概述
数据手册WF08B3742DTL 概述
High Precision Thin Film Chip Resistors
WF08B3742DTL 数据手册
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PDF下载Approval Sheet
WF25B,WF20B,WF10B,WF12B,WF08B,
WF06B,WF04B
±1%, ±0.5%, ±0.25%, ±0.1%, ±0.05%, ±0.01%
TCR3
High Precision Thin Film Chip Resistors
Size 2512, 2010, 1210, 1206, 0805, 0603,
0402
*Contents in this sheet are subject to change without prior notice.
Page 1 of 10
ASC_WFxxB
MAR 2018
Approval Sheet
FEATURE
1. SMD metal film resistor
2. High reliability and stability of 0.25% and below per customer request
3. High performance of TCR: 3 ppm/K and below per customer request
4. Low current noise
5. RoHS compliant and lead free
APPLICATION
•
•
•
•
•
Medical equipment
Measuring instrument
Communication device
Computer
Printer
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 layer that is applied to the top surface of the substrate. The
composition of the resistive layer 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
environmental soldering issue, the outer layer of these end terminations is a Lead-free solder .
Fig 1. Construction of Chip-R WFxxB
Page 2 of 10
ASC_WFxxB
MAR 2018
Approval Sheet
QUICK REFERENCE DATA
Item
General Specification
Series No.
Size Code
WF25B
2512
WF20B
2010
WF10B
WF12B
1206
WF08B
WF06B
0603
WF04B
0402
1210
0805
(6432)
(5025)
(3225)
(3216)
(2012)
(1608)
(1005)
Resistance
Tolerance
±1.0%, ±0.5%, ±0.25%, ±0.1%, ±0.05%, ±0.02%,±0.01%
Resistance Range
4.7Ω ~
600KΩ
4.7Ω ~
360KΩ
4.7Ω ~
150KΩ
4.7Ω ~
120KΩ
4.7Ω ~
80KΩ
4.7Ω ~
40KΩ
10Ω ~
8KΩ
TCR
±3 ppm/°C
Max. Dissipation at
1W
3/4W
200V
400V
2/5W
200V
400V
1/4W
1/8W
150V
300V
1/10W
75V
1/10W
50V
Tamb=70°C
Max. Operation
Voltage
200V
400V
200V
400V
Max. Overload
Voltage
150V
100V
Operating
- 55~ +155’C
Temperature
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
RCWV = RatedPower ×Resistance Value or Max. RCWV listed above, whichever is lower.
3. Tolerance ±0.01% is upon requested
DIMENSIONS:(unit:mm)
WF25B
WF20B
WF10B
WF12B
WF08B
WF06B
WF04B
Type
6.35 ± 0.10
3.20 ± 0.15
0.60 ± 0.20
0.90 ± 0.25
0.55 ± 0.10
5.00 ± 0.10
2.50 ± 0.15
0.60 ± 0.20
0.60 ± 0.25
0.55 ± 0.10
3.10 ± 0.10
2.60 ± 0.15
0.50 ± 0.20
0.50 ± 0.20
0.55 ± 0.10
3.05 ± 0.15
1.55 ± 0.15
0.40 ± 0.20
0.40 ± 0.20
0.55 ± 0.15
2.00 ± 0.10
1.25 ± 0.10
0.25 ± 0.20
0.40 ± 0.20
0.50 ± 0.15
1.55 ± 0.10
0.80 ± 0.10
0.25 ± 0.15
0.30 ± 0.15
0.45 ± 0.15
1.00 ± 0.10
0.50 ± 0.05
0.30 ± 0.15
0.30 ± 0.15
0.35 ± 0.05
L
W
A
B
t
Protective coat
End termination
t
B
Resistive layer
A
Ceramic Substrate
1001
W
L
Page 3 of 10
ASC_WFxxB
MAR 2018
Approval Sheet
MARKING
ò
3-digits marking for 0603 size
WFxxB has same marking rule as WRxx ±1%.
