pressurizing force: 5N, Test time: 10±1sec.
Clause 4.32
Insulation Resistance
No remarkable damage
removal of the terminations
Test voltage: 100+/-15V
I.R≧1GΩ
Clause 4.6
Sulfuration test
ASTM B-809-95 105’C 750hrs
R/R max. ±(2%+0.5m)
or
ASTM B-809-95
Page 7 of 8
ASC_WWxxW_V02
MAR - 2018
Approval sheet
PACKAGING
Paper Tape specifications (unit :mm)
Series No.
A
B
W
WW25W
6.70±0.20
3.50±0.20
12.00±0.30
WW20W
5.50±0.20
2.80±0.20
12.00±0.30
WW10W
3.60±0.20
3.00±0.20
WW12W
3.60±0.20
2.00±0.20
WW08W
2.40±0.20
1.65±0.20
WW06W
1.90±0.20
1.10±0.20
Series No.
P1
P0
F
E
3.50±0.20
1.75±0.10
8.00±0.30
D
T
WW25W
Max. 1.2
WW20W
Max. 1.2
WW10W
4.00±0.10
4.00±0.10
WW12W
1.5000..10
Max. 1.0
Max. 1.0
WW08W
Max. 1.0
WW06W
Max. 0.8
Reel dimensions
Page 8 of 8
Symbol
A
B
7” reel
178.0±2.0
60.0±1.0
10” reel
254.0±2.0
100.0±1.0
13: reel
330.0±2.0
100.0±1.0
C
D
10.0±1.5 ( 8mm tape )
13.0±0.5
ASC_WWxxW_V02
13.8±1.5 (12mm tape)
MAR - 2018
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