Approval sheet
Page 1 of 10 ASC_WR_V24 SEP 2016
WR12, WR08, WR06, WR04
1%, 5%
Thick Film General Purpose Chip Resistors
Size 1206, 0805, 0603, 0402
RoHS 2 compliant & Halogen free
*Contents in this sheet are subject to change without prior notice.
Approval sheet
Page 2 of 10 ASC_WR_V24 SEP 2016
FEATURE
1. High reliability and stability
2. Reduced size of final equipment
3. Lower assembly costs
4. Higher component and equipment reliability
5. RoHS 2 compliant and Halogen free products
APPLICATION
Consumer electrical equipment
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) alloy.
Fig 1. Construction of Chip-R
Approval sheet
Page 3 of 10 ASC_WR_V24 SEP 2016
QUICK REFERENCE DATA
Item
General Specification
Series No.
WR12
WR08
WR06
WR04
Size code
1206(3216)
0805(2012)
0603(1608)
0402(1005)
Resistance Range
1~10M (5% tolerance), Jumper
1~10M (1% tolerance),
Resistance Tolerance
5%
E24
1%
E96/E24
5%
E24
1%
E96/E24
1%
E96/E24
5%
E24
TCR (ppm/C)
10M R＞10
R10
100
-200~+400
Max. dissipation
@ Tamb=70C
1/4 W
1/8 W
1/10 W
1/16 W
Max. Operation
Voltage (DC or RMS)
200V
150V
75V
50V
Max. Overload
Voltage (DC or RMS)
400V
300V
150V
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. The resistance of Jumper is defined <0.05.
DIMENSIONS (unit : mm)
WR12
WR08
WR06
WR04
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 0.15
0.25 0.10
Tt
0.50 0.20
0.40 0.20
0.30 0.10
0.20 0.10
Approval sheet
Page 4 of 10 ASC_WR_V24 SEP 2016
MARKING
Size \ Nr. Of digit of code\tolerance
5%
1%
1206 (3216)
3-digits marking
4-digits marking
0805 (2012)
3-digits marking
4-digits marking
0603 (1608)
3-digits marking
3-digits marking
0402(1005)
N0 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.
3-digits marking（1% : 0603）
Nominal resistance
Description
1.E-24 series
As 0603 WR06X 5%.
2.E-96 series
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=100，B=101，C=102，D=103，E=104，F=105
EX : 17.8Ω=25X，178Ω=25A，1K78 =25B
17K8=25C， 178K=25D， 1M78=25E
3. Remark
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
CODE
R_value
CODE
R_value
01
100
13
133
25
178
37
237
49
316
61
422
73
562
85
750
02
102
14
137
26
182
38
243
50
324
62
432
74
576
86
768
03
105
15
140
27
187
39
249
51
332
63
442
75
590
87
787
04
107
16
143
28
191
40
255
52
340
64
453
76
604
88
806
05
110
17
147
29
196
41
261
53
348
65
464
77
619
89
825
06
113
18
150
30
200
42
267
54
357
66
475
78
634
90
845
07
115
19
154
31
205
43
274
55
365
67
487
79
649
91
866
08
118
20
158
32
210
44
280
56
374
68
499
80
665
92
887
09
121
21
162
33
215
45
287
57
383
69
511
81
681
93
909
10
124
22
165
34
221
46
294
58
392
70
523
82
698
94
931
11
127
23
169
35
226
47
301
59
402
71
536
83
715
95
953
12
130
24
174
36
232
48
309
60
412
72
549
84
732
96
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.
Example
RESISTANCE
10
12
100
6800
47000
3-digits marking（1206 & 0805 & 0603 5% ）
100
120
101
682
473
4-digits marking
10R0
12R0
1000
6801
4702
Approval sheet
Page 5 of 10 ASC_WR_V24 SEP 2016
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 for WR12, WR08,
WR06, WR04
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.
Storage and Handling Conditions:
1. Products are recommended to be used up within two years since operation date as ensured shelf life. Check
solderability in case shelf life extension is needed.
2. To store products with following condition:
Temperature :5 to 40℃
Humidity :20 to 70% relative humidity
3. Caution:
a.Don't store products in a corrosive environment such as sulfide, chloride gas, or acid.
It may cause oxdization of electrode, which easily be resulted in poor soldering
b.To store products on the shelf and avoid exposure to moisture.
c.Don't expose products to excessive shock, vibration, direct sunlight and so on
Approval sheet
Page 6 of 10 ASC_WR_V24 SEP 2016
SOLDERING CONDITION follows J-STD-020D
The robust construction of chip resistors allows them to be completely immersed in a solder bath of 260C 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 235C during 2 seconds. The test condition for no
leaching is 260C 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
X
472_
J
T
L
Size code
WR12 : 1206
WR08 : 0805
WR06 : 0603
WR04: 0402
Type code
X :
Jumper
5%, 1 ~ 10M
1%, 10 ~ 1M
W :
1%, < 10; >1M
Resistance code
5%, E24: 2 significant
digits followed by no. of
zeros and a blank
4.7 =4R7_
10 =100_
220 =221_
Jumper =000_
(“_” means a blank)
1%, E24+E96: 3 significant
digits followed by no. of
zeros
102 =1020
37.4K =3742
Tolerance
F : 1%
J : 5%
P : Jumper
Packaging code
T : 7” Reeled taping
Q : 10” Reeled taping
G : 13” Reeled taping
H : 13'' reel 50Kpcs
only for 0402
B : Bulk
D : 7'' reel 20Kpcs
only for 0402
A : 7" reel 15Kpcs only
for 0402
Termination code
L= Sn base
(lead free)
WR12, WR08, WR06:
1. Reeled tape packaging : 8mm width paper taping 5000pcs per 7” reel, 10kpcs per 10” reel, 20kpcs per 13” reel.
2. Bulk packaging : 5000pcs per poly-bag
Approval sheet
Page 7 of 10 ASC_WR_V24 SEP 2016
WR04:
1. Reeled tape packaging : 8mm width paper taping 10,000pcs per 7” reel, 20,000pcs per 10” reel. 70,000pcs per 13”
reel.
