Walsin Technology Corporation
Page 1 of 7 WR12-08-06-04W Ver.16 Dec.-2009
WR12W / WR08W / WR06W / WR04W
±
±±
±1% (1Ω
ΩΩ
Ω~9.76Ω
ΩΩ
Ω, 1.02MΩ
ΩΩ
Ω~10MΩ
ΩΩ
Ω)
General purpose chip resistors
Size 1206 / 0805 / 0603 / 0402
Customer :
Approval No :
Issue Date :
Customer Approval :
Walsin Technology Corporation
Page 2 of 7 WR12-08-06-04W Ver.16 Dec.-2009
FEATURE
1. High reliability and stability
2. Reduced size of final equipment
3. Lower assembly costs
4. Higher component and equipment reliability
5. Lead (Pb) free product upon customer requested.
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 a Tin (lead free) solder alloy.
Fig 1. Consctruction of a Chip-R
Walsin Technology Corporation
Page 3 of 7 WR12-08-06-04W Ver.16 Dec.-2009
QUICK REFERENCE DATA
Item General Specification
Series No. WR12W WR08W WR06W WR04W
Size code 1206 (3216) 0805 (2012) 0603 (1608) 0402 (1005)
Resistance Tolerance ±1% (E96 series)
Resistance Range 1Ω ~ 9.76Ω, 1.02MΩ ~ 10MΩ
TCR (ppm/°C)
≤ ± 200 ppm/°C
Max. dissipation at T
amb
=70°C 1/4 W 1/8 W 1/10 W 1/16 W
Max. Operation Voltage (DC or RMS) 200V 150V 50V 50V
Max. Overload Voltage (DC or RMS) 400V 300V 100V 100V
Climatic category 55/155/56
Note :
1. This is the maximum voltage that may be continuously supplied to the resistor element, see “IEC publication
60115-8”
2. Max. Operation Voltage : So called RCWV (Rated Continuous Working Voltage) is determined by
ValueResistancePower RatedRCWV ×= or Max. RCWV listed above, whichever is lower.
3. Lead free terminations upon customer requested.
Dimensions
(unit : mm)
WR12W WR08W WR06W WR04W
L
3.10 ± 0.10
2.00 ± 0.10
1.60 ± 0.10
1.00 ± 0.05
W
1.60 ± 0.10
1.25 ± 0.10
0.80 ± 0.10
0.50 ± 0.05
T
0.60 ± 0.15
0.50 ± 0.15
0.45 ± 0.15
0.35 ± 0.05
Tb
0.45 ± 0.20
0.40 ± 0.20
0.30 ± 0.20
0.25 ± 0.10
Tt
0.50 ± 0.20
0.40 ± 0.20
0.30 ± 0.10
0.20 ± 0.10
Walsin Technology Corporation
Page 4 of 7 WR12-08-06-04W Ver.16 Dec.-2009
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
10Ω 12Ω 100Ω 6800Ω 47000Ω
3-digits marking
100
12R
101
682
473
4-digits marking
10R0 12R0 100R 6801 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.
Walsin Technology Corporation
Page 5 of 7 WR12-08-06-04W Ver.16 Dec.-2009
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 245°C during 3 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 W 2R15 F T L
Size code
WR12 : 1206
WR08 : 0805
WR06 : 0603
WR04 : 0402
Type code
W : F tolerance of
1Ω~9.76Ω,
1.02MΩ~10M
Ω
Resistance code
E96 : 3 significant digits
followed by no. of zeros
2.15Ω =2R15
5.11MΩ =5114
Tolerance
F : ±1%
Packaging code
T : 7” Reeled taping
Q : 10” Reeled taping
G : 13” Reeled taping
B : Bulk
Termination code
L = Sn base (lead
free)
PACKING QUANTITY
Reel size \ Series WR12W WR08W WR06W WR04W
7” reeled 5,000 pcs 10,000 pcs
10” reeled 10,000 pcs N/a
13” reeled 20,000 pcs N/a
Bulk by polybag 5,000 pcs 10,000 pcs
Walsin Technology Corporation
Page 6 of 7 WR12-08-06-04W Ver.16 Dec.-2009
TEST AND REQUIREMENTS(JIS C 5201-1 : 1998)
Essentially all tests are carried out according to the schedule of IEC publication 115-8, category
LCT/UCT/56(rated temperature range : Lower Category Temperature, Upper Category Temperature; damp
heat, long term, 56 days). The testing also meets the requirements specified by EIA, EIAJ and JIS.
