Approval sheet
Page 1 of 10 ASC_WW06 08 12R_V09 FEB - 2017
WW12R, WW08R, WW06R
1%, 5%
Metal Low Ohm Power Chip Resistors
Size 1206 (1W), 0805 (0.5W), 0603 (0.33W)
RoHS Exemption free and Lead free
Sensing Type
*Contents in this sheet are subject to change without prior notice.
Approval sheet
Page 2 of 10 ASC_WW06 08 12R_V09 FEB - 2017
FEATURE
1. Metal ultra low and stable TCR performance
2. High power rating and compact size
3. High reliability and stability
4. Reduced size of final equipment
5. RoHS exemption free & Halogen free & Lead free
6. Inductance below 1nH
APPLICATION
Power supply
PDA
Digital meter
Computer
Automotives
Battery charger
DC-DC power converter
DESCRIPTION
The resistors are constructed in a high grade low resistive metal body. The resistive layer is covered with a
protective coat and printed a resistance marking code over it. Finally, the two external end terminations are
added. For ease of soldering the outer layer of these end terminations is a Lead free terminations.
Fig 1. Construction of Chip-R
Approval sheet
Page 3 of 10 ASC_WW06 08 12R_V09 FEB - 2017
QUICK REFERENCE DATA
Item
General Specification
Series No.
WW06R
WW08R
WW12R
Size code
0603 ( 1608 )
0805 ( 2012 )
1206 (3216)
Resistance Tolerance
5% , 1%
Resistance Range
5, 10mΩ
2, 3, 4, 5, 6, 7, 8, 9 10mΩ,
1 ~ 15 mΩ
TCR (ppm/C)
±70 ppm/C
Max. power at Tamb=70C
1/3 W
1/2 W
1W
Max. Operation Current
(DC or RMS)
8.1A, 5.7A
7A ~ 15.8A
31.6A ~ 8.2A
Operation temperature
-55 ~ +155’C
Note : Max. Operation Current : So called RCWC (Rated Continuous Working Current) is determined by
listed above.
MECHANICAL DATA
Unit: mm
Type
Size (inch)
Resistance
L (mm)
W (mm)
H (mm)
c (mm)
d (mm)
WW06R
0603
5mΩ
1.60±0.10
0.80±0.10
0.33±0.10
0.20±0.10
0.50±0.10
10mΩ
0.30±0.10
0.20±0.10
0.30±0.10
WW08R
0805
2mΩ
2.0±0.15
1.25±0.15
0.22±0.10
0.35±0.10
0.55±0.20
3mΩ
0.45±0.10
0.35±0.10
0.75±0.20
4mΩ
0.35±0.10
0.35±0.10
0.75±0.20
5mΩ
0.35±0.10
0.35±0.10
0.60±0.20
6mΩ
0.35±0.10
0.35±0.10
0.47±0.20
7mΩ
0.22±0.10
0.35±0.10
0.75±0.20
8mΩ
0.22±0.10
0.35±0.10
0.60±0.20
9mΩ
0.22±0.10
0.35±0.10
0.52±0.20
10mΩ
0.22±0.10
0.30±0.10
0.47±0.20
WW12R
1206
1mΩ
3.2±0.15
1.60±0.15
0.32±0.10
1.10±0.25
Approval sheet
Page 4 of 10 ASC_WW06 08 12R_V09 FEB - 2017
2mΩ
0.32±0.10
0.50±0.25
3mΩ
0.35±0.10
0.70±0.25
1.30±0.25
4mΩ
0.35±0.10
1.10±0.25
5mΩ
0.35±0.10
1.00±0.25
6mΩ
0.35±0.1
0.80±0.25
7mΩ
0.35±0.1
0.70±0.25
8mΩ
0.35±0.1
0.50±0.25
9mΩ
0.28±0.1
0.55±0.25
10mΩ
0.28±0.1
0.50±0.25
11mΩ
0.22±0.1
0.80±0.25
12mΩ
0.22±0.1
0.70±0.25
13mΩ
0.22±0.1
0.60±0.25
14mΩ
0.22±0.1
0.55±0.25
15mΩ
0.22±0.1
0.50±0.25
MARKING
WW12R/WW08R each resistor is marked with a 2-digit code with underline on the protective coating to
designate the nominal resistance value. WW06R has no marking!
Example:
05 = 0.005
10 = 0.010
FUNCTIONAL DESCRIPTION
Derating curve
The power that the resistor can dissipate depends on the operating temperature; see Fig.2
Approval sheet
Page 5 of 10 ASC_WW06 08 12R_V09 FEB - 2017
SOLDERING CONDITIONS
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 245C during 3 seconds within lead-free solder bath.
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 WWxxR
CATALOGUE NUMBERS
The resistors have a catalogue number starting with .
WW06
R
R005
J
T
L
Size code
WW06 : 0603
WW08 : 0805
WW12 :1206
Type code
R : 1/3W, 0603
1/2W, 0805
1W, 1206
Resistance code
R is first digit followed by 3
significant digits.
0.010 = R010
0.005 = R005
Tolerance
J : 5%
F : 1%
Packaging code
T : 7” reel
Q : 10” reel
Termination code
L = Sn base
(lead free)
Reeled tape packaging : 8mm width paper taping 5,000pcs per 7” reel. 10,000pcs per 10” reel.
Approval sheet
Page 6 of 10 ASC_WW06 08 12R_V09 FEB - 2017
RESISTANCE MEASUREMENT SCHEMATIC DIAGRAM
The resistance measured is based on mounted on PCB to match with customer field
application.
RECOMMENDED PCB LAND PATTERN
WW06R
WW08R
WW12R
Approval sheet
Page 7 of 10 ASC_WW06 08 12R_V09 FEB - 2017
TEST & REQUIREMENTS
Approval sheet
Page 8 of 10 ASC_WW06 08 12R_V09 FEB - 2017
Approval sheet
Page 9 of 10 ASC_WW06 08 12R_V09 FEB - 2017
(1%+0.0005ohm)
(1%+0.0005ohm)
Approval sheet
Page 10 of 10 ASC_WW06 08 12R_V09 FEB - 2017
(1%+0.0005ohm)
(1%+0.0005ohm)
Approval sheet
Page 11 of 10 ASC_WW06 08 12R_V09 FEB - 2017
PACKAGING
Paper Tape specifications (unit :mm)
Symbol
A
B
W
F
E
WW06R
1.90±0.20
1.15±0.15
8.00±0.20
3.50±0.05
1.75±0.10
WW08R
2.50±0.20
1.65±0.15
WW12R
3.60±0.20
2.00±0.15
Symbol
P1
P0
D
T
WW06R
4.00±0.10
4.00±0.10
1.0 0.0
50.1
0.8 max.
WW08R
1.0 max.
WW12R
1.0 max.
Reel dimensions
Symbol
A
B
C
D
7”
180.0 -1.5
60.0±1.0
13.0±0.2
9.0 +1.0
10”
254.0 ±2.0
100.0±1.0
13.0±0.2
9.0 +1.0
Taping quantity
- Chip resistors 5,000 pcs per 7” reel; 10,000pcs per 10” reel.