Approval sheet
Page 1 of 7 ASC_WR02X_V15 Jan. - 2013
WR02X(W)
±
±±
±5%, ±
±±
±1%
Thick Film General purpose chip resistors
Size 0201
*Contents in this sheet are subject to change without prior notice.
Approval sheet
Page 2 of 7 ASC_WR02X_V15 Jan. - 2013
FEATURE
1. Small size and light weight
2. High reliability and stability
3. Reduced size of final equipment
4. Suitable for high density print circuit board assembly
5. Higher component and equipment reliability
6. Lead free product
APPLICATION
• Mobile phone
• PDA
• Camcorders
• Palmtop computers
• Hybrid module
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 pure Tin.
Fig 1. Construction of Chip-R WR02X
Approval sheet
Page 3 of 7 ASC_WR02X_V15 Jan. - 2013
QUICK REFERENCE DATA
Item General Specification
Series No. WR02X(W)
Size code 0201(0603)
Resistance Range 1Ω~10MΩ ( ±5% tolerance ), Jumper
1Ω~3.3MΩ ( ±1% tolerance )
Resistance Tolerance ±1%
E96/E24
±5%
E24
TCR (ppm/°C)
10Ω - 10MΩ, ≤±200
1 -
9.76Ω, +600~-200
Max. dissipation @ T
amb
=70°C 1/20 W
Max. Operation Voltage (DC or RMS)
25V
Max. Overload Voltage (DC or RMS) 50V
Climatic category
(IEC 60068) 55/125/56
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
ValueResistancePower RatedRCWV ×=
or Max. RCWV listed above, whichever is lower.
DIMENSION(unit : mm)
WR02X(W)
L 0.60 ± 0.03
W 0.30 ± 0.03
T 0.23 ± 0.03
Tb 0.15 ± 0.05
Tt 0.10 ± 0.05
MARKING
WR02X(W) has no marking.
Protective coat
Resistive layer
End termination
Ceramic Substrate
T
Tb
Tt
T
W
L
Approval sheet
Page 4 of 7 ASC_WR02X_V15 Jan. - 2013
FUNCTIONAL DESCRIPTION
Product characterization
Standard values of nominal resistance are taken from the E24/E96 series for resistors with a tolerance of ±5%
& ±1%. The values of the E24/E96 series are in accordance with “IEC publication 60063”
Derating
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
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 WR02X(W)
Approval sheet
Page 5 of 7 ASC_WR02X_V15 Jan. - 2013
CATALOGUE NUMBERS
The resistors have a catalogue number starting with :
WR02 X 472_ J A L
Size code
WR02 : 0201
Type code
X : Normal
W : 1% For <10Ω and
>1MΩ
Resistance code
5%, E24: 2 significant digits
followed by no. of
zeros
100Ω = 101_
10KΩ = 103
1%, E24+E96: 3 significant
digits followed by no.
of zeros
100Ω =1000
37.4KΩ =3742
Tolerance
J : ±5%
F : ±1%
P : Jumper
Packaging code
A : 7” Reeled taping
(15Kpcs/Reel)
T : 7” Reeled taping
(10Kpcs/Reel)
D : 7” Reeled taping
(20Kpcs/Reel)
Termination code
L = Sn base (lead
free)
Approval sheet
Page 6 of 7 ASC_WR02X_V15 Jan. - 2013
TEST AND REQUIREMENTS (JIS C 5201-1 : 1998)
REQUIREMENT
TEST PROCEDURE / TEST METHOD Resistor 0Ω
ΩΩ
Ω
Electrical Characteristics
JISC5201-1: 1998
Clause 4.8
-
DC resistance values measurement
-
Temperature Coefficient of Resistance (T.C.R)
Natural resistance change per change in degree
centigrade.
( )
6
121
12 10×
−
−
ttR RR
(ppm/°C) t
1
: 20°C+5°C-1°C
R
1
: Resistance at reference temperature (20°C+5°C/-
1°C)
R
2
: Resistance at test temperature (-55°C or +125°C)
Within the specified tolerance
Refer to “QUICK
REFERENCE DATA”
<50mΩ
Short time overload
(S.T.O.L)
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.
∆R/R max. ±(2%+0.10Ω) <50mΩ
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 ΔR/R max. ±(1%+0.05Ω)
no visible damage <50mΩ
Solderability
Clause 4.17
Un-mounted chips completely immersed for 2±0.8second
in a SAC solder bath at 235℃±5℃ 95% coverage min., good tinning and no
visible damage
Temperature cycling
Clause 4.19
30 minutes at -55°C±3°C, 2~3 minutes at 20°C+5°C-1°C,
30 minutes at +125°C±3°C, 2~3 minutes at 20°C+5°C-
1°C, total 5 continuous cycles
∆R/R max. ±(1%+0.05Ω) < 50mΩ
Damp Heat
(Load life in humidity)
Clause 4.24
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
10Ω≤R<1MΩ :
∆R/R max. ±(3%+0.10Ω)
R<10Ω, R≥1MΩ :
∆R/R max. ±(5%+0.10Ω)
< 50mΩ
Load Life (Endurance)
Clause 4.25
1000+48/-0 hours; loaded with RCWV or V
max
in chamber
controller 70±2ºC, 1.5 hours on and 0.5 hours off Ditto.
Bending strength
Clause 4.33
Resistors mounted on a 90mm glass epoxy resin
PCB(FR4), bending once 5mm for 10sec.
No visual damaged,
∆R/R max. ±(1%+0.05Ω) < 50mΩ
Adhesion
Clause 4.32
Pressurizing force: 3N, Test time: 10±1sec. No remarkable damage or removal of the
terminations
Approval sheet
Page 7 of 7 ASC_WR02X_V15 Jan. - 2013
PACKAGING
Paper Tape specifications (unit :mm)
Series No. A B W F E
WR02X 0.67±0.05 0.37±0.05 8.00±0.20 3.50±0.05 1.75±0.10
Series No. P1 P0 ΦD T
WR02X 2.00±0.05 4.00±0.05
1.0 0.0
50.1
+
−
Φ
0.45±0.05
Reel dimensions
Symbol A B C D
(unit : mm) Φ180.0+0/-1.5
Φ60.0±1.0
Φ60.0+1/-0 13.0±0.2 9.0+1/-0
Taping quantity and Tape material
- Chip resistors 10,000 / 15,000 / 20,000 pcs/reel, Paper tape.
