WR12W / WR08W / WR06W / WR04W
±
1% (1Ω~9.76Ω, 1.02MΩ~10MΩ)
Ω
Ω
Ω
Ω
General purpose chip resistors
Size 1206 / 0805 / 0603 / 0402
Customer
:
Approval No :
Issue Date
:
Customer Approval :
Page 1 of 7
WR12-08-06-04W
Ver.17
April.-2010
FEATURE
1. High reliability and stability
2. Reduced size of final equipment
3. Lower assembly costs
4. Higher component and equipment reliability
5. LoHS compliant and Lead free products
APPLICATION
•
•
•
•
Consumer electrical equipment
Automotive application
EDP, Computer application
Telecom application
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
within tolerance by laser cutting 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) solder alloy.
Fig 1. Consctruction of a Chip-R
Page 2 of 7
WR12-08-06-04W
Ver.17
April.-2010
QUICK REFERENCE DATA
Item
Series No.
Size code
Resistance Tolerance
Resistance Range
TCR (ppm/°C)
≤ ±
200 ppm/°C
Max. dissipation at T
amb
=70°C
Max. Operation Voltage (DC or RMS)
Max. Overload Voltage (DC or RMS)
Climatic category
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
RCWV
=
Rated Power
×
Resistance Value or Max. RCWV listed above, whichever is lower.
3.
Lead free terminations upon customer requested.
General Specification
WR12W
1206 (3216)
WR08W
0805 (2012)
WR06W
0603 (1608)
WR04W
0402 (1005)
±1%
(E96 series)
1Ω ~ 9.76Ω, 1.02MΩ ~ 10MΩ
1/4 W
200V
400V
1/8 W
150V
300V
55/155/56
1/10 W
50V
100V
1/16 W
50V
100V
Dimensions
(unit : mm)
WR12W
L
W
T
Tb
Tt
3.10
±
0.10
1.60
±
0.10
0.60
±
0.15
0.45
±
0.20
0.50
±
0.20
WR08W
2.00
±
0.10
1.25
±
0.10
0.50
±
0.15
0.40
±
0.20
0.40
±
0.20
WR06W
1.60
±
0.10
0.80
±
0.10
0.45
±
0.15
0.30
±
0.20
0.30
±
0.10
WR04W
1.00
±
0.05
0.50
±
0.05
0.35
±
0.05
0.25
±
0.10
0.20
±
0.10
Page 3 of 7
WR12-08-06-04W
Ver.17
April.-2010
MARKING
3-digits marking（±5%
: 1206 & 0805 & 0603
）
Each resistor is marked with a three digits code on the protective coating to designate the nominal resistance
value. For values up to 9.1 the R is used as a decimal point. For values of 10.0 or greater the first 2 digits
apply to the resistance value and third indicate the number of zeros to follow.
4-digits marking（
±1%
: 1206/0805
）
Each resistor is marked with a four digits code on the protective coating to designate the nominal resistance value.
For values of <97.6Ω the R is used as a decimal point. For values of 100Ω or greater the first 3 digits are significant,
the fourth indicates the number of zeros to follow.
Example
RESISTANCE
3-digits marking
4-digits marking
10Ω
100
10R0
12Ω
12R
12R0
100Ω
101
100R
6800Ω
682
6801
47000Ω
473
4702
No marking for 0402 size.
FUNCTIONAL DESCRIPTION
Product characterization
Standard values of nominal resistance are taken from the E96 series for resistors with a tolerance of
±1%,.
The values of the E96 series are in accordance with “IEC publication 60063”
Derating
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
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.
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WR12-08-06-04W
Ver.17
April.-2010
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 .
WR12
Size code
WR12 : 1206
WR08 : 0805
WR06 : 0603
WR04 : 0402
W
Type code
W : F tolerance of
1Ω~9.76Ω,
1.02MΩ~10M
Ω
2R15
Resistance code
E96 : 3 significant digits
followed by no. of zeros
2.15Ω
5.11MΩ
=2R15
=5114
F
Tolerance
F :
±1%
T
Packaging code
T
: 7” Reeled taping
L
Termination code
L
=
Sn base (lead
free)
Q : 10” Reeled taping
G : 13” Reeled taping
B
: Bulk
PACKING QUANTITY
Reel size \
7” reeled
10” reeled
13” reeled
Bulk by polybag
Series
WR12W
WR08W
5,000 pcs
10,000 pcs
20,000 pcs
5,000 pcs
WR06W
WR04W
10,000 pcs
N/a
N/a
10,000 pcs
Page 5 of 7
WR12-08-06-04W
Ver.17
April.-2010
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