Nominal resistance
Description
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=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
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
ò
4-digits marking for 2512, 2010, 1210, 1206, 0805 size
For E24+E96, each resistor is marked with a four digits code on the protective coating to designate the
nominal resistance value. For values below 97Ω6 the R is used as a digit. For values of 100Ω or greater, the
first 3 digits are significant, the fourth digit indicates the number of multiple to follow.
Example
RESISTANCE
100Ω
6800Ω
47000Ω
1000
6801
4702
4-digits marking
ò
No marking code for 0402 size
FUNCTIONAL DESCRIPTION
Product characterization
Standard values of nominal resistance are taken from the E192 & E24 series for resistors with a tolerance of
±1.0%, ±0.5%, ±0.25%, ±0.1%. The values of the E24/E192 series are in accordance with “IEC publication
60063”.
Page 4 of 10
ASC_WFxxB
MAR 2018
Approval Sheet
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.
Page 5 of 10
ASC_WFxxB
MAR 2018
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 within lead-free solder bath. The
test condition for no leaching is 260°C for 30 seconds. Typical examples of soldering profile and condition that
provide reliable joints without any damage are given in Fig 3. and Table 1.
Fig. 3 Infrared soldering profile for Chip Resistors
Table 1. Infrared soldering condition for Chip Resistors
Temperature Condition
Average ramp-up rate (217°C to 260°C)
Between 150 and 200°C
> 217°C
Exposure Time
Less than 3°C/second
Between 60-120 seconds
Between 60-150 seconds
260ºC +0/-5°C
Peak Temperature
Min. 30 seconds
Time within 245°C
Ramp-down rate (Peak to 217°C)
Time from 25°C to Peak
Less than 6°C/second
No greater than 480 seconds
Page 6 of 10
ASC_WFxxB
MAR 2018
Approval Sheet
CATALOGUE NUMBERS
The resistors have a catalogue number starting with .
WF06
B
xxxx
B
T
L
Size code
Type code
B : 3 ppm
Resistance code
E192+E24:
Tolerance
T : ±0.01%
U: ±0.02%
A : ±0.05%
B : ±0.10%
C : ±0.25%
D : ±0.50%
F : ±1.00%
Packaging code
T : Taped & Reel
Termination code
L : lead free
WF25: 2512
WF20: 2010
WF10: 1210
WF12: 1206
WF08: 0805
WF06: 0603
WF04: 0402
R is first code followed by
3 significant digits.
100Ω
=1000
37.4KΩ =3742
1. Reeled tape packaging: 8mm width paper taping.
5,000pcs/reel for WF10, WF12, WF08, WF06;
10,000pcs/reel for WF04.
2. Reeled tape packaging: 12mm width paper taping
4,000pcs/reel for WF25, WF20
Page 7 of 10
ASC_WFxxB
MAR 2018
Approval Sheet
TEST AND REQUIREMENTS(JIS C 5201-1 : 1998)
REQUIREMENT
TEST
PROCEDURE
Resistor
DC resistance
DC resistance values measured
Within the specified tolerance
Clause 4.5
Temperature
Coefficient of
Resistance(T.C.R)
Natural resistance change per change in degree Refer to
centigrade.
“ QUICK REFERENCE DATA “
R2 − R
×106 (ppm/°C)
1
Clause 4.8
R
(
t2 − t1
)
1
R1 : Resistance at reference temperature
R2 : Resistance at test temperature
t1 : 20°C+5°C-1°C
t2 : 125°C+5°C-1°C
Short time overload
(S.T.O.L)
Permanent resistance change after
a
5second
∆R/R max. ±(0.1%+0.05Ω)
application of a voltage 2.5 times RCWV or the
maximum overload voltage specified in the above list,
whichever is less.