The tests are carried out in accordance with IEC publication 68, "Recommended basic climatic and mechanical
robustness testing procedure for electronic components" and under standard atmospheric conditions according
to IEC 60068-1, subclause 5.3. Unless otherwise specified, the following value supplied :
Temperature: 15°C to 35°C, Relative humidity: 45% to 75%.
Air pressure: 86kPa to 106 kPa (860 mbar to 1060 mbar).
All soldering tests are performed with midly activated flux.
TEST PROCEDURE / TEST METHOD REQUIREMENT
DC resistance
Clause 4.5
JIS C 5202 5.1 / IEC 60115-1 4.5
DC resistance values measured at the test voltages specified below :
<10Ω@0.1V,<100Ω@0.3V,<1KΩ@1.0V,<10KΩ@3V,<100KΩ@10V,
<1MΩ@25V, <10MΩ@30V
Within the specified tolerance
Temperature Coefficient
of Resistance(T.C.R)
Clause 4.8
Natural resistance change per change in degree centigrade.
( )
6
121
12 10×
−
−
ttR RR
(ppm/°C) t
1
: 20°C+5°C-1°C
R
1
: Resistance at reference temperature
R
2
: Resistance at test temperature
Refer to
“QUICK REFERENCE DATA”
Short time overload
(S.T.O.L)
Clause 4.13
Permanent resistance change after a 5sec application of a voltage
2.5xU
R
or max. overload voltage, whichever is less.
∆R/R max. ±(2%+0.10Ω)
Resistance to soldering
heat(R.S.H)
IEC 60068-2-58:2004
Un-mounted chips completely immersed for 10
±
1second in a SAC solder
bath at 255
℃±
5
º
C
Δ
R/R max.
±
(1%+0.05
Ω
)
no visible damage
Solderability
IEC 60068-2-58:2004
Un-mounted chips completely immersed for 3±0.3 second in a SAC
solder bath at 245
℃
±5
℃
95% coverage min., good tinning and
no visible damage
Temperature cycling
Clause 4.19
30 minutes at -55°C±3°C, 2~3 minutes at 20°C+5°C-1°C, 30 minutes at
+155°C±3°C, 2~3 minutes at 20°C+5°C-1°C, total 5 continuous cycles
∆R/R max. ±(1%+0.05Ω)
Damp heat (Humidity
loaded in steady state)
Clause 4.24
1000 +48/-0 hours, loaded with RCWV or Vmax in humidity chamber
controller at 40°C±2°C and 90~95% relative humidity, 1.5hours on and
0.5 hours off
10Ω≤R : ∆R/R max. ±(3%+0.10Ω)
R<10Ω, R≥1MΩ :
∆R/R max. ±(5%+0.10Ω)
Load Life (Endurance)
Clause 4.25
1000+48/-0 hours; loaded with RCWV or V
max
in chamber controller
70
±
2
º
C, 1.5 hours on and 0.5 hours off
Ditto
Bending strength
Clause 4.33
Resistors mounted on a 90mm glass epoxy resin PCB(FR4), bending
once for 10sec : 3mm (only 0402: 5mm)
No visual damaged,
∆R/R max. ±(1%+0.05Ω)
Adhesion
Clause 4.32
Pressurizing force: 5N, Test time: 10
±
1sec. No remarkable damage or removal of
the terminations
Insulation Resistance
JISC5201-1:1998
Clause 4.6
Apply the maximum overload voltage (DC) for 1minute R
≧
10G
Ω
Dielectric Withstand
Voltage
JISC5201-1:1998
Clause 4.7
Apply the maximum overload voltage (AC) for 1 minute No breakdown or flashover
Walsin Technology Corporation
Page 7 of 7 WR12-08-06-04W Ver.16 Dec.-2009
PACKAGING
Paper Tape specifications (unit :mm)
Series No. A B W F E
WR12W 3.60
±
0.20 2.00
±
0.20
WR08W 2.40
±
0.20 1.65
±
0.20
WR06W 1.90
±
0.20 1.10
±
0.20
3.50
±
0.20
WR04W 1.20
±
0.10 0.70
±
0.10
8.00
±
0.30
3.50
±
0.05
1.75
±
0.10
Series No. P1 P0 ΦD T
WR12W / WR08W Max. 1.0
WR06W 4.00
±
0.10 0.65
±
0.05
WR04W 2.00
±
0.10
4.00
±
0.10
1.0 0.0
50.1
+
−
Φ
0.40
±
0.05
7” Reel dimensions
Symbol A B C D
(unit : mm) Φ178.0
±
2.0 Φ60.0
±
1.0 13.0
±
0.2 10.0
±
1.5
