Approval sheet
WF06P, WF08P, WF12P, WF20P, WF25P
±
1%,
±
5% 0 , 1 ~1M
Thick film High Power Chip Resistors
Size 0603, 0805, 1206, 2010, 2512
( Automotive & Anti-sulfuration )
*Contents in this sheet are subject to change without prior notice.
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ASC_WFxxP_V_V01
Mar - 2014
Approval sheet
FEATURE
1.
2.
3.
4.
5.
Automotive grade AEC Q-200 compliant
100% CCD inspection
RoHS compliant and Lead free products
High power rating
Anti-sulfuration ASTM B-809-95 compliant
APPLICATION
1.
2.
3.
4.
5.
6.
High accuracy dc-power supply
Digital multi-meter
Telecommunication
Computer
Automotive industry
Medical and military equipment
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
nominated value within tolerance which controlled by laser trimming 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.
Fig 1. Construction of Chip-R
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ASC_WFxxP_V_V01
Mar - 2014
Approval sheet
QUICK REFERENCE DATA
Item
Series No.
Size code
Resistance Tolerance
Resistance Range
TCR (ppm/°C) 20°C ~ +155°C
10.2Ω ~ 1MΩ
1 ~ 10
TCR (ppm/°C) 20°C ~
10.2Ω ~ 1MΩ
1 ~ 10
Max. dissipation at T
amb
=70°C
Max. Operation Voltage (DC or RMS)
Max. Overload Voltage (DC or RMS)
Climatic category (IEC 60068)
Basic specification
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
- 55°C
≤ ±
100
≤ ±
150
1/8 W
50V
100V
≤ ±
100
≤ ±
150
1/4 W
150V
300V
1/2W
200V
400V
55/155/56
JIS C 5201-1:1998 / IEC 60068-2-58:2004
1W
200V
400V
2W
200V
400V
≤ ±
100
≤ ±
100
≤ ±
100
≤ ±
100
≤ ±
100
≤ ±
100
≤ ±
100
WF06P
0603 (1608)
General Specification
WF08P
0805 (2012)
WF12P
1206 (3216)
±1%, ±5%
0 ,1 ~ 1MΩ (E96+E24 series)
WF20P
2010 (5025)
WF25P
2512 (6432)
RCWV
=
Rated Power
×
Resistance Value
or Max. RCWV listed above, whichever is lower.
DIMENSIONS (unit : mm)
Part No
WF06P
1.60
±
0.10
0.80
±
0.10
0.45
±
0.15
0.30
±
0.15
0.30
±
0.10
WF08P
2.00
±
0.10
1.25
±
0.10
0.50
±
0.15
0.40
±
0.20
0.40
±
0.20
WF12P
3.10
±
0.15
1.60
±
0.15
0.55
±
0.10
0.50
±
0.25
0.50
±
0.25
WF20P
5.00
±
0.20
2.50
±
0.20
0.60
±
0.10
0.60
±
0.25
0.60
±
0.25
WF25P
6.30
±
0.20
3.10
±
0.20
0.60
±
0.15
1.80
±
0.25
0.60
±
0.25
L
W
T
Tb
Tt
Page 3 of 8
ASC_WFxxP_V_V01
Mar - 2014
Approval sheet
MARKING
Size \ Nr. Of digit of code\ tolerance
2512 (6432)
2010 (5025)
1206 (3216)
0805 (2012)
0603 (1608)
±
5%
3-digits marking
3-digits marking
3-digits marking
3-digits marking
3-digits marking
±
1%
4-digits marking
4-digits marking
4-digits marking
4-digits marking
3-digits marking
3-digits marking（±5%
: 2512, 2010, 1206, 0805, 0603
）
Each resistor is marked with a three digits code on the protective coating to designate the nominal resistance value.
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
-2
，X=10
-1
，A=10
0
，B=10
1
，C=10
2
，D=10
3
，E=10
4
，F=10
5
EX :
3. Remark
CODE
R_value
CODE
R_value
Description
17.8Ω=25X，178Ω=25A，1K78 =25B
17K8=25C， 178K=25D， 1M78=25E
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%
: 2512/ 2010/ 1206/ 0805
）
Each resistor is marked with a four digits code on the protective coating to designate the nominal resistance value.
Example
RESISTANCE
3-digits marking（1206 & 0805 & 0603
±
5%
）
（
4-digits marking
10Ω
100
10R0
12Ω
120
12R0
100Ω
101
1000
6800Ω
682
6801
47000Ω
473
4702
Page 4 of 8
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Approval sheet
FUNCTIONAL DESCRIPTION
Product characterization
Standard values of nominal resistance are taken from the E96&E24 series for resistors with a tolerance of
±1%,±5%.
The values of the E96/E24 series are in accordance with “IEC publication 60063”.
Derating
The power that the resistor can dissipate depends on the operating temperature; see Fig.2
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 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
Page 5 of 8
ASC_WFxxP_V_V01
Mar - 2014
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