Clause 4.13
Resistance to soldering
heat(R.S.H)
IEC 60068-2-58:2004
Un-mounted
10±1second in a SAC solder bath at 260℃±5ºC
chips
completely
immersed
for no visible damage
∆ R/R max. ±(0.1%+0.05Ω)
Solderability
Un-mounted chips completely immersed for 2±0.5 good tinning (>95% covered)
second in a SAC solder bath at 235℃±5℃
IEC 60068-2-58:2004
no visible damage
Temperature cycling
no visible damage
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
Clause 4.19
∆R/R max. ±(0.25%+0.05Ω)
Load Life (Endurance)
70±2ºC, 1000 hours, loaded with RCWV or Vmax,1.5
∆R/R max. ±(0.25%+0.05Ω)
hours on and 0.5 hours off
Clause 4.25
Humidity
1000 hours, at rated continuous working voltage in
humidity chamber controller at 40°C±2°C and 90~95%
relative humidity, 1.5hours on and 0.5 hours off
∆R/R max. ±(0.25%+0.05Ω)
Clause 4.24
Bending strength
Resistors mounted on a 90mm glass epoxy resin
PCB(FR4); bending : 3 mm, once for 10 seconds.
∆R/R max. ±(0.1%+0.05Ω)
Clause 4.33
Adhesion
Pressurizing force: 5N, Test time: 10±1sec.
No remarkable damage or removal of the
terminations.
Clause 4.32
Page 8 of 10
ASC_WFxxB
MAR 2018
Approval Sheet
PACKAGING
Paper Tape specifications (unit :mm)
Series No.
WF25
WF20
WF10
WF12
WF08
WF06
WF04
Tape
Plastic
Plastic
Paper
Paper
Paper
Paper
Paper
A
B
W
F
E
6.90±0.20
5.50±0.20
3.60±0.20
3.60±0.20
2.40±0.20
1.90±0.20
1.20±0.10
3.60±0.20
2.80±0.20
3.00±0.20
2.00±0.20
1.65±0.20
1.10±0.20
0.7±0.10
12.00±0.30
12.00±0.30
8.00±0.30
8.00±0.30
8.00±0.30
8.00±0.30
8.00±0.30
5.50±0.10
5.50±0.10
3.50±0.20
3.50±0.20
3.50±0.20
3.50±0.20
3.50±0.05
1.75±0.10
1.75±0.10
1.75±0.10
1.75±0.10
1.75±0.10
1.75±0.10
1.75±0.10
Series No.
WF25
P1
P0
T
ΦD
+0.1
−0.0
4.00±0.10
4.00±0.10
4.00±0.10
4.00±0.10
4.00±0.10
4.00±0.10
2.00±0.10
4.00±0.10
4.00±0.10
4.00±0.10
4.00±0.10
4.00±0.10
4.00±0.10
4.00±0.10
Max 1.2
Max 1.2
Max. 1.0
Max. 1.0
Max. 1.0
Φ1.50
+0.1
−0.0
WF20
WF10
WF12
WF08
WF06
WF04
Φ1.50
Φ1.50
Φ1.50
Φ1.50
Φ1.50
Φ1.50
+0.1
−0.0
+0.1
−0.0
+0.1
−0.0
+0.1
−0.0
0.65±0.05
0.40±0.05
+0.1
−0.0
Page 9 of 10
ASC_WFxxB
MAR 2018
Approval Sheet
Reel dimensions
B
A
C
D
WF25B , WF20B
Symbol
(unit : mm)
A
B
C
D
13.0±0.2
9.0±0.5
Φ178.0±2.0
Φ60.0±1.0
WF12B , WF10B , WF08B , WF06B , WF04B
Symbol
A
B
C
D
(unit : mm)
13.0±0.2
9.0±0.5
Φ178.0±2.0
Φ60.0±1.0
Taping quantity
-
-
-
Chip resistors 4,000 pcs per reel ( WF25B, WF20B )
Chip resistors 5,000 pcs per reel ( WF10B, WF12B, WF08B, WF06B )
Chip resistors 10,000 pcs per reel ( WF04B )
Page 10 of 10
ASC_WFxxB
MAR 2018
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