WF25A1001JZL [WALSIN]
Ultra high power rating and compact size;
| 型号： | WF25A1001JZL |
| 厂家： | 
Walsin Technology |
| 描述： | Ultra high power rating and compact size |
| 文件： | 总7页 (文件大小：388K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Approval sheet
WF25A
1%, 5%, 3W
Thick Film High Power Chip Resistors
Size 2512 (6432)
RoHS Compliant & Halogen free
*Contents in this sheet are subject to change without prior notice.
Page 1 of 7
ASC_WF25A_V02
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Approval sheet
FEATURE
1. Ultra high power rating and compact size
2. High reliability and stability
3. Reduced size of final equipment
4. RoHS compliant and Halogen free
APPLICATION
Power supply
PDA
Digital meter
Computer
Automotives
Battery charger
DC-DC power converter
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 Tin (lead free) alloy.
Fig 1. Construction of Chip-R
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Approval sheet
QUICK REFERENCE DATA
Item
Series No.
General Specification
WF25A
Size code
2512 ( 6432 )
Resistance Tolerance & Range
5%: 1 - 1M ( E24 ), Jumper
1%: 1 - 1M ( E24+E96 )
TCR (ppm/C) +25 ~ +155C
5%: ±200 ppm/C
1%: ±100 ppm/C
3 W
Max. dissipation at Tamb=70C
Operation temperature
-55 ~ +155’C
Note: Jumper is defined as max. 20mohm with rated current 12A!
MECHANICAL DATA
Symbol
Dimensions (mm)
L
W
T
6.400.20
3.100.20
1.100.20
0.450.25
1.800.25
1001
Tt
Tb
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Approval sheet
MARKING
For 1%, each resistor is marked with a four-digit code on the protective coating to designate the
nominal resistance value.
For 5%, each resistor is marked with a three-digit code on the protective coating to designate the
nominal resistance value.
For Jumper, it is marked with a four-digit code 0000.
FUNCTIONAL DESCRIPTION
Derating curve
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.
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Approval sheet
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 for Chip Resistors WF25A
CATALOGUE NUMBERS
The resistors have a catalogue number starting with .
L
WF25
A
Type code
A : 3W
1001
F
Z
Size code
WF25 : 2512
Resistance code
Tolerance
Packaging code
Termination code
Z : 7” reel taped
L
= Sn base (lead
5%, two digits followed by 3 J : 5%
3,000pcs!
free)
significant digit
F : 1%
100
= 101
P : Jumper
Jumper = 000
1%, three digits followed by
4 significant digit
100
= 1000
Reeled tape packaging
: 12mm width plastic emboss taping 3,000pcs per 7” reel.
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Approval sheet
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
R
1t2 t1
106 (ppm/C) t1 : 25°C
1
Clause 4.8
R1 : Resistance at reference temperature 25°C
R2 : Resistance at test temperature 155°C
J: R/R max. ±(2%+0.5m)
F: R/R max. ±(1%+0.5m)
Short time overload
(S.T.O.L)
Permanent resistance change after a 5second application of a 5 times
rated power.
Clause 4.13
Solderability
Un-mounted chips completely immersed for 3±0.5 second in a SAC good tinning (>95% covered)
solder bath at 245℃±2℃
no visible damage
Clause 4.17
Resistance to soldering
heat(R.S.H)
Un-mounted chips completely immersed for 10±1 second in a SAC
solder bath at 260℃±5ºC
no visible damage
J: R/R max. ±(1%+0.5m)
F: R/R max. ±(0.5%+0.5m)
Clause 4.18
Temperature cycling
30 minutes at -55C3C, 2~3 minutes at 20°C+5°C-1°C, 30 minutes at no visible damage
+155C3C, 2~3 minutes at 20°C+5°C-1°C, total 5 continuous cycles
J: R/R max. ±(1%+0.5m)
F: R/R max. ±(0.5%+0.5m)
J: R/R max. ±(3%+0.5m)
F: R/R max. ±(1%+0.5m)
J: R/R max. ±(3%+0.5m)
F: R/R max. ±(1%+0.5m)
Clause 4.19
1000 +48/-0 hours, loaded with RCWV or Vmax in chamber controller
70±2ºC, 1.5 hours on and 0.5 hours off
Load life (endurance)
Clause 4.25
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
Load life in Humidity
Clause 4.24
Bending strength
Resistors mounted on a 90mm glass epoxy resin PCB(FR4); bending : no visible damage
2mm once for 10 seconds
J: R/R max. ±(1%+0.5m)
F: R/R max. ±(0.5%+0.5m)
Min 1000Mohm
Clause 4.33
Insulation Resistance
Test voltage 100+/-15V between termination and overcoat
Clause 4.6
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Approval sheet
PACKAGING
Plastic Tape specifications (unit: mm)
TYPE
A
B
W
F
E
6.70±0.20
3.50±0.20
12.00±0.30
5.50±0.1
1.75±0.10
WF25A
TYPE
P1
P0
T
D
0.1
0.0
4.00±0.10
4.00±0.10
WF25A
Max. 1.5
1.50
Reel dimensions
Symbol
(unit : mm)
A
B
C
D
13.0±0.2
14.0±0.2
178.0±2.0
60.0±1.0
Taping quantity
- Chip resistors 3,000 pcs per reel.
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