WF25V [WALSIN]
Special material and design for high working voltage require;
| 型号： | WF25V |
| 厂家： | 
Walsin Technology |
| 描述： | Special material and design for high working voltage require |
| 文件： | 总8页 (文件大小：373K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
WF25V, WF20V, WF12V, WF08V
1%, 5%
Thick Film High Voltage Chip Resistors
Size 2512,2010,1206, 0805
Customer
:
Approval No :
Issue Date :
Customer Approval :
Page 1 of 8
WF25V, WF20V, WF12V, WF08V
Ver.8
Jul. 2010
FEATURE
1. Special material and design for high working voltage require.
2. Compatible with flow and reflow soldering
3. Suitable for lead free soldering.
APPLICATION
Power supply
Automotive industry
Measurement instrument
Back light inverter
Medical or 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. Consctruction of Chip-R
Page 2 of 8
WF25V, WF20V, WF12V, WF08V
Ver.8
Jul. 2010
QUICK REFERENCE DATA
Item
Series No.
General Specification
WF25V
WF 20V
WF12V
WF08V
Size code
2512(6432 )
2010 ( 5025 )
1206 ( 3216 )
0805 ( 2012 )
Resistance Tolerance
Resistance Range
1%,5%
100 K ~10 M
68 K ~10 M
TCR (ppm/C)
100ppm/C
1 W
1/2 W
1/4 W
800V
1/8 W
400V
800V
Max. Dissipation at Tamb=70C
Max. Operation Voltage (DC or RMS)
Max. Overload Voltage (DC or RMS)
Climatic category (IEC 60068)
3000V
4000V
2000V
3000V
1600V
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
RCWV RatedPowerResistance Value or Max. RCWV listed above, whichever is lower.
MECHANICAL DATA
WF25V
WF 20V
WF12V
WF08V
Symbol
L
W
T
6.30 0.20
3.10 0.20
0.60 0.15
0.60 0.25
0.90 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 0.10
1.25 0.10
0.50 0.15
0.40 0.20
0.40 0.20
Tt
Tb
105
Page 3 of 8
WF25V, WF20V, WF12V, WF08V
Ver.8
Jul. 2010
MARKING
For E24 series, Each resistor is marked with a three–digit code on the protective coating to designate the
nominal resistance value. For E96 series, Each resistor is marked with a four–digit code on the protective
coating to designate the nominal resistance value.
Example:
105 = 1M
105
FUNCTIONAL DESCRIPTION
Product characterization
Standard values of nominal resistance are taken from the E24/E96 series for resistors with a tolerance of
1%, 5%. The values of the E24/E96 series are in accordance with “IEC publication 60063”.
Derating curve
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
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 4 of 8
WF25V, WF20V, WF12V, WF08V
Ver.8
Jul. 2010
SOLDERING CONDITION
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
CATALOGUE NUMBERS
The resistors have a catalogue number starting with .
WF25
V
105
J
T
L
Size code
Type code
Resistance code
Tolerance
J : 5%
F : 1%
Packaging code
Termination code
WF25 : 2512
WF20 : 2010
WF12 : 1206
WF08 : 0805
V :High Voltage
T : 7” inch reel
L
= Sn base (lead
5% E24: 2 significant digits
followed by no. of zeros
and a blank
free)
1206:paper tape,
5kpcs/reel
1 M
= 105
2010,2512 :plastic
tape, 4kpcs/reel
1%, E24+E96: 3 significant
digits followed by no. of
zeros
1 M
= 1004
Tape packaging WF12, WF08 : 8mm width paper taping 5,000pcs per reel.
WF25；WF20: 12mm width plastic taping 4,000pcs per reel.
Marking code : For E24 series , 3 digit marking code for J tol.. E96 series, 4 digit marking code for F tol.
Page 5 of 8
WF25V, WF20V, WF12V, WF08V
Ver.8
Jul. 2010
TEST AND REQUIREMENTS(JIS C 5201-1 : 1998)
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
REQUIREMENT
Temperature Coefficient
of Resistance(T.C.R)
Natural resistance change per change in degree centigrade. Refer to
“QUICK REFERENCE DATA”
R2 R
106 (ppm/C)
1
Clause 4.8
R
1t2 t1
R1 : Resistance at reference temperature
R2 : Resistance at test temperature
t1 : 20°C+5°C-1°C
Short time overload
(S.T.O.L)
Permanent resistance change after a 5second application of No visible damage
a voltage 2 times RCWV or the maximum overload voltage
specified in the above list, whichever is less.
R/R max. ±(1%+0.0001)
Clause 4.13
Un-mounted chips completely immersed for 10±1second in a
SAC solder bath at 260℃±5ºC
no visible damage
Resistance to soldering
heat(R.S.H)
R/R max. ±(1%+0.0001)
Clause 4.18
Solderability
Clause 4.17
Un-mounted chips completely immersed for 2±0.5second in
a SAC solder bath at 235℃±5℃
good tinning (>95% covered)
no visible damage
Temperature cycling
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
no visible damage
Clause 4.19
R/R max. ±(1%+0.0001)
Load life (endurance)
1000 +48/-0 hours, loaded with RCWV or Vmax in chamber no visible damage
controller 70±2ºC, 1.5 hours on and 0.5 hours off
Clause 4.25
R/R max. ±(5%+0.0001)
Load life in Humidity
1000 +48/-0 hours, loaded with RCWV or Vmax in humidity no visible damage
chamber controller at 40C2C and 90~95% relative
humidity, 1.5hours on and 0.5 hours off
Clause 4.24
R/R max. (5%+0.0001)
R/R max. ±(1%+0.05)
Resistors mounted on a 90mm glass epoxy resin
PCB(FR4), bending : 1206 3 mm, 2512,2010 2mm once
for 10 seconds
Bending strength
Clause 4.33
Pressurizing force: 5N, Test time: 10±1sec.
Adhesion
No remarkable damage or
removal of the terminations
Clause 4.32
Page 6 of 8
WF25V, WF20V, WF12V, WF08V
Ver.8
Jul. 2010
TEST
PROCEDURE
REQUIREMENT
R≧10GΩ
Insulation Resistance
Apply the maximum overload voltage (DC) for 1minute
Clause 4.6
Dielectric Withstand
Apply the maximum overload voltage (AC) for 1 minute
No breakdown or flashover
Voltage
Clause 4.7
Page 7 of 8
WF25V, WF20V, WF12V, WF08V
Ver.8
Jul. 2010
PACKAGING
Paper Tape specifications (unit :mm)
Series No.
WF25V
A
B
W
F
E
6.90±0.20
3.60±0.20
12.00±0.30
5.50±0.10
1.75±0.10
5.50±0.20
3.60±0.20
2.40±0.20
P1
2.80±0.20
2.00±0.20
1.65±0.20
P0
WF20V
WF12V
8.00±0.30
8.00±0.30
D
3.50±0.20
3.50±0.20
T
1.75±0.10
1.75±0.10
WF08V
Series No.
WF25V
Max. 1.2
Max. 1.0
WF20V
0.1
0.0
4.00±0.10
4.00±0.10
1.50
WF12V
WF08V
Reel dimensions
(unit : mm)
Reel / Tape
A
B
C
D
7” reel for 12mm tape
12.4±1.0
13.0±0.2
178.0±2.0
60.0±1.0
7” reel for 8mm tape
9.0±0.5
Page 8 of 8
WF25V, WF20V, WF12V, WF08V
Ver.8
Jul. 2010
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