WF25S472_KTL [WALSIN]
Power rating and compact size;
| 型号： | WF25S472_KTL |
| 厂家： | 
Walsin Technology |
| 描述： | Power rating and compact size |
| 文件： | 总7页 (文件大小：237K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
WF25S, WF20S, WF12S, WF08S, WF06S
±5%, ±10%, ±20%
Power Surge Chip Resistors
Size 2512 , 2010 , 1206 , 0805 , 0603
Page 1 of 7
WFxxS_V07
Jan.2011
FEATURE
1. Power rating and compact size
2. High reliability and stability
3. Reduced size of final equipment
4. Surge protection
APPLICATION
•
•
•
•
Power supply
Measurement instrument
Automotive industry
Medical or Military equipment
DESCRIPTION
The resistors are constructed in a high grade ceramic body (aluminum oxide). Internal 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 request resistance to nominal value within tolerance which controlled by printing
process in 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 (Pb free) alloy.
Fig 1. Consctruction of Chip-R
Page 2 of 7
WFxxS_V07
Jan.2011
QUICK REFERENCE DATA
Item
General Specification
WF12S
Series No.
WF25S
WF20S
WF08S
WF06S
Size code
2512(6432 )
2010 (5025)
1206 ( 3216 )
0805 (2012)
0603 (1608)
Resistance Tolerance
Resistance Range
±5% ±10% ±20% (E24)
1Ω ~ 1MΩ
TCR (ppm/°C)
± 100 ppm /°C
Max. dissipation at
Tamb=70°C
1 W
1/2W
200V
400V
1/4W
200V
400V
1/8W
150V
300V
1/10 W
50V
Max. Operation Voltage
(DC or RMS)
200V
400V
Max. Overload Voltage
(DC or RMS)
100V
Climatic category (IEC
60068)
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
or Max. RCWV listed above, whichever is lower.
RCWV = RatedPower ×ResistanceValue
MECHANICAL DATA(unit : mm)
Symbol
WF25S
WF20S
WF12S
WF08S
WF06S
L
W
T
6.30±0.20
3.10±0.20
0.60±0.15
0.60±0.25
0.60±0.25
5.00±0.20
2.50±0.20
0.60±0.10
0.60±0.25
0.60±0.25
3.10±0.15
1.60±0.15
0.55±0.10
0.50±0.25
0.50±0.25
2.00±0.15
1.20±0.15
0.50±0.10
0.40±0.20
0.40±0.20
1.60 ± 0.10
0.80 ± 0.10
0.45 ± 0.15
0.30 ± 0.15
0.30 ± 0.10
Tt
Tb
Page 3 of 7
WFxxS_V07
Jan.2011
MARKING
1. Each resistor is marked with a three-digit code on the protective coating to designate the nominal
resistance value.
2. Surge Resistor is prints underline on three-digit code for identification
Example:
472
472 = 4700Ω
Surge Performance
WFxxS series
10000
1000
Peak power
(Watt)
2512
2010
100
1206
0805
0603
1
0
1
1ms
10ms
100ms
1s
Surge duration
De-rating curve
The power that the resistor can dissipate depends on the operating temperature; see Fig.2
Page 4 of 7
WFxxS_V07
Jan.2011
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 WFxxS
CATALOGUE NUMBERS
The resistors have a catalogue number starting with .
WF20
S
Type code
S : surge
472_
Resistance code
J
T
L
Size code
Tolerance
J: ±5%
Packaging code
T : 7” Reeled taping
Termination code
WF25 : 2512
WF20 : 2010
WF12 : 1206
WF08 : 0805
WF06 : 0603
E24 : 3 significant digits followed
by no. of zeros and a blank
L
= Sn base (lead
free)
K: ±10%
M: ±20%
472 = 4K7
Page 5 of 7
WFxxS_V07
Jan.2011
TEST AND REQUIREMENTS(JIS C 5201-1 : 1998)
TEST
PROCEDURE
REQUIREMENT
Natural resistance change per change in degree centigrade. Refer to “QUICK REFERENCE
Temperature
Coefficient of
Resistance(T.C.R)
DATA”
R2 − R
×106 (ppm/°C) t1 : 20°C+5°C-1°C
1
R
(
t2 − t1
)
1
Clause 4.8
R1 : Resistance at reference temperature
R2 : Resistance at test temperature
Permanent resistance change after a 5second application of
a voltage 2.5 times RCWV or the maximum overload voltage
specified in the above list, whichever is less.
Short time overload
(S.T.O.L)
∆R/R max. ±(1%+0.1Ω)
Clause 4.13
Un-mounted chips completely immersed for 10±1second in a no visible damage
solder bath at 260℃±5ºC
Resistance to
soldering heat(R.S.H)
Clause 4.18
∆ R/R max. ±(1%+0.05Ω)
Un-mounted chips completely immersed for 2±0.5second in good tinning (>95% covered)
Solderability Clause
a solder bath at 235℃±5℃
Clause 4.17
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 cycles
no visible damage
Temperature cycling
Clause 4.19
∆R/R max. ±(1%+0.05Ω)
Load life (endurance)
Clause 4.25
70±2ºC, 1000 hours, loaded with RCWV or Vmax,1.5 hours
on and 0.5 hours off
∆R/R max. ±(3%+0.1Ω)
∆R/R max. ±(3%+0.1Ω)
Load life in Humidity
Clause 4.24
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
Bending strength
Resistors mounted on a 90mm glass epoxy resin PCB(FR4);
bending : 2 mm, once for 10 seconds
∆R/R max. ±(1%+0.05Ω)
Clause 4.33
Adhesion
No remarkable damage or
removal of the terminations
Pressurizing force: 5N, Test time: 10±1sec.
Clause 4.32
Insulation Resistance
R≧10GΩ
Apply the maximum overload voltage (DC) for 1minute
Apply the maximum overload voltage (AC) for 1 minute
Clause 4.6
Dielectric Withstand
No breakdown or flashover
Voltage
Clause 4.7
Page 6 of 7
WFxxS_V07
Jan.2011
PACKAGING
Plastic Tape specifications (unit :mm)
Series No.
WF25S
A
B
W
F
E
6.70±0.20
3.50±0.20
12.00±0.30
5.50±0.05
1.75±0.10
5.50±0.20
3.57±0.20
2.40±0.20
1.90±0.20
2.80±0.20
2.00±0.20
1.65±0.20
1.10±0.20
WF20S
WF12S
WF08S
WF06S
8.00±0.30
3.50±0.05
1.75±0.10
Series No.
WF25S
P1
P0
T
ΦD
Max. 1.2
WF20S
+0.1
−0.0
WF12S
4.00±0.10
4.00±0.10
Φ1.50
Max. 1.0
WF08S
WF06S
0.65±0.05
Reel dimensions
Reel / Tape
A
B
C
D
7” reel for 8mm tape
7” reel for 12mm tape
9.00±0.50
12.4±1.00
13.0±0.2
Φ178.0±2.0
Φ60.0±1.0
Taping quantity
-1206 0805 0603 Chip resistors 5,000 pcs per reel.
-2010 2512 Chip resistors 4,000 pcs per reel.
Page 7 of 7
WFxxS_V07
Jan.2011
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