Approval sheet
WR10, WR12, WR08, WR06, WR04,
±
1%,
±
5%
General purpose chip resistors
RoHS compliant lead content 100ppm
Size 1210, 1206, 0805, 0603, 0402,
*Contents in this sheet are subject to change without prior notice.
Page 1 of 8
ASC_WR_TR(Pb<100ppm)_V04
Feb.2011
Approval sheet
FEATURE
1. High reliability and stability
2. Reduced size of final equipment
3. Lower assembly costs
4. Higher component and equipment reliability
5. RoHS compliant and Lead free products
APPLICATION
•
•
•
Consumer electrical equipment
Automotive application
EDP, Computer application
Telecom application
•
DESCRIPTION
The
LEAD FREE
resistors are constructed in a high grade ceramic body (aluminum oxide). Internal metal
electrodes are added at each end and connected by a
LEAD FREE
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
) alloy.
For
±
5%, overcoat is BLACK
For
±
1%, overcoat is Water Blue
Fig 1. Consctruction of a Chip-R
Page 2 of 8
ASC_WR_TR(Pb<100ppm)_V04
Feb.2011
Approval sheet
QUICK REFERENCE DATA
Item
Series No.
Size code
Resistance
Range
Resistance
Tolerance
TCR (ppm/°C)
R≥1MΩ
1MΩ＞R＞10Ω
R≤10Ω
Max. dissipation
@ T
amb
=70°C
Max. Operation
Voltage (DC or
RMS)
Max. Overload
Voltage (DC or
RMS)
Climatic
category (IEC
60068)
Note :
1.
2.
3.
4.
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
≤ ±
200
≤ ±
100
-300/+500
≤ ±
200
≤ ±
200
-300/+500
≤ ±
200
≤ ±
100
-300/+500
≤ ±
200
≤ ±
200
-300/+500
≤ ±
200
≤ ±
100
-300/+500
≤ ±
200
≤ ±
200
-300/+500
≤ ±
200
≤ ±
100
-300/+500
≤ ±
200
≤ ±
200
-300/+500
≤ ±
300
≤ ±
200
-300/+500
≤ ±
300
≤ ±
200
-300/+500
General Specification
WR10
1210(3225)
WR12
1206(3216)
WR08
0805(2012)
1Ω ~10MΩ (±5% tolerance),
10Ω ~ 1MΩ (±1% tolerance), Jumper
±1%
E24/E96
WR06
0603(1608)
WR04
0402(1005)
±5%
E24
±1%
E24/E96
±5%
E24
±1%
E96/E24
±5%
E24
±1%
E96/E24
±5%
E24
±1%
E96/E24
±5%
E24
1/3 W
1/4 W
1/8 W
1/10 W
1/16 W
200V
200V
150V
50V
50V
400V
400V
300V
100V
100V
55/155/56
RCWV
=
Rated Power
×
Resistance Value
or Max. RCWV listed above, whichever is lower.
The resistance of Jumper is defined as max. 0.05Ω.
DIMENSIONS
(unit : mm)
WR10
L
W
T
Tb
Tt
3.10
±
0.10
2.60
±
0.10
0.55
±
0.10
0.50
±
0.20
0.50
±
0.20
WR12
3.10
±
0.10
1.60
±
0.10
0.60
±
0.15
0.45
±
0.20
0.50
±
0.20
WR08
2.00
±
0.10
1.25
±
0.10
0.50
±
0.15
0.40
±
0.20
0.40
±
0.20
WR06
1.60
±
0.10
0.80
±
0.10
0.45
±
0.15
0.30
±
0.15
0.30
±
0.10
WR04
1.00
±
0.05
0.50
±
0.05
0.35
±
0.05
0.25
±
0.10
0.20
±
0.10
Page 3 of 8
ASC_WR_TR(Pb<100ppm)_V04
Feb.2011
Approval sheet
MARKING
Size
1210 (3225)
1206 (3216)
0805 (2012)
0603 (1608)
0402(1005)
±
5%
3-digits marking
3-digits marking
3-digits marking
3-digits marking
No marking
±
1%
no marking
no marking
no marking
no marking
3-digits marking（±5%
: 1210 & 1206 & 0805 & 0603
）
For values below 10Ω, the R is used as 2 digit. For example, 9.1ohm = 9R1
For values below 100Ω, the 0 is used as last digit. For example, 91ohm = 910
For values of 100Ω or greater the first 2 digits apply to the resistance value and the third digit indicates the number of
multiple to follow.
nd
Example
RESISTANCE
3-digits marking（1210, 1206 & 0805 & 0603
±
5%
）
（
9.1Ω
9R1
91Ω
910
100Ω
101
6800Ω
682
47000Ω
473
FUNCTIONAL DESCRIPTION
Product characterization
Standard values of nominal resistance are taken from the E24 series for resistors with a tolerance of
±5%,
and E96 series for resistors with a tolerance of
±1%.
The values of the E24/E96 series are in accordance with
“IEC publication 60063”
De-rating
The power that the resistor can dissipate depends on the operating temperature; see Fig.2.1
Figure 2.1 Maximum dissipation in percentage of rated power as a
function of the ambient temperature for WR10X, WR12X
WR08X, WR06X, WR04X
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.
Page 4 of 8
ASC_WR_TR(Pb<100ppm)_V04
Feb.2011
Approval sheet
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
WR10 : 1210
WR12 : 1206
WR08 : 0805
WR06 : 0603
WR04: 0402
X
Type code
X
:
5% : 1Ω~10MΩ
1% : 10Ω~1MΩ
W:
1% : <10Ω; > 1MΩ
472_
Resistance code
5%, E24 : 2 significant digits
followed by no. of zeros
and a blank
4.7Ω
10Ω
220Ω
Jumper
=4R7_
=100_
=221_
=000_
J
Tolerance
F :
±1%
J :
±5%
P : Jumper
T
Packaging code
T
: 7” Reeled taping
R
RoHS code
R = Lead free
(< 100 ppm )
Q : 10” Reeled taping
G : 13” Reeled taping
B
: Bulk
(“_” means a blank)
1%, E24/E96: 3 significant
digits followed by no. of
zeros
102Ω
37.4KΩ
=1020
=3742
LEAD content: below 100ppm with reference to IEC62321, determination of LEAD by ICP-AES
WR10, WR12,WR08,WR06:
1.
2.
Reeled tape packaging : 8mm width paper taping 5000pcs per 7” reel, 10kpcs per 10” reel, 20kpcs per 13” reel.
Bulk packaging
: 5000pcs per poly-bag
WR04:
1.
2.
Reeled tape packaging : 8mm width paper taping 10,000pcs per reel,
Bulk packaging
: 10,000pcs per poly-bag
Page 5 of 8
ASC_WR_TR(Pb<100ppm)_V04
Feb.2011
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