WR20W3742JTR [WALSIN]
Thick Film Power Chip Resistors;型号: | WR20W3742JTR |
厂家: | Walsin Technology |
描述: | Thick Film Power Chip Resistors |
文件: | 总7页 (文件大小:205K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
Approval sheet
WR18X(W), WR20X(W), WR25X(W)
±1%, ±5%
Thick Film Power Chip Resistors
RoHS compliant lead content <100ppm
Size 1218,2010,2512
*Contents in this sheet are subject to change without prior notice.
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WR18-20-25X_TR_V01
Jul- 2014
Approval sheet
FEATURE
1. High power rating and compact size
2. High reliability and stability
3. Reduced size of final equipment
4. RoHS exemption free & Lead free products
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. For all sizes overcoat color is light blue. 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
WR20X(W)
WR18X(W)
1218(3248)
WR25X(W)
2512(6432)
Size code
2010 ( 5025 ),
Resistance Tolerance
Resistance Range
±5% (E24); ±1% (E24+E96)
1Ω ~ 10MΩ, Jumper (0Ω)
± 100 ppm/°C
TCR (ppm/°C) : 10Ω< Rn ≤ 10MΩ
1Ω≤ Rn ≤ 10Ω
± 100 ppm/°C
± 200 ppm/°C
± 100 ppm/°C
± 200 ppm/°C
± 200 ppm/°C
1W
0.5 W
200V
1W
Max. dissipation at Tamb=70°C
Max. Operation Voltage (DC or RMS)
Max. Overload Voltage (DC or RMS)
Climatic category (IEC 60068)
200V
400V
250V
500V
400V
55/155/56
Test conditions for jumper ( 0 ohm )
Type
WR18X(W)
1 W
WR20X(W)
WR25X(W)
1 W
Power Rating At 70C
Resistance
1/2 W
Max. 50mR
3.2 A
Max. 50mR
4.5 A
Max. 50mR
4.5 A
Rated Current
Peak Current
11 A
8 A
11 A
Operating Temperature
-55C ~ 155C
-55C ~ 155C
-55C ~ 155C
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.
MECHANICAL DATA (unit : mm)
TYPE
WR18X(W)
3.05±0.15
4.60±0.20
0.55±0.10
0.45±0.25
0.50±0.25
WR20X(W)
5.00±0.20
2.50±0.20
0.55±0.10
0.65±0.25
0.60±0.25
WR25X(W)
6.40±0.20
3.20±0.20
0.60±0.10
0.65±0.25
0.90±0.25
L
W
T
Tt
Tb
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Jul- 2014
Approval sheet
MARKING
No marking for all sizes!
FUNCTIONAL DESCRIPTION
Product characterization
Standard values of nominal resistance are taken from the E96 & E24 series for resistors with a tolerance of
±5% & ±1%. 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.3
Figure 3. Maximum dissipation in percentage of rated power
as a function of the ambient temperature.
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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Jul- 2014
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. 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 4.
Fig 4. Infrared soldering profile for Chip Resistors
CATALOGUE NUMBERS
The resistors have a catalogue number starting with .
WR20
X
472_
Resistance code
J
T
R
Size code
Type code
X :
Tolerance
J : ±5%
Packaging code
T : 7” Reel taping
(T:1218 10” Reel)
RoHS code
WR25 : 2512
WR20 : 2010
WR18: 1218
5% E24 : 2 significant digits
followed by no. of zeros and
a blank
R = Lead content
< 100ppm
±5%: 1Ω-10MΩ
±1%: 10Ω-1MΩ
W :
F : ±1%
P : Jumper
4.7Ω
10Ω
=4R7_
=100_
1% : <10Ω or
>1MΩ
1% E24+E96: 3 significant digits
followed by no. of zeros
102Ω
=1020
=3742
37.4KΩ
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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.
REQUIREMENT
TEST
PROCEDURE
DC resistance
DC resistance values measured at the test voltages specified below : Within the specified
tolerance
Clause 4.5
<10Ω@0.1V,<100Ω@0.3V, <1KΩ@1.0V, <10KΩ@3V,
<100KΩ@10V, <1MΩ@25V, <10MΩ@30V
Temperature
Natural resistance change per change in degree centigrade.
Refer to
Coefficient of
Resistance(T.C.R)
“QUICK REFERENCE
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
∆R/R max. ±(2%+0.1Ω)
Short time overload
(S.T.O.L) Clause
Clause 4.13
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.
Resistance to
soldering heat(R.S.H)
Clause 4.18
Un-mounted chips completely immersed for 10±1second in a SAC
solder bath at 260℃±5ºC
no visible damage
∆ R/R max. ±(1%+0.05Ω)
Un-mounted chips completely immersed for 2±0.5 second in a SAC good tinning (>95%
Solderability
solder bath at 235℃±5℃
covered)
Clause 4.17
no visible damage
Temperature cycling
30 minutes at -55°C±3°C, 2~3 minutes at 20°C+5°C-1°C, 30 minutes no visible damage
at +155°C±3°C, 2~3 minutes at 20°C+5°C-1°C, total 5 continuous
∆R/R max. ±(1%+0.05Ω)
Clause 4.19
cycles
1000 +48/-0 hours, loaded with RCWV or Vmax in chamber controller
70±2ºC, 1.5 hours on and 0.5 hours off
∆R/R max. ±(3%+0.1Ω)
Load life (endurance)
Clause 4.25
1000 +48/-0 hours, loaded with RCWV or Vmax 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. ±(3%+0.1Ω)
∆R/R max. ±(1%+0.05Ω)
Load life in Humidity
Clause 4.24
Bending strength
Clause 4.33
Adhesion
Resistors mounted on a 90mm glass epoxy resin PCB(FR4);
bending : 2 mm, once for 10 seconds
Pressurizing force: 5N, Test time: 10±1sec.
No remarkable damage or
removal of the terminations
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
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PACKAGING
Plastic Tape specifications (unit :mm)
Type
WR18
WR20
WR25
A
B
W
F
E
4.90±0.20
5.50±0.20
6.90±0.20
3.55±0.30
2.80±0.20
3.60±0.20
12.00±0.30
5.50±0.10
1.75±0.10
Type
WR18
WR20
WR25
P1
P0
T
ΦD
8.00±0.10
1.30±0.20
+0.1
4.00±0.10
Φ1.50
−0.0
4.00±0.10
MAX1.2
Reel dimensions
Symbol
(unit : mm)
A
B
C
D
13.0±0.2
14.0±0.2
Φ178.0±2.0
Φ60.0±1.0
Taping quantity
WR20, WR25 by plastic tape taping 4,000 pcs per reel.
WR18 by plastic tape taping 3,000 pcs per reel
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Jul- 2014
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