Walsin Technology Corporation
WR12X / WR08X / WR06X
±1%, ±5%
General purpose chip resistors
Size 1206 / 0805 / 0603
Customer
:
Approval No :
Issue Date
:
Customer Approval :
Page 1 of 8
WR12X / WR08X / WR06X
Version 19
Nov.-2006
Walsin Technology Corporation
FEATURE
1. High reliability and stability
2. Reduced size of final equipment
3. Lower assembly costs
4. Higher component and equipment reliability
5. Lead free products 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 Lead-tin or Tin (lead free) alloy.
Fig 1. Consctruction of a Chip-R
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WR12X / WR08X / WR06X
Version 19
Nov.-2006
Walsin Technology Corporation
QUICK REFERENCE DATA
Item
Series No.
Size code
Resistance Range
Resistance Tolerance
±1%
E96/E24
TCR (ppm/°C)
R≥1MΩ
1MΩ＞R＞10Ω
≤ ±
100
≤ ±
200
≤ ±
200
≤ ±
100
≤ ±
200
≤ ±
200
≤ ±
100
≤ ±
200
≤ ±
200
General Specification
WR12
1206(3216)
WR08
0805(2012)
WR06
0603(1608)
1Ω~10MΩ(±5% tolerance),10Ω~1MΩ(±1% tolerance), Jumper
±5%
E24
±1%
E96/E24
±5%
E24
±1%
E96/E24
±5%
E24
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.
-300~+500
-300~+500
-300~+500
-300~+500
-300~+500
-300~+500
1/4 W
1/8 W
1/10 W
200V
400V
150V
300V
55/155/56
50V
100V
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.
The resistance range 1~10Ω and 1M ~10MΩ with 1% tolerance please refer to WR12W / WR08W / WR06W
series.
The resistance of Jumper is defined <0.05Ω.
4.
DIMENSIONS
WR12X
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
WR08X
2.00
±
0.10
1.25
±
0.10
0.50
±
0.15
0.40
±
0.20
0.40
±
0.20
WR06X
1.60
±
0.10
0.80
±
0.10
0.45
±
0.15
0.30
±
0.15
0.30
±
0.10
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WR12X / WR08X / WR06X
Version 19
Nov.-2006
Walsin Technology Corporation
MARKING
Size \ Nr. Of digit of code\tolerance
1206 (3216)
0805 (2012)
0603 (1608)
±5%
3-digits marking
3-digits marking
3-digits marking
±1%
4-digits marking
4-digits marking
3-digits 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 91Ω the R is used as a decimal point. For values of 100Ω or greater the first 3 digits apply to the resistance
value and fourth indicate the number of zeros to follow.(EX.
Jumper(0Ω) can be 0 or 000)
3-digits marking（±1%
: 0603）
Nominal resistance
1.E-24 series
2.E-96 series
As
0603 WR06X
±5%.
The 1st two digit codes are referring to the CODE on the table, the 3rd code is the index of resistance
value :
Y=10
，X=10 ，A=10 ，B=10 ，C=10 ，D=10 ，E=10 ，F=10
EX :
-2
-1
0
1
2
3
4
5
Description
17.8Ω=25X，178Ω=25A，1K78 =25B
17K8=25C， 178K=25D， 1M78=25E
3. Remark
CODE
R_value
CODE
R_value
There is no marking for the items are not under E-24 and E-96 series
CODE R_Value CODE
R_value
CODE
R_value
CODE
R_value
CODE
R_value
CODE
R_value
01
02
03
04
05
06
07
08
09
10
11
12
100
102
105
107
110
113
115
118
121
124
127
130
13
14
15
16
17
18
19
20
21
22
23
24
133
137
140
143
147
150
154
158
162
165
169
174
25
26
27
28
29
30
31
32
33
34
35
36
178
182
187
191
196
200
205
210
215
221
226
232
37
38
39
40
41
42
43
44
45
46
47
48
237
243
249
255
261
267
274
280
287
294
301
309
49
50
51
52
53
54
55
56
57
58
59
60
316
324
332
340
348
357
365
374
383
392
402
412
61
62
63
64
65
66
67
68
69
70
71
72
422
432
442
453
464
475
487
499
511
523
536
549
73
74
75
76
77
78
79
80
81
82
83
84
562
576
590
604
619
634
649
665
681
698
715
732
85
86
87
88
89
90
91
92
93
94
95
96
750
768
787
806
825
845
866
887
909
931
953
976
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（1206 & 0805 & 0603
±5%
）
4-digits marking
10Ω
100
10R0
12Ω
120
12R0
100Ω
101
1000
6800Ω
682
6801
0Ω
0 or 000
----
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WR12X / WR08X / WR06X
Version 19
Nov.-2006
Walsin Technology Corporation
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”
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.
SOLDERING CONDITION
The robust construction of chip resistors allows
them to be completely immersed in a solder bath
of 260°C for one minute. 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 60
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
Page 5 of 8
WR12X / WR08X / WR06X
Version 19
Nov.-2006
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