2. Bulk packaging : 10,000pcs per poly-bag
Approval sheet
Page 8 of 10 ASC_WR_V24 SEP 2016
TEST AND REQUIREMENTS
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
Resistor
0
Electrical
Characteristics
JISC5201-1: 1998
Clause 4.8
- DC resistance values measurement
- Temperature Coefficient of Resistance (T.C.R)
Natural resistance change per change in degree centigrade.
6
121
12 10
ttR RR
(ppm/C) t1 : 20°C+5°C-1°C; t2 : -55°C or +155°C
R1 : Resistance at reference temperature (20°C+5°C/-1°C)
R2 : Resistance at test temperature (-55°C or +155°C)
Within the specified tolerance
Refer to “QUICK REFERENCE
DATA”
<50m
Resistance to
soldering heat(R.S.H)
JISC5201-1:1998
Clause 4.18
Un-mounted chips completely immersed for 10±1second in a SAC
solder bath at 260℃±5ºC
5%:R/Rmax.(1%+0.05)
1%:R/Rmax.(0.5%+0.05)
no visible damage
<50m
Solderability
JISC5201-1: 1998
Clause 4.17
Un-mounted chips completely immersed for 2±0.5 second in a SAC
solder bath at 235℃±5℃
95% coverage min., good tinning and no
visible damage
Temperature cycling
JISC5201-1: 1998
Clause 4.19
30 minutes at -55C3C, 2~3 minutes at 20°C+5°C-1°C, 30 minutes at
+155C3C, 2~3 minutes at 20°C+5°C-1°C, total 5 continuous cycles
5%: R/R max. (1%+0.05)
1%:R/Rmax.(0.5%+0.05)
No visible damage
<50m
High Temperature
Exposure
MIL-STD-202
method 108
1000+48/-0 hours; without load in a temperature chamber
controlled 1553C
5%:R/Rmax.(2%+0.1)
1%:R/Rmax.(1%+0.1)
No visible damage
<50m
Bending strength
JISC5201-1: 1998
Clause 4.33
Resistors mounted on a 90mm glass epoxy resin PCB(FR4), bending
once 3mm for 10sec, 5mm for WR04
5%:R/Rmax.(1%+0.05)
1%:R/Rmax.(1%+0.05)
No visual damaged
<50m
Adhesion
JISC5201-1: 1998
Clause 4.32
Pressurizing force: 5N, Test time: 10±1sec.
No remarkable damage or removal of the
terminations
Short Time Overload
(STOL)
JISC5201-1: 1998
Clause 4.13
2.5 times RCWV or max. overload voltage, for 5sec onds
5%: R/R max. (2%+0.05)
1%: R/R max. (1%+0.05)
No visible damage
<50m
Approval sheet
Page 9 of 10 ASC_WR_V24 SEP 2016
TEST
PROCEDURE / TEST METHOD
REQUIREMENT
Resistor
0
Load life in Humidity
JISC5201-1: 1998
Clause 4.24
1000 +48/-0 hours, loaded with RCWV or Vmax in humidity chamber
controller at 40C2C and 90~95% relative humidity, 1.5hours on and
0.5 hours off
5%: R/R max. (2%+0.1)
1%: R/R max. (1%+0.1)
No visible damage
<50m
Load life (endurance)
JISC5201-1: 1998
Clause 4.25
1000 +48/-0 hours, loaded with RCWV or Vmax in chamber controller
70±2ºC, 1.5 hours on and 0.5 hours off
5%: R/R max. (3%+0.1)
1%: R/R max. (1%+0.1)
No visible damage
<50m
Insulation Resistance
JISC5201-1: 1998
Clause 4.6
Apply the maximum overload voltage (DC) for 1minute
R≧10GΩ
Dielectric Withstand
Voltage
JISC5201-1: 1998
Clause 4.7
Apply the maximum overload voltage (AC) for 1 minute
No breakdown or flashover
TEST CONDITION FOR JUMPER (0 )
Item
WR12
WR08
WR06
WR04
Power Rating At 70C
1/4W
1/8W
1/10W
1/16W
Resistance
MAX.50m
Rated Current
2A
1.5A
1A
1A
Peak Current
5A
3.5A
3A
2A
Operating Temperature
-55 ~ +155C
Approval sheet
Page 10 of 10 ASC_WR_V24 SEP 2016
PACKAGING
Paper Tape specifications (unit :mm)
Series No.
A
B
W
F
E
WR12
3.60±0.20
2.00±0.20
8.00±0.30
3.50±0.20
1.75±0.10
WR08
2.40±0.20
1.65±0.20
WR06
1.90±0.20
1.10±0.20
WR04
1.20±0.10
0.70±0.10
Series No.
P1
P0
D
T
WR12 / WR08
4.00±0.10
4.00±0.10
1.0 0.0
50.1
Max. 1.0
WR06
0.65±0.05
WR04
2.00±0.10
0.40±0.05
7” Reel dimensions
Symbol
A
B
C
D
7” reel
178.0±2.0
60.0±1.0
13.0±0.2
9.0±0.5
10” reel
254.0±2.0
100.0±1.0
13.0±0.2
9.0±0.5
13” reel
330.0±2.0
100.0±1.0
13.0±0.2
9.0±0.5